Cured coated composites and their production

摘要

A self-supporting film of a curable fluorine-containing aromatic polyimide precursor resin is applied to and cured at elevated temperature and pressure on one or more outer surfaces of a reinforced substrate. The substrate is (1) a prepreg lay-up of (a) reinforced plies of a curable aromatic polyimide precursor or (b) fibers impregnated with a cured polyimide powder, or (2) a composite previously formed by curing a lay-up of a reinforced plies of a curable aromatic polyimide precursor. The resultant cured coating improves the erosion resistance of the composites so formed. Use of such films avoids the difficulties experienced when using conventional spray coating procedures.