CN103409676A - Method for improving heat conductivity of tungsten copper alloy - Google Patents
Method for improving heat conductivity of tungsten copper alloy Download PDFInfo
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- CN103409676A CN103409676A CN2013103164776A CN201310316477A CN103409676A CN 103409676 A CN103409676 A CN 103409676A CN 2013103164776 A CN2013103164776 A CN 2013103164776A CN 201310316477 A CN201310316477 A CN 201310316477A CN 103409676 A CN103409676 A CN 103409676A
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Abstract
The invention discloses a method for improving the heat conductivity of tungsten copper alloy. The method comprises the following steps: step 1, the tungsten copper alloy is prepared through a powder metallurgy method, wherein the mass fraction of the tungsten is 80-85%, and the rest is copper; step 2, the tungsten copper alloy prepared through the powder metallurgy method is subjected to heat treatment under ultrahigh pressure, wherein the ultrahigh pressure is 3.0-5.0 GPa, the heating temperature under the ultrahigh pressure is 820-900 DEG C; the tungsten copper alloy is subjected to heat insulation for 20-30 min, and then is cooled naturally under the ultrahigh pressure until being cooled to the room temperature; step 3, the tungsten copper alloy subjected to the heat treatment under the ultrahigh pressure is placed in a nitrogen-protected normal-pressure resistance furnace to be heated to 450-550 DEG C; the time for aging treatment is 90-120 min; the tungsten copper alloy is cooled naturally until being cooled to the room temperature. According to the method, the problem that tungsten copper alloy prepared through the powder metallurgy method is not high in density and lower in heat conductivity is solved. The method mainly adopts the ultrahigh-pressure heat treatment technique, and has the advantages that the feasibility is high, the technique is simple, the quality of the tungsten copper alloy is stable, and the heat conductivity of the tungsten copper alloy can be improved greatly.
Description
Technical field
The invention belongs to technical field of metal material preparation, particularly a kind of method that improves the tungsten-copper alloy thermal conductivity.
Background technology
Tungsten-copper alloy is to take tungsten, copper to be a kind of alloy of main composition, belongs to metal-base composites.Due to tungsten-copper alloy, combine the characteristics of tungsten and copper, therefore have high temperature resistant, the premium propertiess such as intensity large, arc ablation resistance, density are large, conduction, heat conductivility height, can be used as the uses such as military high temperature material, used for high-voltage switch electrical alloy, edm electrode, microelectronic material, its widespread use in the fields such as aerospace, power electronics, mechanical metallurgy, sports equipment as component and components and parts.
The main method for preparing tungsten-copper alloy has powder metallurgic method, injection molding, cupric oxide powder method, W skeleton infiltration method etc.Wherein powder metallurgy process is the most frequently used tungsten-copper alloy preparation method, and its technical process is: the tungsten copper mixed powder is through compression moulding, then 1300-1500 ℃ of liquid phase sintering.The advantage of this method is the tungsten-copper alloy that can prepare various composition proportion, but in the situation that do not add activator (nickel, iron etc.), be difficult to reach fine and close, there is the more space of closing, density is usually less than 98%, if the interpolation activator, but can make the conducting energy of alloy greatly descend, can not meet service requirements.During reality is produced, often by activated sintering method, mechanical alloying method or the oxide compound co-reducing process that adds a small amount of nickel, prepare ultra-fine, nanometer powder and can improve sintering activity, thereby improve the density of tungsten-copper alloy.But nickel activated sintering meeting significantly reduces the conduction of material, heat conductivility, impurity is introduced in mechanical alloying also can reduce the conductivity of materials energy.The heat conductivility that how to improve tungsten-copper alloy prepared by powder metallurgic method is the focus that the Materials science worker pays close attention to all the time.
Summary of the invention
The object of the present invention is to provide a kind of method that improves the tungsten-copper alloy thermal conductivity, the problem that the tungsten-copper alloy density is not high, heat conductivility is lower prepared for powder metallurgic method, the main ultra-high voltage thermal treatment process that adopts, exploitativeness is strong, technique is simple, steady quality, can improve the tungsten-copper alloy thermal conductivity by a relatively large margin.
