Scratch adhesion test of reactively sputtered TiN coatings on a soft substrate |
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| Affiliation: | 1. College of New Energy, Bohai University, Jinzhou, Liaoning, China;2. Laboratory Management Center, Bohai University, Jinzhou, Liaoning, China;3. College of Science, Liaoning University of Technology, Jinzhou, Liaoning, China;4. State Key Laboratory of Superhard Materials, Jilin University, Changchun, Jilin, China;5. Shenyang Institute of Geology and Mineral Resources, Shenyang, Liaoning, China;1. Department of Mathematics, Faculty of Science, Mahidol University, Rama VI Rd., Bangkok 10400, Thailand;2. School of Mathematics and Applied Statistics, University of Wollongong, NSW 2522, Australia;3. Centre of Excellence in Mathematics, CHE, Si Ayutthaya Rd., Bangkok 10400, Thailand;1. P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia;2. National Research Tomsk Polytechnic University, Tomsk, Russia |
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| Abstract: | Reactively sputtered TiN coatings on the relatively soft substrate, Crofer 1700 (Vickers' hardness about 176 HV), were subjected to a scratch test for adhesion. The critical load of the coating/substrate combination is defined as the load at the onset of coating failure as cracking or loss of the coating that causes an increase in acoustic emission. For example, at the critical load of a thicker coating (approximately 1.5 μm), not only cracking but also loss of the coating were observed with an increase in acoustic emission. However, at the critical loads of thinner coatings (1.2 μm or less), coating loss was not observed in spite of an increase in the emission but coating cracking did occur. A failure model is suggested for the given coating plus soft substrate system. Using this model, the maximum observed in a typical acoustic emission curve is explained. |
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