Effect of SiO2 Micro-Powders on the Properties of Alumina-Based Ceramic Core

摘要

The influence of added quantity of SiO_2 micro-powder on ceramic core properties was investigated in this paper. The results show that, the quantity of added SiO_2 powder has significant effect on the properties of ceramic core, and the room temperature flexural strength of ceramic core samples, sintered at 1550°C for 4~5 hours' holding time, increases with the increasing quantity of SiO_2. The room temperature flexural strength can reach 35MPa, when the amount of SiO_2 powder is 15%. The XRD results show that new mullite phase was detected in the composite material, and that is the key factor that helps to increase the strength.