Behaviour of titanium in brazing SiC/SiC and SiC/stainless steel

The mechanism of joining of silicon carbide (SiC) to silicon carbide, and silicon carbide to stainless steel (SUS) using Ag-Cu Ti alloy is discussed. The behavior of Titanium(Ti) at the brazed joint of (SiC) and (SUS) at low and high temperatures, as well as the reaction products that appear and their probable effect on bonding, were examined. It was observed that brazing of SiC/SUS cannot be possible under the same heating condition as for brazing SiC/SiC, because lower temperatures favour SUS/SiC, bond, while high temperatures favour SiC/Alloy bond. Thus brazing SiC/SUS under either of the above-mentioned conditions will put both materials at a disadvantage in one way or the others. (author)