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Effect of specimen orientation and heat treatment on electroless Ni-PTFE-MoS 2 composite coatings

Mohammadi, M ; Sharif University of Technology | 2010

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  1. Type of Document: Article
  2. DOI: 10.1007/s11998-010-9255-4
  3. Publisher: 2010
  4. Abstract:
  5. In this study, the effects of simultaneous co-deposition of polytetrafluoroethylene (PTFE) and MoS 2 particles on tribological properties of electroless nickel (EN) coating were studied. The influences of specimen orientation and heat treatment on EN-PTFE-MoS 2 composite coatings were also investigated. Scanning electron microscopy was used to study the morphology of coatings and the distributions of the lubricant particles in the deposits. Chemical analyses of coatings were done by electron dispersive spectrometry. The phases of the coatings were identified by X-ray diffraction utilizing CuKα radiation. Wear and friction properties of the coatings were also determined by pin-on-disk wear tester. The wear investigations showed that the EN-PTFE-MoS 2 composite coating performs better than EN-PTFE and EN-MoS 2 coatings in terms of friction coefficient and wear resistance. PTFE and MoS 2 contents of the EN-PTFE-MoS 2 coating were increased by changing the specimen orientation from vertical to horizontal configuration, which leads to enhancement in tribological properties of the coating. After heat treatment, the wear rate of EN matrix composite coating decreased with corresponding change in phase structure
  6. Keywords:
  7. After-heat treatment ; Codeposition ; Electroless Ni ; Electroless nickel ; Electroless nickel coatings ; Friction coefficients ; Pin on disk ; Specimen orientation ; Tribological properties ; Wear and friction ; Wear rates ; Wear tester ; Chemical analysis ; Friction ; Heat treatment ; Molybdenum compounds ; Nickel ; Nickel coatings ; Scanning electron microscopy ; Solid lubricants ; Tribology ; Wear resistance ; X ray diffraction ; Composite coatings
  8. Source: Journal of Coatings Technology Research ; Volume 7, Issue 6 , November , 2010 , Pages 697-702 ; 15470091 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs11998-010-9255-4