FORMATION OF THERMALLY SPRAYED CERAMIC FILM

摘要

PURPOSE:To form a thermally sprayed ceramic film having superior stripping resistance by thermally spraying an Ni-Cr or Ni-Al alloy on an Al base to form an underlayer and by thermally spraying ceramics on the surface of the underlayer. CONSTITUTION:An underlayer of about 0.05-2mm thickness is formed on the surface of an Al or Al alloy base heated to 250-400 deg.C by thermally spraying an Ni-Al alloy contg. 4-22wt% Al, an Ni-Cr alloy contg. 15-25% Cr or an Ni-Cr-Al alloy contg. 15-25% Cr and 4-22% Al. A thermally sprayed ceramic film of about 0.2-1.0mm thickness is formed on the surface of the underlayer by thermally spraying ceramics such as stabilized ZrO2. When this method is applied to the formation of a film on a material for the piston of an internal- combustion engine and the piston head, a corrosion resistant film having high mechanical strength and superior stripping resistance can be formed.