Self-healing ZrB 2 –SiO 2 oxidation resistance coating for SiC coated carbon/carbon composites

• DOI: 10.1016/j.corsci.2016.04.040
• Publication Date: 2016-04-30T07:58:18Z
• Authors: Ouyang Haibo; Li Cuiyan; Huang Jianfeng; Cao Liyun; Fei Jie; Lu Jing; Xu Zhanwei
• Keywords: Reinforced carbon–carbon; Carbon fibers

Abstract A ZrB 2 –SiO 2 coating was prepared on the SiC coated carbon/carbon composites by infiltrating silica sol into a porous ZrB 2 layer. The ZrB 2 –SiO 2 coating protected the composites from oxidation for 330 h at 1500 °C with a weight loss of 158 g/m 2 . The formation of ZrO 2 and ZrSiO 4 from ZrB 2 expanded the volume of solid phase, generating compressive stress in the coating at high-temperature oxidations. The phase transformation of ZrO 2 provided the compressive stress in the coating during cooling. These compressive stresses restrained the formation of cracks and improved the oxidation protection of the coating.