| WC-Co复合粉末的原位合成及于硬质合金涂层制备中的应用 |
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| 引用本文： | 王海滨,宋晓艳,刘雪梅,王学政,贺定勇. WC-Co复合粉末的原位合成及于硬质合金涂层制备中的应用[J]. 表面技术, 2016, 45(9): 10-17. DOI: 10.16490/j.cnki.issn.1001-3660.2016.09.002 |
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| 作者姓名： | 王海滨 宋晓艳 刘雪梅 王学政 贺定勇 |
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| 作者单位： | 北京工业大学材料科学与工程学院,北京,100124;北京工业大学材料科学与工程学院,北京,100124;北京工业大学材料科学与工程学院,北京,100124;北京工业大学材料科学与工程学院,北京,100124;北京工业大学材料科学与工程学院,北京,100124 |
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| 基金项目： | 863 计划主题项目 （2013AA032001）；国家杰出青年科学基金 （51425101）；北京市自然科学基金重点和青年基金项目 （2131001、2154045） |
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| 摘 要： | 目的为解决超细/纳米WC-Co热喷涂时易于脱碳等瓶颈问题,制备具有高的硬度、断裂韧性、耐磨性和表面质量等优异综合性能的超细及纳米结构硬质合金涂层,并推广其在工业领域中的应用。方法以原位合成技术批量制备的超细/纳米WC-Co复合粉末为原料,利用团聚造粒技术制备得到具有高球形度和致密性,并保持原有超细/纳米结构的喷涂喂料粉末,利用超音速火焰喷涂工艺制备低脱碳、高致密的超细结构WC基涂层。结果降低喂料粉末孔隙度可有效减少涂层中W2C等脱碳相的含量,在优化工艺下制备的超细结构WC基涂层的硬度达到1450HV0.3以上,韧性相对于常规微米结构涂层提高40%以上,在两种载荷和磨料条件下均表现出更高的耐磨性。结论利用原位反应技术批量合成的超细/纳米WC-Co复合粉制备的硬质合金涂层具有优良的综合性能,可应用于对涂层的硬度、耐磨性、强韧性配合和表面质量有较高要求的工况。
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| 关 键 词： | WC-Co复合粉 原位合成 团聚造粒 硬质合金涂层 韧性 耐磨性 |
| 收稿时间： | 2016-03-10 |
| 修稿时间： | 2016-09-20 |
Fabrication of Cemented Carbide Coating with In-situ Synthesized WC-Co Composite Powder |
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| WANG Hai-bin,SONG Xiao-yan,LIU Xue-mei,WANG Xue-zheng and HE Ding-yong. Fabrication of Cemented Carbide Coating with In-situ Synthesized WC-Co Composite Powder[J]. Surface Technology, 2016, 45(9): 10-17. DOI: 10.16490/j.cnki.issn.1001-3660.2016.09.002 |
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| Authors: | WANG Hai-bin SONG Xiao-yan LIU Xue-mei WANG Xue-zheng HE Ding-yong |
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| Affiliation: | College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China,College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China and College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China |
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| Abstract: | Objective This work aims at solving the problems that the ultrafine/nano WC-Co raw powders were easy to suffer from decarburization during thermal spraying and thus preparing the ultrafine/nanostructured cermet coatings with excellent comprehensive properties such as high hardness, toughness, wear resistance and surface quality for extending their applications in industries. Methods The ultrafine and nanoscale WC-Co composite powders were prepared in batch by the in-situ synthesis technique. Through a granulation process, the composite powders were agglomerated into the thermal spray feedstock powders, which had good spherical shape and high density while keeping the original ultrafine/nanostructures. After that, the ul-trafine-structured WC-based coating with low decarburization and high density was obtained using the high velocity oxy-fuel spraying. Results The content of W2C in the coating could be greatly decreased by reducing the porosity of the feedstock particles. By optimizing the spray parameters, the prepared ultrafine-structured coating had hardness above 1450 HV0.3, and toughness increased by over 40% as compared with the conventional micron-scaled coatings. Thus, the ultrafine-structured coating had better wear resistance at different testing conditions. Conclusion The cemented carbide coatings prepared by using the ultrafine or nanoscale WC-Co composite powders with the in-situ synthesis technique have excellent comprehensive properties. The composite powders are applicable to prepare coatings that meet demands of high hardness, wear resistance, toughness and surface quality as high-quality spraying materials. |
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| Keywords: | WC-Co composite powder in-situ synthesis granulation cemented carbide coating toughness wear resistance |
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