Effect of YAG Content on the Properties of YAG–ZrB₂ Ceramics

Abstract

ZrB₂ belongs to a class of ceramics defined ultra-high-temperature ceramics (UHTCs) with extremely high melting temperatures, but ZrB₂ ceramics are difficult for densification. To make high relative density and good high-temperature property ZrB₂ ceramics, in this article, the effect of YAG content on the property of YAG–ZrB₂ multiphase ceramics is investigated. The sintering shrinkage is increasing with the increasing of the YAG content from 10% to 40%. The relative density increases with the increase of the YAG content from 10% to 40%, but the rate of increasing relative density from 10% to 30% is higher than that of 40%. When the content of YAG is higher than 30%, fracture toughness increases a little. The YAG content is more, and the weight gain is less, which shows that the oxidation layer thickness is thinner.

Keywords:

• Content
• Oxidation
• Relative density
• Sintering
• Ultra-high-temperature ceramics
• YAG
• ZrB₂

ACKNOWLEDGMENTS

The authors are thankful for the financial support provided by the National Science Foundation of China, and for the apparatus provided by The Center for Materials Test of Wuhan University of Technology, China.