Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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A Study on Friction and Wear Properties of Tetrahedral Amorphous Carbon Coatings on Various Counterpart Materials

  • Lim, Min Szan (Dept. of Mechanical Engineering, Universiti Malaysia Sabah) ;
  • Jang, Young-Jun (Tribology Laboratory, Aerospace Materials Center, Materials Processing Innovation Research Division, Korea Institute of Materials Science) ;
  • Kim, Jong-Kuk (Tribology Laboratory, Aerospace Materials Center, Materials Processing Innovation Research Division, Korea Institute of Materials Science) ;
  • Kim, Jong-Hyoung (Extreme Fabrication Technology Group, Daegyeong Division, Korea Institute of Industrial Technology) ;
  • Kim, Seock-Sam (Dept. of Mechanical Engineering, Universiti Malaysia Sabah)
  • Received : 2018.08.11
  • Accepted : 2018.11.24
  • Published : 2018.12.31
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Abstract

This research addresses the improvement of tribo-systems, specifically regarding the reduction of friction and wear through tribo-coupling between tetrahedral amorphous carbon (ta-C) with different types of counterpart materials, namely bearing steel (SUJ2), tungsten carbide (WC), stainless steel (SUS304), and alumina ($Al_2O_3$). A second variable in this project is the utilization of different values of duct bias voltage in the deposition of the ta-C coating - 0, 5, 10, 15, and 20 V. The results of this research are expected to determine the optimum duct bias and best counter materials associated with ta-C to produce the lowest friction and wear. Results obtained reveal that the tribo-couple between the ta-C coating and SUJ2 balls produces the lowest friction coefficient and wear rate. In terms of duct bias changes, deposition using 5 V produces the most optimum tribological behavior with lowest friction and wear on the tribo-system. In contrast, the tribo-couple between ta-C with a WC ball causes penetration through the coating surface layer and hence high surface delamination. This study demonstrates that the most effective ta-C coating duct bias is 5 V associated with SUJ2 counter material to produce the lowest friction and wear.

Keywords

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Fig. 1. Schematic illustration of ta-C coating with 90° type filtered cathode vacuum arc.

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Fig. 1. Schematic illustration of ta-C coating with 90° type filtered cathode vacuum arc.

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Fig. 2. Concept of duct bias in FCVA system.

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Fig. 2. Concept of duct bias in FCVA system.

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Fig. 3. Mechanical properties (hardness and Young’s modulus of ta-C coating as a function of duct bias.

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Fig. 3. Mechanical properties (hardness and Young’s modulus of ta-C coating as a function of duct bias.

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Fig. 4. Frictional behavior of ta-C coated samples with various ball materials.

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Fig. 4. Frictional behavior of ta-C coated samples with various ball materials.

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Fig. 5. Wear images for ta-C (5 V duct bias) tribo-couple with (a) SUJ2, (b) WC, (c) SUS304, and (d) Al2O3 balls.

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Fig. 5. Wear images for ta-C (5 V duct bias) tribo-couple with (a) SUJ2, (b) WC, (c) SUS304, and (d) Al2O3 balls.

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Fig. 6. Wear behavior of ta-C coated samples with various ball materials

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Fig. 6. Wear behavior of ta-C coated samples with various ball materials

Table 1. Thickness and wear depth after tribo-tests

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Table 1. Thickness and wear depth after tribo-tests

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Table 2. Mean contact pressure for ta-C coating tribocouples with different counterparts

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Table 2. Mean contact pressure for ta-C coating tribocouples with different counterparts

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