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Friction Transition Diagram Considering the Effects of Oxide Layer Formed on Contact Parts of TiN Coated Ball and Steel Disk in Sliding

미끄럼운동시 TiN코팅볼과 스틸디스크의 미끄럼접촉면에 형성되는 산화막의 영향을 고려한 마찰천이선도 작성에 대한 연구

  • 조정우 (성균관대학교 기계공학부) ;
  • 박동신 (성균관대학교 기계공학부) ;
  • 이영제 (성균관대학교 기계공학부)
  • Published : 2003.03.01

Abstract

In this study, the effects of oxide layer formed on the contact parts of TiN coated ball and steel disk in sliding are investigated. Also wear mechanism to from the oxide layer and the characteristics of the oxide layer formation are investigated. AISI 52100 steel ball is used for the substrate of coated ball specimens. Two types of coated ball specimens were prepared by depositing TiN coating with 1 and 4 ${\mu}{\textrm}{m}$ in coating thickness. AISI 1045 steel is used for the disk type counter-body. To investigate the effect of oxide layer on the contact parts of the two materials, the tests were performed both in air for forming oxide layer on the contact parts and in nitrogen environment to avoid oxidation. And to study the effects of surface roughness of counter-body, TiN coating thickness and contact load of sliding test on the characteristics of oxide layer formation on counter-body, various tests were carried out. From the results, the friction characteristics between the two materials was predominated by iron oxide layer that formed on wear track on counter-body and this layer caused the high friction. And the formation rate of the oxide layer on wear track increased as the real contact area between the two materials increased as the contact load increased, the TiN coating thickness decreased and the surface of counter-body smoothened.

Keywords

Oxide Layer;TiN Coated Ball;Adhesive Wear;Real Contact Area;Friction Transition Diagram

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