ZrC_P/W复合材料组织结构与室温力学性能  

Microstructures and Mechanical Properties of ZrC_P/W Composites at Room Temperature

作　　者：宋桂明[1] 王玉金[1] 周玉[1] 孙毅[1] 

机构地区：[1]哈尔滨工业大学

出　　处：《稀有金属材料与工程》2001年第6期448-452,共5页Rare Metal Materials and Engineering

基　　金：航天九五预研项目 (18.10 .2 .3) ;中国博士后科学基金资助项目

摘　　要：用 XRD、 SEM和 TEM研究了 Zr C颗粒增强钨基复合材料 (Zr CP/ W,Zr CP的体积分数为 30 % )的组织结构。由于 Zr CP的加入 ,阻碍了钨晶粒在烧结时的长大 ;W向 Zr C晶格扩散 ,在 Zr C中形成 (Zr,W) C固溶体 ,Zr也向 W中发生了少量扩散 ,使 Zr CP/ W界面形成冶金结合。在复合材料中还存在很少量的 W2 C和 Zr O2 。室温下 ,复合材料的韧性、弹性模量和硬度都明显比纯钨高 ,但复合材料的抗弯强度比纯钨低。The microstructures of ZrC particle reinforced tungsten matrix composite (ZrC P/W, 30vol%ZrC particles) have been investigated using XRD, SEM and TEM. The experimental results indicate that the ZrC particles inhabit the growth of tungsten grains during sintering. The relative density of the composite is less than that of monolithic tungsten. W atoms diffuse in the lattice of ZrC, resulting in a formation of (Zr, W)C solid solution in ZrC particles, and a little of Zr diffuse in W lattice, resulting in a metallurgical bonding of ZrC particles to W matrix. W 2C and ZrO 2 phases were found rarely in the composites. At room temperature, the fracture toughness, elastic modulus and hardness of the composite increase because of the additive ZrC particles, but the flexural strength of the composite is lower than that of monolithic tungsten. The toughening mechanisms of ZrC P/W composite are crack deflection and grain refining.

关 键 词：钨基复合材料 组织结构 力学性能 韧化机制 碳化锆 

分 类 号：TB331[一般工业技术—材料科学与工程]