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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2006

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Tribological behaviour of TiAlN coated carbides in dry sliding tests

Grzesik W., Zalisz Z., Król S.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 17, nr 1-2

181--184

Purpose: The tribological behaviour of the PVD-TiAlN-coated carbide inserts was studied in dry sliding against carbon and stainless steel and cast iron counterparts. The friction and wear effects were examined at variable sliding speeds and normal loads. Design/methodology/approach: A pin-on-disc device with round tool inserts was applied to conduct friction and wear tests in which both the friction coefficient and the linear wear of the tribo-pairs were continuously recorded versus sliding distance. The volumetric wear rate was used to compare the wear resistance of the tribo-pairs tested. Light microscopy (LOM), scanning electron microscopy (SEM) and X-ray microanalyses by EDAX were applied for observations of wear scars and wear products. Findings: Severe adhesive wear of the mating surfaces was found to be predominant mechanism in dry friction between the TiAlN coating and the AISI 304 austenitic steel. In this case the protective TiAlN layer was removed even under the lowest load and sliding speed applied. On the contrary, both TiAlN/C45 and TiAlN/ EN-GJL-300 pairs showed the mild abrasive wear mechanism with the occurrence of tribo-oxidation. For these cases the protective function of the PVD-arc TiAlN layer appeared to be sufficient. Research limitations/implications: The above findings to be transmitted to machining need confirmation in real machining conditions. However, they suggest serious limitations in use of the coatings tested. Practical implications: The results can be helpful in the tool choice for the three materials machined. Originality/value: Some specific frictional behaviours and relevant wear mechanisms observed are highlighted and quantified.