PAS烧结SiC-石墨复相陶瓷的阻力曲线行为和抗热震性能

来源 :第二届中国国际复合材料科技大会 (CCCM-2) | 被引量 : 0次 | 上传用户:w332365605
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  采用PAS烧结工艺在1680℃成功制备出SiC-石墨复相陶瓷,并研究了石墨含量对复相陶瓷物理力学性能、韧性、R曲线(阻力曲线)行为和抗热震性能的影响。结果 表明:随着石墨含量的增加复相陶瓷的致密度、抗弯强度、弹性模量和维氏硬度均有所降低;以韧化比(TI)作为复相陶瓷的韧性指标,表明石墨含量越多,复相陶瓷的韧性越好,存在陡峭的上升R曲线行为,该指标更能反映复相陶瓷的韧性特征;显微形貌分析发现,复相陶瓷中存在的层状石墨增加了能量耗损,裂纹在扩展过程中发生偏转、分叉和桥联等现象,使得SiC复相陶瓷的韧性和抗热震性能得以改善。
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