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The surface layer of a newly manufactured vacuum switch with two-phase composition contacts, e.g., Cu+2-percent Bi or Cu+2-percent Te, exhibits a strong arc stability behavior, which tends to decrease with the erosion of the surface layer. In comparison, unalloyed metals, Cu or W, and single-phase compositions, Cu2Te, show a homogeneous arc stability behavior.
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E. A. Attia (1973) studied this question.
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