| 摘要 |
<p>PCT No. PCT/DE89/00344 Sec. 371 Date Dec. 2, 1991 Sec. 102(e) Date Dec. 2, 1991 PCT Filed May 31, 1989 PCT Pub. No. WO90/15425 PCT Pub. Date Dec. 13, 1990.To produce CuCr contact materials, it is known to use purely powder-metallurgical, sinter impregnation and smelt-metallurgical processes. Only materials produced by smelt-metallurgical processes are suitable as contact materials for vacuum contactors based on copper-chromium. According to the invention, a contact material for vacuum contactors consisting essentially of copper (Cu) and chromium (Cr) in the proportion of 50 to 70% wt. Cu and 30 to 50% wt. Cr is manufactured by pressing and sintering a powdered mixture of the components until a closed porosity is attained and by subsequently cold working the sintered body. It has been possible to demonstrate that an intimate and faultless bonding of the components Cu and Cr is obtained by cold welding the structural constituents with this process as with smelting.</p> |
