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Titanium diboride reinforced CuW alloy in-situ synthesis method

A titanium diboride, in-situ self-generation technology, applied in the direction of contacts, electrical components, circuits, etc., can solve problems such as copper liquid splashing, CuW electrical contact ablation, etc., to avoid surface pollution, facilitate the preparation process, reduce The effect of adding to the process of mixing

Active Publication Date: 2019-01-15
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Studies have shown that the electrical breakdown of CuW alloys first occurs on the copper phase with a low work function. CuW alloys prepared by ordinary infiltration methods usually have some copper-rich regions, so the breakdown position of the arc is often selected in the copper-rich regions. , causing a large area of ​​copper liquid splashing, resulting in concentrated ablation of CuW electrical contacts

Method used

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  • Titanium diboride reinforced CuW alloy in-situ synthesis method
  • Titanium diboride reinforced CuW alloy in-situ synthesis method
  • Titanium diboride reinforced CuW alloy in-situ synthesis method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Put the polished Ti sheet (thickness 0.5mm) and Cu block into the vacuum induction melting furnace from bottom to top in turn, wherein the amount of Ti used is 0.5% of the mass of Cu used, and then vacuumed to 4×10 -3 Above Pa, fill a small amount of argon protective gas and start smelting. Firstly, the current is raised to 25A at 2A / min, the temperature is raised to 1000°C, and the temperature is kept for 4 minutes, and then the current is raised to 25A, the temperature is 1300°C, and the temperature is kept for 15 minutes, and the CuTi alloy is obtained by cooling with the furnace. Weigh W powder with an average particle diameter of 10 μm, and add B powder (average particle diameter at 100 nm) with a Ti molar ratio of 1:2, the amount of B powder added is 0.1% of the mass of W powder, and 5% of the mass of W powder. Copper powder (with an average particle size of 10 μm) was induced and mixed on a V-type mixer at 80 r / min for 4 hours. After mixing, a hydraulic press was...

Embodiment 2

[0043]Put the cleaned Ti sheet (thickness 1.2mm) and Cu block from bottom to top into the vacuum induction melting furnace in turn, wherein the amount of Ti used is 1.0% of the mass of Cu used, and then vacuumed to 4×10 -3 Above Pa, fill a small amount of argon protective gas and start smelting. First, the current is increased to 20A at 2A / min, the temperature is raised to 1100°C and kept for 5 minutes, and then the current is raised to 28A, the temperature is 1350°C, kept for 25 minutes, and cooled with the furnace to obtain a CuTi alloy. Weigh W powder with an average particle size of 15 μm, and add B powder (average particle size at 200nm) with a Ti molar ratio of 1:2, the amount of B powder added is 0.3% of the mass of W powder, and 8% of the mass of W powder Copper powder (with an average particle size of 20 μm) was induced and mixed on a V-type mixer at 50 r / min for 8 hours. After mixing, it was pressed and formed by a hydraulic press to obtain a W compact. The pressing...

Embodiment 3

[0045] Put the cleaned Ti sheet (thickness 1.5mm) and Cu block from bottom to top into the vacuum induction melting furnace in turn, wherein the amount of Ti used is 2.0% of the mass of Cu used, and then vacuumed to 4×10 -3 Above Pa, fill a small amount of argon protective gas and start smelting. Firstly, the current is raised to 24A at 2A / min, the temperature is raised to 1110°C and kept for 6 minutes, and then the current is raised to 26A, the temperature is 1400°C, kept for 28 minutes, and cooled with the furnace to obtain a CuTi alloy. Weigh W powder with an average particle size of 8 μm, and add B powder with a Ti molar ratio of 1:2 (average particle size is 300nm), the amount of B powder added is 0.5% of the mass of W powder, and 7% of the mass of W powder The induced copper powder (with an average particle size of 30 μm) was mixed on a 60r / min V-type mixer for 6 hours, and after mixing, it was pressed and formed by a hydraulic press to obtain a W compact. The pressing ...

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Abstract

The invention discloses a titanium diboride reinforced CuW alloy in-situ synthesis method. The method comprises the steps of evenly mixing W powder, B powder and induced copper powder and conducting compression molding on the mixture to obtain a tungsten compact; putting the tungsten compact into an atmosphere sintering furnace for sintering to obtain a tungsten skeleton; putting a CuTi alloy on the tungsten compact and then putting the CuTi alloy and the tungsten compact into a graphite crucible paved with graphite paper, conducting infiltration in the sintering furnace to obtain the in-situsynthesis titanium diboride reinforced CuW alloy. According to the method, a ceramic phase TiB2 is generated in a CuW material in situ through the sintering-filtration method. In the presence of the low-work-function ceramic phase, electric arcs are effectively dispersed, so that the electric arc ablation resistance of a CuW contact material is improved.

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 titanium diboride 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 larger capacitance, the arc heat is more concentrated, which ...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C32/00C22C27/04H01H1/021
CPCC22C1/058C22C27/04C22C32/0073H01H1/021
Inventor 杨晓红赵伊鹏邹军涛梁淑华肖鹏
Owner XIAN UNIV OF TECH
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