期刊
APPLIED SURFACE SCIENCE
卷 599, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2022.153804
关键词
Ni; Cu doping; CrBN coating; Hardness; Toughness; FEM
类别
资金
- National Natural Science Founda-tion of China [51705245]
- National Key Laboratory of Science and Technology on Helicopter Transmission, Nanjing University of Aeronautics and Astronautics [HTL-A-20G06]
By increasing the Ni or Cu content, the hardness of CrBN coatings decreased while the resistance to circle cracks was enhanced, due to the weakening of sink-in condition, even distribution of tensile stress, and enhanced plastic deformation ability after Ni or Cu incorporation.
By adjusting the current of NiCr or Cu target (0.4-2.0 A), the CrBN-Ni and CrBN-Cu coatings with different Ni (4.35-19.62 at.%) or Cu contents (3.7-19.06 at.%) were deposited to compare the toughening effect of Ni or Cu. The results showed that as Ni or Cu content increasing, the hardness (H) of CrBN coatings decreased from 38.1 to 11.7 GPa, but the resistance to circle cracks was enhanced. By combining the results of experiments and finite element method (FEM), three reasons contributed to the enhanced resistance to circle cracks. The first and major reason was the weakening degree of sink-in condition. The second reason was the even distribution of tensile stress. The third reason was the enhanced plastic deformation ability after Ni or Cu incorporation. The above results indicated that the good matching of mechanical properties between coating and substrate was prone to resisting cracks.
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