Vacuum Hard Coating

Vacuum coating (especially the preparation of hard coatings) From the process, control and equipment development to the application process, it is necessary to deeply understand the tribological behavior and wear mechanism during the service of the coated parts, and infer the node where friction and wear begin to work. Common tribological effects include the following four aspects. ① Abrasive wear: Remove the wear produced when sharp particles in the material enter the interacting surface. Taking the use of coating tools as an example, abrasive wear will result in scratches, grooves, chips, dimensional changes, and points of light on the tool's texture surface. (2) Surface fatigue: repeated and alternating mechanical stress causes the initiation and expansion of cracks, which leads to the destruction of coated parts. In the case of coated tools, surface fatigue can lead to lateral and crest cracks, pitting and microcorrosion (especially under rolling contact conditions), and tool breakage. Tribochemistry: Sliding contact leads to a chemical reaction, which in turn affects the tribological process. Taking the cutting process of coated tools as an example, interfacial diffusion can lead to tribochemical reactions. Usually, the cause of tribochemical wear is tribooxidation reaction, and the consequence is fretting corrosion. Corrosion: chemical or electrochemical reactions between metals and contacts (electrolytes, wet air, or melts). The result is the wear, pitting, cracking and rust of the coated workpiece. A large number of research literature and engineering application practice have shown that for any tribology system, the service process can be optimized by selecting a suitable coating.

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