High temperature oxidation resistance of La2O3-modified ZrB2-SiC coating for SiC-coated carbon/carbon composites
High temperature oxidation resistance of La2O3-modified ZrB2-SiC coating for SiC-coated carbon/carbon composites
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SiC涂层碳/碳复合材料La2O3改性ZrB2-SiC涂层的高温抗氧化性能
DOI：
10.1016/j.jallcom.2018.06.230
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发表时间：
2018-10
影响因子：
6.2
通讯作者：
Zhang Cheng
中科院分区：
文献类型：
--
作者：
Chen Miaomiao;Li Hejun;Yao Xiyuan;Kou Gang;Jia Yujun;Zhang Cheng
为了提高碳/碳（C/C）复合材料在高温下的长期抗氧化性能，采用包埋胶结法制备了la2o3改性ZrB2-SiC （ZSL）涂层。结果表明：与ZrB2-SiC （ZS）涂层相比，ZSL涂层的C/C复合材料在1500 °C和1600 °C时的抗氧化性能有显著提高；在1500 °C静态氧化550 h后，ZSL涂层试样的质量损失仅为0.6%，而ZS涂层试样在相同条件下的质量损失为1.89%。ZSL涂层对C/C复合材料在1600 ℃下的107 h 的抗氧化性能也有良好的保护作用，质量损失为0.92%。ZSL包覆试样在1500 ℃至室温范围内进行50次热冲击时，质量增益为0.35%。生成的La-Si-O复合玻璃层与热稳定相ZrSiO4的协同作用可使材料具有优异的抗氧化和热冲击保护能力。
To improve the long-term anti-oxidation performance of carbon/carbon (C/C) composites at high temperature, La2O3-modified ZrB2-SiC (ZSL) coating was prepared on SiC-coated C/C composites by pack cementation. The results indicated that significant improvement was achieved on the oxidation resistance of ZSL coated specimens compared with ZrB2-SiC (ZS) coating for SiC-coated C/C composites at 1500 °C and 1600 °C. The mass loss of the ZSL coated specimen was merely 0.6% after a static oxidation test at 1500 °C for 550 h, while that of the ZS coated specimen was 1.89% at the same condition. And the ZSL coating can also protect C/C composites from oxidation for 107 h at 1600 °C with the mass loss of 0.92%. Moreover, the mass gain of ZSL coated specimen was 0.35% when it subjected to the thermal shock between 1500 °C and room temperature for 50 times. The excellent protection ability against oxidation and thermal shock could be attributed to the synergetic effects of generated La-Si-O compound glassy layer and thermally stable phase ZrSiO4.
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DOI：
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