TEST RESULTS ON FALEX PINS COATED BY THE PLASMA-ARC PROCESS.
SPRINGFIELD ARMORY MASS
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Coatings of nickel-alumina, molybdenum, tungsten, alumina, tungsten carbide-cobalt, stainless steel, and zirconia applied to Falex pins by the plasma-arc process were tested for wear resistance. The tungsten carbidecobalt, the tungsten, and the molybdenum coatings showed unusually good wear characteristics comparable to dispersions of diamond, zirconia, and thoria in chromium electroplate formed at high current densities. The coefficients of friction appeared to be somewhat higher in the plasma-arc coatings. This may be due, however, to the initial roughness of the surfaces tested. The other plasma-arc coatings, i.e., nickel-alumina, alumina, stainless steel, and zirconia either flaked, wore off, or galled under test. Procedures are described and results are discussed. Author