Mechanisms of wetting and brazing of silicon carbide by Cu-Si non reactive alloys for high temperature applications

摘要

Sessile drop experiments were carried out with a non reactive Cu 24 at % Si alloy on (alpha)-SiC single crystals and polycrystalline substrates under high vacuum or a commercial argon atmosphere. Experiments led to contact angles as low as 30 deg. and to a non reactive and strong interface. Wetting kinetics observed in this system has been identified to depend greatly on temperature and atmosphere. Brazing experiments were then performed using informations from sessile drop experiments. Influence of the brazing configuration is discussed. (author) 11 refs.