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Chemical Vapor Deposition of Wear-resistant Coatings.
Stephenson-JB; Soboroff-DM; McDonald-HO; Cochran-AA
NTIS: PB 294 999 :10 pages
The Bureau of Mines, under an interagency agreement with the Department of Energy (DOE), investigated the feasibility of hardfacing the critical surfaces of valves and similar devices by chemical vapor deposition. The purpose of this research was to increase the wear resistance of these components for use in the abrasive and erosive environment of coal gasification units. Tungsten and molybdenum coatings were produced on nickel-plated carbon steels and stainless steels by hydrogen reduction of the metal hexafluoride at 325 deg to 600 deg c. Titanium nitride coatings were produced on low-carbon steels by the reaction of titanium tetrachloride, hydrogen, and nitrogen at 1,000 deg c. Titanium carbonitride coatings were produced on low-carbon steels by the reaction of nitrogen, hydrogen, and methane at 900 deg c. Tungsten, molybdenum, and titanium nitride coatings were formed on 6- , 10-, and 12-inch (0.15-, 1.25-, and 0.30-Meter) ball valve seats for evaluation in the low-btu coal gasification pilot plant at the Morgantown Energy Research Center, Morgantown, West Virginia.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 294 999
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division