20W_f/30ZrC_p/W复合材料的组织结构与力学性能

Microstructure and mechanical properties of 20W_f/30ZrC_p/W composite

采用真空热压烧结法制备了致密度为 98.5 %的 2 0Wf/ 30ZrCp/W复合材料 ,分析测试了复合材料的相组成、微观组织结构和力学性能。结果表明 :W丝在复合材料中分布较均匀 ,且基本平行于热压面 ;W与ZrC在界面处发生互扩散 ,形成了 (Zr,W )C固溶体 ;W丝与基体间的界面结合强度过高 ,并发生明显的再结晶现象 ;加入W丝未能起到强韧化作用。复合材料的抗弯强度和断裂韧性分别为 5 0 4MPa和 9.48MPa·m1/ 2 。

The composition, microstructure and mechanical properties of 20W f/30ZrC p/W composite produced using hot pressing technique were investigated. Results show that the relative density reaches 98.5%. The tungsten wires are well distributed within the ZrC p/W matrix with preferred orientation. There is an interdiffusion of Zr and W in ZrC p/W interface, which results in (Zr, W)C solid solution forming and a strong bond between ZrC particle and tungsten wire or tungsten. The tungsten wires are recrystallized and have no strengthening and toughening effects on ZrC p/W matrix. The strength and fracture toughness of 20W f/30ZrC p/W composite are 504?MPa and 9.48?MPa·m 1/2 , respectively.[