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Making copper chromium alloy vacuum contact material with improved, anisotropically-directed properties, employs sintering, impregnation and directed deformation
Making copper chromium alloy vacuum contact material with improved, anisotropically-directed properties, employs sintering, impregnation and directed deformation
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机译：通过烧结，浸渍和定向变形来制造具有改善的各向异性定向特性的铜铬合金真空接触材料
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摘要
Chromium powder, alone or as a mixture, and with the required final weight of chromium, is mixed with copper powder, its weight being 5-15 wt% deficient in comparison with the copper content of the final contact material. Pressing takes place at 200-1000 MPa, forming a porus blank having 75%-90% of the theoretical density. This is coated with sufficient copper to make up the deficit. In high vacuum, heating takes place to or above the melting point of copper, sintering to a chromium- or copper-chromium matrix, impregnated with copper from the coating. At this stage the copper content is increased beyond that of the pressing and the density is 96%-98% of theoretical. Deformation by at least 30%, during extrusion with directed extension follows, drawing the chrome to filaments in the direction of extension, to form a directed structure. The unfinished contact blank material then has at least 99%, especially 99.5%-99.9 %, of the theoretical density. An INDEPENDENT CLAIM is included for the corresponding contact component. Its tensile strength and electrical conductivity parallel to extension are each at least 10% greater than in the transverse direction.
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