论文部分内容阅读
研制了聚丙烯腈基石墨纤维的三维正交平板编织物和圆筒编织物,并且设计了织物增强的自润滑聚酰亚胺复合材料板和管的制造方法。一种带有加热装置的水压机、平面压板和心轴可扩张的模具可用于制备作为ASTM类试验和摩擦学筛选试验用的平板状和管状复合材料毛坯,也可用于制造自润滑球轴承保持器。这些保持器的主要作用是要在316℃(600°F)下进行固体润滑透平轴承试验过程中可给高速系统补充润滑剂。制造技术中的实际制约因素受编织设计中综合处理方法的支配。这些方法必然要改变环状毛坯各部分的最大尺寸和局部强度。合理的设计工艺是要在不明显降低保持器横档牢固性的情况下增加球-球兜孔部位的强度。已经制取了薄截面的、在室温下强度高达238.2×10~6Pa和密度仅约为1.6g/cm~3的聚合物增强的环形保持器。
A three-dimensional orthogonal flat knitted fabric and a cylindrical knitted fabric of polyacrylonitrile-based graphite fibers were developed, and a fabric-reinforced self-lubricating polyimide composite plate and a method of manufacturing the same were designed. A hydraulic press with heating device, a flat platen and a mandrel-expandable mold can be used to prepare flat and tubular composite blanks for ASTM type tests and tribological screening tests as well as for the manufacture of self-lubricating ball bearing retainers . The primary function of these retainers is to lubricate high-speed systems during solid-lubricated turbine bearing tests at 316 ° C (600 ° F). The actual constraints in manufacturing technology are governed by a comprehensive approach to weaving design. These methods inevitably change the maximum size and local strength of each part of the ring blank. A reasonable design process is to increase the strength of the ball-pocket hole without significantly reducing the firmness of the retainer rail. Thin-section, ring-shaped, polymer-reinforced retainers having a strength of up to 238.2 x 10-6 Pa at room temperature and a density of only about 1.6 g / cm-3 have been prepared.