Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403

공학

한국표면공학회지 (39권6호 295-301)

Comparison of HVOF Thermal Spray Coatings of T800 and WC-Co Powders


Cho, T.Y.;Yoon, J.H.;Kim, K.S.;Baek, N.K.;Song, K.O.;Youn, S.J.;Hwang, S.Y.;Chun, H.G.;


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

Abstract

Hard chrome plating has been used in surface hard coating over 50 years both for applying hard coating and re-building of worn components. Hard chrome plating solution and mist pollute environment with very toxic $Cr^{6+}$(hex-Cr) known as carcinogen which causes lung cancer, High velocity oxy-fuel (HVOF) thermal spray coatings of WC base cermet and Co-alloy powders are the most promising candidates for the replacement of the traditional hard chrome plating. Surface properties, wear, and friction behaviors of micron size Co-alloy (T800) and micron size WC-l2Co (WC-Co) have been studied for the application as hard coatings. The temperature dependence of wear and friction behaviors of T800 and WC-Co have been investigated at the temperature of $25^{circ}C$ and $538^{circ}C$ for the application to high speed spindle.

Keywords

HVOF;WC-Co;T800;Thermal spray coating;Oxidation and abrasive wear assisted by oxide lubrication;Adhesion;