CN104862645A - Titanium-nickel alloy aluminizing method - Google Patents
Titanium-nickel alloy aluminizing method Download PDFInfo
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- CN104862645A CN104862645A CN201510236399.8A CN201510236399A CN104862645A CN 104862645 A CN104862645 A CN 104862645A CN 201510236399 A CN201510236399 A CN 201510236399A CN 104862645 A CN104862645 A CN 104862645A
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Abstract
The invention discloses a titanium-nickel alloy aluminizing method. The method includes the following steps that TiNi alloy base materials are cut, the surfaces of the alloy base materials are polished, oxidation layers are removed, thenthe alloy base materials are put into an organic solvent to be ultrasonically cleaned, surface oil stains are removed, and the alloy base materials are dried to serve as samples for standby use; an aluminizing agent is prepared; a layer of the newly-prepared aluminizing agent is laid in a steel tank and tamped, then a layer of the samples are laid on the newly-prepared aluminizing agent, the newly-prepared aluminizing agent and the samples are laid compactly at intervals till two thirds of the steel tank is filled, the steel tank is filled with the recycled aluminizing agent till the aluminizing agent reaches the position 5 mm away from a steel tank opening, fire-proof cotton is laid until the space to the tank opening in the steel tank is filled, a cover is arranged to be screwed, an iron wire is used for firmly bundling the steel tank, and the steel tank is vertically arranged; the packaged steel tank is vertically put into a crucible furnace and is heated for aluminizing, and aluminized titanium-nickel alloy is obtained. By means of the titanium-nickel alloy aluminizing method, the TiNi alloy is aluminized through a solid powder method, equipment is simple, operation is easy, the oxidation resistance capability of the TiNi alloy can be obviously improved, the TiNi alloy can be prevented from reacting with oxygen in the hot working or annealing process, and all the properties of the alloy are ensured.
Description
Technical field
The invention belongs to technical field of material chemistry, be specifically related to a kind of Ti-Ni alloy aluminizing method.
Background technology
TiNi shape memory alloy has excellent shape memory effect, super-elasticity and good mechanical property, is all widely used in biomedicine, machinery, electronics and daily life.TiNi shape memory alloy has good hot workability, can carry out the technological processs such as forge hot, hot extrusion, hot rolling, and obtain the needs to meet various uses such as the plate of all size, band, silk, the hot processing temperature of TiNi alloy is 700-850 DEG C.TiNi alloy also can carry out cold rolling or drawing deformation, but the work hardening produced when being often out of shape 10% anneal just needing to carry out 700-850 DEG C to eliminate cold deformation.Therefore be that TiNi alloy is all inevitable when heating and oxygen generation oxidizing reaction when carrying out hot-work or cold deformation.Oxygen has a significant impact TiNi alloy tool, not only makes the transformation temperature of TiNi alloy reduce, and more seriously reduces the mechanical property of its memory performance and deterioration material, affects the normal use of material.
Aluminising is the chemical heat treatment process that one or more atoms metals infiltrate in metal works top layer.Metal works is placed on containing infiltrating in the penetration enhancer of metallic element, be heated to certain temperature, after keeping appropriate time, the active atomic of the infiltration metallic element that penetration enhancer thermolysis produces just is adsorbed to workpiece surface, and diffuse into workpiece surface, thus change chemical composition, the structure and properties of workpiece surface.With ooze nonmetallic phase ratio, the atomic radius of metallic element is large, and not easily infiltrate, infiltration layer is shallow, generally must spread at relatively high temperatures.The compound formed after metallic element infiltrates or passive film, have higher oxidation-resistance property and resistance to corrosion, can adapt to different surrounding mediums respectively.
After the alloy aluminising such as iron and steel and Ni-based, cobalt-based, oxidation-resistance property can be improved, improve the resistance to corrosion in the high-temperature fuel gas medium of hydrogen sulfide, sulfur-bearing and vanadium oxide.In order to improve the surface property of copper alloy and titanium alloy, sometimes also adopt alumetizing process.
