用化学气相渗透(CVI)方法在准三维针刺炭毡中沉积连续分布的TaC基体, 制备出炭纤维增强TaC陶瓷基体Cf/TaC复合材料, 研究了材料的力学性能和在1200--1600℃的氧化行为。结果表明, 用CVI法可制备密度为5.12 g/cm3的Cf/TaC复合材料, TaC陶瓷基体由相互平行的细纤维状晶体组成; 与C/C材料相比, 该复合材料的抗弯强度略低, 但表现出较好的延展性断裂行为; 在高温氧化过程中, Cf/TaC复合材料主要受气体在氧化层连通孔隙网络结构中的扩散和TaC/Ta2O5界面处的反应所控制。
C fiber reinforced TaC matrix composites were prepared by isothermal chemical vapor infiltration method. The microstructure, mechanical properties and oxidation behaviors at 1200–1600oC were tested by scanning electron microscopy, INSTRON universal machine and an Al2O3 corundum tube (heated by MoSi2) in natural convection air. The results shown that Cf/TaC composites with density of 5.12 g/cm3 can be prepared by CVI; in which TaC ceramic matrix was composed of needle–like crystal structure. The composites show a good ductibility, but a low flextural strength when compared with C/C composites. The 1200–1600 oC oxidation process of Cf/TaC was mainly controlled by the diffusion of oxidation gases in the connected pore–net structure and the reaction at the TaC/Ta2O5 interface.
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