Effects of Sintering Techniques on the Microstructure and Performance of High Purity Beryllium Oxide Ceramics

The effects of traditional, multistep and two-step sintering technique on the microstructure and performance of high purity beryllium oxide ceramics were investigated. It was found that the grain size of 99BeO ceramics could be controlled by the multistep sintering method, and the thermal conductivity could be elevated via two-step sintering method. Moreover, the technique parameters of the twostep sintering method, such as the highest sintering temperature (T1), the final sintering temperature (T2) and holding time (t),were studied in detail. The results show that under the condition of T1=1630℃, T2=1550℃ and t=4h, 99 BeO oxide ceramics owing fine grain and compact structure were obtained with the thermal conductivity of 308W/(m·K), and the density of 2.95g/cm3.