CN1271026A - High-expansibility tungsten alloy - Google Patents
High-expansibility tungsten alloy Download PDFInfo
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- CN1271026A CN1271026A CN 00112860 CN00112860A CN1271026A CN 1271026 A CN1271026 A CN 1271026A CN 00112860 CN00112860 CN 00112860 CN 00112860 A CN00112860 A CN 00112860A CN 1271026 A CN1271026 A CN 1271026A
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- tungsten
- expansibility
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Abstract
The invented high-expandability tungsten alloy has the composition of: tungsten 50-70%, copper 20-45%, nickel 1-5% and intensifying element 0.1-2%. It has a linear expansion coefficient as high as (10-12) E (-6) each deg.C and is especially suitable for use in high-performance gyroscope.
Description
The present invention relates to a kind of high-expansibility tungsten alloy technology.
High expansion tungsten-bast alloy is mainly used in the navigation gyrosystem.Used material is a tungsten heavy alloy at present.The component of this tungsten heavy alloy is tungsten, copper, nickel, and wherein the content of tungsten is 90～97%, and surplus is nickel and copper.The coefficient of expansion of the alloy of this component is generally 5～7 * 10
-6/ ℃, than the coefficient of expansion of the peripheral material that matches with it (generally 13～17 * 10
-6/ ℃) much smaller.And this difference of the coefficient of expansion will produce adverse influence to the precision that whole parts assemble, and when especially the circumstance of temperature difference between space and ground was big, its influence was just more remarkable.
The objective of the invention is to overcome the above-mentioned shortcoming of prior art, provide a kind of and the more approaching tungstenalloy of coefficient of expansion peripheral material with high expansion coefficient characteristic.
High-expansibility tungsten alloy of the present invention, its component comprises tungsten, copper, nickel, also have a strengthening element in the described component, the weight percent between described tungsten, copper, nickel and the strengthening element is: tungsten: copper: nickel: strengthening element=50～70%: 20～45%: 1～5%: 0.1～2%.
This high-expansibility tungsten alloy has been adjusted the composition prescription, the content of tungsten is reduced to below 70% from 90～97% of former number, the content that will have the copper of high expansion coefficient brings up to 20～45%, and cooperate adding one strengthening element and nickel effect formation intermetallic compound and nickel precipitation from bond is mutually come out, weaken the bonding interaction alternate with tungsten, thereby eliminate the disadvantageous effect of nickel, and improve the intensity of this alloy the coefficient of expansion.Owing to rolling up of the copper with high expansion coefficient, thereby the coefficient of expansion of tungstenalloy of the present invention is improved greatly.Test result shows, the high-expansibility tungsten alloy of the present invention that utilizes the ordinary powder metallurgical technology to produce, and its linear expansivity can reach 10～12 * 10
-6/ ℃.When being used for the gyrostat manufacturing, can realizing matched well and improve precision of gyroscope greatly with associated materials.
Adopt molten cementation process of hydrogen and the molten cementation process of vacuum also can make its coefficient of expansion and reach 10 * 10
-6/ ℃ high-expansibility tungsten alloy.Because the coefficient of expansion is by the decision of the essential characteristic of element, and is insensitive to alloy microstructure, so preparation technology is little to the influence of the coefficient of expansion.
Described strengthening element can be selected silicon for use.
Described strengthening element can also aluminium.
Add silicon and aluminium and all be rely on form nisiloy or intermetallic Ni-Al compound and make nickel from bonding mutually precipitation come out, make the alloy swelling property close to pseudoalloy.From the result, add the better effects if of silicon.
Advantage of the present invention is to have improved the coefficient of expansion of tungstenalloy and the homogeneity of density greatly, has realized the matched well with associated materials, thereby the performance as the product of gyrostat and so on that contains the tungstenalloy composition is improved greatly, and lumber recovery also obviously improves.
Following table has provided embodiments of the invention.
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Remarks | |
| Tungsten | ????500 | ????700 | ????650 | FW-1 tungsten powder 2～4um |
| Copper | ????440 | ????270 | ????320 | Copper reduction-300 order |
| Nickel | ????50 | ????25 | ????15 | Reduced nickel powder-300 order |
| Silicon | ????10 | ????5 | Silica flour-200 order | |
| Aluminium | ????15 | Aluminium powder-200 order | ||
| Density | ????11.5g/cm 3 | ???13.5g/cm 3 | ????13g/cm 3 | |
| Linear expansivity | ????12.2×10 -6/℃ | ???11.2×10 -6/℃ | ????10×10 -6/℃ |
Its technical process is:
1, above-mentioned powder packed into ground 24～72 hours in the ball grinding cylinder;
2, the material that mill is good 300 mesh sieves, mix 1～2% paraffin or 1% polyvinyl alcohol then, under 80～100 ℃ of temperature dry 2～4 hours;
3, the material of having mixed forming agent connects the weight that needs and takes by weighing, in the punching block of packing into, on hydropress with 1～3 ton/cm
2Pressure compression moulding;
4, the blank after the moulding was in 100 ℃～150 ℃ dryings 2～4 hours;
5, dried blank is packed in the boat, and is multiple with aluminum oxide powder, under hydrogen shield in 1300 ℃～1400 ℃ sintering temperatures 1 hour;
6, sintered compact is 5 * 10
-2Under 850 ℃～1100 ℃ temperature, heated 1～2 hour shrend cooling then under the air pressure below the torr;
7, under 400 ℃～700 ℃ temperature, be incubated 2～4 hours again after the shrend and promptly get this high-expansibility tungsten alloy product.
Claims (3)
1, high-expansibility tungsten alloy, its component comprises tungsten, copper, nickel, it is characterized in that also having a strengthening element in the described component, the heavy per-cent between described tungsten, copper, nickel and the strengthening element is: tungsten: copper: nickel: strengthening element=50～70%: 20～45%: 1～5%: 0.1～2%.
2, high-expansibility tungsten alloy as claimed in claim 1 is characterized in that described strengthening element is a silicon.
3, high-expansibility tungsten alloy as claimed in claim 1 is characterized in that described strengthening element is an aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001128604A CN1148462C (en) | 2000-04-19 | 2000-04-19 | High-expansibility tungsten alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001128604A CN1148462C (en) | 2000-04-19 | 2000-04-19 | High-expansibility tungsten alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1271026A true CN1271026A (en) | 2000-10-25 |
| CN1148462C CN1148462C (en) | 2004-05-05 |
Family
ID=4582686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001128604A Expired - Fee Related CN1148462C (en) | 2000-04-19 | 2000-04-19 | High-expansibility tungsten alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1148462C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978205A (en) * | 2013-02-07 | 2014-08-13 | 上海六晶金属科技有限公司 | Method for sintering green bodies of tungsten metal plates, molybdenum metal plates, tungsten alloy plates or molybdenum alloy plates |
-
2000
- 2000-04-19 CN CNB001128604A patent/CN1148462C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103978205A (en) * | 2013-02-07 | 2014-08-13 | 上海六晶金属科技有限公司 | Method for sintering green bodies of tungsten metal plates, molybdenum metal plates, tungsten alloy plates or molybdenum alloy plates |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1148462C (en) | 2004-05-05 |
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