T. König, M.C. Galetz, B. Albert
Journal of the European Ceramic Society 41 (2021), 101-112, DOI: 10.1016/j.jeurceramsoc.2021.09.027
The potentials and limitations of a halide-activated pack cementation process on SiC/SiCfor the development of bond coats as part of environmental barrier coating (EBCs) systems were investigated. Different pack compositions using chromium, aluminum and alloys of these elements were tested and the kinetics of coating formation were examined in addition to their . The results and their analogy to diffusion couples were discussed and it was shown that coating elements which form and are promising candidates for coatings deposited on SiC/SiC via pack cementation. Based on such considerations a two-step pack cementation was proposed, which used chromium, one of the suitable elements, in a first step, to finally achieve an alumina-forming coating. The of the developed coating was tested via and compared to the uncoated material. The coating protected the fiber-matrix interface of the SiC/SiC Ceramic Matrix Composites from oxidation.