A tribo-acoustic study in fretting wear of thin film coated materials
Hamid, Hadi M. N.
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Thin solid films of soft and hard materials are appropriate to lower friction and enhance the wear resistance of precision tribo-elements. Friction-wear-induced mechanical failure occurs in coated material due to de-bonding of thin film from the substrate. Adhesion of these films is a critical issue in the coating industry. Accelerated laboratory tests are essential for rapid evaluation of protective coatings. Approaches and techniques are available which can cause, detect and follow degradation of thin films under a variety of environmental stresses from its inception to gross failure. The technique of reading signatures obtained by the acoustic emission is gaining popularity in the nondestructive testing area. An attempt is made to correlate the acoustic energy dissipated from the sliding surfaces to energy released when thin film de-bonding takes place resulting in fatigue wear. Detailed analyses of the friction and acoustic signals are presented in this thesis. The time after which wear happens can be predicted quite accurately from the spectrum of acoustic emission.