ZHANG Jiqing ¹, JIAN Ke ², WANG Hao ²

(1.China International Engineering Consulting Corporation, Bejing, China, 100048; 2.Science and Technology on Advanced Ceramic Fibers & Composites Laboratory, National University of Defense Technology, Changsha 410073, Hunan, China)

Abstract: Continuous SiC fiber reinforced SiC matrix (SiCf/SiC) composites has high strength and stability at high temperature and are the most attractive candidate materials for space-used lightweight components, first wall and blanket components in fusion reactor. SiCf/SiC composites made with indigenous SiC fibre run short of extensive research. In this paper, effects of ZrC particle (ZrCP) addition on the mechanical properties and ablation properties of SiCf/SiC composites were investigated. The results showed that the mechanical properties fabricated with ZrCP addition decreased, but the ablation properties fabricated with ZrCP addition were improved greatly. The flexural strength and fracture toughness of the SiCf/SiC composites with ZrCP addition were 360.7MPa and 12.55 MPa•m^1/2, respectively. Exposed for 60 seconds in a flowing oxyacetylene torch environment, the average mass loss rate and average recession rate were only 0.0063 g•s^-1 and 0.0051 mm•s^-1, respectively.

Key words:SiCf/SiC composites; ZrC particle; mechanical properties; ablation properties