CN102151787A - 600-DEG C high-temperature titanium alloy fired mold casting type shell surface painting and preparation method thereof - Google Patents
600-DEG C high-temperature titanium alloy fired mold casting type shell surface painting and preparation method thereof Download PDFInfo
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 65
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000005266 casting Methods 0.000 title abstract description 17
- 238000010422 painting Methods 0.000 title 1
- 239000011230 binding agent Substances 0.000 claims abstract description 67
- 239000000843 powder Substances 0.000 claims abstract description 66
- 238000005495 investment casting Methods 0.000 claims abstract description 38
- 239000000080 wetting agent Substances 0.000 claims abstract description 28
- 239000002270 dispersing agent Substances 0.000 claims abstract description 26
- 239000013530 defoamer Substances 0.000 claims abstract description 25
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 19
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 14
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 9
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- WRAGBEWQGHCDDU-UHFFFAOYSA-M C([O-])([O-])=O.[NH4+].[Zr+] Chemical compound C([O-])([O-])=O.[NH4+].[Zr+] WRAGBEWQGHCDDU-UHFFFAOYSA-M 0.000 claims abstract description 7
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000000292 calcium oxide Substances 0.000 claims abstract description 7
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052727 yttrium Inorganic materials 0.000 claims abstract description 7
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000006025 fining agent Substances 0.000 claims description 44
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 16
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 12
- 239000011812 mixed powder Substances 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000000576 coating method Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000002344 surface layer Substances 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 abstract 1
- 238000007670 refining Methods 0.000 abstract 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 abstract 1
- JINJMFAIGCWUDW-UHFFFAOYSA-L zirconium(2+);diacetate Chemical group [Zr+2].CC([O-])=O.CC([O-])=O JINJMFAIGCWUDW-UHFFFAOYSA-L 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 10
- 239000000956 alloy Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 9
- 239000013078 crystal Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 230000002929 anti-fatigue Effects 0.000 description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229910052863 mullite Inorganic materials 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- DUFCMRCMPHIFTR-UHFFFAOYSA-N 5-(dimethylsulfamoyl)-2-methylfuran-3-carboxylic acid Chemical compound CN(C)S(=O)(=O)C1=CC(C(O)=O)=C(C)O1 DUFCMRCMPHIFTR-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 229910017305 Mo—Si Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000013081 microcrystal Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
600℃高温钛合金熔模铸造型壳面层涂料及其制备方法，它涉及钛合金型壳的面层涂料及其制备方法。本发明解决了现有的用普通熔模铸造工艺制备的型壳在浇注高温钛合金时铸态组织粗大的技术问题。本发明的600℃高温钛合金熔模铸造型壳面层涂料由耐火粉料、粘结剂、润湿剂、消泡剂、分散剂和细化剂制成，其中耐火粉料为氧化铝、氧化锆、氧化钇或氧化钙，粘结剂为二醋酸锆、碳酸锆铵、硅溶胶或钇溶胶，细化剂为碳粉，硼粉和碳化硼粉中的一种或几种的组合。将细化剂与耐火粉混合后，与粘结剂一起再加入搅拌机中混合，最后加入润湿剂、消泡剂和分散剂混合即可。本发明型壳面层涂料能细化表层组织，可用于钛合金铸造领域。
The invention discloses a 600°C high-temperature titanium alloy investment casting mold shell surface coating and a preparation method thereof, which relates to a titanium alloy mold shell surface coating and a preparation method thereof. The invention solves the technical problem that the cast structure is coarse when the high-temperature titanium alloy is poured into the mold shell prepared by the common investment casting process. The 600°C high-temperature titanium alloy investment casting shell surface coating of the present invention is made of refractory powder, binder, wetting agent, defoamer, dispersant and refiner, wherein the refractory powder is alumina, Zirconia, yttrium oxide or calcium oxide, the binder is zirconium diacetate, ammonium zirconium carbonate, silica sol or yttrium sol, and the refining agent is one or a combination of carbon powder, boron powder and boron carbide powder. After mixing the refiner and refractory powder, add it to the mixer together with the binder and mix, and finally add the wetting agent, defoamer and dispersant to mix. The mold shell surface layer coating of the invention can refine the surface layer structure and can be used in the field of titanium alloy casting.
