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COATINGS FOR REFRACTORY METALS IN AEROSPACE ENVIRONMENTSThe behavior of 8 commercially coated refractory metal systems in various aerospace conditions was evaluated: PFR-6, Disil, and Durak-B coated TZM; PFR-32, CrTiSi, and vought IV coated Cb-752; CrTiSi coated B-66; and Sn-Al coated Ta-10W. Environmental and performance requirements for aerospace applications of coated refractory metals were analyzed. A detailed metallographic study was also conducted for each coating system. The behavior under various conditions was thus explained, and recommendations for additional applications and development were made. The following conclusions were drawn: the 8 coating systems have good utility over a broad range of aerospace applications; the oxidation resistance of all silicide-base coatings (including CrTiSi) and Sn-Al coatings is degraded at reduced pressure; in lifting reentry applications, temperature limits will probably be determined by the performance capabilities of the interior surfaces, where pressures will be lower.