Encapsulated contact material and process for producing the same.

摘要

An encapsulated contact material comprising a substrate and a contact-coating layer formed on said substrate, characterized in that said contact-coating layer comprises at least one metal selected from a group consisting of Mo, Zr, Nb, Hf, Ta and W or an alloy made of two or more of these metals and containing from 0.5 to 10 atomic % of at least one element selected from a group consisting of Li, K, Ce, Cs, Ba, Sr, Ca, Na, Y, La, Sc, Th and Rb and has a thickness of 0.1 mu m or more; or comprises at least one metal selected from a group consisting of Mo, Zr, Nb, Hf, Ta and W or an alloy made of two or more of these metals and containing from 0.1 to 5 % by weight of at least one oxide comprising at least one metal selected from a group consisting of Li, K, Ce, Cs, Ba, Sr, Ca, Na, Y, La, Sc, Th and Rb and has a thickness of 0.1 mu m or more. This encapsulated contact material has a low contact resistance and an excellent arc resistance.