EVALUATION OF PROTECTIVE COATINGS FOR MOLYBDENUM NOZZLE GUIDE VANES

摘要

Thirty seven molybdenum nozzle guide vanes prepared under Contract AF 33(616)-23851 and coated by various organizations for resistance to Jet engine operating conditions were evaluated in an engine exhaust stream at 186o-l890°F for k hours.nNon-destructive and metallographic examinations revealed the degree of deterioration of each type of coating after test.nResults indicate that in the temperature range of the test, multilayer electrodeposited metallic coatings have the longest service life.