Friction capabilities of graphite-based lubricants at room and over 1400 K temperatures
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hdl:2117/133086
Tipus de documentArticle
Data publicació2019-01-02
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Abstract
The present work investigates the lubricant capabilities at room and hot-forging temperatures (>1400 K) of three types of
lubricants with two different graphite concentrations (8% and 12%). These lubricants are distinguished by measuring the
percentage of chemical elements and average size of graphite particles. Later, two standardized methods, i.e., pin-on disc and
ring test, are utilized to assess the main friction differences under laboratory and real industry conditions, respectively. The results
exhibit that the friction values at room temperature are lower for lubricant B, no matter which type of graphite concentration is
used, whereas at hot-forging temperatures, greater percentage of graphite enhances lower frictional values when higher deformations
are assessed. Additionally, the ring tests performed at hot-forging temperatures show significant tribology differences
when the degree of deformation reaches 50%. Particularly, the lubricant B shows the lowest values of friction coefficients of 0.22
and 0.21 for 8% and 12%of graphite concentration, respectively. Therefore, it can be concluded that the selection of a proper type
of lubricant (regarding chemical composition and size of solid suspension) and the graphite concentration are sensitive parameters,
when it comes to achieve different bulk deformations combined with extreme temperatures like in hot-forging process
CitacióSanchez Egea, A. J. Friction capabilities of graphite-based lubricants at room and over 1400 K temperatures. "International journal of advanced manufacturing technology", 2 Gener 2019, p. 1-11.
ISSN0268-3768
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Friction capabi ... -based lubricants_2019.pdf | Manuscript | 2,357Mb | Visualitza/Obre |