TITANIUM NITRIDE:AN OXIDIZABLE COATING FOR THE HIGH-TEMPERATURE PROTECTION OF GRAPHITE

摘要

A titanium nitride coating for graphite, prepared by the vapor-deposition process, protected test specimens for 60 seconds in a super¬sonic ceramic-heated air jet with a stagnation temperature of approximately 2,250° K. For the same test conditions, coated specimens showed no damage to the graphite body for the 60-second test, whereas uncoated specimens were very severely damaged after 20 seconds and were destroyed toward the end of the test. A discussion of the coating of these graphite specimens and of some of the conditions necessary for the utilization of oxidizable substances as oxidation-protective coatings for bodies facing high convective heat transfer in the atmosphere is presented.