CN105154700A - Heavy-density tungsten alloy - Google Patents
Heavy-density tungsten alloy Download PDFInfo
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- CN105154700A CN105154700A CN201510618742.5A CN201510618742A CN105154700A CN 105154700 A CN105154700 A CN 105154700A CN 201510618742 A CN201510618742 A CN 201510618742A CN 105154700 A CN105154700 A CN 105154700A
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Abstract
The invention provides a sintering process for a heavy-density tungsten alloy. The process comprises the following steps: batching: providing granular tungsten alloy feedstock; forming: injecting the tungsten alloy feedstock into a mold to form a tungsten alloy green body; solvent degreasing: placing the tungsten alloy green body in a water bath for solvent degreasing; atmosphere hot degreasing: performing atmosphere hot degreasing of the tungsten alloy green body subjected to solvent degreasing; and atmosphere sintering: performing atmosphere sintering of the tungsten alloy green body subjected to hot degreasing, and performing cooling to obtain the heavy-density tungsten alloy. The heavy-density tungsten alloy sintered according to the sintering process provided by the invention has high density, high hardness, no magnetism, low sintering temperature, low thermal expansion coefficient and the like, can meet the requirements for high temperature, high humidity, salt fog and the like, and has physical, chemical and mechanical properties approximate to those of forge pieces.
Description
[technical field]
The invention belongs to powder metallurgical technology, be specifically related to a kind of sintering process of high-specific gravity tungsten alloy.
[background technology]
To be that collection plastics molding process, polymer chemistry, powder metallurgy technology and Metal Material Science etc. are multidisciplinary interpenetrate and the product intersected Metal Injection Molding (MIM), utilize mould injection moldable blank and pass through the structural parts that sintering manufactures high-density, high precision, three-dimensional complex shapes fast, fast and accurately design philosophy can be turned materially have a fixed structure, functional performance goods and directly can mass-produce part, be the change that manufacturing technology industry is once new.This Technology not only has the advantages such as conventional powder metallurgical technique process is few, nothing is cut or cut less, economic benefit is high, and overcome that prior powder metallurgy handicraft density is low, material is uneven, mechanical property is low, the shortcoming of not easily forming thin-walled, complex construction, be particularly suitable for producing in enormous quantities small-sized, complicated and there is the metal parts of particular requirement.Through the effort of more than 20 years, current MIM became the near net shape technology of the most future that international field of powder metallurgy develops rapidly, was described as one of " international the most popular metallic element forming technique ".The production of feeding (metal feedstock, ceramic feeding) is the indispensable integral part of metal injection moulding industry, because injection technique technical requirements injection raw material is necessary for a certain size single-size feeding, and directly can not use powder, the more important thing is that feeding composition must be stablized and ensure sintered products dimensional stabilizing, therefore, the feeding technology developed for demand performance is very necessary and most important to whole industry.
The electronicss such as existing vibrating motor, gyrostat all need to use mass to be carried out counterweight or makes oscillator, at this moment all need that this mass density is high, nonmagnetic, thermal expansivity is low, easy heat conduction, the multiple requirement such as can also to weld with the solder such as copper, silver, but the produced mass of existing material cannot meet the increasing various requirement of mass.
[summary of the invention]
The invention provides a kind of sintering process of high-specific gravity tungsten alloy, its tungstenalloy sintering out can solve the produced mass of traditional material cannot meet technical problem to the increasing various requirement of mass.
