Infrared emission spectrophotometric study of the changes produced by TiN coating of metal surfaces in an operating EHD contactInfrared emission spectra and related measurements were obtained from an operating ball/plate EHD sliding contact under a variety of operating conditions. In order to be able to compare the effect of the ball surface, some of the steel balls were coated with a thin layer of titanium nitride (TiN) by vapor deposition. Polyphenyl ether (5P4E) was used as the lubricant and 1 percent of 1,1,2-trichloroethane TCE) as an additive with a high affinity for steel but a low affinity for TiN. TiN is chemically inert, but its thermal conductivity is lower than that of steel. Therefore, the overall temperatures with TiN-coated balls were higher. Nevertheless, no scuffng was observed with the coated balls under conditions giving rise to scuffing with the uncoated balls. Tractions were lower with the TiN-coated balls and with the steel balls when TCE was added to the 5P4E. These findings were found to be inversely related to the degree of polarization of the spectral emission bands. The intensity and the dichroism of these bands were related to shear rates and inlet conditions of the EHD contact.
Document ID
19830032011
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Keller, L. E. (Rensselaer Polytechnic Inst. Troy, NY, United States)
Lauer, J. L. (Rensselaer Polytechnic Institute, Troy, NY, United States)
Jones, W. R., Jr. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1982
Subject Category
Mechanical Engineering
Report/Patent Number
ASLE PREPRINT 82-LC-3C-3
Meeting Information
Meeting: American Society of Mechanical Engineers and American Society of Lubrication Engineers, Lubrication Conference