Affiliation:
1. Institute of Materials China Academy of Engineering Physics Mianyang China
2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha China
Abstract
AbstractThe Cf/HfC‐SiC composite was produced by precursor infiltration and pyrolysis combined with gaseous silicon infiltration and an open porosity as low as 5.4% was achieved. Cf/HfC‐SiC composite has a thermal conductivity of 21.4 W·m−1·K−1, in addition, its flexural strength, elastic modulus, and fracture toughness are 328.9 ± 58.4 MPa, 48.9 ± 2.8 GPa, and 10.2 ± 1.2 MPa·m1/2, respectively. The compact matrix and the toughing mechanism by fibers account for the good mechanical properties. The Cf/HfC‐SiC composite survives the oxyacetylene torch test and the formation of a protective oxide scale by joint action of SiO2 and HfO2 contributes to good ablation performance of the composite.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Marketing,Condensed Matter Physics,Ceramics and Composites