Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


공학

한국표면공학회지 (39권5호 240-244)

A Study on the Friction and Wear Properties of Tribaloy 800 Coating by HVOF Thermal Spraying

A Study on the Friction and Wear Properties of Tribaloy 800 Coating by HVOF Thermal Spraying

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Cho, Tong-Yul;Yoon, Jae-Hong;Kim, Kil-Su;Youn, Suk-Jo;Song, Ki-Oh;Back, Nam-Ki;Chun, Hui-Gon;Hwang, Soon-Young;

School of Nano Advanced Materials Engineering, Changwon National University;Sermatech Korea, Ltd.;Research Institute of Naval Technology;School of Material Science and Engineering, University of Ulsan;Research Institute of Industrial Science & Technology;
School of Nano Advanced Materials Engineering, Changwon National University;Sermatech Korea, Ltd.;Research Institute of Naval Technology;School of Material Science and Engineering, University of Ulsan;Research Institute of Industrial Science & Technology;

Abstract

Tribaloy 800 (T800) powder is coated on the Inconel 718 substrate by the optimal High Velocity Oxy-Fuel (HVOF) thermal spray coating process developed by this laboratory. For the study of the possibility of replacing of the widely used classical chrome plating, friction, wear properties and sliding wear mechanism of coatings are investigated using reciprocating sliding tester both at room and at an elevated temperature of $1000^{circ}F;(538^{circ}C). Both at room temperature and at $538^{circ}C$, friction coefficients and wear debris of coatings are drastically reduced compared to those of non-coated surface of Inconel 718 substrate. Friction coefficients and wear traces of both coated and non-coated surfaces are drastically reduced at higher temperature of $538^{circ}C$ compared with those at room temperature. At high temperature, the brittle oxides such as $CoO,;Co_3O_4,;MoO_2,;MoO_3$ are formed rapidly on the sliding surfaces, and the brittle oxide phases are easily attrited by reciprocating slides at high temperature through complicated mixed wear mechanisms. The sliding surfaces are worn by the mixed mechanisms such as oxidative wear, abrasion, slurry erosion. The brittle oxide particles and melts and partial-melts play roles as solid and liquid lubricant reducing friction coefficient and wear. These show that the coating is highly recommendable for the durability improvement coating on the surfaces vulnerable to frictional heat and wear.

Keywords

Sliding wear test;Slurry erosion;Melts and partial-melts;Solid and liquid lubricant;