Description
Technical field
The present invention relates to investment precoat of titanium alloy shell and preparation method thereof.
Background technology
High-temperature titanium alloy is owing to specific strength height, good comprehensive performances such as corrosion-resistant, heat-resisting and structure high efficiency are widely used in aviation field, is used for making high important spare part and the aircraft body structure spare with good heat resistance of desired strength in the aero-engine more.Because high-temperature titanium alloy has higher serviceability temperature, elevated temperature strength, good oxidization resistance energy, creep-resistant property, anti-fatigue performance etc., in the used high-temperature structural material of new generation of aircraft engine and rocket propulsion system, enjoy the material supplier authors' of aerospace community attention, become one of the research direction of high-temperature structural material of new generation and development trend with remarkable advantages.At present, 600 ℃ of high-temperature titanium alloys of research mostly are the distortion high-temperature titanium alloys both at home and abroad, mostly are Ti-Al-Sn-Zr-Mo-Si system, and carry out the interpolation (as rare earth) of multielement on this basis, composition is diversification more, and this class alloy generally is to use with the form of ingot casting, forging stock, sheet material.Adopt full form casting process to have the characteristics of near-net-shape, technology is simple, and stock utilization height, production cost are low, are particularly suited for producing in batches and complex-shaped alloy part.Adopt the shell cast high-temperature titanium alloy of common full form casting process preparation, the cast back is because cooling is slow, foundry goods tends to form thick grain structure, influence the mechanical property of foundry goods, particularly high and low all fatigue and percentage elongation there is considerable influence, for improving the thick cast sturcture of titanium alloy, general employing interpolation grain refiner goes bad and handles or extraordinary heat-treating methods.But concerning the casting high-temperature titanium alloy of high-alloying, high alloying has suppressed the effect of alterant, and rotten processing is difficult to obtain effect, and adopts extraordinary heat treatment meeting to increase cost and production cycle greatly.As 600 ℃ of high-temperature titanium alloys with space flight and aviation application background, the refinement of as-cast structure, the particularly refinement of top layer as-cast structure have more the raising of its serviceability and have significant practical applications.
Summary of the invention
The present invention will solve the shell of the common full form casting process preparation of existing usefulness thick technical problem of as-cast structure when the cast high-temperature titanium alloy, and 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats and preparation method thereof are provided.
600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of the present invention are by refractory powder, binding agent, wetting agent, defoamer, dispersant and particle diameter are that the fining agent of 1 μ m～20 μ m is made, wherein the mass ratio of binding agent and refractory powder is 1: 1.6～4, the quality of wetting agent is 0.05%～0.5% of a binding agent quality, the quality of defoamer is 0.1%～0.6% of a binding agent quality, the quality of dispersant is 0.5%～3% of a binding agent quality, the quality of fining agent is 1%～20% of a refractory powder quality, refractory powder is an aluminium oxide, zirconia, yittrium oxide or calcium oxide, binding agent is two acetic acid zirconiums, zirconium carbonate ammonium, Ludox or yttrium colloidal sol, fining agent is a carbon dust, the combination of one or more in boron powder and the boron carbide powder.
The preparation method of 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of the present invention carries out according to the following steps: one, take by weighing refractory powder, binding agent, wetting agent, defoamer, dispersant and particle diameter are the fining agent of 1 μ m～20 μ m, wherein the mass ratio of binding agent and refractory powder is 1: 1.6～4, the quality of wetting agent is 0.05%～0.5% of a binding agent quality, the quality of defoamer is 0.1%～0.6% of a binding agent quality, the quality of dispersant is 0.5%～3% of a binding agent quality, the quality of fining agent is 1%～20% of a refractory powder quality, refractory powder is for being aluminium oxide, zirconia, yittrium oxide or calcium oxide, binding agent is two acetic acid zirconiums, zirconium carbonate ammonium, Ludox or yttrium colloidal sol, fining agent is a carbon dust, the combination of one or more in boron powder and the boron carbide powder; Two, the fining agent that step 1 is taken by weighing joins with refractory powder and mixes 3h～5h in the mixer, obtains mixed powder; Three, stir 3h～8h in the binding agent adding L type mould wash mixer that mixed powder that step 2 is prepared and step 1 take by weighing, and then the wetting agent that step 1 is taken by weighing, defoamer, dispersant add in the mould wash mixer, continue 12h～48h, obtain 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats.