For solving the problems of the technologies described above, the invention provides a kind of sintering process of high-specific gravity tungsten alloy, this technique comprises the following steps: batching: provide granular tungstenalloy feeding, this tungstenalloy feeding is mixed by high-specific gravity tungsten alloy powder and caking agent, this tungstenalloy at least comprises W, Ni, Cu, Fe and Co, and wherein W accounts for mass percent >=85% of this tungstenalloy; Shaping: described tungstenalloy feeding is mapped in mould, to form tungstenalloy green compact in the condition bet that injection temperature is 100-195 DEG C, injection pressure is 600-1800bar, injection speed is 30-140mm/s; Solvent degreasing: described tungstenalloy green compact being placed in temperature is that solvent degreasing 8-24h is carried out in the water-bath of 25-45 DEG C; Atmosphere thermal debinding: be 600-1000 DEG C at skimming temp by the tungstenalloy green compact after solvent degreasing, pushing away boat speed is carry out thermal debinding 10-28h in the decomposition gas of 20-45min/ boat; Atmosphere sintering: be 1400-1500 DEG C in sintering temperature by the tungstenalloy green compact after thermal debinding, pushing away boat speed is carry out sintering 10-28h in the decomposition gas of 20-45min/ boat, obtains high-specific gravity tungsten alloy after cooling.
Preferably, in batching step, water ratio≤0.2% of described tungstenalloy feeding.
Preferably, the density of described tungstenalloy is 16.5-19.0g/cm
3.
Preferably, in batching step, described caking agent is organic adhesive.
Preferably, in solvent degreasing step, normal heptane is utilized to carry out solvent degreasing.
Preferably, in thermal debinding and sintering step, described tungstenalloy green compact all carry out atmosphere thermal debinding and atmosphere sintering in push rod furnace.
Preferably, in thermal debinding and sintering step, all adopt decomposed ammonia as shielding gas.
The invention has the advantages that: the high-specific gravity tungsten alloy that sintering process provided by the invention sinters out, have that density is high, hardness is large, nonmagnetic, sintering temperature is low and thermal expansivity low etc., can the requirements such as hot and humid salt fog be met, and there is the physics close with forging, chemistry and mechanical property.
[embodiment]
Below in conjunction with embodiment, the present invention is elaborated, but it is without any restrictions to scope of the present invention.
A kind of high-specific gravity tungsten alloy provided by the invention is, by metal-powder injection moulding (Metelinjectionmolding is called for short MIM) technique, granular high-specific gravity tungsten alloy feeding is injection molded into desired shape, and then sintering forms.Described high-specific gravity tungsten alloy is base material with W, and add the alloy material of the elements such as a small amount of Ni, Cu, Fe, Co, and wherein, described W accounts for mass percent>=85% of this tungstenalloy, thus makes the density of this tungstenalloy up to 16.5-19.0g/cm
3, thermal conductivity can reach 5 times of grinding tool steel, can weld with copper, silver solder, ray absorption capacity is than plumbous high 30-40%, the shielding in the industries such as military affairs, medical treatment, machinery, electronics, breeding material can be widely used as, e.g., the mass in mobile phone, gyrostatic rotor etc.
Present invention also offers a kind of sintering process making above-mentioned high-specific gravity tungsten alloy, this sintering process comprises the steps:
S1, batching: the tungstenalloy feeding that granular water ratio≤0.2% is provided, this tungstenalloy feeding is mixed by high-specific gravity tungsten alloy powder and organic adhesive, this tungstenalloy at least comprises W, Ni, Cu, Fe and Co, wherein W accounts for mass percent>=85% of this tungstenalloy, thus makes the density of described tungstenalloy reach 16.5-19.0g/cm
3.
S2, shaping: by described tungstenalloy feeding injection temperature 100-195 DEG C, injection pressure 600-1800bar, injection speed 30-140mm/s condition bet be mapped in mould, preferred injection cycle is 25s.The die temperature of described mould preferably selects 35 DEG C, and the dwell pressure in it selects 750bar, 750bar and 100bar successively, and the corresponding dwell time is followed successively by 0.2s, 0.8s and 0.1s.According to the size of actual variant production, this injection cycle, dwell pressure and dwell time all need to adjust, to form flawless tungstenalloy green compact
S3, solvent degreasing: described tungstenalloy green compact being placed in temperature is that solvent degreasing 8-24h is carried out in the water-bath of 25-45 DEG C, and preferred grease-removing agent is normal heptane.
