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由于石墨/聚酰亚胺复合材料具有极为突出的热氧化稳定性,以及重量轻、刚度高和加工性能良好等全面卓越的性能,它必将成为航天飞机和运载火箭等空间飞行器的先进结构材料。石墨/聚酰亚胺具有良好的工艺性,能利用现有的成型加工设备制得各种层压板、波纹加强板、帽状截面加强板、工型桁条加强板、蜂窝夹层板和短纤维模压件等各种基本构件,以及空间运输系统大型结构部件。但由于石墨/聚酰亚胺固化温度高,对加热均匀程度要求也高,因而它的成型加工比一般复合材料难度高,除短纤维模压件采用模压成型工艺外,其他各种构件:层压平板、各种类型加强板、大型结构部件等均采用真空袋热压固化成型工艺,因此本文着重介绍石墨/聚酰亚胺真空袋热压固化成型工艺。形状复杂的大型结构部件是由用真空袋成型法制得的基本构件,再利用粘接工艺进行二次粘接成型而制成的,因此本文还介绍了几种聚酰亚胺高温粘合剂及其工艺条件,
Graphite / polyimide composites will be the advanced structural material for space vehicles such as space shuttles and launch vehicles, due to their outstanding thermo-oxidative stability, as well as their outstanding performance in terms of light weight, high stiffness and good processability . Graphite / polyimide has good processability and is capable of forming a variety of laminates, corrugated stiffeners, hat stiffener plates, profile beam stiffeners, honeycomb sandwich panels, and staple fibers using existing molding equipment Molded parts and other basic components, as well as space transport system components of large structures. However, graphite / polyimide curing temperature is high, the degree of uniformity of the heating is also high, so it is more difficult than the general composite molding process, in addition to short fiber molded parts using molding process, the other various components: laminated Flat plate, various types of strengthening plates, large structural components are used vacuum bag curing process, this article focuses on graphite / polyimide vacuum bag hot pressing molding process. Complex shape of large-scale structural components by the vacuum bag forming the basic components, and then use the adhesive bonding process for the second adhesive molding made, so this article also introduced several high-temperature polyimide adhesives and The process conditions,