Advanced Brazing Methods for Assembly of Superalloy Based Parts

Abstract

René 108 is a nickel-based superalloy commonly used in gas turbines and other applications where high mechanical strength is need at high temperatures. Wide-gap brazing is commonly used to repair in-service parts to extend their life span. Recently wide-gap brazing has been investigated as a means to decrease the amount of original equipment manufacturing (OEM) waste. Since superalloys are very expensive, waste minimization has significant economic advantages. This research characterizes the isothermal spreading of a brazing paste composed of 40% BNi-2 and 60% MARM-247 on René 108 in a vacuumed brazing furnace for two holding times at three different temperatures (1201º C, 1229º C, 1243º C). The best wetting action was found to occur at 1243º C with a 20 min hold time.