S4, atmosphere thermal debinding: the tungstenalloy green compact after solvent degreasing are placed in decomposed ammonia, and the boat speed that pushes away with 20-45min/ boat in the push rod furnace being 600-1000 DEG C with the highest skimming temp carries out thermal debinding 10-28h.
S5, atmosphere sintering: the tungstenalloy green compact after thermal debinding are placed in decomposed ammonia, with most high sintering temperature for 1400-1500 DEG C, pushing away boat speed is that the push rod furnace of 20-45min/ boat carries out sintering 10-28h, obtains high-specific gravity tungsten alloy after cooling.
The performances such as better anti-oxidant, salt air corrosion are possessed in order to make the high-specific gravity tungsten alloy after sintering, can also heat-treat the tungstenalloy after sintering or the subsequent technique such as plating, namely the tungstenalloy after sintering is heat-treated or the tungstenalloy after sintering is electroplated, to form coating on described tungstenalloy surface.
The high-specific gravity tungsten alloy that sintering process provided by the invention sinters out, have that density is high, hardness is large, nonmagnetic, sintering temperature is low and thermal expansivity low etc., can the requirements such as hot and humid salt fog be met, and there is the physics close with forging, chemistry and mechanical property.
The foregoing is only better embodiment of the present invention; protection scope of the present invention is not limited with above-mentioned embodiment; in every case those of ordinary skill in the art modify or change according to the equivalence that disclosed content is done, and all should include in the protection domain recorded in claims.
Claims (7)
1. a sintering process for high-specific gravity tungsten alloy, is characterized in that, this technique comprises the following steps:
Batching: provide granular tungstenalloy feeding, this tungstenalloy feeding is mixed by high-specific gravity tungsten alloy powder and caking agent, and this tungstenalloy at least comprises W, Ni, Cu, Fe and Co, and wherein W accounts for mass percent >=85% of this tungstenalloy;
Shaping: described tungstenalloy feeding is mapped in mould, to form tungstenalloy green compact in the condition bet that injection temperature is 100-195 DEG C, injection pressure is 600-1800bar, injection speed is 30-140mm/s;
Solvent degreasing: described tungstenalloy green compact being placed in temperature is that solvent degreasing 8-24h is carried out in the water-bath of 25-45 DEG C;
Atmosphere thermal debinding: be 600-1000 DEG C at skimming temp by the tungstenalloy green compact after solvent degreasing, pushing away boat speed is carry out thermal debinding 10-28h in the decomposition gas of 20-45min/ boat;
Atmosphere sintering: be 1400-1500 DEG C in sintering temperature by the tungstenalloy green compact after thermal debinding, pushing away boat speed is carry out sintering 10-28h in the decomposition gas of 20-45min/ boat, obtains high-specific gravity tungsten alloy after cooling.
2. the sintering process of high-specific gravity tungsten alloy according to claim 1, is characterized in that: in batching step, water ratio≤0.2% of described tungstenalloy feeding.
3. the sintering process of high-specific gravity tungsten alloy according to claim 1, is characterized in that: the density of described tungstenalloy is 16.5-19.0g/cm
3.
4. the sintering process of high-specific gravity tungsten alloy according to claim 1, is characterized in that: in batching step, and described caking agent is organic adhesive.
5. the sintering process of high-specific gravity tungsten alloy according to claim 1, is characterized in that: in solvent degreasing step, utilizes normal heptane to carry out solvent degreasing.
6. the sintering process of high-specific gravity tungsten alloy according to claim 1, is characterized in that: in thermal debinding and sintering step, and described tungstenalloy green compact all carry out atmosphere thermal debinding and atmosphere sintering in push rod furnace.
7. the sintering process of the high-specific gravity tungsten alloy according to claim 1 or 6, is characterized in that: in thermal debinding and sintering step, all adopts decomposed ammonia as shielding gas.
