Process for making a brazed lead electrode, and product thereof

Details Process for making a brazed lead electrode, and product thereof Process for making a brazed lead electrode, and product thereof

H - Electricity

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356/172

H01L 21/441 (2006.01) B32B 15/20 (2006.01) H01L 21/60 (2006.01) H01L 23/051 (2006.01) H01L 23/31 (2006.01)

Patent

CA 1057421

Abstract of the Disclosure This relates to a process for making a brazed lead electrode work- piece, and such workpiece. The process for attaching a lead member to a con- tact member comprises initially providing a lead member formed substantially of a thermally and electrically conductive metal and terminating at one end in a joining surface, and an axially extending contact member formed substan- tially of a refractory metal and terminating in a joining surface of such refractory metal. The joining surfaces of the members are placed in contact with a silver/copper-based brazing alloy having a wetting point of at least 450 C. The brazing alloy is then heated (preferably in an inert atmosphere at atmospheric pressure) at least to its wetting point for a period of time sufficient to melt the brazing alloy. Thereafter the molten brazing alloy is allowed to cool and solidify in contact with the joining surfaces of the mem- bers, thereby to join the contact member and the lead member into a unitary structure. The workpiece comprises an axially extending contact member formed substantially of a refractory metal and terminating at one end in a joining surface, a lead member formed substantially of a thermally and electrically conductive metal and terminating at one end in a joining surface, and a brazing alloy disposed between and securing together the joining surfaces of the members, thereby to join the members into a unitary structure.

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