窒化チタン複合表面改質膜のアルミニウム合金との移着条件下でのしゅう動における寿命向上(機械要素,潤滑,設計,生産加工,生産システムなど)

概要

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The tribological performance of the titanium nitride (TiN) duplex coating has been studied as a potential surface modification for tools and machine parts for an aluminum alloy. Unlubricated sliding experiments on the duplex treated alloy tool steel blocks against an aluminum alloy ring were conducted under the oxidation-limited condition simulating the tool and machine surface where a transfer of aluminum alloy occurs. In the sliding experiments a transfer of aluminum alloy was predominating and little wear of the TiN coating film took place. After sliding for a certain distance, however, under the transferred layers a shell-like chipping appeared on the TiN film surface, and which grew downstream to cause a macroscopic spalling of the film. The film life defined by the occurrence of the spallation larger than 50 to 100μm is markedly prolonged by the tempering of the substrate nitrided layer. Possible mechanisms of the life improvement are discussed.
2010-10-25