• Title/Summary/Keyword: 트라이볼로지

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Tribological Properties of Carbon Nanotube Thin Films by using Electrodynamic Spraying Method (전기 분사 증착 방식을 이용한 탄소 나노 튜브 박막의 트라이볼로지적 특성에 관한 연구)

  • Kim, Chang-Lae;Kim, Dae-Eun;Kim, Hae-Jin
    • Tribology and Lubricants
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    • v.34 no.6
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    • pp.313-317
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    • 2018

  • Carbon-based coatings, including carbon nanotubes (CNTs), graphene, and buckyball ($C_{60}$), receive much interest because of their outstanding mechanical and electrical properties for a wide range of electromechanical component-based applications. Previous experimental results demonstrate that these carbon-based coatings are promising solid lubricants because of their superior tribological properties, and thus help prolong the lifetime of silicon-based applications. In this study, CNT coatings are deposited on a bare silicon (100) substrate by electrodynamic spraying under different deposition conditions. During the coating deposition, the applied voltage, CNT concentration of the solution, distance between the injecting nozzle and the substrate and diameter of the injecting nozzle are optimized to control the thickness and surface roughness of the CNT coatings. The surface morphology and thickness of the coatings are characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), respectively. The friction and wear properties of the coatings are investigated by using a pin-on-reciprocating-type tribotester under various experimental conditions. The friction coefficient of the CNT coating is as low as 0.15 under high normal loads. The overall results reveal that CNT coatings deposited by electrodynamic spraying provide relatively uniform with superior lubrication performance.

  • https://doi.org/10.9725/kts.2018.34.6.313 인용 PDF KSCI HTML

A Study on the Tribological Characteristics of PTFE Composites-filled with Nano CuO Particles Under a Slow Sliding Speed and Low Load Condition (나노 CuO입자로 충진된 PTFE 나노복합소재의 저속 및 하중 조건에서의 트라이볼로지 특성에 관한 연구)

  • Minhaeng Cho;Junghwan Kim
    • Tribology and Lubricants
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    • v.39 no.3
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    • pp.111-117
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    • 2023

  • This paper presents an experimental investigation of the tribological characteristics of PTFE composites filled with nano CuO particles under low sliding speed and load. All the specimens were prepared by sintering. Before sintering, the mixture of PTFE powder and CuO particles were mixed by a high-speed mixer using CuO volume fractions of 0.2 vol. % and 5 vol. %. Each mixture was sintered at 350 ℃ for 30 min on the steel disk. We conducted ball-on-disk sliding test an hour using a steel ball against PTFE composites, including pure PTFE. The load and sliding speed used was 2 N and 0.01 m/s, respectively. Adding nano CuO particles increases the friction coefficient because of the abrasiveness of hard nano CuO particles. The highest coefficient of frictions was obtained from 5 vol. % CuO. Conversely, the lowest wear of the composites was obtained from the 5 vol. % CuO nanocomposite. This study reveals that the addition of nano CuO particles can lower the wear of PTFE, despite an increase in the coefficient of friction. However, the coefficient friction is still moderate compared to other engineering polymers. In addition, the amount of CuO nano particles has to be optimized to reduce friction and wear at the same time.

  • https://doi.org/10.9725/kts.2023.39.3.111 인용 PDF HTML

Effects of Temperature on Tribological Properties of Polymer Material (온도 조건에 따른 폴리머 소재의 트라이볼로지 특성 연구)

  • Chi-Yoon An;Dae-Eun Kim
    • Tribology and Lubricants
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    • v.39 no.6
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    • pp.262-267
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    • 2023

  • Research to replace metal mechanical elements with polymer materials has recently accelerated. However, polymers exhibit less favorable mechanical properties than metal materials, and are often easily worn-out owing to frictional heat when their mechanical elements contact while in relative motion. Therefore, research on the polymer tribological properties is required to employ polymer materials in mechanical elements operating under harsh conditions. In this study, we examine the effect of mechanical part operating temperatures on the material friction and wear characteristics of polymer materials. We conduct ball-on-disk friction tests under dry conditions at various temperatures, using a metal ball with high hardness and a polymer as the counter surface. Each test is repeated at least three times to ensure the reliability of the test results. Before the friction test, we analyze the surface hardness and roughness of each polymer specimen; after the friction test, we use a three-dimensional confocal microscope to compare and analyze the polymer specimen wear characteristics. Based on this study, we systematically elucidate the polymer material tribological characteristics. This information should be useful for selecting and utilizing polymer materials at various temperatures.

  • https://doi.org/10.9725/kts.2023.39.6.262 인용 PDF HTML