Electrode contact member of vacuum circuit breaker and process for production of the same

Abstract

The invention provides an electrode contact member of vacuum circuit breaker which is obtained by forming a thick Cr fine dispersion layer on the surface of a Cu-Cr alloy base metal and which brings about improved dielectric strength and interrupting performance and a process for easy production of the member though easy formation of a Cr fine dispersion layer. The electrode contact member comprises a Cu-Cr alloy base metal (1) comprising 40 to 80wt% of Cu and 20 to 60wt% of Cr and a Cr fine dispersion layer (2) of 500mu m to 3mm in thickness formed on the surface of the base metal (1) through surface treatment by friction stir processing. The Cr fine dispersion layer (2) is subjected to surface flattening treatment prior to use.

Description

technical field [0001] The present invention relates to an electrode contact part of a vacuum circuit breaker and a manufacturing method thereof, in particular to an electrode contact part of a vacuum circuit breaker and a manufacturing method thereof which can prevent low withstand voltage, improve breaking performance, and are easy to manufacture. Background technique [0002] Generally, a vacuum circuit breaker 10 such as Figure 4 As shown in the structure, sealing parts 12 and 13 are sandwiched at both ends of a roughly cylindrical hollow member 11 made of insulating materials such as ceramics, and metal end plates 14 and 15 are fixed to form insulation. The inside of the insulating container constitutes a breaking chamber in a vacuum gas atmosphere. [0003] Arranged inside the breaker chamber: the fixed-side energizing conductor 16 penetrating the end plate 14 and airtightly fixed, and the energizing conductor 17 penetrating the movable side of the end plate 15, and t...

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Problems solved by technology

Moreover, the metal vapor generated by the arc during this process will contaminate the inner surface of the ceramic container constituting the insulating container of the vacuum circuit breaker, which has the disadvantage of reducing the life of the vacuum circuit breaker.

Moreover, there is a limit to the formation of a finely dispersed layer of Cr of 10-20 μm, and the electrode contact parts used for vacuum circuit breakers with voltages above 72kV have the problem of significantly lower withstand voltage as the number of times of opening and closing increases, which needs to be improved.

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