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Large-current circuit breaker contact and preparation method thereof

A circuit breaker, high current technology, applied in circuits, electrical switches, electrical components, etc., can solve problems such as strength reduction, high temperature softening, and large thermal expansion of chrome copper

Pending Publication Date: 2021-06-04
西安西电高压开关有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used arc contacts are mainly made of CuW / T2 and CuW / QCr0.5 alloy structures, while the contacts of CuW / QCr0.5 alloy structures are used in the contacts of high-current generator circuit breakers. During the experiment, it is obvious that the thermal expansion of the chromium copper part is large, the high temperature softens, and the strength decreases, so that it is difficult to pass the test

Method used

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  • Large-current circuit breaker contact and preparation method thereof

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preparation example Construction

[0019] The invention provides a method for preparing a contact of a large current circuit breaker, comprising the following steps:

[0020] Mix tungsten powder with butyl wax and nickel, and press to obtain a tungsten skeleton billet; the tungsten skeleton billet and copper rod are bonded, sintered, and machined to obtain a copper-tungsten alloy welding tip;

[0021] Aging treatment and machining of chromium-zirconium-copper solid alloy to obtain chromium-zirconium-copper alloy welding tail;

[0022] The copper-tungsten alloy welding tip and the chromium-zirconium-copper alloy welding tail are preheated, then electron beam welding and cold extrusion are performed to obtain a contact of a large current circuit breaker.

[0023] The method provided by the invention mixes paraffin wax, nickel and tungsten powder, changes the particle size distribution and increases the porosity of the tungsten powder, uses it as a tungsten skeleton billet, and then infiltrates copper to obtain a ...

Embodiment 1

[0040] Mix 1000g of tungsten powder with 26.5g of paraffin wax and 3g of nickel, and press to obtain a tungsten skeleton billet; the tungsten skeleton billet is bonded with 800g of T2 copper rod, sintered at 1350°C for 12 hours, and machined to obtain a copper-tungsten alloy welding tip;

[0041] Aging treatment of chromium-zirconium-copper solid alloy at 400-500°C for 2 hours, machining to obtain chromium-zirconium-copper alloy welding tail;

[0042] The non-welding seam of the copper-tungsten alloy welding head and the chromium-zirconium copper alloy welding tail is welded with a low-power electron beam welding voltage of 45V, welding at a welding beam current of 60mA for 38 seconds, preheating to 245°C, and then electron beam welding, The voltage of the electron beam welding is 85V, the beam current of the electron beam welding is 125mA, the focusing current of the electron beam welding is 520mA, and the time of the electron beam welding is 42s; 2.5 to 3 mm, after extrusion...

Embodiment 2

[0047] Mix 1000g of tungsten powder with 26.5g of paraffin and 3g of nickel, and press to obtain a tungsten skeleton billet; the tungsten skeleton billet and 792g of T2 copper rods are bonded and sintered at 1350°C for 12 hours, and machined to obtain a copper-tungsten alloy welding tip;

[0048] Aging treatment of chromium-zirconium-copper solid alloy at 400-500°C for 2 hours, machining to obtain chromium-zirconium-copper alloy welding tail;

[0049] The non-welding seam of the copper-tungsten alloy welding head and the chromium-zirconium copper alloy welding tail is welded with a welding voltage of 47V and a welding beam current of 59mA for 38 seconds, preheated to 250°C, and then electron beam welding, the electron beam welding The voltage of the electron beam welding is 84V, the beam current of the electron beam welding is 130mA, the focusing current of the electron beam welding is 535mA, and the time of the electron beam welding is 44s; then the electron beam welding produ...

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Abstract

The invention provides a high-current circuit breaker contact and a preparation method thereof. The method comprises the following steps: mixing and pressing tungsten powder, paraffin and nickel to obtain a tungsten framework blank; sintering and machining the tungsten framework blank and the copper rod after bining, and obtaining the copper-tungsten alloy welding head; performing aging treatment and machining on the chromium-zirconium-copper solid alloy, and obtaining a chromium-zirconium-copper alloy welding tail; preheating the copper-tungsten alloy welding head and the chromium-zirconium-copper alloy welding tail at low power through electron beam welding, performing welding through electron beam welding, performing cold extrusion, and obtaining the large-current circuit breaker contact. According to the method, paraffin, nickel and tungsten powder are mixed, particle size distribution is changed, the porosity of the tungsten powder is improved, the mixture serves as a tungsten framework blank, then copper is permeated, the prepared copper-tungsten alloy serves as a welding head, the chromium-zirconium-copper alloy subjected to aging treatment serves as a welding tail, an electron beam welding method is adopted, and the hardness of the obtained large-current circuit breaker contact at the welding seam is improved.

Description

technical field [0001] The invention belongs to the field of electrical contacts, in particular to a contact of a large current circuit breaker and a preparation method thereof. Background technique [0002] High-voltage electrical contacts are important components of high-voltage circuit breakers, switch cabinets, disconnectors, and grounding switches, and their performance directly affects the quality and service life of these high-voltage electrical appliances. [0003] The arc contacts currently used are mainly CuW / T2 and CuW / QCr0.5 alloy structures, while the contacts of CuW / QCr0.5 alloy structures are used in the contacts of high-current generator circuit breakers. During the experiment, it was obvious that the thermal expansion of the chromium copper part was large, the high temperature softened, and the strength decreased, which made it difficult to pass the test. Contents of the invention [0004] In view of this, the object of the present invention is to provide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/04H01H11/04B22F5/00B22F7/06
CPCH01H11/048H01H1/04B22F7/062B22F5/00
Inventor 刘天江刘强王海洪
Owner 西安西电高压开关有限责任公司
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