LPCVD-based SiO2/SiC multi-layers coating on graphite for improved anti-oxidation at wide-ranged temperatures
LPCVD-based SiO2/SiC multi-layers coating on graphite for improved anti-oxidation at wide-ranged temperatures
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石墨上基于 LPCVD 的 SiO2/SiC 多层涂层可提高宽温度范围内的抗氧化性
DOI：
10.1016/j.compositesb.2018.03.035
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Wei Zhou
中科院分区：
文献类型：
--
作者：
Yang Li;Wu Liang;Yuan Shi;Wei Zhou
采用低压化学气相沉积（LPCVD）法在石墨表面制备了SiO2/SiC多层涂层，以提高石墨在较宽温度范围内的抗氧化性能。抗氧化测试在环境空气中在1000 °C和1500 °C下进行。结果表明，SiO2/SiC多层涂层的氧化是一个持续增重的过程，而单一SiC涂层的氧化失重较快。SiO2/SiC涂层试样在1000 °C和1500 °C下氧化120 h后的最终增重分别为0.116 mg/cm 2和0.225 mg/cm 2。SiO2/SiC多层涂层的上级抗氧化性能是由于层间结合完整和SiO2在高温下具有良好的自修复能力。
A novel SiO2/SiC multilayer coating was prepared on graphite by low-pressure chemical vapor deposition (LPCVD) with the aim of enhancing oxidation resistance at wide-ranged elevated temperatures. The anti-oxidation tests were performed at 1000 °C and 1500 °C in ambient air. The results showed that oxidation of SiO2/SiC multilayer coating was a continuous weight gain process, compared to the fast weight-loss of single SiC coated specimens. The final weight gains of SiO2/SiC coated specimens after oxidation at 1000 °C and 1500 °C for 120 h in ambient air are 0.116 mg/cm2and 0.225 mg/cm2, respectively. The superior anti-oxidation performance of SiO2/SiC multilayer coating is ascribed to the intact combination between layers and excellent self-healing ability of SiO2at elevated temperature.