The present invention is by the following technical solutions:
A kind of method that improves the tungsten-copper alloy thermal conductivity, wherein, comprise the steps:
Step 1, the tungsten-copper alloy that adopts powder metallurgic method to prepare, wherein the massfraction of tungsten is 80-85%, all the other are copper;
Step 2, tungsten-copper alloy prepared by powder metallurgic method carries out ultra-high voltage thermal treatment, and the pressure of ultra-high voltage is 3.0-5.0GPa, and under ultra-high voltage, Heating temperature is 820-900 ℃, insulation 20-30min, and naturally cool to room temperature under ultra-high voltage;
Step 3, the normal pressure resistance furnace of the alloy material after above-mentioned ultra-high voltage thermal treatment being put into to nitrogen protection is heated to 450-550 ℃, and ageing treatment 90-120min, naturally cool to room temperature.
As preferably, in described step 2, in six-plane piercer, carry out uhp treatment.When carrying out the ultra-high voltage low-temperature heat treatment, assembling mode adopts the method for heater-type.
As preferably, described normal pressure resistance furnace is SK2-2-13 type tube type resistance furnace.
The reason that the present invention adopts the ultra-high voltage heat-treating methods to improve the heat conductivility of tungsten-copper alloy material is: (1) ultra-high voltage can be eliminated the micro-space of remnants of tungsten-copper alloy, the textural defect such as loose, effectively improve the density of tungsten-copper alloy sample, make the crystal grain continuity strengthen; (2) ultra-high voltage can be so that the rising of the inner lattice distortion of alloy and interior energy, and for forming core and the growth of precipitated phase provides favourable condition, so the lattice of principal phase is more complete, and microstructure is even compact more; (3) the highest through ageing treatment, make the defect eliminations such as tungsten-copper alloy microstructure Dislocations, add the raising of tungsten-copper alloy compactness, consequently reduced the scattering process of lattice defect to electronics, improved the heat conductivility of tungsten-copper alloy.
Beneficial effect of the present invention is:
Exploitativeness of the present invention is strong, and technique is simple, through the heat treated constant product quality of ultra-high voltage.Due to the uhp treatment mode adopted between low-temperature short-time, not only make tungsten-copper alloy crystal grain can abnormal growth and also its mechanical property also improve to some extent.The tungsten-copper alloy of processing through the method can obtain and increase substantially heat conductivility, and microstructure even compact more, can improve 40.0-45.2% with untreated tungsten-copper alloy phase specific thermal conductivity, has significant economic benefit.
Embodiment
Embodiment 1:
Tungsten-copper alloy prepared by the powder metallurgic method that to get massfraction (wt%) be 165.0 W/ (mK) for tungsten 85%, copper 15%, thermal conductivity, place it on RC-51 type six-plane piercer and carry out uhp treatment, pressure is 3.0GPa, Heating temperature is 820 ℃, soaking time is 20min, naturally cools to room temperature.And then above-mentioned tungsten-copper alloy after autoclaving is placed in SK2-2-13 type tube type resistance furnace and carries out ageing treatment, the lower Heating temperature of flowing nitrogen protection is 450 ℃, anneal 90min, the natural air cooling of coming out of the stove.The thermal conductivity of this sample that process the present invention processed is 231.0W/ (mK), and its heat conductivility improves 40.0%.
Embodiment 2:
Getting massfraction (wt%) is the tungsten-copper alloy of 165.0 W/ (mK) for tungsten 85%, copper 15%, thermal conductivity, place it on RC-51 type six-plane piercer and carry out uhp treatment, pressure is 5.0GPa, and Heating temperature is 900 ℃, soaking time is 30min, naturally cools to room temperature.And then above-mentioned tungsten-copper alloy after autoclaving is placed in SK2-2-13 type tube type resistance furnace and carries out ageing treatment, the lower Heating temperature of flowing nitrogen protection is 550 ℃, anneal 120min, the natural air cooling of coming out of the stove.The thermal conductivity of this sample that process the present invention processed is 239.6W/ (mK), and its heat conductivility improves 45.2%.
