TEM Characterization and Performance Analysis of Ultrafine / Nanostructured WC-10Co-4Cr Coating

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TEM Characterization and Performance Analysis of Ultrafine / Nanostructured WC-10Co-4Cr Coating
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Affiliation:College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology,College of Materials Science and Engineering,Key Laboratory of Advanced Functional Materials,Education Ministry of China,Beijing University of Technology
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Fund Project:National Natural Science Foundation of China (50872116, 11004162, 11104224); Research Fund for the Doctoral Program of Higher Education of China (20110184120029); Fundamental Research Funds for the Central Universities (SWJTU11BR063, 2682013CX004, 2682013ZT16, SWJTU11ZT31); National Magnetic Confinement Fusion Science Program (2011GB112001); Program of International S&T Cooperation (2013DFA51050)

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Abstract:

The ultrafine/nanostructured WC-10Co-4Cr composite powder was synthesized by reduction and carburization reactions, the composite powder was agglomerated to prepare the composite powder feeding that was used in spraying, then the ultrafine/nanostructured WC-10Co-4Cr coating was prepared by high velocity oxygen fuel (HVOF). The phases, elemental distribution and microstructure of the coating were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM), and then the wear resistance and corrosion resistance of the coating were tested. The results show that the main phases of the coating is WC , binding phase of amorphous structure is Co(Cr), and there is a little W₂C phase of hexagonal crystal structure and W₂C Co(Cr) multiphase of amorphous coexisting. The change rule of WC grain were obtained from phase boundary to eutectic area to Co area by the quantitative analysis of distribution of Co and Cr element in coating. Combined WC-10Co-4Cr composite powder and process characteristics of HVOF, explain the causes of Cr in the WC-10Co-4Cr coating distribution, and discusses the impact on the coating performance.

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[Wang Xuezheng, Wang Haibin, Song Xiaoyan, Liu Xuemei, You Deqiang, Yang Tao. TEM Characterization and Performance Analysis of Ultrafine / Nanostructured WC-10Co-4Cr Coating[J]. Rare Metal Materials and Engineering,2017,46(3):704~710.]
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Received:September 07,2015
Revised:November 13,2015
Adopted:December 08,2015
Online: May 18,2017
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