Abstract No.:
2974

 Scheduled at:
Thursday, September 29, 2011, Saal C2.1 9:00 AM
Tribological Coatings 2


 Title:
Improved microstructure and properties of HVOF sprayed cermet coatings modified by laser remelting post-treatment

 Authors:
Zhi-Jian Yin* / Institute of Surface Technology, Baosteel Equipment Maintenance Co., Ltd., China
XinHai Tan / Institute of Science Technology, Baosteel Equipment Maintenance Co., Ltd.,, China
QiLin Deng/ School of Mechanical Engineering, Shanghai Jiao Tong University, China
ChaoXiong Li/ Institute of Science Technology, Baosteel Equipment Maintenance Co., Ltd.,, China
Wei Fu/ Institute of Science Technology, Baosteel Equipment Maintenance Co., Ltd.,, China
Shubao Wang/ Institute of Science Technology, Baosteel Equipment Maintenance Co., Ltd.,, China
ShunYan Tao/ The Key Laboratory of Inorganic Coating Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences,

 Abstract:
In this study, carbide-based cermet (WC-Co, Cr3C2-NiCr) and stellite alloy mixed with WC coatings were deposited by HVOF and efforts were made to determine the laser remelting effects on the coatings microstructure, hardness and tribological behavior in dry and high temperature corrosive conditions. The results indicated that laser post-treatment employing the selected parameters allows the quality improvement of HVOF sprayed coating and the elimination of its porosity, in addition to enforced metallurgical fusion between coating and substrate. Laser remelting effects on mechanical properties of coatings also show dependence on carbide hard phase size and microstructural characteristics of ultimate coating. Under dry friction-wear test, the micro-cracks on the worn surface of HVOF-sprayed coatings occurred and the adhesive transferred from friction pair to the coating surface. No micro-cracking on the worn surface of laser treated coatings has been found and their improved dry wear resistance obtained. In high temperature corisive condition, laser post-treated coatings show better corrosion and wear resistance, particularly for the WC-12%Co coatings.

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