600 ℃ of high-temperature titanium alloy investment casting shells of the present invention investment precoat adopts carbon dust, boron powder, boron carbide powder or wherein several combination are as fining agent, investment precoat flow cup viscosity is 20s～40s (4# Zhan Shi cup), when model casting, utilize the reaction between fining agent and melts of titanium alloy, separate out TiB or TiC at crystal boundary, thereby reach the effect of crystal grain thinning.Utilize the shell of this investment precoat preparation, behind the cast high-temperature titanium alloy, can refined cast structure, particularly textura epidermoidea, improved the intensity and the anti-fatigue performance of alloy.
600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of the present invention can be used for the Ti alloy casting field, can cast following several titanium alloy:
Ti-1100(Ti-6Al-2.75Sn-4Zr-0.4Mo-0.45Si)、
IMI834(Ti-5.8Al-4Sn-3.5Zr-0.7Nb-0.5M-0.135Si)、
BT36 (Ti-6.2A1-2Sn-3.6Zr-0.7Mo-0.1Y-5.0W-0.15Si) and
Ti60(Ti-5.8Al-4.8Sn-2.0Zr-1.0Mo-0.135Si-0.85Nd)。
Description of drawings
Fig. 1 is with the as-cast microstructure photo of the Ti-1100 high-temperature titanium alloy of common shell casting in the specific embodiment 33; It in Fig. 2 specific embodiment 33 as-cast microstructure photo with the Ti-1100 high-temperature titanium alloy of 600 ℃ of high-temperature titanium alloy investment casting shells castings of the specific embodiment 33 preparation.
The specific embodiment
The specific embodiment one: 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of present embodiment are by refractory powder, binding agent, wetting agent, defoamer, dispersant and particle diameter are that the fining agent of 1 μ m～20 μ m is made, wherein the mass ratio of binding agent and refractory powder is 1: 1.6～4, the quality of wetting agent is 0.05%～0.5% of a binding agent quality, the quality of defoamer is 0.1%～0.6% of a binding agent quality, the quality of dispersant is 0.5%～3% of a binding agent quality, the quality of fining agent is 1%～20% of a refractory powder quality, refractory powder is an aluminium oxide, zirconia, yittrium oxide or calcium oxide, binding agent is two acetic acid zirconiums, zirconium carbonate ammonium, Ludox or yttrium colloidal sol, fining agent is a carbon dust, the combination of one or more in boron powder and the boron carbide powder.
600 ℃ of high-temperature titanium alloy investment casting shells of present embodiment investment precoat adopts carbon dust, a kind of or wherein several combination in boron powder, the boron carbide powder is as fining agent, investment precoat flow cup viscosity is 20s～40s (4# Zhan Shi cup), when model casting, utilize the reaction between fining agent and melts of titanium alloy, separate out TiB or TiC at crystal boundary, thereby reach the effect of crystal grain thinning.Utilize the shell of this investment precoat preparation, behind the cast high-temperature titanium alloy, can refined cast structure, particularly textura epidermoidea, improved intensity, non-oxidizability and the anti-fatigue performance of alloy.
The specific embodiment two: what present embodiment and the specific embodiment one were different is: the particle diameter of fining agent is 3 μ m～17 μ m.Other is identical with the specific embodiment one.
The specific embodiment three: what present embodiment and the specific embodiment one were different is: the particle diameter of fining agent is 10 μ m.Other is identical with the specific embodiment one.
The specific embodiment four: what present embodiment was different with one of specific embodiment one to three is: the mass ratio of binding agent and refractory powder is 1: 1.8～3.5.Other is identical with one of specific embodiment one to three.
