Effect of Boron Carbide on Properties of Silicon-Based Ceramic Core
Silicon-based ceramic cores with different contents of boron carbide were prepared by hot-pressing injection method with quartz glass powder as raw material.The effect of boron carbide with different contents on crystallization and properties of silica ceramic cores was investigated.The experimental results indicated that with the increase of boron carbide contents,the shrinkage rate and bulk density of the sample gradually increased,and the porosity gradually decreased.The room temperature and high temperature of bending strength increased first and then decreased with the increase of boron carbide content,and the high temperature deflection decreased first and then increased.When the contents of boron carbide is 0.3wt.%,the comprehensive properties of the ceramic core are greatly improved,with shrinkage rate of 1.44%,the bulk density of 1.67 g/cm3,the porosity of 25.51%,bending strength of 16.32 MPa at room temperature,bending strength of 33.2 MPa at high temperature,and high temperature deflection of 0.19 mm.
国家科技期刊平台
NSTL
万方数据
