Tribofilms are dynamic structures that form at the interface during frictional\nsliding. These films play a significant role in friction control, particularly under heavy\nloaded/high temperature conditions, such as those found at the cutting tool/chip interface.\nThe thermodynamic aspects of tribofilm formation are discussed here. Thermodynamic\nanalysis of entropy production during friction shows that there are two types of tribofilms\nthat affect the wear behavior of a cutting tool: (1) tribofilms forming as a result of the\nsurface modification of the cutting tools with further tribo-oxidation; and (2) tribofilms that\nform as a result of material transfer from the contacting frictional body (the workpiece)\nduring the tool/chip interaction. Experimental examples are presented, outlining the\nbeneficial role of both types of tribofilms.
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