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Gradient composite copper-chromium contact material and preparation method thereof

A copper-chromium contact and gradient technology, which is applied in the field of gradient composite copper-chromium contact materials and their preparation, can solve the problems of surface cracks, material falling off and switch, failure, etc. of copper-chromium materials, so as to improve heat dissipation performance and improve dielectric recovery. performance, effect of reducing loop resistance

Inactive Publication Date: 2015-12-30
SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] However, due to the uniform composition of the traditional copper-chromium contact material, the thermal conductivity, bonding strength and electrical properties of the copper-chromium contact cannot be significantly improved.
Failure to dissipate heat in a timely manner during the breaking process results in a large thermal stress inside the material, causing cracks on the surface of the copper-chromium material, and eventually causes part of the material to fall off and cause the switch to fail

Method used

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  • Gradient composite copper-chromium contact material and preparation method thereof
  • Gradient composite copper-chromium contact material and preparation method thereof
  • Gradient composite copper-chromium contact material and preparation method thereof

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] A gradient composite copper-chromium contact material, which is mainly composed of CuCr50 layer and CuCr1 layer, the composition of CuCr50 layer is: Cr content 45-55%, Cu balance; CuCr1 layer composition is: Cr The content is 0.6-2.1%, and the balance of Cu; the raw materials are respectively 65-200 micron Cr powder and 100 micron Cu powder.

[0041]The chromium powder is electrolytic chromium powder or thermite reduced chromium powder, and the copper powder is electrolytic copper powder or atomized copper powder.

[0042] The purity of the chromium powder is 99.3%-99.98%.

[0043] In addition, the preparation method of the gradient composite copper-chromium contact material includes the following steps:

[0044] (1) Raw material selection

[0045] Choose 65-200 micron chromium powder and 100 micron copper powder;

[0046] (2) mixed ...

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Abstract

The invention relates to a gradient composite copper-chromium contact material and a preparation method thereof. The gradient composite copper-chromium contact material is mainly composed of a CuCr50 layer and a CuCr1 layer. The CuCr50 layer comprises 45-55% of Cr with the balance being Cu by mass. The CuCr1 layer comprises 0.6-2.1% of Cr with balance being Cu by mass. The preparation method comprises the steps of raw material selection, powder mixing, compacting, infiltration and annealing. A product is improved based on the welding performance of a present copper-chromium contact material and the loop resistance. The infiltrated CuCr50 is prepared by a single-sheet infiltration technology, and the CuCr1 layer is formed by utilizing a designed temperature curve. An original contact composed of all CuCr50 is optimized into a contact composed of half CuCr50 and half of CuCr1, use of the strategic metal Cr is reduced, the loop resistance of the contact is reduced due to use of CuCr1, and the welding performance between the contact and a cup seat is improved.

Description

technical field [0001] The invention relates to a gradient composite copper-chromium contact material and a preparation method thereof, belonging to the field of metal-based composite materials. Background technique [0002] The electric contact is the contact element of the electrical switch, which is mainly responsible for the task of contacting and disconnecting the load current. The contact and arc extinguishing system are the heart of the switch. The safety, reliability and breaking and closing characteristics of the switch largely depend on the physical properties of the contact material and its electrical characteristics. Therefore, its performance directly affects the reliable operation of switching devices. Copper-chromium contact materials are widely used in various circuit breakers, vacuum load switches and transformer transfer switches because of their good arc erosion resistance, welding resistance and high strength. [0003] However, since the composition of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/04H01H11/04B22D23/04B22F1/00
CPCH01H1/04B22D23/04B22F1/0003H01H11/048
Inventor 王小军刘凯师晓云王文斌李刚郭创立赵俊
Owner SHAANXI SIRUI ADVANCED MATERIALS CO LTD
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