中文摘要：

在1600℃、50 MPa条件下,采用放电等离子烧结工艺制备出了CNTs/B4C陶瓷基复合材料。研究了CNTs添加量对B4C烧结行为和力学性能的影响。采用X射线衍射仪和扫描电镜分析了复合材料的物相组成和微观结构。结果表明：随着CNTs含量的增加,复合材料的相对密度和力学性能呈现先增加后减小的变化趋势,且当CNTs含量为1wt%时,相对密度和力学性能达到最大值。分析认为,适量的CNTs有利于烧结过程中粉体的滑移,可以提高复合材料的烧结致密度,而随着CNTs含量的增加,位阻效应显著,使得复合材料的致密度降低。

英文摘要：

CNTs / B4 C ceramic matrix composites were prepared by spark plasma sintering at 1600 ℃under 50 MPa. The effects of CNTs additions on the sintering behavior and mechanical properties of B4 C were studied. The phase composition and microstructure of the composites were analyzed by XRD and SEM. The results indicate that the relative density and mechanical properties first increases as the CNTs contents increasing,and thereafter decreases. As the CNTs content was 1wt%,the maximum relative density and mechanical properties were obtained. The appropriate content of CNTs were beneficial for the powder sliding during the sintering process,resulting in the improvement of density. As the CNTs contents increasing,the density decreased,due to the obvious space steric hindrance.