期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 38, 期 16, 页码 5311-5318出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.07.041
关键词
Ultra-high temperature ceramics; Zirconium diboride; Co-doping; Oxidation resistance
资金
- NSFC [51702041]
- Open Foundation of Key Laboratory of Multi-spectral Absorbing Materials and Structures, Ministry of Education [ZYGX2016K009-3]
The oxidative degradation of ZrB2 ceramics is the main challenge for its extensive application under high temperature condition. Here, we report an effective method for co-doping suitable compounds into ZrB2 in order to significantly improve its anti-oxidation performance. The incorporation of SiC and WC into ZrB2 matrix is achieved using spark plasma sintering (SPS) at 1800 degrees C. The oxidation behavior of ZrB2-based ceramics is investigated in the temperature range of 1000 degrees C-1600 degrees C. The oxidation resistance of single SiC-doped ZrB2 ceramics is improved due to the formation of silica layer on the surface of the ceramics. As for the WC-doped ZrB2, a dense ZrO2 layer is formed which enhances the oxidation resistance. Notably, the SiC and WC co-doped ZrB2 ceramics with relative density of almost 100% exhibit the lowest oxidation weight gain in the process of oxidation treatment. Consequently, the co-doped ZrB2 ceramics have the highest oxidation resistance among all the samples.
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