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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C_f/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/cm~3的C_f/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,C_f/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/Ta_2O_5界面处的反应所控制。
The continuous distributed TaC matrix was deposited in quasi-three-dimensional acupuncture carbon felt by chemical vapor infiltration (CVI) method to prepare carbon fiber reinforced TaC ceramic matrix C_f / TaC composites. The mechanical properties and mechanical properties of the composites were investigated at 1200-1600 ℃ Oxidation behavior. The results show that C_f / TaC composites with a density of 5.12 g / cm ~ 3 can be prepared by CVI method. The TaC ceramic matrix consists of fine fibrous crystals parallel to each other. Compared with C / C materials, The strength of C_f / TaC composite is controlled mainly by the diffusion of gas in the network structure of oxide interconnecting pores and the reaction at TaC / Ta_2O_5 interface during high temperature oxidation.