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Activated sintering preparation method of fine crystalline non-magnetic wolfram-copper alloy

A technology of activating sintering and copper alloys, which is applied in the field of activating sintering preparation of fine-grained non-magnetic tungsten-copper alloys, can solve the problems that it is difficult to achieve uniform distribution of tungsten-copper phases, complex processes, and difficult industrialization, etc., and achieve excellent mechanical properties. Performance and thermal conductivity, simple process, no pollution effect

Inactive Publication Date: 2008-02-06
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Methods (4), (5), and (6) are sintered by infiltration method, and it is difficult to achieve uniform distribution of tungsten-copper phase
Method (7) can obtain a fine-grained tungsten-based bulk material with a grain size equivalent to that of the initial tungsten powder, but the process is complicated and difficult to industrialize

Method used

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  • Activated sintering preparation method of fine crystalline non-magnetic wolfram-copper alloy
  • Activated sintering preparation method of fine crystalline non-magnetic wolfram-copper alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1: prepare W-5Cu composite powder according to the preparation method of the tungsten-copper composite powder of high-density alloy whose application number is 200610124767.0, the average grain size of W in the composite powder is 250nm; the composite powder is compression molded, and the molding agent is 2wt.% solid paraffin, molding pressure is 20MPa, cold isostatic pressing, pressure is 200MPa, green body size is 30mm×10mm×6mm. The green body is sintered in a high temperature tube furnace. First, use high-purity nitrogen to discharge the air in the tube furnace, and then introduce hydrogen, the flow rate of hydrogen is 500ml / min, and the temperature is raised to 375°C at a heating rate of 5°C / min, and the molding agent is removed by keeping it for 1 hour; then, at 5°C Raise the temperature to 800°C at a heating rate of 5°C / min and keep it warm for 1 hour; continue to raise the temperature to 900°C at a heating rate of 5°C / min and keep warm for 1 hour; then...

Embodiment 2

[0039] Embodiment 2: Prepare W-15Cu composite powder according to the preparation method of the tungsten-copper composite powder of high-density alloy whose application number is 200610124767.0, the average grain size of W in the composite powder is 250nm; the composite powder is compression molded, and the forming agent is 1wt.% liquid paraffin, the molding pressure is 15MPa, cold isostatic pressing, the pressure is 180MPa, and the green body size is 30mm×10mm×6mm. The green body is sintered in a high temperature tube furnace. First, high-purity nitrogen is used to discharge the air in the tube furnace, and then a mixed gas of hydrogen and high-purity argon is introduced, the volume ratio is 5:1, the gas flow rate is 500ml / min, and the temperature is raised to 5°C / min. 380°C, hold for 1 hour to remove the molding agent; then raise the temperature to 800°C at a heating rate of 5°C / min, and hold for 1 hour; continue to raise the temperature to 900°C at a heating rate of 5°C / min...

Embodiment 3

[0040] Embodiment 3: prepare W-45Cu composite powder according to the preparation method of the tungsten-copper composite powder of high-density alloy whose application number is 200610124767.0, the average grain size of W in the composite powder is 250nm; the composite powder is compression molded, and the forming agent is 2wt.% polyvinyl alcohol, molding pressure is 40MPa, cold isostatic pressing treatment, pressure is 150MPa, green body size is 30mm×10mm×6mm. The green body is sintered in a high temperature tube furnace. First use high-purity nitrogen to discharge the air in the tube furnace, and then introduce a mixed gas of hydrogen and high-purity nitrogen, the volume ratio is 5:1, the gas flow rate is 500ml / min, and the temperature is raised to 400°C at a heating rate of 5°C / min. , keep warm for 1 hour to remove the molding agent; then raise the temperature to 800°C at a heating rate of 5°C / min, and keep warm for 1 hour; continue to raise the temperature to 900°C at a h...

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Abstract

The present invention belongs to an activated sintering method of a high-density aplitic non-magnetic Tungsten-Cu alloy. Tungsten-Cu composite powders are adopted as raw materials with an average particle size of less than 500nms, and the average size of the tungsten particles is less than 300nms. The base bodies of needed shapes and sizes are prepared adopting conventional moulding method and directly sent into a welding furnace to be sintered in a mixed atmosphere of protection and reducibility or in an atmosphere of reducibility. The sintering temperature is 1100-1340 degrees Celsius system, the heat holding time is 40-60 minutes and the present invention adulterates no activating agents. The prepared aplitic Tungsten-Cu alloy adopting the present invention is characterized in that the grain granularity is fine, the average grain size of tungsten is less than or equal to 800nms, the organizational structure is evenly distributed and the relative density of the alloy is more than 99 percent. The high density Tungsten-Cu alloy prepared using the invention has an excellent mechanical property and thermal conductivity, guards against the aliquation of copper efficiently, and is fine in granularity and high in intensity, plasticity and thermal conductivity. The invention is simple in technics, easy to control, pollution-free, low in investment cost, low in energy consumption and applicable to a mass industrial production.

Description

technical field [0001] The invention belongs to an activation sintering preparation method of a fine-grain non-magnetic tungsten-copper alloy. Background technique [0002] Tungsten-copper (W-Cu) composite material is composed of tungsten with high melting point, low expansion rate, high strength and copper with good thermal conductivity. Tungsten-copper composite materials have good arc erosion resistance, fusion welding resistance, high strength, high hardness, high thermal conductivity and low thermal expansion coefficient, etc., and are currently widely used as electrical contact materials, resistance welding, EDM and Plasma electrode materials, military sweating materials, electronic packaging and heat sink materials, etc. With the continuous development of high technology, higher requirements are put forward for the performance of tungsten-copper (W-Cu) alloy. For example, in microwave components, W-15Cu is often used, because the linear expansion coefficient of BeO ...

Claims

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Application Information

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IPC IPC(8): C22C1/04B22F3/16B22F9/04C22C27/04
Inventor 史晓亮杨华段兴龙邵刚勤王盛王天国赵晓峰闫丽张文俊
Owner WUHAN UNIV OF TECH
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