Manufacturing method of high-Te-content CuCr contact

Abstract

The invention discloses a manufacturing method of a high-Te-content CuCr contact. The manufacturing method of the high-Te-content CuCr contact mainly comprises the following steps that S1, CuCr(25-50)alloy blocks, Cu blocks and CuTe(10-50) alloy blocks are prepared and selected to be reserved; S2, the matched CuCr(25-50) alloy blocks and the matched Cu blocks are put into a crucible, the CuTe(10-50) alloy blocks are put into a secondary feeding device, and then a vacuum system is opened; S3, gradient heating operation is conducted until the Cu blocks begin to melt, the vacuum system is closed, and argon is fed into the crucible; S4, the situation that the CuCr(25-50) alloy blocks and the Cu blocks completely melt is observed, molten alloy liquid is evenly stirred, and then the CuTe(10-50)alloy blocks are put into the molten alloy liquid; S5, the molten alloy liquid can flow to a crucible opening, and the temperature of the crucible opening is increased; S6, casting operation is conducted so that the molten alloy liquid can flow into a water-cooled copper mold; and S7, machining operation is conducted according to the drawing requirement. According to the manufacturing method of the high-Te-content CuCr contact, the intermediate alloy block addition mode is adopted by the technology, the smelting temperature is reduced, the Te addition uniformity and the Te addition yield areguaranteed, the crucible washing frequency is reduced, and the number of metallographical inclusions is reduced.

Description

technical field [0001] The invention relates to the technical field of alloy preparation, in particular to a method for preparing a CuCr contact with high Te content. Background technique [0002] As we all know, vacuum circuit breakers are responsible for closing, carrying and breaking current under normal circuit conditions in power systems, and can close, carry and break currents under abnormal circuit conditions within a specified time. The core components in the arc chamber, the contact plays an important role, and the vacuum interrupter has very strict requirements on the contact material; especially in the future, the State Grid’s requirements for the medium and high voltage vacuum switch tubes must be miniaturized and maintenance-free , long life, and full life, which makes the performance requirements of the contact material higher. [0003] CuCr contacts produced by existing processes (vacuum casting, infiltration, arc melting, powder metallurgy) may still fail to...

AI Technical Summary

Problems solved by technology

[0003] CuCr contacts produced by existing processes (vacuum casting, infiltration, arc smelting, powder metallurgy) may still fail to break due to high cut-off value in practical applications, or the contacts cannot be disconnected by welding.

[0004] Although on the basis of the existing vacuum induction melting, by adding metal Te, a brittle phase is formed, which improves the welding resistance of the contact and reduces the cut-off value, but due to the low boiling point of Te, it is very volatile during the melting process, so its collection The yield is extremely low, and the addition of Te in the existing process is ≤0.3%, which cannot fully play the role of metal Te, and the addition of Te accelerates the crucible’s shedding, resulting in metallographic inclusions in the contact material, shortening the life of the crucible, and increasing production costs. ; Therefore, a new method for preparing CuCr contacts with high Te content is needed to solve the above problems

Images