The specific embodiment five: what present embodiment was different with one of specific embodiment one to three is: the mass ratio of binding agent and refractory powder is 1: 2.5.Other is identical with one of specific embodiment one to three.
The specific embodiment six: what present embodiment was different with one of specific embodiment one to five is: the quality of wetting agent is 0.1%～0.4% of a binding agent quality.Other is identical with one of specific embodiment one to five.
The specific embodiment seven: what present embodiment was different with one of specific embodiment one to five is: the quality of wetting agent is 0.2% of a binding agent quality.Other is identical with one of specific embodiment one to five.
The specific embodiment eight: what present embodiment was different with one of specific embodiment one to seven is: the quality of defoamer is 0.2%～0.5% of a binding agent quality.Other is identical with one of specific embodiment one to seven.
The specific embodiment nine: what present embodiment was different with one of specific embodiment one to seven is: the quality of defoamer is 0.3% of a binding agent quality.Other is identical with one of specific embodiment one to seven.
The specific embodiment ten: what present embodiment was different with one of specific embodiment one to nine is: the quality of dispersant is 0.8%～2.8% of a binding agent quality.Other is identical with one of specific embodiment one to nine.
The specific embodiment 11: what present embodiment was different with one of specific embodiment one to nine is: the quality of dispersant is 2.0% of a binding agent quality.Other is identical with one of specific embodiment one to nine.
The specific embodiment 12: what present embodiment was different with one of specific embodiment one to 11 is: the quality of fining agent is 3%～18% of a refractory powder quality.Other is identical with one of specific embodiment one to 11.
When fining agent was composition in the present embodiment, various fining agents were pressed arbitrarily than combination.
The specific embodiment 13: what present embodiment was different with one of specific embodiment one to 11 is: the quality of fining agent is 10% of a refractory powder quality.Other is identical with one of specific embodiment one to 11.
When fining agent was composition in the present embodiment, various fining agents were pressed arbitrarily than combination.
The specific embodiment 14: the preparation method of 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of present embodiment carries out according to the following steps: one, take by weighing refractory powder, binding agent, wetting agent, defoamer, dispersant and particle diameter are the fining agent of 1 μ m～20 μ m, wherein the mass ratio of binding agent and refractory powder is 1: 1.6～4, the quality of wetting agent is 0.05%～0.5% of a binding agent quality, the quality of defoamer is 0.1%～0.6% of a binding agent quality, the quality of dispersant is 0.5%～3% of a binding agent quality, the quality of fining agent is 1%～20% of a refractory powder quality, refractory powder is for being aluminium oxide, zirconia, yittrium oxide or calcium oxide, binding agent is two acetic acid zirconiums, zirconium carbonate ammonium, Ludox or yttrium colloidal sol, fining agent is a carbon dust, the combination of one or more in boron powder and the boron carbide powder; Two, the fining agent that step 1 is taken by weighing joins with refractory powder and mixes 3h～5h in the mixer, obtains mixed powder; Three, stir 3h～8h in the binding agent adding L type mould wash mixer that mixed powder that step 2 is prepared and step 1 take by weighing, and then the wetting agent that step 1 is taken by weighing, defoamer, dispersant add in the mould wash mixer, continue to stir 12h～48h, obtain 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats.
L type mould wash mixer in the present embodiment is the commercial goods.
600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of present embodiment adopt carbon dust, boron powder, B
4A kind of or wherein several combination in the C powder is as fining agent, investment precoat flow cup viscosity is 20s～40s (4# Zhan Shi cup), when model casting, utilizes the reaction between fining agent and melts of titanium alloy, separate out TiB or TiC at crystal boundary, thereby reach the effect of crystal grain thinning.Utilize the shell of this investment precoat preparation, behind the cast high-temperature titanium alloy, can refined cast structure, particularly textura epidermoidea, improved intensity, non-oxidizability and the anti-fatigue performance of alloy.
The specific embodiment 15: what present embodiment and the specific embodiment 14 were different is: the particle diameter of fining agent is 3 μ m～17 μ m in the step 1.Other is identical with the specific embodiment 14.
