Microstructure, mechanical properties and oxidation behavior of TaC- and HfC-based materials containing short SiC fiber

作者：Pienti L; Silvestroni L^*; Landi E; Melandri C; Sciti D

来源：Ceramics International, 2015, 41(1): 1367-1377.

DOI：10.1016/j.ceramint.2014.09.070

• Fibers
• TaC
• HfC
• Thermo-mechanical properties

TaC- and HfC-based composites containing 15 vol% short SiC fibers as reinforcing phase were produced by hot pressing at 1700-1750 degrees C. Suitable sintering additives were selected in order to get a full densification at temperatures well-tolerated by SiC fibers. Microstructural characterization outlined a strong interaction between the carbide matrix and SiC fibers. The following properties were evaluated: Vickers hardness, fracture toughness by chevron notched beams, elastic modulus, 4-pt bending strength at room temperature and at 1200 degrees C, linear CTE up to 1300 degrees C in Ar, and thermal conductivity up to 1900 degrees C in Ar. Oxidation tests in air were carried out with thermogravimetric analysis up to 1500 degrees C and in a bottom up furnace at 1600 degrees C. TaC-based materials generally possessed higher thermo-mechanical properties compared to HfC, but lower oxidation resistance. Properties of fiber-reinforced composites were compared to those of unreinforced ones.

• 出版日期2015-1