热处理温度对炭/炭复合材料性能的影响
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Release time:2021-07-17 Affiliation of Author(s):中南大学 Journal:硅酸盐学报 Key Words:炭/炭复合材料;刹车盘;热处理;石墨化度;导热系数;摩擦磨损性能;抗弯强度 Abstract:对同一种炭/炭复合材料,经过不同温度热处理后的微观结构、石墨化度、导热系数、抗弯强度和摩擦磨损性能进行了对比研究。试验表明:随着最终热处理温度的提高,易石墨化的热解炭偏振光下光学活性增强,而难石墨化的热解炭微观结构几乎没有变化;炭/炭复合材料的晶粒逐渐长大,层面间距缩小,石墨化度有较大提高;平行炭布方向的导热系数和垂直炭布方向的导热系数均有上升。同时,由于基体炭与炭纤维两者热膨胀系数的差别,热处理温度的提高,降低了基体与增强纤维的的结合强度,使炭/炭复合材料的抗弯强度降低。试验还表明:随着热处理温度的提高,炭/炭复合材料的摩擦表面逐渐形成薄而致密的自润滑膜,摩擦系数在经过一个峰值后趋于平稳状态,磨损量下降明显。经1800℃热处理的质量损失主要是由氧化造成的 Indexed by:Journal paper Discipline:Engineering First-Level Discipline:Materials Science and Engineering Document Type:J Volume:31 Issue:9 Page Number:842-847 Translation or Not:no Date of Publication:2003-09-15 Included Journals:EI -
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