TiC含量对钨基材料性能的影响  

The Influence of TiC Content on The Properties of Tungsten Matrix Composites

作　　者：宋桂明[1,2] 王玉金[1] 周玉[1] 雷廷权[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院 [2]中国地震局工程力学研究所,哈尔滨150080

出　　处：《粉末冶金技术》2001年第5期266-269,共4页Powder Metallurgy Technology

基　　金：中国博士后科学基金项目 (2 0 0 0 [2 3]);国家自然科学基金项目 (5 0 10 10 0 3)

摘　　要：用热压烧结法制备了TiC含量 (体积分数 )分别为 0、10 %、2 0 %、30 %和 40 %的五种钨基材料 (TiC/W )。材料的硬度及弹性模量随TiC含量的增加而增大 ,分别由W基体的 3 4GPa、313GPa ,提高到 40 %TiC/W的 11 2GPa和 392GPa。随TiC含量的增加 ,材料的室温横向断裂强度和断裂韧度呈上升趋势 ,均在 2 0 %TiC/W时达到峰值 ,分别为 845MPa和 10 1MPa·m1/ 2 。随TiC含量增加 ,材料的热膨胀系数和比热容都增加 ,而热扩散率和热导率则显著下降。材料的热扩散率和热导率分别由W基体的 0 6 2 9× 10 -4 m2 /s和 15 3W / (m·K) ,提高到 40 %TiC/W的 0 110× 10 -4 m2 /s和 2 7 9W/ (m·K)In order to improve the mechanical and thermophysical properties of tungsten, tungsten matrix composites containing 0, 10, 20, 30 and 40 vol% TiC particles, respectively, were prepared by vacuum hot pressing, and the properties were measured. The hardness, elastic modulus, flexural strength and fracture toughness were obviously improved by the addition of TiC. The highest values for strength and toughness, 843MPa and 10.1MPa·m 1/2 , respectively, were obtained on samples with 20vol% TiC. As TiC content increases the coefficient of thermal expansion and the heat capacity of TiC/W composite increase, but, the thermal diffusivity and the thermal conductivity decrease remarkably. The values of thermal difussivity and thermal conductivity of the composites are 0.629×10 -4 m 2/s and 153 W/(m·K), without TiC addition, but 0.110×10 -4 m 2/s and 27.9W/(m·K), with 40vol%TiC addition.

关 键 词：钨基复合材料 力学性能 热物理性能 碳化钛 

分 类 号：TF125.241[冶金工程—粉末冶金] TB333[冶金工程—冶金物理化学]