Study on the effect of boron carbide on the performance of silicon-based ceramic cores

Study on the effect of boron carbide on the performance of silicon-based ceramic cores
Using quartz glass powder as the base material, adding 0 to 1wt.% boron carbide as the mineralizing agent, a silicon-based ceramic core was prepared by hot pressing. The effects of different boron carbide contents on the comprehensive performance of the silicon-based ceramic core were studied. The impact test results show that as the boron carbide content increases, the shrinkage rate and volume density of the sample gradually increase, and the porosity gradually decreases. It increases and then decreases, and the high temperature deflection first decreases and then increases; when the boron carbide content is 0.3wt.%, the comprehensive performance of the ceramic core is improved, the shrinkage rate is 1.44%, the volume density is 1.67 g/cm3, and the porosity reaches 25.51%. The previous resistance The flexural strength is 16.32 MPa, the high-temperature flexural strength is 33.2 MPa, and the high-temperature deflection is 0.19 mm.