Tribology and Lubricants

  • 제20권5호
  • /
  • Pages.237-244
  • /
  • 2004
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  • 2713-8011(pISSN)
  • /
  • 2713-802X(eISSN)
한국트라이볼로지학회 (Korean Tribology Society)
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IBAD 방법으로 코팅된 PTFE 박막의 마이크로/나노 응착 및 마찰 특성

Micro/Nano Adhesion and Friction Characteristics of PTFE Coating Film Deposited by IBAD Method

  • 윤의성 (한국과학기술연구원 트라이볼로지 연구센터) ;
  • 오현진 (한국과학기술연구원 트라이볼로지 연구센터) ;
  • 한흥구 (한국과학기술연구원 트라이볼로지 연구센터) ;
  • 공호성 (한국과학기술연구원 트라이볼로지 연구센터) ;
  • 장경영 (한양대학교 기계공학부)
  • 발행 : 2004.10.01
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초록

Micro/nano tribological characteristics of PTFE coating films were experimentally studied. PTFE (polytetrafluoroethylene) modified polyethylene and low molecular weight PTFE were used as a coating materials. These films were deposited on Si-wafer (100) by IBAD (ion beam assisted deposition) method. The Ar ion beam sputtering was performed to change the surface topography of films using a hollow cathode ion gun under different Ar ion dose conditions in a vacuum chamber. Micro/nano tribological characteristics, water wetting angles and roughness were measured with a micro tribotester, SPM (scanning probe microscope), contact anglemeter and profilometer, respectively. The durability of the films were measured with macro tribotester. Results showed that the PTFE coating surfaces were converted to hydrophobic. The water contact angle of coated surfaces and surface roughness increased with the coating thickness. Adhesion and friction in micro and nano scale were governed by magnitude of normal load in soft material such as PTFE films. As the increase of sputtering time on low molecular weight PTFE films, the surface roughness was increased and nano adhesion and friction were decreased. The nano tribological characteristics of surfaces are mainly improved by chemical modification such as PTFE coating and given a synergy effect by the physical modification such as topographic modification.

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