WETTING AND MECHANICAL CHARACTERISTICS OF THE REACTIVE AIR BRAZE FOR YTTRIA-STABILIZED ZIRCONIA (YSZ) JOINING

摘要

Reactive air brazing (RAB) technique was developed as an effective alternative for the joining of complicated ceramic parts. It was found that additions of CuO to silver exhibit a tremendous effect on both the wettabuity and joint strength characteristics of the subsequent braze relative to polycrystalline yttria-stabilized zirconia (YSZ) substrates. The wettabuity of Ag-CuO braze on YSZ was substantially improved with CuO contents in the observed range between 1 an 8 mol%. The corresponding bend strength of the brazed YSZ joints appearred to moderately increase with CuO content. The addition of a small amount of titanium also helped improve wettabuity, especially at the low CuO content, However, no corresponding substantial improvement was observed in the titanium-added braze.