Development of Antiwear Shim Inserts Utilizing Segment-Structured DLC Coatings

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概要

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• Wear and fretting fatigue are important technological problems in automotive, railway and aerospace fields. The purpose of this study is to find a method of reducing the wear of cast-iron (FCD)/aluminum components, which are often applied to automotives, and thus extend their lifetime. First, a stainless-steel (SUS) shim was designed, which can be inserted between an FCD plate and an aluminum plate. Second, diamond-like carbon (DLC) coatings were applied to the shim inserts to prevent the FCD and aluminum plates from wear. Then, the tribological and fatigue characteristics of the shim were evaluated by a ball-on-disk (BoD) test and a bending fatigue test of up to 1×106 cycles. Each substrate was coated with DLC by Plasma-Based Ion Implantation and Deposition (PBII&D). A unique feature of our shim is that a segment-structured DLC film (S-DLC) is employed as well as a continuous DLC (C-DLC) film. The effect of the DLC coating on reducing the damage to the Al plate was apparent, because the surface roughness of the Al plate abraded with the DLC-coated shim was significantly smaller than that abraded directly with the FCD plate. Moreover, the average damage fraction to the C-DLC coating is approximately 20-fold larger than that to the S-DLC coating. The C-DLC film suffers severe damage near the bolt hole, whereas the S-DLC film suffered almost no damage even after 1×106 bending cycles. In conclusion, an S-DLC-coated SUS shim has a marked effect on reducing the wear of Al/FCD components and improving their lifetime.

著者

• SAITO Masanori

  Dept. of Mechanical Sci. and Eng., Tokyo Institute of Technology

• OHTAKE Naoto

  Dept. of Materials, Physics and Energy Engineering, Graduate School of Engineering, Nagoya University

• KURODA Tsuyoshi

  Dept. of Materials, Physics and Energy Engineering, Nagoya University

• TAKASHIMA Mai

  Dept. of Materials, Physics and Energy Engineering, Nagoya University

• MATSUO Makoto

  iMott Inc.

• IWAMOTO Yoshinao

  iMott Inc.

• OHTAKE Naoto

  Dept. of Materials, Physics and Energy Engineering, Nagoya University

関連論文

• Segment-Structured Diamond-Like Carbon Coatings on Polymer Catheter
• Development of Antiwear Shim Inserts Utilizing Segment-Structured DLC Coatings
• Fabrication of Textured DLC Films Using Three-Dimensional Masking System
• Influence of Interlayer on Wear and Corrosion Resistance of DLC Film

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