以自烧结性中间相沥青炭微球(MCMB)为基体,以沥青基磨碎炭纤维为增强体,采用简单的氧化处理、混合、热压成型、炭化等工艺一步制备C/C复合材料.研究了MCMB氧化处理深度对C/C复合材料的密度、失重、体积收缩率、弯曲强度及断面形态的影响.结果表明:C/C复合材料的密度和体积收缩率均较无炭纤维添加的炭块有所下降,当添加的炭纤维氧化程度足够深时,炭材料的抗弯强度得到明显提高;随着MCMB氧化时间的延长,C/C复合材料的断面逐渐变得平整;经250℃氧化60 min的MCMB与硝酸90℃氧化10h的炭纤维混合,热压成型后1000℃炭化1h得到的C/C复合材料的密度可达1.64 g/cm3,抗弯强度可达72.0 MPa.与现行的制备C/C复合材料的方法相比,本技术具有工艺简单、制备成本低廉等特点,是一种具有很大发展潜力的制备高性能C/C复合材料的新方法.
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