Correlation of Spectrographic Oil Analysis Data With SEM and X-Ray Data by Direct Examination of Particles in Hydraulic Oils

[+] Author and Article Information
O. Johari, I. Corvin, A. V. Samudra, J. Staschke

IIT Research Institute, Chicago, Ill.

J. of Lubrication Tech 99(2), 152-156 (Apr 01, 1977) (5 pages) doi:10.1115/1.3452998 History: Received June 30, 1976; Online October 20, 2010


The Spectrographic Oil Analysis Program (SOAP) is a standardized procedure for spectrochemically determining the average analysis of all particles present in a sample of oil from hydraulic or lubricated systems. In the present program scanning electron microscopy (SEM) and X-ray analysis were employed to study the morphology and chemistry of individual particles collected from oil samples. Also, a large collection of particles could be studied for obtaining an average analysis of all the particles in the analyzed area. Comparisons of SEM/X-ray data with SOAP data, and their correlation with conditions of parts showed good correlation for the aluminum-containing particles in the aircraft hydraulic system. Though not detected by SOAP, SEM/X-ray analysis showed several particles containing silicon (identified mostly as silica with X-ray diffraction), most of which were typically larger than 5 microns.

Copyright © 1977 by ASME
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