A project is underway to qualify WC/CO and WC/Co-Cr coatings deposited using the high-velocity oxygen-fuel (HVOF) thermal spray technique as replacements for hard chrome plating that is currently being used in both manufacturing and repair of aircraft landing gear. Numerous Defense Department organizations and private companies are participating in this project. A Joint Test Protocol has been prepared that includes fatigue, corrosion, wear, impact, hydrogen embrittlement and chemical compatibility testng of the HVOF coatings as compared to hard chrome. Results will be presented for a substantial amount of these tests, as well as the results of rig testing of actual landing gear components from Defense Department aircraft. The development of standards and specifications for hte HVOF coatings (which is being executed in conjunction with the SAE Aerospace Metals Engineerign Committee) will also be discussed.
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