碳纤维增强TiC复合材料的制备与高温强度

Processing and Elevated Temperature Strength of TiC Composites Reinforced with Carbon Fibers

采用热压烧结工艺制备了碳纤维增强 Ti C复合材料 (2 0 vol%碳纤维 ) ,研究了热压烧结温度对力学性能的影响和碳纤维对复合材料高温强度的增强作用。结果表明 :采用球磨湿混工艺将易于团聚的短碳纤维均匀地分散在 Ti C基体中 ,Cf/ Ti C复合材料最佳热压烧结温度为 2 10 0℃ ,Cf/ Ti C复合材料的室温抗弯强度为 5 93MPa,断裂韧性为 6 .87MPa· m1 / 2 ,140 0℃时的高温抗弯强度为 439MPa。

TiC 20vol% carbon fiber composites were prepared using hot pressing, and the effect of sintering temperature and fiber on the mechanical properties of the composites were investigated The discontinuous carbon fibers were uniformly distributed in TiC matrix using wet ball milling mixing The suitable hot pressing temperature for C f/TiC composites was 2100℃ The strength values of C f/TiC composites at room temperature and 1400℃ were 593MPa and 439MPa, respectively, and the fracture toughness value was 6 87MPa·m 1/2 The strengthening and toughening effects of carbon fibers were evaluated