Preparation and Properties of Self‐Healing Coating for C/SiC Brake Materials

An oxidation‐protective coating of C/SiC brake materials was prepared by the sol–gel method using tetraethoxysilane and triethylborate. The coating was characterized by Fourier transform‐infrared spectroscopy, X‐ray diffraction, and scanning electron microscopy. The oxidation resistance was also investigated. The results indicated that a dense and homogeneous borosilicate glass coating was formed on C/SiC. At 800°C, the normal service temperature of the brake disks, the as‐received borosilicate glass coating effectively protected C/SiC brake materials from oxidizing in air. Moreover, the coating showed excellent thermal shock resistance, excellent seawater corrosion resistance, and excellent self‐healing ability.