以短切碳纤维、热固性酚醛树脂为原料,经真空成型得到短切碳纤维预制体(Fiberform),再以Fi-befform为骨架、酚醛树脂溶液为浸渍液,经反应干燥得到酚醛浸溃碳烧蚀体(PICA).结果表明:Fiberform具有明显的各向异性,当Fiberform的密度由0.13 g/cm3增大到0.18 g/m3时,其纵向压缩强度由0.10 MPa增大到0.39 MPa,横向压缩强度由0.33 MPa增大到0.79 MPa.PICA具有酚醛气凝胶/碳纤维复合型结构,其密度可以通过控制酚醛树脂溶液浓度来调节.当PICA的密度由0.27 g/cm3增大到0.43 g/cm3,其纵向压缩强度由0.45 MPa增大到2.42 MPa,横向压缩强度由1.36 MPa增大到3.12 MPa.PICA的隔热性能与Fiberform相近,其纵向和横向热导率分别为0.08和0.11 W/(m.K).
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