The specific embodiment 16: what present embodiment and the specific embodiment 14 were different is: the particle diameter of fining agent is 10 μ m in the step 1.Other is identical with the specific embodiment 14.
The specific embodiment 17: what present embodiment was different with one of specific embodiment 14 to 16 is: the mass ratio of binding agent and refractory powder is 1: 1.8～3.5 in the step 1.Other is identical with one of specific embodiment 14 to 16.
The specific embodiment 18: what present embodiment was different with one of specific embodiment 14 to 16 is: the mass ratio of binding agent and refractory powder is 1: 2.5 in the step 1.Other is identical with one of specific embodiment 14 to 16.
The specific embodiment 19: what present embodiment was different with one of specific embodiment 14 to 18 is: the quality of wetting agent is 0.1%～0.4% of a binding agent quality in the step 1.Other is identical with one of specific embodiment 14 to 18.
The specific embodiment 20: what present embodiment was different with one of specific embodiment 14 to 18 is: the quality of wetting agent is 0.2% of a binding agent quality in the step 1.Other is identical with one of specific embodiment 14 to 18.
The specific embodiment 21: what present embodiment was different with one of specific embodiment 14 to 20 is: the quality of defoamer is 0.2%～0.5% of a binding agent quality in the step 1.Other is identical with one of specific embodiment 14 to 20.
The specific embodiment 22: what present embodiment was different with one of specific embodiment 14 to 20 is: the quality of defoamer is 0.3% of a binding agent quality in the step 1.Other is identical with one of specific embodiment 14 to 20.
The specific embodiment 23: what present embodiment was different with one of specific embodiment 14 to 22 is: the quality of dispersant is 0.8%～2.8% of a binding agent quality in the step 1.Other is identical with one of specific embodiment 14 to 22.
The specific embodiment 24: what present embodiment was different with one of specific embodiment 14 to 22 is: the quality of dispersant is 2.0% of a binding agent quality in the step 1.Other is identical with one of specific embodiment 14 to 22.
The specific embodiment 25: what present embodiment was different with one of specific embodiment 14 to 24 is: the quality of fining agent is 3%～18% of a refractory powder quality.Other is identical with one of specific embodiment 14 to 24.
The specific embodiment 26: what present embodiment was different with one of specific embodiment 14 to 24 is: the quality of fining agent is 10% of a refractory powder quality in the step 1.Other is identical with one of specific embodiment 14 to 24.
The specific embodiment 27: what present embodiment was different with one of specific embodiment 14 to 26 is: in the step 2 fining agent and refractory powder joined and mix 3.5h～4.5h in the mixer.Other is identical with one of specific embodiment 14 to 26.
The specific embodiment 28: what present embodiment was different with one of specific embodiment 14 to 26 is: in the step 2 fining agent and refractory powder joined and mix 4.0h in the mixer.Other is identical with one of specific embodiment 14 to 26.
The specific embodiment 29: what present embodiment was different with one of specific embodiment 14 to 28 is: in the step 3 mixed powder and binding agent added that mixing time is 4h～7h in the L type mould wash mixer.Other is identical with one of specific embodiment 14 to 28.
The specific embodiment 30: what present embodiment was different with one of specific embodiment 14 to 28 is: in the step 3 mixed powder and binding agent added that mixing time is 5h in the L type mould wash mixer.Other is identical with one of specific embodiment 14 to 28.
The specific embodiment 31: what present embodiment was different with one of specific embodiment 14 to 28 is: in the step 3 wetting agent, defoamer, dispersant are added in the mould wash mixer, continue to stir 13h～45h.Other is identical with one of specific embodiment 14 to 28.
The specific embodiment 32: what present embodiment was different with one of specific embodiment 14 to 28 is: in the step 3 wetting agent, defoamer, dispersant are added in the mould wash mixer, continue to stir 20h.Other is identical with one of specific embodiment 14 to 28.
