Michael Furey

A new device has been developed and used to study metallic contact and friction between sliding, lubricated surfaces. The system consists basically of a fixed metal ball loaded against a rotating cylinder. The extent of metallic contact is determined by measuring both the instantaneous and average electrical resistance between the two surfaces. Friction between the ball and cylinder is recorded simultaneously with contact. In general, the electrical resistance was found to oscillate rapidly between an extremely low value and infinity, suggesting that metallic contact is discontinuous. The average resistance of an oil film is therefore a time-average, that is, a measure of the per cent of the time that metallic contact occurs. The results indicate that metallic contact is much more prevalent than would have been expected from other published studies in which electrical resistance or discharge methods were employed. Using this apparatus, the entire region from hydrodynamic (no metallic contact) to pure “boundary” lubrication (continuous metallic contact) can be readily investigated. Load, speed, mineral oil viscosity, the presence of additives, and operating time were found to be important variables influencing metallic contact. The apparatus is particularly useful in studying the action of antiwear and “extreme pressure” additives. It allows one to measure not only the effectiveness of these compounds in reducing metallic contact, but also the rate at which they act and the durability of protective films which may form.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFRICTION, WEAR, AND LUBRICATIONMichael J. FureyCite this: Ind. Eng. Chem. 1969, 61, 3, 12–29Publication Date (Print):March 1, 1969Publication History Published online1 May 2002Published inissue 1 March 1969https://pubs.acs.org/doi/10.1021/ie50711a005https://doi.org/10.1021/ie50711a005research-articleACS PublicationsRequest reuse permissionsArticle Views304Altmetric-Citations12LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts