Investigating the wear characteristics of engineered surfaces : low-temperature plasma nitriding and TiN + MoS x hard-solid lubricant coating

Haider, Julfikar, Rahman, Mahfujur, Hashmi, Mohammed and Sarwar, Mohammed (2008) Investigating the wear characteristics of engineered surfaces : low-temperature plasma nitriding and TiN + MoS x hard-solid lubricant coating. Journal of Materials Science, 43 (10). ISSN 0022-2461

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Abstract

Significant progress has been made in the past decade in plasma nitriding with a majority of the research work focusing on improving hardness and wear resistance of the nitrided surface through the reduction of nitriding temperature, pressure or time. Hard-solid lubricating coatings have also been extensively studied for lowering the wear rate and coefficient of friction of traditional hard coatings such as TiN by the combined effect of hardness and solid lubrication. In this study, the wear characteristics of low-temperature plasma-nitrided steel substrate performed using a Saddle-field fast atom beam source and TiN + MoS x hard-solid lubricant coating deposited by a closed-field magnetron-sputtering technique have been investigated. The thin hard layer in plasma-nitrided substrates exhibited much higher hardness and lower wear compared to the untreated substrate in pin-on-disc wear testing. In addition, the study of the wear track morphology of the nitrided samples evidenced significant reduction of deeper ploughing and plastic deformation due to higher hardness and load supporting of the nitrided layer. On the other hand, due to the incorporation of MoS2 in TiN coating, the wear resistance and coefficient of friction were greatly improved in TiN + MoS x coating compared to pure TiN coating. In contrast to TiN coating, a relatively smoother wear track with less abrasive wear also supported the beneficial effects of adding MoS2 in TiN coating.

Item Type:	Article
Additional Information:	Special Section: Proceedings from the Surface Science Symposium – International conference on Surfaces, Coatings and Nanostructured Materials 2007 (NanoSMat), pp. 3368-3376.
Subjects:	F200 Materials Science
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	EPrint Services
Date Deposited:	23 Jul 2009 14:52
Last Modified:	12 Oct 2019 19:06
URI:	http://nrl.northumbria.ac.uk/id/eprint/1320

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