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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/23936
Title: Tribochemistry in sliding wear of TiCN-Ni-based cermets
Authors: Manoj Kumar, Balabhadrapatruni Venkata
Basu B.
Vizintin J.
Kalin M.
Published in: Journal of Materials Research
Abstract: The tailoring of cermet composition to improve tribological properties requires careful choice of the type of secondary carbide. To investigate this aspect, a number of sliding tests were carried out on baseline TiCN-20Ni cermet and TiCN-20wt%Ni-10 wt% XC cermets (X = W/Nb/Ta/Hf) at varying loads of 5N, 20N, and 50N against bearing steel. With these experiments, we attempted to answer some of the pertinent issues: (i) how does the type of secondary carbide (WC/NbC/TaC/HfC) influence friction and wear behavior, and is such influence dependent on load?; and (ii) how does the secondary carbide addition affect the stability and composition of the tribochemical layer under the selected sliding conditions? Our experimental results reveal that the added secondary carbides influence chemical interactions between different oxides and such interactions dominate the friction and wear behavior. A higher coefficient of friction (COF) range, varying from 0.75 to 0.64 was recorded at 5N; whereas the reduced COF of 0.46-0.52 was observed at 20N or 50N. The volumetric wear rate decreased with load and varied on the order of 10-6 to 10-7 mm3/Nm for the cermets investigated. The cermet containing HfC exhibited high friction and poor wear resistance. At low load (5N), the abrasion and adhesion of hard debris containing various oxides dominated the wear, and resulted in high friction and wear loss. In contrast, the more pronounced increase in friction-induced contact temperature (below 500 °C) and compaction of hard debris resulted in the formation of a distinct tribochemical layer at higher loads (20N and 50N). The formation of a dense tribolayer containing oxides of iron and/or titanium is responsible for the reduced friction and wear, irrespective of secondary carbides. © 2008 Materials Research Society.
Citation: Journal of Materials Research, 23(5): 1214-1227
URI: https://doi.org/10.1557/jmr.2008.0165
http://repository.iitr.ac.in/handle/123456789/23936
Issue Date: 2008
Keywords: Adhesion
Cermets
Friction
Tribology
Wear of materials
Friction coefficient
Sliding wear
Tribochemistry
Tribological properties
Titanium alloys
ISSN: 8842914
Author Scopus IDs: 57208931860
35576893400
24504513900
7005515108
Author Affiliations: Manoj Kumar, B.V., Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur 208016, India
Basu, B., Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur 208016, India
Vizintin, J., Centre for Tribology and Technical Diagnostics, University of Ljubljana, Ljubljana 1000, Slovenia
Kalin, M., Centre for Tribology and Technical Diagnostics, University of Ljubljana, Ljubljana 1000, Slovenia
Corresponding Author: Kalin, M.; Centre for Tribology and Technical Diagnostics, , Ljubljana 1000, Slovenia; email: mitjan.kalin@ctd.uni-lj.si
Appears in Collections:Journal Publications [MT]

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