APPLICATION OF CAST OPEN-CELL POROUS ALUMINUM FOR SELF-LUBRICATING BEARINGS
Journal Title: Проблеми тертя та зношування - Year 2018, Vol 78, Issue
Abstract
Applicability of cast open-cell porous Al for the use as porous 'self-lubricating bear- ings' was studied experimentally using tribological tests. Samples of open-cell porous Al have been produced by casting the melt of Al7Si alloy (similar to A356 alloy) around particles of soluble salt NaCl as removed space holder. Fraction volume po- rosity, morphology of interconnected cells and strength properties of cast porous Al were studied and specified before tribological tests which were performed by using pin-on-disk friction machine. Samples of the cast porous Al were impregnated by mo- tor oil and, then, tested in sliding regime against a rotating steel disk that serves as the counterbody. In this manner, tribological properties were reported as variation of friction coefficient versus time of sliding. As a main result of the tests, friction co- efficient of cast porous-oil Al samples being recorded under contact pressure varied from 0.02 to 0.26 MPa and sliding velocity of 0.0942 m/s was measured and com- pared with that of compact Al subjected to the same operating conditions. Cast po- rous-oil Al samples showed promising self-lubricating properties with a friction coef- ficient 0.08 which was less by roughly about 2 times than that for compact Al. The results of the present study testified that impregnated cast porous Al could be quali- fied as material used in performance of 'self-lubricating bearings'.
Authors and Affiliations
A. V. BYAKOVA, A. M. KOVALCHENKO, A. A. VLASOV
Keywords
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