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ACRC Technical Report 157PDF


Title:Running-In and Scuffing Studies
Author(s):Cavatorta, M.P.; Whittenhall, J.; Cusano, C.
starved lubrication
surface film formation
Abstract:In Part I of this two part paper, extensive surface analysis is done to examine surface changes caused by different run-in procedures on 390-T6 aluminum pins sliding against 1018 carburized steel disks. The area contact is lubricated by a base polyalkylene glycol (P AG) lubricant mist carried by a tetrafluoroethane (R134a) refrigerant gas under starved lubrication conditions. Run-in pressure, velocity and time as well as the effect of the friction coefficient during run-in are examined. Limited data are also obtained for different degrees of starvation. Surface traces of the pin specimens show that changes in the profile are limited to the first minutes of sliding. Longer run-in times allow for the formation of iron oxides as well as AI-Fe intermetallic compounds on the aluminum pins. The iron transfer to the pin is due to the abrasive action of the silicon particles on the steel disk.
Issue Date:1999-09
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-157
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 82
Date Available in IDEALS:2009-05-26

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