Effect of Adding Phase on the Properties of ZrB_2 Based Ultra-high-temperature Ceramics

摘要

ZrB_2 belongs to a class of ceramics defined ultra-high-temperature ceramics with extremely high melting temperatures. To make ZrB_2 ceramics possess the high relative density and the better oxidation resistance. The results show YAG and Al_2O_3 help for the densification of ZrB_2 based ceramics. The oxidation layer thickness of sintered ceramics adding YAG or YAG-Al_2O_3 phase is thinner than that of sintered pure ZrB_2 ceramics under the same oxidation condition, the oxidation layer thickness of sintered ceramics adding YAG-Al_2O_3 phase is thinner than that of sintered ceramics adding YAG phase, the oxidation layer thickness of sintered ceramics is decreased with an increased Al_2O_3 content.