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

The Korean Institute of Surface Engineering (한국표면공학회)
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Friction, Wear and Adhesion of HVOF Coating of Co-alloy Powder

  • Cho, Tong-Yul (School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Yoon, Jae-Hong (School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Song, Ki-Oh (School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Joo, Yun-Kon (School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Fang, Wei (School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Zhang, Shihong (School of Nano Advanced Materials Engineering, Changwon National University) ;
  • Youn, Suk-Jo (Sermatech Korea, LTD) ;
  • Chun, Hui-Gon (University of Ulsan) ;
  • Hwang, Soon-Young (Research Institute of Industrial Science and Technolog)
  • Published : 2007.11.12
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Abstract

HVOF thermal spray coating of micron size Co-alloy powder has been studied for the durability improvement of high velocity spindle (HVS). Optimal coating process of this system for the best surface properties is hydrogen flow rate 75 FMR, oxygen flow rate 38-42 FMR, feed rate 30 g/min at spray distance 5 inch. Friction coefficient (FC) and wear trace (WT) decrease increasing coating surface temperature from 25$^{\circ}$C to 538$^{\circ}$C due to the higher lubricant effects of the oxides at the higher temperature. At the study of adhesion of T800 coating on a light metal alloy Ti-6Al-4V (Ti64) tensile bond strength (TBS) and tensile fracture location (TFL) of Ti64/T800 are 8,740 psi and near middle of T800 coating respectively. This shows that adhesion of Ti64/T800 is higher than the cohesion strength (8,740 psi) of T800 coating. Therefore T800 coating is strongly advisable for the surface coating on HVS such as high speed air-bearing spindle.

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