The specific embodiment 33: the preparation method of the investment precoat of 600 ℃ of high-temperature titanium alloy shells of a kind of model casting of present embodiment carries out according to the following steps: one, taking by weighing the wetting agent jfc of 325 order 1500g yittrium oxide powder, 500g two Zirconium acetate agglutinate agent, 1.5g, the n-octyl alcohol defoamer of 1.5g, triethanolamine dispersant and the 150g particle diameter of 5g is the B of 5 μ m
4The C powder; Two, the B that step 1 is taken by weighing
4The C powder joins with the yittrium oxide powder and mixes 3h in the mixer, obtains mixed powder; Three, stir 5h in the two Zirconium acetate agglutinate agent adding L type mould wash mixer that mixed powder that step 2 is prepared and step 1 take by weighing, and then the wetting agent jfc that step 1 is taken by weighing, n-octyl alcohol and triethanolamine add in the mixer, continue to stir 36 hours, obtain 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats.
Wetting agent jfc is the commercial goods in the present embodiment.The flow cup viscosity of 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of present embodiment preparation is 35s (4# Zhan Shi cup).
The method that 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats that prepare with present embodiment prepare investment casting shell is carried out according to the following steps: one, wax-pattern is immersed in 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of present embodiment preparation, the wax-pattern surface slurry that hangs up properly is even until being coated with, wax-pattern is proposed, adopt the sand mode that adds of the formula that drenches with rain to spread 120 order zirconias then, be that 24 ℃, relative humidity are under 60% the condition dry 9 hours in temperature then, obtain preparing the shell of surface layer; Two, be refractory powder with 200 purpose mullite powder, with the Ludox is binding agent, the mass ratio that adopts refractory powder and Ludox is 1.8: 1 preparation transition zone coating, the shell that then step 1 is prepared surface layer is immersed in the transition zone coating is stained with slurry, be coated with hang evenly after, spreading 60 order mullite sand, is that 24 ℃, relative humidity are under 50% the condition dry 12 hours in temperature then, obtains preparing the shell of transition zone; Three, be refractory powder with 200 purpose mullite powder, with the Ludox is binding agent, the mass ratio that adopts water-fast powder and Ludox is 1.5: 1 preparation backing layer slurries, the shell that then step 2 is prepared transition zone is immersed in the backing layer slurry is stained with slurry, then spreading 20 order mullite sand, is that 24 ℃, relative humidity are under 50% the condition dry 15 hours in temperature then; And then the identical operations condition repeats hanging, stucco and drying, and triplicate obtains preparing the shell of backing layer; Four, be refractory powder with 200 purpose mullite powder, with the Ludox is binding agent, the mass ratio that adopts refractory powder and Ludox is 1.3: 1 preparation envelope slurry coatings, the shell that then step 3 is prepared backing layer is immersed in hanging in the transition zone coating, be coated with and hang evenly back proposition, obtain preparing the shell of envelope slurry layer; Five, will seal shell behind the slurry, dry 24 hours, put into steam dewaxing still then, be to dewax the shell after obtaining dewaxing under the condition of 0.8MPa at steam pressure; Six, the shell after will dewaxing is placed in the vacuum sintering furnace, is roasting 2 hours under 1000 ℃ the condition for 0.095MPa, temperature at true degree, obtains 600 ℃ of high-temperature titanium alloy investment casting shells.
With 600 ℃ of high-temperature titanium alloy investment casting shells of common shell and present embodiment preparation under identical condition, with cast Ti-6Al-2.75Sn-4Zr-0.4Mo-0.45Si titanium alloy (being the Ti-1100 high-temperature titanium alloy) in the centrifugal titanium casting machine, with the as-cast microstructure photo of the Ti-1100 high-temperature titanium alloy of common shell casting as shown in Figure 1, as-cast microstructure photo such as Fig. 2 with the Ti-1100 high-temperature titanium alloy of 600 ℃ of high-temperature titanium alloy investment casting shells castings of present embodiment preparation, as can be seen from Figure 1, the crystallite dimension with the alloy of common shell cast is about 500 μ m.The crystal grain on surface does not have the existence of refinement layer with inner consistent.As can be seen from Figure 2, and the average grain size of the alloy that obtains with the cast of 600 ℃ of high-temperature titanium alloy investment casting shells is about 300 μ m, and exist a thickness on the surface (left side of Fig. 2) of alloy and be the refinement layer about 150 μ m, size of microcrystal is about 50 μ m.
