THE EFFECT OF TEMPERATURE ON THE TRIBOLOGICAL PHENOMENON OCCURRING IN COMBINATION EXPANDED GRAPHITE–STEEL

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THE EFFECT OF TEMPERATURE ON THE TRIBOLOGICAL PHENOMENON OCCURRING IN COMBINATION EXPANDED GRAPHITE–STEEL

Journal Title: Tribologia - Year 2015, Vol 262, Issue 4

Abstract

The aim of this article is to evaluate the effect of temperature on the tribological properties of expanded graphite works with a steel shield. The examined association was composed of samples made from expanded graphite, which cooperated with a shield made of high carbon steel. The values of roughness of the disc are as follows: Ra = 2.233 μm, Rz = 15.608 μm, and Rq = 2.736 μm. Tests were performed at different temperatures. The durations of the tests were 30 and 60 seconds, and the sliding velocity was 25 mm/s. After each step, the samples were weighed. Based on the tests, the coefficient of friction and wear rate of the samples were determined. The tribological combination decreased the coefficient of friction with increasing temperature. The resulting coefficients of friction for specimens made of expanded graphite were lower than the graphite powder. In the field of applied pressures of 50 and 100 N/cm2, there was no effect on the coefficient of friction. A layer was formed on the surface of the steel, which is characteristic of graphite cooperation with steel.

Authors and Affiliations

Aleksandra REWOLIŃSKA, Marta PACZKOWSKA, Karolina PERZ, Tomasz ORŁOWSKI

Keywords

CARBIDE LAYERS PRODUCED IN VACUUM CHROMIZING PROCESS ON STEEL SURFACE COVERED WITH NICKEL ALLOYS CONTAINING CARBIDE-FORMING ELEMENTS

In this paper duplex layers of the CrC+(Ni-W), the CrC+(Ni-Mo) and the CrC+Ni type produced on tool steel surface, in combined galvanic and vacuum chromizing processes, have been investigated. Studies of layers thickness...

EP ID EP257265
DOI -
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