The method of aluminising is a lot.Carry out the method for thermodiffusion after mainly adopting hot dipping, electrostatic spraying or electrophoretic deposition in metallurgical industry again, produce alumetized steel sheet, steel pipe, steel wire etc. in a large number.After electrostatic spraying or electrophoretic deposition, have to pass through calendering or the rolling of small deformation amount, after making the aluminium lamination of attachment closely knit, carry out diffusion annealing again.Hot aluminizing can be bathed with fine aluminium, but more generally in aluminium bath, adds a small amount of zinc, molybdenum, manganese, silicon, and temperature generally maintains about 670 DEG C, and the time is 10 ~ 25 minutes.Most widely used in mechanical industry is powder vanning method, and penetration enhancer is primarily of ferroaluminium (or fine aluminium, aluminum oxide) filler and ammonium chloride catalyzer composition.
Summary of the invention
An object of the present invention is to provide a kind of Ti-Ni alloy aluminizing method, improves the high temperature resistance resistance of oxidation of Ti-Ni alloy, improves corrosion resistance.
The invention provides a kind of Ti-Ni alloy aluminizing method, comprise the following steps:
Cutting TiNi alloy base material, described TiNi alloy substrate surface of polishing, removing surface oxide layer, is then placed in organic solvent for ultrasonic cleaning, removes surface and oil contaminant, dry, stand-by as sample;
Preparation aluminizing medium;
Newly aluminizing medium is joined described in cylinder of steel middle berth one deck, tamping, one deck sample that aluminizing medium tiles newly is joined again described, described aluminizing medium and the sample interval of newly joining spreads real, until fill up cylinder of steel 2/3, then fills cylinder of steel to tool cylinder of steel mouth 5mm place with the aluminizing medium reclaimed, spread resistance to guncotton and be filled to tank mouth, add a cover and tighten, solid with iron wire binding, vertically place;
Packaged cylinder of steel is vertically put into crucible oven, and heating aluminising, obtains the Ti-Ni alloy after aluminising.
Further, described heating aluminising is 600-800 DEG C, is incubated 5 hours, furnace cooling with stove.
Further, described aluminizing medium comprises Al, Al
2o
3and NH
4cl, mass ratio is 15:4:1.
Further, described polishing TiNi alloy surface is for using 400-800
#sand papering.
Further, described in be placed in organic solvent for ultrasonic scavenging period be 5-10min, ultrasonic frequency 100Hz, described organic solvent comprises dehydrated alcohol and acetone.
Further, described crucible oven is atmosphere protection stove or vacuum oven.
Beneficial effect of the present invention is: Ti-Ni alloy aluminizing method of the present invention, by solid powder method, aluminising process is carried out to TiNi alloy, equipment is simple, easy operation, the resistance of oxidation of TiNi alloy can be significantly improved, TiNi alloy is not reacted with oxygen in hot-work or annealing, and this is all necessary to the various performances of guarantee alloy.
Accompanying drawing explanation
Figure 1 shows that the X diffraction curve of the embodiment aluminising TiNi alloy of Ti-Ni alloy aluminizing method of the present invention;
Figure 2 shows that the microstructure in embodiment of the present invention aluminising TiNi alloy aluminized coating cross section and corresponding power spectrum line sweep figure;
Figure 3 shows that embodiment of the present invention TiNi alloy base material zone of oxidation microsturcture and corresponding power spectrum line sweep figure;
Figure 4 shows that the X-ray diffractogram of the zone of oxidation after the oxidation of embodiment of the present invention TiNi alloy base material;
Figure 5 shows that the cross section microstructure after embodiment of the present invention aluminising TiNi alloy constant temperature oxidation and corresponding power spectrum line sweep figure;
Figure 6 shows that the X-ray diffractogram after embodiment of the present invention aluminising TiNi alloy constant temperature oxidation;
Figure 7 shows that the constant temperature oxidation kinetic curve before and after the aluminising of embodiment of the present invention aluminising TiNi alloy.
Embodiment
Hereafter will describe the specific embodiment of the invention in detail in conjunction with concrete accompanying drawing.It should be noted that the combination of technical characteristic or the technical characteristic described in following embodiment should not be considered to isolated, they can mutually be combined thus be reached better technique effect.
Base material pre-treatment: this experiment is base materials employed is TiNi binary alloy, polishes surperficial oxide film until expose metalluster with sharpening machine, is then cut into the small sample of 8mm × 8mm × 2.2mm with wire electric discharge.There is cut channel in various degree Linear cut rear surface, very important impact can be produced on aluminising, so polish specimen surface with No. 800 waterproof abrasive papers, in acetone (or dehydrated alcohol), then use 100Hz ultrasonic cleaning specimen surface greasy dirt, time 10min, dries stand-by sample.
