Joining of reaction-bonded silicon carbide using a preceramic polymer

摘要: Ceramic joints between reaction-bonded silicon carbide (RBSiC) were produced using a preceramic polymer (GE SR350 silicone resin) as joining material; samples heat treated in an argon flux at temperatures ranging from 800–1200°C without applying any pressure. The strength of the was determined by four-point bending, shear and indentation tests. Microstructural microchemical analyses performed optical microscopy, SEM, TEM AEM. room-temperature increased with temperature. Maximum values high 220 MPa bending 39 tests reached for joined 1200°C. No detectable residual stresses observed both material parts, fracture mechanism nearly always cohesive. joint thickness shown to depend on processing temperature, ranged about 2–7 μm. oxycarbide amorphous ceramic, no oxygen diffusion occurring this RBSiC parts. lack compositional gradients, precipitates or reaction layers indicate that SiOC ceramic acted inorganic adhesive, involved direct formation chemical bonds parts material. © 1998 Chapman & Hall