预加方石英粒度对SiO2基陶瓷型芯性能的影响

方石英作为高温增强相加入到SiO2基陶瓷型芯的基体材料中,以热压注法制备SiO2基陶瓷型芯,研究了预加方石英粒度对SiO2基陶瓷型芯性能的影响。分析了方石英粒度对SiO2基陶瓷型芯孔隙度和高温抗蠕变性能的增强机理。结果表明,随着方石英粒度减小,SiO2基陶瓷型芯的显气孔率逐渐增大,室温抗弯强度和高温挠度逐渐降低。当方石英粒度为13μm时,SiO2基陶芯的显气孔率达到最大值、高温挠度达到最小值,分别为42.30%和0.14mm。

Effects of Particle Size of Pre-added Cristobalite on the Properties of SiO Based Ceramic Cores

Cristobalite was added as a high-temperature reinforcing phase to the matrix material of the SiO2-based ceramic core prepared by hot pressure injection.The influence of the particle size of pre-added cristobalite on the performance of SiO2-based ceramic cores was investigated.The enhancement mechanism of cristobalite particle size on the porosity and high temperature creep resistance of SiO2-based ceramic cores was analyzed.The results indicate that the apparent porosity of the SiO2-based ceramic core is gradually increased as the particle size of cristobalite decreases,and the room temperature bending strength and high temperature deflection are gradually decreased.When the particle size of cristobalite is 13μm,the apparent porosity of the SiO2-based ceramic core reaches the maximum value,and the high temperature deflection reaches the minimum value,which are 42.30% and 0.14 mm,respectively.