Configuration aluminizing medium: by pure aluminium powder, Al
2o
3powder and NH
4cl powder is 15:4:1 proportioning in mass ratio, mixes preparation aluminizing medium, and the aluminizing medium after each test can reuse.Bottom or the container top of container can be layered on next time when using.
The encapsulation of aluminising cylinder of steel: that first spreads suitable thickness in the bottom of cylinder of steel newly joins aluminizing medium, with instrument by aluminizing medium tamping, then tile one deck sample, then repeats above-mentioned steps, aluminizing medium and sample are adopted the alternate order stacked layer by layer to place.Treat that aluminizing medium and the TiNi alloy for seep of new configuration are all filled to about dark 2/3 place of tank in tank, the residue 1/3 height aluminizing medium that last time is remaining is filled until apart from tank mouth 5mm place, this be not only conducive to improving aluminising effect but also can recycle, save medicine, most last layer is spread resistance to guncotton and is about 5mm, then add a cover and tighten, finally solid with iron wire binding, vertically place.
Heating aluminising: iron flask is vertically put into crucible oven or resistance furnace; (stove can have atmosphere protection or vacuum; not also can) heating crucible stove to 700 DEG C (general temperature is within the scope of 600-800 DEG C) time start timing; be incubated after 5 hours; furnace cooling, takes out iron flask.The aluminizing medium material that fully sintered one-tenth is hard of most last layer second stage employ, new configuration aluminizing medium is still pulverulence.Take out sample, with the naked eye namely can be observed specimen surface and become coarse silvery white from the metallic luster of original gloss, use ultrasonic cleaning specimen surface, remove the penetration enhancer of attachment.
Figure 1 shows that the X diffraction curve of the embodiment aluminising TiNi alloy of Ti-Ni alloy aluminizing method of the present invention.Research show TiNi alloy ooze Al after aluminized coating by TiAl
3and Ni
2al
3two phase composites.
Figure 2 shows that the microstructure in embodiment of the present invention aluminising TiNi alloy aluminized coating cross section and corresponding power spectrum line sweep figure.As can be seen from this figure, aluminized coating thickness is about 100 microns, and from the outer ecto-entad of sample, aluminized coating is divided into significantly two-layer, and Momentum profiles line sweep is known, and I layer is TiAl
3layer, II layer is Ni
2al
3layer.
Figure 3 shows that embodiment of the present invention TiNi alloy base material zone of oxidation microsturcture and corresponding power spectrum line sweep figure; Figure 4 shows that the X-ray diffractogram of the zone of oxidation after the oxidation of embodiment of the present invention TiNi alloy base material.Be oxidized between rear oxidation layer and matrix by the known TiNi alloy of X ray picture and there is a transition layer, zone of oxidation is also divided into two-layer from outside to inside, and its mesectoderm is finer and close, and internal layer is more loose.Higher relative to internal layer by the outer content of power spectrum linescan known Ti element in zone of oxidation, and the content of Ni element in internal layer is than outer floor height, so the skin mainly oxide compound that formed of Ti and O, internal layer is the oxide compound of Ni and O formation.Know that zone of oxidation is primarily of TiO by the X-ray diffractogram of Fig. 4
2and NiTiO
3phase composite.
Figure 5 shows that the cross section microstructure after embodiment of the present invention aluminising TiNi alloy constant temperature oxidation and corresponding power spectrum line sweep figure.Under the condition that oxidization time is all identical with oxidizing temperature, the TiNi alloy of the more non-aluminising of zone of oxidation of the TiNi alloy of aluminising process is much thin, be about the 1/4 thick of non-aluminising, and oxide film is dense.
Figure 6 shows that the X-ray diffractogram after embodiment of the present invention aluminising TiNi alloy constant temperature oxidation.Know that the TiNi alloy zone of oxidation of aluminising process is by Al by this figure
2o
3and TiO
2phase composite.
Figure 7 shows that the constant temperature oxidation kinetic curve before and after the aluminising of embodiment of the present invention aluminising TiNi alloy.This figure shows that aluminising process significantly improves the high temperature oxidation resistance of TiNi alloy, and the resistance of oxidation of the TiNi alloy of aluminising process improves nearly 2 times than the TiNi alloy of non-aluminising.
Ti-Ni alloy aluminizing method of the present invention, by solid powder method, aluminising process is carried out to TiNi alloy, equipment is simple, easy operation, the resistance of oxidation of TiNi alloy can be significantly improved, TiNi alloy is not reacted with oxygen in hot-work or annealing, and this is all necessary to the various performances of guarantee alloy.
