Título

ASSESSMENT OF MULTIFUNCTIONAL COATING ADHESION: COMPARISON BETWEEN INDENTATION AND SCRATCH TESTS

Autoria

Renan Oss Giacomelli; José Mário de Mattos; Pedro Besen Soprano; Diego Berti Salvaro; Cristiano Binder; Aloísio Nelmo Klein; José Daniel Biasoli de Mello

DOI

10.5151/1472-5836-25743

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Resumo

The adhesion of multifunctional coatings on soft substrates is of paramount importance in the tribological behavior of this important class of surface treatment. In particular, scratch and indentation tests have been extensively used in order to assess this property. In this paper, the adhesion of a-C:H diamond-like carbon films deposited on nitrided low carbon steel was evaluated by indentation and scratch tests. The coatings were produced by PECVD onto 1020 steel substrates with two different surface finishing: ground (Sq = 0.184 µm) and polished (Sq = 0.002 µm). Indentation tests using a Rockwell diamond indenter were conducted and the adhesion evaluated by measuring the spalling region on images obtained by using optical microscopy. The analysis of the spalling regions produced semi-quantitative results, eliminating the subjective qualitative analysis proposed by the standard method VDI 3198. In addition, scratch tests were performed using the same indenter and a comparison between the two techniques was established.

 

Palavras-chave

Diamond-like carbon; Adhesion; Topography; Nitrided steel