ZrB2 及其复合陶瓷的高温抗氧化性能

综述了ZrB_2及其复合陶瓷的高温氧化行为,认为ZrB_2陶瓷是一种优异的高温结构材料,其氧化失效是由于氧化产物B_2O_3保护层挥发失效而导致的;二元陶瓷ZrB_2-SiC由于SiC的加入,高温抗氧化性能大大提高,并对其在不同温度下的氧化物结构进行了阐述。在此基础上提出了进一步提高ZrB_2-SiC陶瓷抗氧化性能和服役温度的方法,并以添加TaC和LaB_6形成三元复相陶瓷为例进行了说明。

High Temperature Oxidation Resistance of ZrB2 and Its Composites

In this paper, the oxidation behaviors of ZrB2 and its composites were reviewed. The results shown

that the ZrB2 ceramic is one of the promising high-temperature structure materials. The failure of ZrB2 ceramic was

due to the volatile and failure of B2O3 protective layer. For the ZrB2 -SiC composite ceramic, its antioxidant property

was improved at high temperatures by the addition of SiC. Also, the oxide structures of ZrB2 -SiC ceramic at different

temperatures were described in detail. Based on these discussions, a new way for further improving oxidation resistance

and service temperature of ZrB2 -SiC ceramic was described and illustrated by addition of TaC and LaB6 to form

ternary composite ceramics.