Proceedings of the Korean Institute of Surface Engineering Conference (한국표면공학회:학술대회논문집)

The Korean Institute of Surface Engineering (한국표면공학회)
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Surface Properties, Friction, Wear Behaviors of the HOVF Coating of T800 Powder and Tensile Bond Strength of the Coating on Ti64

  • Cho, T.Y. (RTI 04-01-03 "K-MEM R&D Cluster", School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Yoon, J.H. (RTI 04-01-03 "K-MEM R&D Cluster", School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Joo, Y.K. (RTI 04-01-03 "K-MEM R&D Cluster", School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Cho, J.Y. (RTI 04-01-03 "K-MEM R&D Cluster", School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Zhang, S.H. (RTI 04-01-03 "K-MEM R&D Cluster", School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Kang, J.H. (RTI 04-01-03 "K-MEM R&D Cluster", School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Chun, H.G. (School of Materials Science and Engineering, University of Ulsan) ;
  • Kwon, S.C. (Korea Institute of Materials Science)
  • Published : 2008.11.19
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Abstract

Micron-sized Co-alloy T800 powder was coated on Inconel718 (IN718) using high velocity oxygen fuel (HVOF) thermal spraying by the optimal coating process (OCP) determined from the best surface hardness of 16 coatings prepared by Taguchi program. The surface hardness improved 140-160 % from 399 Hv of IN718 to 560-630 Hv by the coating. Porosity of the coating was 1.0-2.7 %, strongly depending on spray parameters. Both friction coefficients (FC) and wear traces (WT) of the coating were smaller than those of IN718 substrate at both $25^{\circ}C$ and $538^{\circ}C$. FC and WT of IN718 and coating decreased with increasing the surface temperature. Tensile bond strength (TBS) and fracture location (FL) of Ti64/T800 were 8,770 psi and near middle of T800 coating respectively. TBS and FL of Ti64/NiCr/T800 were 8,740 psi and near middle of T800 coating respectively. This showed that cohesion of T800 coating was 8,740-8,770 psi, and adhesion of T800 on Ti64 and NiCr was stronger than the cohesion of T800.

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