Mullite Oxidation Resistant Coating for SiC-coated Carbon/Carbon Composites by Supersonic Plasma Spr

• 作 者: Chao Ma Hejun Li Heng Wu Qiangang Fu Can Sun Xiaohong Shi Yulei Zhang Zhengzhong Zhang Jun Tao Zhihai Han
• 机 构: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University,State Key L
• 出 处: Journal of Materials Science & Technology
• 发表日期: 2013年01期
• 关键词: mullite coated spraying supersonic crystalline amorphous attributed outer heatin

To improve the oxidation resistance of carbon/carbon (C/C) composites, mullite coating was prepared on the surface of SiC-coated C/C composites by supersonic plasma spraying. Phases and microstructures of mullite coating were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The coating primarily consists of a single phase of mullite (3Al2O3-2SiO2). The SEM results show that mullite coating was continuous and well bonded with the SiC inner layer without penetrating crack. Mullite coating exhibited good oxidation resistance. After 98.5 h oxidation at 1773 K and 9 thermal shock cycles between 1773 K and room temperature, the weight loss of the coated C/C composites was only 2.57%.

To improve the oxidation resistance of carbon / carbon (C / C) composites, mullite coating was prepared on the surface of SiC-coated C / C composites by supersonic plasma spraying. Phases and microstructures of mullite coating were characterized by X-ray diffraction The SEM results show that mullite coating was continuous and well bonded with the SiC inner layer without penetrating crack. Mullite coating exhibits the single phase of mullite (3Al2O3-2SiO2) good oxidation resistance. After 98.5 h oxidation at 1773 K and 9 thermal shock cycles between 1773 K and room temperature, the weight loss of the coated C / C composites was only 2.57%.