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采用化学气相渗透(CVI)+树脂浸渍碳化法(PIC)、CVI+沥青高压浸渍碳化法(HPIC)及HPIC工艺分别制备了IR-C/C、IP-C/C以及P-C/C三种厚壁针刺C/C复合材料,研究了三种材料的热力学性能及材料内部密度均匀性。结果表明,IP-C/C材料轴向拉伸强度为24.7 MPa,IR-C/C材料轴向压缩强度达到200 MPa,而P-C/C材料轴向拉伸强度仅为7.4 MPa,相比IR-C/C材料降低了53%,相比IP-C/C材料降低了70%。复合致密化工艺制备的材料具有较低的热膨胀系数,而P-C/C材料1000℃热膨胀系数达到了3.566×10-6℃-1,是IPC/C材料的2.5倍。IP-C/C材料和P-C/C材料采用高压碳化工艺增密,材料的致密度高,密度分布均匀,导热系数高。IR-C/C材料内部密度降为14.5%,密度分布为外高内低。以CVI+HPIC复合制备的材料综合性能优异,且内部密度分布均匀,适合于制备厚壁材料。
Three kinds of thick walls of IR-C / C, IP-C / C and PC / C were prepared by chemical vapor infiltration (CVI) + resin impregnation and carbonization (PIC), CVI + HPIC and HPIC process respectively. Acupuncture C / C composites, the thermodynamic properties of three materials and material density uniformity within the study. The results show that the axial tensile strength of IP-C / C material is 24.7 MPa, the axial compressive strength of IR-C / C material is 200 MPa, and the tensile strength of PC / C material is only 7.4 MPa. The C / C material has been reduced by 53%, a 70% reduction compared to the IP-C / C material. The material prepared by the composite densification process has lower coefficient of thermal expansion, while the thermal expansion coefficient at 1000 ℃ of P-C / C material reaches 3.566 × 10-6 ℃ -1, which is 2.5 times that of IPC / C. IP-C / C materials and P-C / C materials using high-pressure carbonization technology densification, the material of high density, uniform density distribution, high thermal conductivity. The internal density of IR-C / C material is reduced to 14.5%, and the density distribution is high and low. The materials synthesized by CVI + HPIC are excellent in comprehensive properties and uniform in internal density, which is suitable for preparing thick wall materials.