SU561459A1 - Material for vacuum circuit breaker contacts - Google Patents

Description

one

The invention relates to the field of electrical equipment, in particular, to vacuum switching devices and can be used in the manufacture of contacts.

Contact materials are known which contain a skeleton of a powder of a refractory material. Such materials provide high erosion resistance l. At the same time, the refractory skeleton is impregnated with copper with the addition of antimony, bismuth, aluminum. However, such materials do not provide a high breaking capacity of vacuum arcing chambers.

Also known materials that provide low wear and high breaking capacity.

These materials contain a skeleton of metal powder with a melting point lower than that of molybdenum, but greater than that of copper. The said skeleton is impregnated with a material having a melting point lower than that of the skeleton, for example, copper-based alloys 2. Examples of such materials are iron-copper, cobal, copper, iron-copper-zirconium, etc. However, contacts from these materials have a high transition resistance. This is due to the fact that the skeleton metal in such materials is dissolved in the impregnating material. As a result, even when a metal with a high electrical conductivity (for example, copper) is chosen for impregnation, the electrical conductivity of the material is much lower than that of the impregnating metal. Impurities of the metal of the skeleton greatly reduce the electrical conductivity of the impregnating material. If a metal with a high electrical water content (copper, silver) is introduced only by impregnating the skeleton, the electrical conductivity of these materials is much less than that of copper, and the contact resistance of the contacts made of these materials is much greater than copper.

Claims (2)

The subject of the invention is a contact material, free from the indicated deficiency and possessing high indicators in terms of transient resistance, erosion resistance and breaking capacity. In the proposed material, low transient resistance and high arc resistance is achieved by the fact that the skeleton consists of at least 30-60% of its core from metal powder with a high elec. conductivity. The proposed metal, as well as the known one, contains a skeleton of metal powder with a melting point of not more than 2500 s and with a boiling point of less than 1000 ° C. In this case, the pores of the skeleton are impregnated with a material having a melting point lower than that of the skeleton, for example, copper or its alloys. The skeleton of the contact material may consist of cobalt or iron in the amount of 40-50% and copper in the amount of 50-60%. Such a contact material provides a small transitional resistance, commensurate with the transitional resistance of copper contacts, and high erosion resistance. During the impregnation of the skeleton with copper-based alloys, the copper powder that the skeleton partly consists of does not dissolve noticeably in the impregnating alloy and the inclusion of copper powder provides a small contact resistance of the contacts from the proposed material. with a melting point of no more and a boiling point of less than 3000 ° C, which is impregnated with a material having a melting point lower than the metals of the skeleton, for example an alloy edi, l and m of h and Yusch and with the fact that, in order to reduce the transitional resistance contacts and increasing the arc resistance of the skeleton consists of at least 30 to 60% of its weight of metal powder with high electrical conductivity. 2. The material according to claim 1, which is also distinguished by the fact that the skeleton consists of copper in the amount of 50-60%, the rest is cobalt. 3.Material according to claim 1, differing in u-, ui and u with the fact that the skeleton consists of copper in the amount of 50-60%, the rest is iron. Sources of information taken into account in the examination: 1. US Patent 2975255, class 200-144, 1971. 2. The patent of England 1194674, kl.N2 V, 1973.