Patent ID: 6131796
Filing Date: 2000-10-17
Classification: B23K

Abstract:
A process for brazing a refractory metal article to a metal object comprising the steps ofproviding a metal article, comprising at least one refractory metal, and a metal object;disposing a braze alloy comprising a copper-silver-nickel alloy between said metal article and said metal object;heating said metal article, said metal object, and said braze allow in a first pre-bond heating cycle; andheating said metal article, said metal object, and said braze alloy in a second braze heating cycle to a temperature for a time sufficient to braze said metal article to said metal object, wherein the nickel component of said braze alloy is drawn to and reacts with said refractory metal to form a nickel-rich interface layer, and wherein said braze alloy is a copper/silver eutectic composition alloy with about 4 weight percent nickel and said first pre-bond heating cycle is performed at about 840.degree. C. for about 5 to about 10 minutes and said second braze heating cycle is performed at greater than about 840.degree. C. for about 5 to about 10 minutes.