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LPCVD-based SiO2/SiC multi-layers coating on graphite for improved anti-oxidation at wide-ranged temperatures

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/cm2 and 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 SiO2 at elevated temperature.

» Author: Yang Li, Wu Liang, Yuan Shi, Wei Zhou

» Reference: Composites Part B: Engineering, Volume 146

» Publication Date: 01/08/2018

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