| 摘要 |
This relates to a process for making a brazed lead electrode workpiece, and such workpiece. The process for attaching a lead member to a contact 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 substantially 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 members, 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. |
