Accession Number : AD0841539
Title : HIGH TEMPERATURE RESISTANT POLYMERIC COATINGS.
Descriptive Note : Technical rept. 1 Feb 67-31 Jan 68,
Corporate Author : MONSANTO RESEARCH CORP DAYTON OH DAYTON LAB
Personal Author(s) : Butler, J. M. ; Hathaway, C. E. ; Cash, L. N.
Report Date : SEP 1968
Pagination or Media Count : 184
Abstract : Silicone and organic polymeric coatings systems have been sought with improved resistance to thermooxidative degradation in the 650 to 800 deg F air environment. Pigmented metal phosphate coatings have been investigated for utility to 1000 deg F. Silicone resins show the greatest promise for high temperature pigmented coatings on titanium. A semi-gloss white silicone coating retained interesting coating properties in excess of 2000 hr at 650 deg F. A gloss white silicone, although showing shorter utility, possessed superior gloss and extensibility. The organic polymers remain of interest particularly in unpigmented coatings because of their potentially longer retention of coating extensibility and water impermeability. Among the organic coating resins, a polyarylsulfone showed the best retention of coating integrity and adhesion after high temperature exposure. A pigmented casting showed utility for approximately 500 hr at 650 deg F. An unpigmented varnish coating retained interesting properties for about 400 hr but was sensitive to cracking from ultraviolet radiation. Surface treatment of a titanium substrate appears to be essential for obtaining good coating adhesion under thermooxidative and wide thermal cycling conditions. The greatest improvement has been achieved with a nickel-aluminum primer. Among chemical treatments employed, an HF-HC1-H3PO4 etch showed the best adhesion improvement. Pigmented metal phosphate coatings offer no obvious advantages over the silicone coatings on titanium-6A1-4V. (Author-PL).
Descriptors : (*COATINGS, HEAT RESISTANT PLASTICS), ORGANIC COATINGS, PHOSPHATE COATINGS, SILICONES, POLYMERS, POWDER METALS, OXIDES, SUBSTRATES, TITANIUM, BINDERS, PIGMENTS, AGING(MATERIALS), CHEMICAL PROPERTIES, EXPOSURE(PHYSIOLOGY), PAINTS, ADHESION, THERMAL PROPERTIES.
Subject Categories : Polymer Chemistry
Distribution Statement : APPROVED FOR PUBLIC RELEASE