YU Hui, LUO Linghong, SHI Jijun, CHENG Liang, SUN Liangliang

(Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China)

Abstract: In general, a dosage of less than 5wt.% talc in alumina ceramic can help fluxing, but in magnesia porcelain the talc dosage is 65wt.% ~ 75wt.%. It can generate evenly dispersed protoenstatite and cordierite grains and thus dispersion strengthening the porcelain body. In the experiment, the effects of the talc dosage on the sintering properties and flexural strength of alumina porcelain sintered at 1330 ℃ were studied, and the phase composition of high strength aluminum porcelain was analyzed through XRD. Results show that when sintered at 1330 ℃, a dosage of 15wt.% talc not only produced very good fluxing effect, but also reacted with the porcelain body and generated in it evenly-distributed tiny protoenstatite particles, which could reinforce the porcelain body and improve the mechanical properties of alumina porcelain.

Key words: talc; alumina porcelain; dispersion strengthening