Preparation and Characterization of the Coated ZrB2 @ ZrO2 Ceramic
In this work, ZrB2 powder coated with ZrO2 (ZrB2 @ ZrO2) were applied to promote the densification of ZrB2 prepared by pulsed electric current sintering (PECS). The coating process and sintering behavior were investigated. While the pH value was about 9, the ZrB2 particles were successfully coated with ZrO2 by co-precipitation methods. The thickness of ZrO2 layer was about 3-5nm. The coated powder was sintered at 1600°C ~1950°C by PECS in vacuum. For comparison, the pure ZrB2 powder was sintered at the same conditions. The relative density of the sample coated with ZrO2 was 97.8% at PECS 1950°C, which was higher than that of sample without coating. The densification process can be divided into three stages. The ZrO2 coating layer plays an important role on the densification of ZrB2.
Takashi Goto, Yibing Cheng, Zhengyi Fu and Lianmeng Zhang
J. R. Song et al., "Preparation and Characterization of the Coated ZrB2 @ ZrO2 Ceramic", Advanced Materials Research, Vol. 66, pp. 226-229, 2009