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A kind of process method of surface layer modification of copper-chromium alloy

A process method, copper-chromium alloy technology, applied in the direction of metal material coating process, coating, etc., can solve problems such as damage to contact performance, difficult contact use, Cr segregation, etc.

Active Publication Date: 2015-12-09
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is carried out under non-vacuum conditions, it is difficult to avoid the oxidation of CuCr alloy contacts. At the same time, because the surface of the contacts is coated with light absorbing agent (used during melting), and CuCr alloy powder is mixed with binder (used during cladding), Therefore, in the process of laser melting or cladding, not only the CuCr alloy cannot be purified, but also other impurities will be brought into it, which will damage the performance of the contact and bring unpredictable risks to the use of the contact.
The Chinese patent "CN101899640B" proposes a method of pre-coating Cr on the Cu substrate and then alloying it with a pulsed electron beam. This method has the problems of inconsistent Cr content and Cr segregation in the alloyed alloy layer.
So far, there is no alloying treatment of CuCr alloy by vacuum electron beam welding technology.

Method used

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  • A kind of process method of surface layer modification of copper-chromium alloy
  • A kind of process method of surface layer modification of copper-chromium alloy
  • A kind of process method of surface layer modification of copper-chromium alloy

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Experimental program
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Effect test

Embodiment 1

[0038] 1) The chromium content of 40% mass fraction of tungsten added with 1.5% mass fraction is prepared by powder sintering method 74mm×5mm CuCr (40) blank; install the prepared CuCr (40) alloy blank on the matching fixture on the CNC workbench in the welding room, the matching fixture is cooled by circulating water, vacuumize and keep the welding room vacuum degrees at 8×10 -1 Pa-1×10 -3 Pa range;

[0039] 2) Set welding parameters: high voltage 60kV, welding current starting at 30mA and then gradually increasing to 50mA at a constant speed, welding speed starting at 6mm / s and then gradually increasing to 15mm / s at a constant speed, welding seam lap rate 30% , according to the setting program of the spiral path from the middle to the periphery, start the electron beam welding machine, and carry out the electron beam automatic melting treatment on the upper surface of the CuCr (40) alloy blank;

[0040] 3) Use a hydraulic press with a nominal pressure of 315 tons, and th...

Embodiment 2

[0042] 1) The powder sintering method is used to prepare 1.0% mass fraction of tungsten, 1.5% mass fraction of molybdenum, and the chromium content is 40% mass fraction. 74mm×5mm CuCr (40) blank; install the prepared CuCr40 alloy blank on the matching fixture on the CNC workbench in the welding room, the matching fixture is cooled by circulating water, vacuumize and keep the vacuum degree of the welding room at 8×10 -1 Pa-1×10 -3 Pa range;

[0043] 2) Set welding parameters: high voltage 30kV, welding current starting at 50mA and then gradually increasing to 80mA at a constant speed, welding speed starting at 6mm / s and then gradually increasing to 20mm / s at a constant speed, welding seam lap rate 40% , according to the setting program of the spiral path from the middle to the periphery, start the electron beam welding machine, and carry out the electron beam automatic melting treatment on the upper surface of the CuCr (40) alloy blank;

[0044] 3) Use a hydraulic press with...

Embodiment 3

[0046] 1) The chromium content of 1.0% by mass fraction of tungsten, 1.5% by mass fraction of molybdenum, 0.5% by mass fraction of iron, 1.5% by mass fraction of zirconium, and 1.5% by mass fraction of nickel was prepared by powder sintering method. quality score 74mm×5mm CuCr (50) blank; install the prepared CuCr (50) alloy blank on the matching fixture on the CNC workbench in the welding room, the matching fixture is cooled by circulating water, vacuumize and keep the vacuum degree of the welding room at 8×10 -1 Pa-1×10 -3 Pa range;

[0047] 2) Set welding parameters: high voltage 40kV, welding current starting at 40mA and then gradually increasing to 60mA at a constant speed, welding speed starting at 8mm / s and then gradually increasing to 20mm / s at a constant speed, welding seam lap rate 35% , according to the setting program of the helical path from the middle to the periphery, start the electron beam welding machine, and carry out the electron beam automatic melting ...

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Abstract

The invention discloses a technological method for modifying a copper-chromium alloy surface. The technological method comprises the following step of carrying out surface melting treatment on a CuCr alloy by adopting vacuum electron beam welding equipment, thus forming a compact working layer on the surface of a copper-chromium alloy contact, wherein the working layer is high in purity and has fine microstructural Cr particles.

Description

technical field [0001] The invention relates to a copper-chromium alloy contact material, in particular to a process method for modifying the surface layer of the copper-chromium alloy. Background technique [0002] Copper-chromium alloy (hereinafter, CuCr is used instead of copper-chromium, and the commonly used Cr content is 20%-50% mass fraction, the same below) is mainly used as the contact of vacuum circuit breaker, which plays the role of connecting, carrying and breaking current. The heart part of the vacuum circuit breaker, its performance determines the performance of the vacuum circuit breaker and its operation reliability to a large extent. Therefore, vacuum circuit breakers have very strict requirements on contacts, which require: ① large breaking current capacity; ② high withstand voltage strength; ③ good electrical and thermal conductivity; ④ high anti-welding ability; Arc burning ability; ⑥ low cut-off value characteristics; ⑦ low impurity content. At presen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C26/00C23C24/10
Inventor 陈名勇颜培涛林毓黄国伟张宏浪叶凡
Owner 桂林金格电工电子材料科技有限公司