Embodiment 3:
Getting massfraction (wt%) is the tungsten-copper alloy of 175.5W/ (mK) for tungsten 80%, copper 20%, thermal conductivity, place it on RC-51 type six-plane piercer and carry out uhp treatment, pressure is 4.0GPa, and Heating temperature is 850 ℃, soaking time is 25min, naturally cools to room temperature.And then above-mentioned tungsten-copper alloy after autoclaving is placed in SK2-2-13 type tube type resistance furnace and carries out ageing treatment, the lower Heating temperature of flowing nitrogen protection is 500 ℃, anneal 100min, the natural air cooling of coming out of the stove.The thermal conductivity of this sample that process the present invention processed is 252.4W/ (mK), and its heat conductivility improves 43.8%.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, other modifications that those of ordinary skills make technical scheme of the present invention or be equal to replacement, only otherwise break away from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. a method that improves the tungsten-copper alloy thermal conductivity, is characterized in that: comprise the steps:
Step 1, the tungsten-copper alloy that adopts powder metallurgic method to prepare, wherein the massfraction of tungsten is 80-85%, all the other are copper;
Step 2, tungsten-copper alloy prepared by powder metallurgic method carries out ultra-high voltage thermal treatment, and the pressure of ultra-high voltage is 3.0-5.0GPa, and under ultra-high voltage, Heating temperature is 820-900 ℃, insulation 20-30min, and naturally cool to room temperature under ultra-high voltage;
Step 3, the normal pressure resistance furnace of the alloy material after above-mentioned ultra-high voltage thermal treatment being put into to nitrogen protection is heated to 450-550 ℃, and ageing treatment 90-120min, naturally cool to room temperature.
2. a kind of method that improves the tungsten-copper alloy thermal conductivity according to claim 1, is characterized in that: in described step 2, in six-plane piercer, carry out uhp treatment.
3. a kind of method that improves the tungsten-copper alloy thermal conductivity according to claim 1 and 2, it is characterized in that: described normal pressure resistance furnace is SK2-2-13 type tube type resistance furnace.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115961165A (en) * | 2022-10-26 | 2023-04-14 | 西南科技大学 | Preparation method of high-dislocation-density tungsten alloy material |
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| JP2000063974A (en) * | 1998-08-18 | 2000-02-29 | Daido Steel Co Ltd | Copper - tungsten sintered alloy and its manufacture |
| CN1590571A (en) * | 2003-09-05 | 2005-03-09 | 上海材料研究所 | Tungsten copper functional composite material and its preparation technology |
| CN1632145A (en) * | 2004-12-27 | 2005-06-29 | 西安理工大学 | Process for sintering and infiltration preparation of tungsten chrome-copper composite materials |
| CN102280206A (en) * | 2011-05-30 | 2011-12-14 | 宝鸡市飞腾金属材料有限公司 | Method for manufacturing tungsten-copper alloy wire rod |
| CN102644042A (en) * | 2012-04-11 | 2012-08-22 | 燕山大学 | Method for increasing electric conductivity of copper-chromium alloy |
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2013
- 2013-07-26 CN CN2013103164776A patent/CN103409676A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000063974A (en) * | 1998-08-18 | 2000-02-29 | Daido Steel Co Ltd | Copper - tungsten sintered alloy and its manufacture |
| CN1590571A (en) * | 2003-09-05 | 2005-03-09 | 上海材料研究所 | Tungsten copper functional composite material and its preparation technology |
| CN1632145A (en) * | 2004-12-27 | 2005-06-29 | 西安理工大学 | Process for sintering and infiltration preparation of tungsten chrome-copper composite materials |
| CN102280206A (en) * | 2011-05-30 | 2011-12-14 | 宝鸡市飞腾金属材料有限公司 | Method for manufacturing tungsten-copper alloy wire rod |
| CN102644042A (en) * | 2012-04-11 | 2012-08-22 | 燕山大学 | Method for increasing electric conductivity of copper-chromium alloy |
Non-Patent Citations (3)
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| 李小雷等: "高压热处理对AlN陶瓷显微结构及导热性能的影响", 《无机材料学报》, vol. 25, no. 5, 31 May 2010 (2010-05-31) * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115961165A (en) * | 2022-10-26 | 2023-04-14 | 西南科技大学 | Preparation method of high-dislocation-density tungsten alloy material |
| CN115961165B (en) * | 2022-10-26 | 2024-06-25 | 西南科技大学 | Preparation method of tungsten alloy material with high dislocation density |
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Application publication date: 20131127 |