以磷片石墨Cfg,SiC,B4C和TiO2为原料,热压合成C-SiC-B4C-TiB2复合材料,研究不同Cfg含量和热压温度对复合材料显微组织和力学性能的影响规律.结果表明:烧结过程中TiO2与B4C反应原位生成TiB2;复合材料的密度和抗弯强度随着热压温度的升高而增加,却随着Cfg含量的增加而降低,随着热压温度的升高和Cfg含量的增加,复合材料的断裂韧性则提高;在2 000 ℃,25 MPa下热压时,Cfg含量为20%(质量分数)的复合材料其体积密度为2.81 g/cm3,抗弯强度为236.7 MPa,断裂韧性为5.3 Mpa·m1/2,Cfg含量为65%含量的复合材料的体积密度为2.42 g/cm3、抗弯强度为103.6 MPa、断裂韧性为8.1 Mpa·m1/2;复合材料的致密化程度和陶瓷晶粒随热压温度的升高而增大,复合材料中Cfg层状分布结构随Cfg含量的增加更加明显;复合材料中Cfg弱界面分层诱导韧化作用及第二相TiB2和陶瓷基体热膨胀系数不匹配所产生的残余应力导致的裂纹偏转作用是复合材料断裂韧性提高的主要原因.
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