Effects of pyrolysis temperature and fillers on joining of ceramics via silicone resin
(Key Laboratory of Advanced Ceramic Fibers and Composites,
College of Aerospace and Materials Engineering,
National University of Defense Technology, Changsha 410073, China)
College of Aerospace and Materials Engineering,
National University of Defense Technology, Changsha 410073, China)
Abstract: The joining of graphite, ceramic SiC and Cf/SiC composites via preceramic silicone resin(SR) at high temperature (800-1400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and active fillers were especially discussed. The results show that the curing process of SR was accomplished by consuming Si—OH. The temperature of 1200℃ is the appropriate treating temperature for graphite and SiC ceramic, and the temperature of 1400℃ is suitable for Cf/SiC composites. Inert filler SiC powder(5%, mass fraction) has much positive influence on the shear strength of the joints. Active filler nano Ai, Si powder can greatly improve the properties of the joints treated at high temperature. The improvement is over 700%.
Key words: preceramic; silicone resin; pyrolysis temperature; inert filler; active filler; joining