| 超细/纳米结构WC-10Co-4Cr涂层的透射电镜表征与性能分析 |
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| 引用本文： | 王学政,王海滨,宋晓艳,刘雪梅,由德强,杨涛.超细/纳米结构WC-10Co-4Cr涂层的透射电镜表征与性能分析[J].稀有金属材料与工程,2017,46(3):704-710. |
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| 作者姓名： | 王学政 王海滨 宋晓艳 刘雪梅 由德强 杨涛 |
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| 作者单位： | 北京工业大学 材料科学与工程学院 新型功能材料教育部重点实验室,北京工业大学 材料科学与工程学院 新型功能材料教育部重点实验室,北京工业大学 材料科学与工程学院 新型功能材料教育部重点实验室,北京工业大学 材料科学与工程学院 新型功能材料教育部重点实验室,北京工业大学 材料科学与工程学院 新型功能材料教育部重点实验室,北京工业大学 材料科学与工程学院 新型功能材料教育部重点实验室 |
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| 基金项目： | 国家“863”计划主题项目 (项目号 SS2013AA031401),北京市自然科学基金重点项目(项目号2131001),北京市自然科学(项目号2154045) |
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| 摘 要： | 利用真空原位还原碳化反应合成超细/纳米WC-Co复合粉末,通过添加一定量Cr获得WC-10Co-4Cr复合粉末,经团聚造粒获得喷涂用复合粉末喂料,采用超音速火焰(HVOF)喷涂系统制备出超细/纳米结构的WC-10Co-4Cr涂层。利用X射线衍射仪,扫描电子显微镜和透射电子显微镜对涂层的物相、显微组织结构、元素分布特征等进行了系统表征,并对涂层耐磨性、耐蚀性进行了测试分析。结果表明:基于原位反应合成WC-Co复合粉制备的超细/纳米结构WC-10Co-4Cr涂层具有较好的耐磨性和耐腐蚀性。涂层以WC为主相,含有非晶结构的粘结相Co(Cr),同时存在少量六方晶体结构的W_2C相和非晶复相W_2C+Co(Cr)。对涂层中元素Co和Cr的分布进行了量化分析,得到其从WC晶粒到相界到共晶区再到Co区的变化规律。结合WC-10Co-4Cr复合粉末和超音速火焰喷涂工艺的特点,阐释了Cr在WC-10Co-4Cr涂层分布状态的形成原因,并讨论了对涂层性能的影响。
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| 关 键 词： | 原位合成 超音速火焰喷涂 超细/纳米结构WC-10Co-4Cr涂层 显微组织 |
| 收稿时间： | 2015/9/7 0:00:00 |
| 修稿时间： | 2015/11/13 0:00:00 |
TEM Characterization and Performance Analysis of Ultrafine / Nanostructured WC-10Co-4Cr Coating |
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| Wang Xuezheng,Wang Haibin,Song Xiaoyan,Liu Xuemei,You Deqiang and 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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| Authors: | Wang Xuezheng Wang Haibin Song Xiaoyan Liu Xuemei You Deqiang and Yang Tao |
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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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| 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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| Keywords: | in situ synthesis high velocity oxygen fuel ultrafine/nanostructured WC-10Co-4Cr coating microscopic structure |
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