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A comparison of the tribological behaviours materials modified of boron in the sliding pairs

Lubas J.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2010

z. 81 [277]

19-28

The aim of the present work is to determine the influence of technologically produced boron surface layers on the friction parameters in the sliding pairs under lubricated friction conditions. The tribological evaluation included ion nitriding, powder-pack boronizing, laser boronizing, hardening and tempering surface layers and TiB2 coating deposited on 38CrAlMo5-10, 46Cr2 and 30MnB4 steels. Modified surface layers of annular samples were matched under test conditions with counter-sample made from AlSn20 bearing alloy. Tested sliding pairs were lubricated with 15W/40 Lotos mineral engine oil. The tribological tests were conducted on a T-05 block on ring tester. The applied steel surface layer modification with boron allowed creating surface layers with pre-determined tribological characteristics required for the elements of sliding pairs operating under lubricated friction conditions. Boronizing reduces the friction coefficient during the start-up of the frictional pair and the maximum start-up resistance level is similar to the levels of pairs with ion nitride surface layers.