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A program to evaluate ceramic coatings currently available for use on stainless and low-alloy steels was established last year by the Bureau of Aeronautics, with the hope that some coatings had been developed that would possess resistance to thermal shock and protect the underlying metal from oxidation. Any coatings meeting these requirements would be considered for use in the exhaust systems of aircraft power plants. Companies that were interested in participating in the investigation were sent test specimens of AISI 321 stainless steel and AISI 4130 steel for application of suitable ceramic coatings. The coated specimens were then returned to the Naval Air Experimental Station for test and evaluation. Interest was specifically centered in determining three properties—resistance to thermal shock, protection against oxidation of the base metal, and adherence of coating to the metal. The 321 stainless steel specimens were to be tested at 1800 F, and the 4130 steel specimens were to be tested at 1200 F.
Ketcham, Sara J.
Metallurgist Aeronautical Materials Laboratory, Naval Air Material Center, Philadelphia, Pa.