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超細/納米結(jié)構(gòu)WC-10Co-4Cr涂層的透射電鏡表征與性能分析
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北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點實驗室,北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點實驗室,北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點實驗室,北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點實驗室,北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點實驗室,北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院 新型功能材料教育部重點實驗室

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國家“863”計劃主題項目 (項目號 SS2013AA031401),北京市自然科學(xué)基金重點項目(項目號2131001),北京市自然科學(xué)(項目號2154045)


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

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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    摘要:

    本文利用真空原位還原碳化反應(yīng)制得超細/納米WC-10Co-4Cr復(fù)合粉末，經(jīng)團聚造粒獲得噴涂用復(fù)合粉末喂料，采用超音速火焰系統(tǒng)（HVOF）制備出超細/納米結(jié)構(gòu)的WC-10Co-4Cr涂層。利用結(jié)合X射線衍射和透射電子顯微鏡對涂層的物相、顯微組織結(jié)構(gòu)、元素分布特征等進行了系統(tǒng)表征，并對涂層耐磨性、耐蝕性進行了測試分析。結(jié)果表明：采用原位反應(yīng)合成的超細/納米WC-10Co-4Cr復(fù)合粉末制備的超細/納米結(jié)構(gòu)的WC-10Co-4Cr涂層，具有優(yōu)良的耐磨性和耐腐蝕性。涂層以WC為主相，含有非晶結(jié)構(gòu)的粘結(jié)相Co(Cr)，同時存在少量六方晶體結(jié)構(gòu)的W2C相和非晶復(fù)相W2C Co(Cr)。對涂層中元素Co和Cr的分布進行了量化分析，得到其從WC晶粒到相界到共晶區(qū)再到Co區(qū)的變化規(guī)律。結(jié)合WC-10Co-4Cr復(fù)合粉末和超音速火焰噴涂工藝的特點，闡釋了Cr在WC-10Co-4Cr涂層分布狀態(tài)的形成原因，并討論了對涂層性能的影響。

    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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王學(xué)政,王海濱,宋曉艷,劉雪梅,由德強,楊濤.超細/納米結(jié)構(gòu)WC-10Co-4Cr涂層的透射電鏡表征與性能分析[J].稀有金屬材料與工程,2017,46(3):704~710.[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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  • 收稿日期:2015-09-07
  • 最后修改日期:2015-11-13
  • 錄用日期:2015-12-08
  • 在線發(fā)布日期: 2017-05-18
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