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First approach on Nano scratch tests: A case study of thin PVD-Oxide coatings
2012 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This Masters thesis project has for its main goal the study of the adhesion properties of thin oxide functional layers on the TiAlN foundation layer deposited on cemented carbides by cathodic arc evaporation-PVD technology. The mechanical and performances properties of manufactured cutting inserts were also evaluated. Adhesion properties were studied using the newly acquired CSM-Nano scratch tester at CERTENSENS in Tours, France. Additionally, a user’s manual for the nano scratch tester was written. Different PVD parameters were used to manufacture different oxide coatings. For all coating types, the effect of binding, functional layers, layer thickness and bias ramp on both mechanical, adhesion and performance properties were studied.From the results of nano scratch testing, it was concluded that the nano scratch tester tool is not appropriate for evaluation of adhesion properties of this type of coating. The applied load is too low to cause adhesion failure of the coatings. During scratch testing, obtained values of the residual depth revealed a coating with high elastic properties. Resulting mechanical properties of functional layers are strongly connected to the mechanical properties of the starting layer. The performance of the inserts in a dry turning application is dependent on the coating thickness. A thicker TiAlN starting layer is required to achieve reasonable performances while it is the opposite for binding (AlCrON) and functional oxide (AlCrOx) layers. The bias ramp effect on coating properties is different for AlCrON in comparison to AlCrOx thin layers. Bias ramp has a negative impact on the AlCrON binding layer.

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URN: urn:nbn:se:ltu:diva-52101Local ID: 93f1e26d-9ec0-4509-bee8-07017f12bd73OAI: diva2:1025467
Subject / course
Student thesis, at least 30 credits
Educational program
Materials Engineering, master's level
Validerat; 20121120 (global_studentproject_submitter)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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Mvuyekure, Espérant-Emmanuel

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