Accession Number : ADA333663
Title : Low Friction and Wear Surface for Application over a Wide Range of Temperature
Descriptive Note : Final rept. 27 Sep 96-26 May 97
Corporate Author : UNIVERSAL ENERGY SYSTEMS INC DAYTON OH
Personal Author(s) : Bhattacharya, Rabi S.
PDF Url : ADA333663
Report Date : 26 JUN 1997
Pagination or Media Count : 47
Abstract : HERE IS A STRONG DEMAND FOR SOLID LUBRICANT COATINGS THAT CAN FUNCTION OVER A WIDE RANGE OF TEMPERATURES. Since none material can provide adequate lubricating properties over a wide temperature range, an approach of a composite coating was evaluated in Phase I. Composite coatings of ZnO and MoS2 were deposited by sputtering on M5O steel and Si3N4 substrates. Coatings were characterized by Rutherford back scattering (RBS), Auger electron spectroscopy (ABS) and Transmission electron microscopy (TEM), both before and after exposure to high temperatures (up to 700 deg C) in air. Friction measurements were performed at temperatures in the range of room temperature to 700 deg C in air. Results indicate that layered ZnO+MoS2/ZnO coating performed better at high temperature than the mixed composite coatings. Friction coefficients were in the range 0.2 to 0.3 at temperatures below 400 deg C for coated M50 substrate against uncoated M5O ball. At higher temperatures, the friction coefficient increased to greater or equal to 0.4 for coated Si3N4 substrate against uncoated Si3N4 ball.
Descriptors : *COATINGS, *SOLID LUBRICANTS, ELECTRON MICROSCOPY, ZINC OXIDES, WEAR, FRICTION, AUGER ELECTRON SPECTROSCOPY, SPUTTERING, LUBRICATION, MOLYBDENUM COMPOUNDS, SULFIDES.
Subject Categories : Coatings, Colorants and Finishes
Lubricants and Hydraulic Fluids
Distribution Statement : APPROVED FOR PUBLIC RELEASE