由炭布制备C／C复合材料工艺及性能的研究

为通过快速增密和低设备成本降低C／C复合材料的成本，采用中压浸渍、炭化多次循环的工艺制备了快速增密的C／C复合材料。该工艺以Z向增强的层叠炭布为增强体，不同软化点的中间相沥青和改性沥青为浸渍剂。考察了浸渍工艺，并研究了所得C／C复合材料的力学性能和断裂形貌。结果表明，中间相沥青及改性沥青等高残炭收率沥青是C／C复合材料极佳的浸渍剂，有利于快速增密。8次循环后（约2周时间），复合材料的密度从0.84g/cm^3增至1.76g/cm^3。炭布层叠Z向增强的C／C复合材料有良好的力学性能，而且其性能随着密度的增加而提高。所得复合材料的密度达到1.76g/cm^3时，拉伸强度为87.03MPa，弯强为113.56MPa，压缩强度为199.49MPa。

STUDY OF THE MANUFACTURE AND PROPERTIES OF C/C COMPOSITES FROM CARBON CLOTH

In order to decrease the cost of C/C composites from rapid densification and to decrease the cost of equipment, C/C composites derived with rapid densification were manufactured through cycles of impregnation under medium pressure and carbonization. In this process, carbon cloth reinforced in Z direction was used as reinforcement, and both mesophase pitch with different softening point and modified pitch with high carbon yield as impregnants. The process of impregnation was studied, and properties and fracture morphology of the resultant C/C composites were also measured. The result shows that pitch with high carbon yield, either mesophase pitch or modified pitch, is excellent impregnant for C/C composites and helpful to rapid densification. After 8 times cycle (about 2 weeks), the density of C/C composites reached 1.76?g/cm 3 from 0.84?g/cm 3. The C/C composites from laid up carbon cloth have good mechanical properties, and the mechanical properties increased with the density. When the density became 1.76?g/cm 3, the tensile strength is 87.03?MPa, flexural strength is 113.56?MPa, and compressive strength is 199.49?MPa.