Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Improvement of Surface Properties of CP-Titanium by Thermo-Chemical Treatment (TCT) Process

열확산처리 공정에 의한 순수 타이타늄의 표면특성 향상 연구

  • Jeong, Hyeon-Gyeong (i-Cube center, Engineering and Research Institute, Gyeongsang National University) ;
  • Lee, Dong-Geun (Special Alloys Research Group, Korea Institute of Materials Science) ;
  • Yaskiv, O. (Physico-Chemical Institute) ;
  • Lee, Yong-Tai (Special Alloys Research Group, Korea Institute of Materials Science) ;
  • Hur, Bo-Young (i-Cube center, Engineering and Research Institute, Gyeongsang National University)
  • 정현경 (경상대학교, ERI, i-Cube) ;
  • 이동근 (재료연구소 특수합금연구그룹) ;
  • ;
  • 이용태 (재료연구소 특수합금연구그룹) ;
  • 허보영 (경상대학교, ERI, i-Cube)
  • Received : 2011.03.11
  • Published : 2011.09.25
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Abstract

The thermo-chemical treatment (TCT) process was applied to achieve surface hardening of CP titanium. The following three different surface modification conditions were tested so that the best surface hardening process could be selected:(a) PVD, (b) TCT+PVD, and (c) TCT+Aging+PVD. These specimens were tested and analyzed in terms of surface roughness, wear, friction coefficient, and the gradient of hardening from the surface of the matrix. The three test conditions were all beneficial to improve the surface hardness of CP titanium. Moreover, the TCT treated specimens, that is, (b) and (c), showed significantly improved surface hardness and low friction coefficients through the thickness up to $100{\mu}m$. This is due to the functionally gradient hardened surface improvement by the diffused interstitial elements. The hardened surface also showed improvement in bonding between the PVD and TCT surface, and this leads to improvement in wear resistance. However, TCT after aging treatment did not show much improvement in surface properties compared to TCT only. For the best surface hardening on CP titanium, TCT+PVD has advantages in surface durability and economics.

Keywords

Acknowledgement

Supported by : 지식경제부, 교육과학기술부

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