Effect of sintering process on properties of transparent alumina ceramics

Abstract

Abstract: Using Isobam600AF as dispersant and Isobam104 as adhesive, transparent alumina ceramics were prepared by improved two-step sintering method using gelcasting process and vacuum pressureless sintering technology. The effects of different sintering temperatures and holding time on the grain size, density, optical and mechanical properties of alumina ceramics were investigated. The results showed that the sintering process can control the growth of grain sizes and improve the relative density of ceramics effectively, so as to improve their optical properties and mechanical properties. During the sintering process, when the temperature rise to a certain range, the densification process start, and the densification rate first increase and then decreases with the increase of temperature and holding time. The densification rate reaches the fastest value in the condition of the second sintering step holding at 1 400 ℃ for 3 hours. Therefore, the densification of the green body is a nonlinear process with a maximum densification rate temperature and holding time point.

Key words: transparent alumina ceramic, sintering process, grain size, optical properties, mechanical properties

CLC Number:

TB321

HUANG Guo-wei, LI Ting, SUN Li, DI Zheng-xian, FAN Heng-zhong. Effect of sintering process on properties of transparent alumina ceramics[J]. Journal of Lanzhou University of Technology, 2022, 48(6): 8-15.

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