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A High Temperature Vapor Phase Lubrication Study Utilizing a Thioether Liquid LubricantMuch of the experimental work on vapor phase lubrication has employed certain organo phosphorous compounds as the vapor phase lubricant. Graham and Klaus, for instance, used tricresyl phosphate (TCP) and tributyl phosphate to vapor phase lubricate a four-ball wear tester using M50 steel balls at 370 C. Makki and Graham were able to vapor phase lubricate a reciprocating pin on plate tribometer using 1018 steel at 280 C with TCP vapor. Although a few organo phosphorous compounds, such as TCP, have been successfully used as vapor phase lubricants in many laboratory experiments, many problems remain unsolved. Two areas of concern relate to the 'durability' of phosphate deposited films and to the ability of the lubricating system to "self-recover" when vapor phase lubricated with an organo phosphorous compound. Durability refers to the ability of the deposited film to provide effective lubrication, for a period of time, after the vapor flow to the lubricating surfaces has been interrupted. Vapor phase lubrication tests, conducted at Cleveland State University with their high temperature tribometer, revealed that when TCP vapor flow to the lubricating surfaces was interrupted the frictional coefficient of the system rapidly increased from a value less than 0.1 to a value of 0.3 which was selected as our failure point. Self-recovery means the ability of the vapor phase lubricant to reduce the frictional coefficient of the lubricating system back down to value less than 0.1 after startup of the interrupted vapor flow. Lubrication tests conducted at Cleveland State University revealed that the high temperature tribometer could not self-recover after startup of the interrupted TCP vapor flow.
Document ID
19970026143
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Morales, Wilfredo
(NASA Lewis Research Center Cleveland, OH United States)
Graham, E. Earl
(Cleveland State Univ. Cleveland, OH United States)
Galvin, Thomas
(Cleveland State Univ. Cleveland, OH United States)
Date Acquired
August 17, 2013
Publication Date
April 1, 1997
Publication Information
Publication: Physics and Process Modeling (PPM) and Other Propulsion R and T
Volume: 2
Subject Category
Nonmetallic Materials
Report/Patent Number
Paper-33
Accession Number
97N25491
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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