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

• 来源期刊: 材料科学技术学报（英文版）
• 年，卷（期）: 2013,（1）
• 页码范围: 29-33
• 页数: 5页
• 语种: 英文

摘要

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％.