YANG Jinhua ^1,2, LIU Zhanjun ³, GUO Quangui ³, JIAO Jian ^1,2
(1. Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China; 2. National Key Laboratory of Advanced Composites, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China; 3. Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China)

Abstract：Titanium boride based ceramic matrix composites were firstly made by eutectic method from either the mixture of TiB₂, SiC and flake graphite, or that of TiB₂, TiC, SiC and flake graphite. Results show that different phases distributed uniformly in these composites, and the graphite phases in the composites were highly ordered. The d00₂ values of the graphite in the composites were 0.3385 nm and 0.3367 nm, and the Lc values were 60.8 nm and 46.7 nm, respectively. Boron was already doped into the carbon net, as indicated by the Raman analysis. Some amount of pores existed in the composites, with the porosity of 12.5% and 13.8%, respectively. Also, thermal conductivity coefficients of the composites were 41.0 W/(m·K) and 52.9 W/(m·K). Eutectic method could be a promising method for making titanium boride based ceramic matrix composites.
Key words: TiB₂; ultra-high ceramics; ceramic matrix composites; eutectic