Deposition and characterization of WC-Co hard-metal coatings by high velocity oxy-fuel process combined with dry-ice blasting

被引：7
作者：
Dong, Shujuan [1 ]
Zeng, Jinyan [1 ]
Liao, Hanlin [2 ]
机构：
[1] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
[2] Univ Bourgogne Franche Comte, IRTES EA7274, F-90100 Belfort, France
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2017年 / 64卷
基金：
中国国家自然科学基金;
关键词：
High-velocity oxy-fuel; Dry-ice blasting; WC-Co coating; Microstructure; Phase; Wear; THERMALLY SPRAYED COATINGS; CARBIDE GRAIN-SIZE; RESIDUAL-STRESS; WEAR-RESISTANCE; MECHANICAL-PROPERTIES; CERMET COATINGS; HVOF; MICROSTRUCTURE; BEHAVIOR; CORROSION;
D O I：
10.1016/j.ijrmhm.2016.12.007
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The residual stresses arising during high velocity oxy-fuel (HVOF) process usually restrict the building up of thick coatings. The potential of in-situ dry-ice blasting treatment during HVOF process to deposit thick WC-Co coatings with high quality due to its efficient cooling and mechanical peening was investigated in the present work. Characterization of WC-Co coatings deposited by HVOF combined with dry-ice blasting was carried out and compared with that of the coatings prepared using conventional HVOF. Several techniques, including scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy, were used to characterize the microstructures and phase distribution of the powders and coatings. In addition, mechanical properties such as hardness and sliding wear resistance were evaluated. The results demonstrate that HVOF-sprayed WC-Co coating with dry-ice blasting is characterized by compact construction, grain refinement as well as high hardness. Different from the prevention phenomenon of decarburization observed for plasma spraying of austenitic steel, WC de carburization still occurs for HVOF-sprayed WC-Co coating with dry-ice blasting. The in-situ dry-ice blasting treatment results in minute improvement in wear resistance of WC-Co coatings. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：151 / 159
页数：9
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