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| CN201510618742.5A CN105154700A (en) | 2015-09-24 | 2015-09-24 | Heavy-density tungsten alloy |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105861980A (en) * | 2016-05-25 | 2016-08-17 | 广州新莱福磁电有限公司 | Anti-corrosion method for high-gravity alloy |
| CN105946382A (en) * | 2016-05-12 | 2016-09-21 | 上海大学 | Method for preparing metal shielding parts through screen printing technology |
| CN108300903A (en) * | 2017-01-11 | 2018-07-20 | 深圳市天悦硬质合金有限公司 | White tungsten alloy and preparation method thereof |
| CN108311695A (en) * | 2018-02-13 | 2018-07-24 | 沈阳含能金属材料制造有限公司 | A kind of decarbonization process of tungsten alloy blank material |
| CN110172598A (en) * | 2018-12-13 | 2019-08-27 | 苏州赛特锐精密机械配件有限公司 | A kind of method of co-injection preparation bi-component tungsten-copper alloy |
| CN110527886A (en) * | 2019-09-02 | 2019-12-03 | 广州市华司特合金制品有限公司 | A kind of clock and watch are again vertical and preparation method thereof |
| CN110538992A (en) * | 2019-09-19 | 2019-12-06 | 深圳市鑫迪科技有限公司 | Diffusion welding process for tungsten alloy and 316L stainless steel |
| CN110883335A (en) * | 2019-11-05 | 2020-03-17 | 厦门虹鹭钨钼工业有限公司 | Preparation method of integrated tungsten alloy lure |
| CN112570710A (en) * | 2020-12-31 | 2021-03-30 | 江苏米莫金属股份有限公司 | Tungsten alloy powder casting processing method |
| CN114247885A (en) * | 2021-12-24 | 2022-03-29 | 宁波振华新材料有限公司 | Manufacturing method of tungsten alloy mass block for linear vibration motor |
| CN115011853A (en) * | 2022-06-17 | 2022-09-06 | 深圳艾利佳材料科技有限公司 | Tungsten alloy with high extensibility and preparation process thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105946382A (en) * | 2016-05-12 | 2016-09-21 | 上海大学 | Method for preparing metal shielding parts through screen printing technology |
| CN105861980A (en) * | 2016-05-25 | 2016-08-17 | 广州新莱福磁电有限公司 | Anti-corrosion method for high-gravity alloy |
| CN108300903A (en) * | 2017-01-11 | 2018-07-20 | 深圳市天悦硬质合金有限公司 | White tungsten alloy and preparation method thereof |
| CN108311695A (en) * | 2018-02-13 | 2018-07-24 | 沈阳含能金属材料制造有限公司 | A kind of decarbonization process of tungsten alloy blank material |
| CN110172598A (en) * | 2018-12-13 | 2019-08-27 | 苏州赛特锐精密机械配件有限公司 | A kind of method of co-injection preparation bi-component tungsten-copper alloy |
| CN110527886A (en) * | 2019-09-02 | 2019-12-03 | 广州市华司特合金制品有限公司 | A kind of clock and watch are again vertical and preparation method thereof |
| CN110538992A (en) * | 2019-09-19 | 2019-12-06 | 深圳市鑫迪科技有限公司 | Diffusion welding process for tungsten alloy and 316L stainless steel |
| CN110883335A (en) * | 2019-11-05 | 2020-03-17 | 厦门虹鹭钨钼工业有限公司 | Preparation method of integrated tungsten alloy lure |
| CN112570710A (en) * | 2020-12-31 | 2021-03-30 | 江苏米莫金属股份有限公司 | Tungsten alloy powder casting processing method |
| CN114247885A (en) * | 2021-12-24 | 2022-03-29 | 宁波振华新材料有限公司 | Manufacturing method of tungsten alloy mass block for linear vibration motor |
| CN115011853A (en) * | 2022-06-17 | 2022-09-06 | 深圳艾利佳材料科技有限公司 | Tungsten alloy with high extensibility and preparation process thereof |
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