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Ni/Cu共掺CrBN涂层的韧性评价及压痕有限元仿真研究

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  • 南京航空航天大学机电学院
王谦之,博士,副教授,主要研究薄膜摩擦学、薄膜电化学、薄膜韧性等,E-mail: qz.wang@nuaa.edu.cn

收稿日期: 2021-08-24

  修回日期: 2021-09-23

  录用日期: 2021-10-27

  网络出版日期: 2023-12-25

基金资助

国家自然科学基金青年基金项目(51705245)资助

Study on Toughness Evaluation and Indentation Finite Element Simulation of the Ni/Cu Co-Doped CrBN Coatings

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  • School of Mechatronics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received date: 2021-08-24

  Revised date: 2021-09-23

  Accepted date: 2021-10-27

  Online published: 2023-12-25

摘要

为了研究金属Ni和Cu共掺对CrBN涂层韧性的影响,采用闭场式非平衡磁控溅射法制备了不同Ni/Cu比例的Ni-Cu-CrBN涂层。利用透射电子显微镜(TEM)对涂层的结构进行了分析,表明涂层是由CrN晶体和非晶基质组成的纳米复合结构。随着Ni含量的减少以及Cu含量的增加,CrBN涂层的硬度(H)从24.6 GPa下降到12.1 GPa,但塑性变形能力(Dp)以及抗环形裂纹能力有所增强。结合有限元模拟(FEM)分析,涂层抗环形裂纹能力的提高有3个原因:第1个最主要的原因是由于涂层和基体之间的性能差异减小,压痕下沉程度减弱;第2个原因是拉应力的分布逐渐均匀;第3个原因是随着Cu含量的不断增加提高了涂层的塑性变形能力。以上结果表明,涂层与基体间的力学性能相近,可以更加有效地抵抗环形裂纹的产生。

本文引用格式

周明玲, 王谦之 . Ni/Cu共掺CrBN涂层的韧性评价及压痕有限元仿真研究[J]. 材料保护, 2022 , 55(2) : 15 -21 . DOI: 10.16577/j.issn.1001-1560.2022.0032

Abstract

For studying the effect of metal Ni and Cu co-doping on the toughness of CrBN coating, Ni-Cu-CrBN coatings with different Ni/Cu ratios were prepared by closed field unbalanced magnetron ray method.The structure of the coating was analyzed using transmission electron microscopy(TEM), presenting that the coating was a nano-composite structure composing of CrN crystal and amorphous matrix.With decreasing Ni content and increasing Cu content, the hardness of CrBN coating(H)decreased from 24.6 GPa to 12.1 GPa, but plastic deformation capacity(Dp)as well as resistance to circle cracks was enhanced.Combined with finite element emodel(FEM)analysis, there were three reasons for the improvement of the ability of the coating to resist circle cracks.The first and main reason was the weakening degree of indentation sink-in condition due to smaller performance difference between the coating and substrate.The second reason was the more uniform distribution of the tensile stress.The third reason was the increasing plastic deformation ability of the coating with the increasing Cu content.The above results showed that the similar mechanical properties between the coating and the substrate could effectively resist the generation of circle cracks.
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