• Title/Summary/Keyword: coefficient of frication

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Effects of Composition Ratio and Temperature on Friction and Wear of PTFE-Polyimide Composites (PTFE-폴리이미드 복합 재료의 마찰과 마모에 대한 성분비와 온도의 영향)

  • 심현해;권오관;이규한;김병환
    • Tribology and Lubricants
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    • v.12 no.3
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    • pp.55-62
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    • 1996
  • Present study was undertaken to investigate the effects of composition ratio and temperature on the friction and wear of PTFE-polyimide composites under the atmosphere of nitrogen gas. The load range was 0.62-3.46 MPa, and the temperature range was room temperature and 200$^{\circ}$C. To mention some of the notable results, friction coefficient of PTFE 100% varied relatively little within the given load and temperature ranges. Polyimide 100% showed the lowest friction coefficient of 0.06 at 200$^{\circ}$C among all the experiments. PTFE 80%-polyimide 20% showed the lowest wear factors on the whole. Friction coefficient of PTFE 20%-polyimide 80% varied from the highest 0.35 to the lowest 0.09 among all the materials at room temperature, and showed almost the same lowest values with polyimide 100% at 200$^{\circ}$C. Suggestion of friction and wear mechanisms of the materials was tried to explain the observed phenomena including above mentioned results.

Effect of MoS$_2$ and $Fe_2O_3$ Additives on the Tribological Behavior of the Plasma Sprayed Zirconia Based Coatings (MoS$_2$$Fe_2O_3$ 첨가제가 지르코니아계 용사코팅층의 마모마찰 특성에 미치는 영향)

  • 신종한;임대순;안효석
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 1997.10a
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    • pp.93-99
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    • 1997
  • High Temperature wear behavior of plasma sprayed ZrO$_2$ and MoS$_2$, $Fe_2O_3$ coatings were investigated for high temperature wear resistance applications. The MoS$_2$, $Fe_2O_3$ added powders containing 2.5, 5.0, 7.5, 10.0 mol% of $MoS_2$, $Fe_2O_3$ for plasma spray were made by spray drying method. Wear test were performed at temperature ranges from room temperature to 600$\circ$C. The microstructural change of coatings and the worn. surface were examined by SEM and XRD. In ZrO$_2$ coating, the coefficient of friction and wear amount of room temperature to 400$\circ$C was increased with temperature and decreased with temperature over 400$\circ$C. The coefficient of friction and wear amount of MoS$_2$ added coatings were increased with temperature, but those of $Fe_2O_3$ added coatings had lower coefficient of friction and higher wear resistance than ZrO$_2$ coating.

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