采用真空热压烧结法制备La2O3-TiC/W复合材料,并对其组织结构和力学性能进行了研究.结果表明:在一定成分范围内,La2O3和TiC的加入提高了复合材料的力学性能,La2O3和TiC共同作用时的强化效果强于La2O3和TiC单独作用的强化效果,但La2O3-TiC/W复合材料的密度和相对密度随TiC含量的增加而下降,并进而影响硬度和弹性模量的提高,适量的La2O3有益于相对密度的提高;抗弯强度在1%La2O3-5%TiC/W成分含量时出现最大值901 MPa,而断裂韧性在成分含量为0.5%La2O3-10%TiC/W时出现最大值10.07 MPa·m1/2.本研究中,1%La2O3-5%TiC/W成分配比时具有较好的综合力学性能.La2O3-TiC/W复合材料的强化机制为细晶强化和载荷传递,韧化机制为细晶韧化、裂纹偏转和桥接.
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