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FLAME AND PLASMA SPRAYED POLYMERIC PROTECTIVE COATINGS.
Summary technical rept. 1 Apr 67-31 Mar 68,
MONSANTO RESEARCH CORP DAYTON OH DAYTON LAB
Pagination or Media Count:
Sprayed polyimide and polyester coatings were measured for hardness, adhesion, and surface roughness, and evaluated via thermal stability, salt fog resistance and reproducibility of coating properties. Coatings of polyimide prepolymer pigmented with zinc, zinc oxide or aluminum were produced by plasma spraying on a variety of flat plate substrates. Good thermal stability was observed with polyimide coatings plasma sprayed on PH 15-7 Mo stainless steel at 650F in air. While salt fog resistance was not completely satisfactory, the coatings had good hardness and adhesion after exposure. Improved unpigmented polyester coatings and polyester coating pigmented with zinc, zinc oxide, and strontium molybdate were also produced via the plasma-spraying technique. Good reproducibility was obtained in plasma-sprayed coating properties. Polyester coatings were made with pencil hardnesses of H and good adhesion. A study was made to determine the feasibility of predicting coating properties from a knowledge of the plasma-spray process variables and fundamental polymer properties. Author
APPROVED FOR PUBLIC RELEASE