Research on pressureless sintering of Al2O3/SiC nanocomposite ceramics

Two different kinds of nano-sized SiC particles and two kinds of Al2O3 were used to prepare Al2O3/SiC nanocomposite ceramics through pressureless sintering (sintering temperature 1 650degreesCsimilar to1 750degreesC) and HIP(1 450degreesC, 180 MPa). Comparing sintering results of different samples, the coarser/coarser powder combination was found out to benefit densification most. At the same time, the impact of different sintering additives on the samples has been studied, and it can be concluded that composite additive is more effective than the single one. When adding 1.5% dual additives, the relative density of the sample increased to 99.4%.