Microstructure and Reactions of SiCw‐Reinforced Alumina with Ag‐Cu‐In‐Ti

Abstract

Brazing experiments were performed at 750°C for 2 h between Ag–Cu–In–Ti alloy and SiCw/Al2O3. The first clearly nonbraze layer consists of an oxide layer of metallic composition 33Ti–31Al–22Cu–14Si. Areas adjacent to the SiC whiskers were of different composition. A thin, continuous layer on the alumina portion of the composite appears to be γ‐TiO. The SiC whiskers are preferentially consumed and undergo reductions in diameter of approximately 40%. Observed “knobby” whisker morphologies may be related to SiC stacking faults, η‐type phases detected near the Ag–Cu eutectic portion of the joint appear to consist of Ti‐Cu‐Al‐Si‐O and Ti3Cu3O.