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Method for in-situ self-reproducing tungsten boride reinforced CuW alloy

A self-generated tungsten boride and alloy technology, applied in the field of electrical materials, can solve the problems of particle surface pollution, avoid surface pollution, save time and cost, and reduce the process of adding and mixing

Active Publication Date: 2019-11-05
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for in-situ self-generated tungsten boride to strengthen CuW alloy, which is used to improve the arc ablation resistance of CuW materials, and the in-situ reaction solves the problem of surface pollution of particles caused by external reinforcement phase

Method used

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  • Method for in-situ self-reproducing tungsten boride reinforced CuW alloy
  • Method for in-situ self-reproducing tungsten boride reinforced CuW alloy
  • Method for in-situ self-reproducing tungsten boride reinforced CuW alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh W powder and B powder (with an average particle size of 0.2 μm) with an average particle size of 1 μm. The amount of B powder added is 0.2% of the W powder quality, and the induced copper powder (average particle diameter at 5 μm) of W powder quality 5% is mixed on the V-shaped mixer of 80r / min for 4 hours, and used after mixing. Press and form with a hydraulic press to obtain a W compact. The pressing pressure is 350MPa, and the holding time is 50s. Put the W compact into a graphite crucible, then put the crucible into an atmosphere sintering furnace, and after passing in hydrogen gas for 40 minutes, check the purity of the hydrogen gas, ignite the hydrogen gas after confirming safety, turn on the cooling water, and start heating at a rate of 8°C / min. The heating rate is to raise the temperature. When the sintering temperature is 600°C, keep the temperature for 1.5h and then raise the temperature to 1000°C at a speed of 10°C / min, and the holding time is 1h. Nat...

Embodiment 2

[0041] Weigh W powder and B powder (with an average particle size of 25 μm) with an average particle size of 15 μm. The amount of B powder added is 0.4% of the W powder quality, and the induced copper powder (average particle diameter at 60 μm) of W powder quality 8%, is mixed on the V-shaped mixer of 50r / min for 8 hours, and used after mixing. Press and form with a hydraulic press to obtain a W compact. The pressing pressure is 400MPa, and the holding time is 50s. Put the W compact into a graphite crucible, then put the crucible into an atmosphere sintering furnace, and after passing in hydrogen gas for 40 minutes, check the purity of the hydrogen gas, ignite the hydrogen gas after confirming safety, turn on the cooling water, and start heating at a rate of 20°C / min. The heating rate is to raise the temperature. When the sintering temperature is 800°C, keep it for 1 hour and then raise the temperature to 950°C at a speed of 15°C / min. Then stack the cleaned pure copper block...

Embodiment 3

[0043]Weigh W powder with an average particle size of 15 μm and B powder (with an average particle size of 30 μm). The amount of B powder added is 0.6% of the W powder quality, and the induced copper powder (average particle size at 30 μm) of the W powder quality 7%, is mixed for 6 hours on the V-type mixer of 60r / min, and used after mixing. Press and form with a hydraulic press to obtain a W compact. The pressing pressure is 150MPa, and the holding time is 90s. Put the W compact in the graphite crucible, then put the crucible into the atmosphere sintering furnace, pass in the hydrogen gas for 40 minutes, check the purity of the hydrogen gas, ignite the hydrogen gas after confirming the safety, turn on the cooling water, and start heating at a rate of 10°C / min. The heating rate is raised. When the sintering temperature is 1000°C, after holding for 1.5h, the temperature is raised to 1200°C at a speed of 20°C / min, and the holding time is 1h. It is naturally cooled to room tempe...

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Abstract

The invention discloses a method for in-situ self-reproducing a tungsten boride reinforced CuW alloy. The method for in-situ self-reproducing the tungsten boride reinforced CuW alloy comprises the steps of uniformly mixing W powder, B powder and induced copper powder, and carrying out compression moulding to obtain a tungsten compression blank; placing the tungsten compression blank into an atmosphere sintering furnace for sintering, and obtaining a tungsten skeleton; and placing a pure copper block above the tungsten skeleton, placing into a graphite crucible paved with graphite paper, carrying out infiltration in the sintering furnace, and obtaining the in-situ self-reproduced tungsten boride reinforced CuW alloy. According to the method for in-situ self-reproducing the tungsten boride reinforced CuW alloy provided by the invention, through adopting a sintering-infiltrating method, a ceramic phase W2B is in-situ generated in a CuW material, and an electric arc is effectively dispersed due to the existence of the low-escape ceramic phase, so that the arc ablation resistance of the CuW contact material is improved; and meanwhile, by adopting the in-situ produced tungsten boride reinforced CuW material, the particular surface pollution of a reinforced phase is avoided.

Description

technical field [0001] The invention belongs to the technical field of electrical materials, and in particular relates to a method for in-situ self-generated tungsten boride strengthening CuW alloy. Background technique [0002] CuW material combines the high melting point of tungsten, high hardness, high ablation resistance and welding resistance, low thermal expansion coefficient, high electrical conductivity, high thermal conductivity, and good plasticity of copper, so it is widely used as a variety of high-voltage Electrical contacts in a switch. With the implementation and construction of the UHV power grid, CuW electrical contact materials are required to have greater breaking current capability, higher withstand voltage strength and long service life. During the breaking process, the contacts will bear the ablation of the high-voltage arc. Especially when used in EHV and UHV circuit breakers, due to the higher voltage, it is more likely to cause failure of electrica...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C27/04
CPCC22C1/1036C22C27/04
Inventor 杨晓红赵伊鹏邹军涛梁淑华肖鹏
Owner XIAN UNIV OF TECH
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