Influence of microstructure and mechanical properties on the tribological behavior of reactive arc deposited Zr-Si-N coatings at room and high temperature
2016 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 304, 393-400 p.Article in journal (Refereed) Published
Varying the Si-content in Zr-Si-N coatings from 0.2 to 6.3 at.% causes microstructural changes from columnar to nanocomposite structure and a hardness drop from 37 to 26 GPa. The softer nanocomposite also displays lower fracture resistance. The tribological response of these coatings is investigated under different contact conditions, both at room and elevated temperatures. At room temperature tribooxidation is found to be the dominant wear mechanism, where the nanocomposite coatings display the lowest wear rate of 0.64 x 10(-5) mm(3)/Nm, by forming an oxide diffusion barrier layer consisting of Zr, W, and Si. A transition in the dominant wear mechanism from tribooxidation to microploughing is observed upon increasing the test temperature and contact stress. Here, all coatings exhibit significantly higher coefficient of friction of 1.4 and the hardest coatings with columnar structure display the lowest wear rate of 10.5 x 10(-5) mm(3)/Nm. In a microscopic wear test under the influence of contact-induced dominant elastic stress field, the coatings display wedge formation and pileup due to accumulation of the dislocation-induced plastic deformation. In these tests, the nanocomposite coatings display the lowest wear rate of 0.56 x 10(-10) mm(3)/Nm, by constraining the dislocation motion. (C) 2016 Elsevier B.V. All rights reseved.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 304, 393-400 p.
Zr-Si-N coating, Tribooxidation, High temperature wear test, TEM
IdentifiersURN: urn:nbn:se:liu:diva-132333DOI: 10.1016/j.surfcoat.2016.07.042ISI: 000384775900045OAI: oai:DiVA.org:liu-132333DiVA: diva2:1046209
Funding Agencies|Swedish Research Council (VR grant) [621-2012-4401]; Swedish Foundation for Strategic Research (SSF) through the program MultiFilms [RMA08-0069]; Swedish government strategic research area grant in material science AFM - SFO MatLiU [2009-00971]; EUs Erasmus Mundus graduate school in Material Science and Engineering (DocMASE); Swedish Governmental Agency for Innovation Systems (Vinnova) [VINNMer 2011-03464, M - Era.net 2013-02355]2016-11-122016-11-012016-11-16Bibliographically approved