最近の表面処理技術の動向

概要

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The trend of recent surface treatment technology is reviewed. Various kinds of hard coating processes such as TRD, CVD, PVD and PCVD have been applied to dies and molds. As a recent trend of the surface treatment technology for dies and molds, a low-temperature process has been desired from a viewpoint of deformation and change in dimension, and a coating process for dies and molds of complicated geometry has become important. Furthermore, the duplex process (diffusion-hardening treatment + hard coating) has been used for prolongation of dies and molds lives. The PCVD process has good film adhesion and good throwing power at low temperatures, and it can perform the duplex process continuously. Consequently, the PCVD process has been widely applied to dies and molds. It is expected that the nano-composite films of TiAlSiCNO system and the DLC films by the PCVD realize lubricant-free cold pressing and cold forging and lubricant-less warm and hot working.