Although give some embodiments of the present invention, it will be understood by those of skill in the art that without departing from the spirit of the invention herein, can change embodiment herein.Above-described embodiment is exemplary, should using embodiment herein as the restriction of interest field of the present invention.
Claims (6)
1. a Ti-Ni alloy aluminizing method, is characterized in that, comprises the following steps:
Cutting TiNi alloy base material, described TiNi alloy substrate surface of polishing, removing surface oxide layer, is then placed in organic solvent for ultrasonic cleaning, removes surface and oil contaminant, dry, stand-by as sample;
Preparation aluminizing medium;
Newly aluminizing medium is joined described in cylinder of steel middle berth one deck, tamping, one deck sample that aluminizing medium tiles newly is joined again described, described aluminizing medium and the sample interval of newly joining spreads real, until fill up cylinder of steel 2/3, then fills cylinder of steel to tool cylinder of steel mouth 5mm place with the aluminizing medium reclaimed, spread resistance to guncotton and be filled to tank mouth, add a cover and tighten, solid with iron wire binding, vertically place;
Packaged cylinder of steel is vertically put into crucible oven, and heating aluminising, obtains the Ti-Ni alloy after aluminising.
2. Ti-Ni alloy aluminizing method as claimed in claim 1, it is characterized in that, described heating aluminising is 600-800 DEG C, is incubated 5 hours, furnace cooling with stove.
3. the Ti-Ni alloy aluminizing method as described in any one of claim 1 or 2, it is characterized in that, described aluminizing medium comprises Al, Al
2o
3and NH
4cl, mass ratio is 15:4:1.
4. Ti-Ni alloy aluminizing method as claimed in claim 3, is characterized in that, described polishing TiNi alloy surface is for using 400-800
#sand papering.
5. the Ti-Ni alloy aluminizing method as described in any one of claim 1,2 or 4, is characterized in that, described in be placed in the organic solution ultrasonic cleaning time be 5-10min, ultrasonic frequency 100Hz, organic solvent comprises dehydrated alcohol and acetone.
6. Ti-Ni alloy aluminizing method as claimed in claim 5, it is characterized in that, described crucible oven is atmosphere protection stove or vacuum oven.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105734486A (en) * | 2016-03-09 | 2016-07-06 | 武汉大学 | Preparation method for liquid aluminizing composite coating on surface of titanium alloy |
CN109023438A (en) * | 2018-08-11 | 2018-12-18 | 苏州忍冬新材料科技有限公司 | A kind of method that two-step method prepares nickel aluminium coating |
CN117309543A (en) * | 2023-10-10 | 2023-12-29 | 鞍钢股份有限公司 | Iron-based powder oxygen content detection method |
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CN104404444A (en) * | 2014-11-05 | 2015-03-11 | 西安航空动力股份有限公司 | Alumina powder for solid aluminizing agent, processing method thereof, and aluminizing technology using aluminizing agent of alumina powder |
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2015
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Patent Citations (1)
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CN104404444A (en) * | 2014-11-05 | 2015-03-11 | 西安航空动力股份有限公司 | Alumina powder for solid aluminizing agent, processing method thereof, and aluminizing technology using aluminizing agent of alumina powder |
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H.R.KARIMI ZARCHI ET.AL.: "Thermodynamic study on pack aluminizing systems of pure titanium and nickel", 《TRANS. NONFERROUS MET.SOC.CHINA》 * |
LU TONG ET. AL.: "Low-temperature Formation of Aluminide Coatings on Ni-base Superalloys by Pack Cementation Process", 《CHINESE JOURNAL OF AERONAUTICS》 * |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105734486A (en) * | 2016-03-09 | 2016-07-06 | 武汉大学 | Preparation method for liquid aluminizing composite coating on surface of titanium alloy |
CN105734486B (en) * | 2016-03-09 | 2018-05-29 | 武汉大学 | A kind of titanium alloy surface liquid expands the preparation method of aluminising composite coating |
CN109023438A (en) * | 2018-08-11 | 2018-12-18 | 苏州忍冬新材料科技有限公司 | A kind of method that two-step method prepares nickel aluminium coating |
CN117309543A (en) * | 2023-10-10 | 2023-12-29 | 鞍钢股份有限公司 | Iron-based powder oxygen content detection method |
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Application publication date: 20150826 |