EROSION COATINGS FOR HIGH TEMPERATURE POLYMER COMPOSITES

摘要

Erosion coatings were developed for polymer matrix composites (PMC's) used in gas turbine engine applications up to 280 deg C. Sheet molding compound (SMC) consisting of chopped T650-35 graphite fiber and PMR-15 thermosetting polyimide resin was compression molded into flat coupons. These PMC's were coated with several coating systems and evaluated for their response to thermal cycling and Al_2O_3 grit erosion protection. The two layered coatings, comprised of a soft metallic bondcoat and a hard topcoat, were quite durable to both thermal cycling and grit erosion. A design of experiments complimented the erosion testing and aided in the selection of the most durable coating system.