A Brief Introduction Of 10 Sintering Processes For Alumina Ceramics-10

10. High vacuum sintering

High vacuum sintering is a kind of sintering technology for ceramic billet under high vacuum.Vacuum sintering has attracted much attention in the preparation of low-porosity and small-size grain ceramics due to its advantages such as reducing heating rate, inhibiting abnormal grain growth and reducing irregular porosity.

High vacuum sintering can not only improve some properties of high purity alumina ceramics, but also reduce impurities at grain boundary and pores in the sintered body.In the process of preparing high-purity alumina ceramics by vacuum sintering, oxygen ions in alumina lattice are easy to be lost, forming a large number of oxygen ion vacancies, and the concentration of aluminum ion is relatively increased, which leads to the acceleration of aluminum ion diffusion process, which is conducive to sintering.