From Fig. 1 and Fig. 2 more as can be seen, the alloy that obtains with the shell of the investment precoat of present embodiment preparation, as-cast structure obtains refinement, textura epidermoidea particularly, adopt the shell surface of this method preparation to exist a tangible grain refinement layer, can improve the intensity and the anti-fatigue performance of alloy.
Claims (10)
1.600 ℃ high-temperature titanium alloy investment casting shell investment precoat, it is characterized in that 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats are by refractory powder, binding agent, wetting agent, defoamer, dispersant and particle diameter are that the fining agent of 1 μ m～20 μ m is made, wherein the mass ratio of binding agent and refractory powder is 1: 1.6～4, the quality of wetting agent is 0.05%～0.5% of a binding agent quality, the quality of defoamer is 0.1%～0.6% of a binding agent quality, the quality of dispersant is 0.5%～3% of a binding agent quality, the quality of fining agent is 1%～20% of a refractory powder quality, refractory powder is an aluminium oxide, zirconia, yittrium oxide or calcium oxide, binding agent is two acetic acid zirconiums, zirconium carbonate ammonium, Ludox or yttrium colloidal sol, fining agent is a carbon dust, the combination of one or more in boron powder and the boron carbide powder.
2. 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats according to claim 1, the particle diameter that it is characterized in that fining agent are 3 μ m～17 μ m.
3. 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats according to claim 1 and 2, the mass ratio that it is characterized in that binding agent and refractory powder is 1: 1.8～3.5.
4. 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats according to claim 1 and 2, the quality that it is characterized in that wetting agent is 0.1%～0.4% of a binding agent quality.
5. 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats according to claim 1 and 2, the quality that it is characterized in that dispersant is 0.8%～2.8% of a binding agent quality.
6. 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats according to claim 1 and 2, the quality that it is characterized in that fining agent is 3%～18% of a refractory powder quality.
7. the method for preparing the described 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats of claim 1, it is characterized in that the method for preparing 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats carries out according to the following steps: one, take by weighing refractory powder, binding agent, wetting agent, defoamer, dispersant and particle diameter are the fining agent of 1 μ m～20 μ m, wherein the mass ratio of binding agent and refractory powder is 1: 1.6～4, the quality of wetting agent is 0.05%～0.5% of a binding agent quality, the quality of defoamer is 0.1%～0.6% of a binding agent quality, the quality of dispersant is 0.5%～3% of a binding agent quality, the quality of fining agent is 1%～20% of a refractory powder quality, refractory powder is for being aluminium oxide, zirconia, yittrium oxide or calcium oxide, binding agent is two acetic acid zirconiums, zirconium carbonate ammonium, Ludox or yttrium colloidal sol, fining agent is a carbon dust, the combination of one or more in boron powder and the boron carbide powder; Two, the fining agent that step 1 is taken by weighing joins with refractory powder and mixes 3h～5h in the mixer, obtains mixed powder; Three, stir 3h～8h in the binding agent adding L type mould wash mixer that mixed powder that step 2 is prepared and step 1 take by weighing, and then the wetting agent that step 1 is taken by weighing, defoamer, dispersant add in the mould wash mixer, continue 12h～48h, obtain 600 ℃ of high-temperature titanium alloy investment casting shell investment precoats.
8. the method for 600 ℃ of high-temperature titanium alloy investment casting shells of preparation according to claim 7 investment precoat is characterized in that in the step 2 fining agent and refractory powder joined and mixes 3.5h～4.5h in the mixer.
9. according to the method for claim 7 or 600 ℃ of high-temperature titanium alloy investment casting shells of 8 described preparations investment precoat, it is characterized in that in the step 3 mixed powder and binding agent added that mixing time is 4h～7h in the L type mould wash mixer.
10. according to the method for claim 7 or 600 ℃ of high-temperature titanium alloy investment casting shells of 8 described preparations investment precoat, it is characterized in that in the step 3 wetting agent, defoamer, dispersant being added in the mould wash mixer, continue to stir 13h～45h.
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