CAJ | 학술논문

以高导热沥青基炭纤维布为增强体，中间相沥青为黏结剂，采用热模压成型及液相浸渍裂解工艺增密，并经高温石墨化处理制备二维高导热炭/炭复合材料。利用X射线衍射仪和透射电子显微镜对经不同温度处理后的沥青基炭纤维及二维高导热炭/炭复合材料的结构和形貌变化进行表征，并考察石墨化处理温度对复合材料热导率的影响。结果表明，随着热处理温度的升高，纤维及复合材料内部石墨微晶尺寸增大、取向度变好，纤维与基体间界面结合紧密、裂纹减少，而基体碳层间裂纹则呈扩大趋势。此外，二维高导热炭/炭复合材料的热导率随热处理温度的升高而线性增加，经3000℃处理后，材料热导率高达443 W/m·K。
이고도열력청기탄섬유포위증강체，중간상력청위점결제，채용열모압성형급액상침지렬해공예증밀，병경고온석묵화처리제비이유고도열탄/탄복합재료。이용X사선연사의화투사전자현미경대경불동온도처리후적력청기탄섬유급이유고도열탄/탄복합재료적결구화형모변화진행표정，병고찰석묵화처리온도대복합재료열도솔적영향。결과표명，수착열처리온도적승고，섬유급복합재료내부석묵미정척촌증대、취향도변호，섬유여기체간계면결합긴밀、렬문감소，이기체탄층간렬문칙정확대추세。차외，이유고도열탄/탄복합재료적열도솔수열처리온도적승고이선성증가，경3000℃처리후，재료열도솔고체443 W/m·K。
High thermal conductivity carbon/carbon composites ( HTC-C/Cs) have a high specific modulus and a low thermal ex-pansion in addition to all the excellent properties of traditional C/C composites, which have been a research focus in recent years. 2D HTC-C/Cs were prepared by hot pressure molding, densification by precursor impregnation and pyrolysis, and then heat treat-ment at high temperatures, using pitch-based carbon fiber fabric with a high thermal conductivity as reinforcement and mesophase pitch as the binder precursor. The structure and morphology of pitch-based carbon fibers and 2D HTC-C/Cs were investigated by XRD, SEM and TEM. The thermal conductivity was measured by laser-flash diffusivity. Results show that with increasing heat treatment temperature the crystallite size increases, the degree of order is improved, the thickness of laminar graphite around the car-bon fibers increases, and the number of interfacial cracks between the fiber and matrix decrease and cracks between matrix layers are expanded. A linear relationship between thermal conductivity and heat treatment temperature was observed and the highest thermal conductivity was 443 W/m·K after heat treatment at 3 000℃.