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| Effect of Mo content on the microstructure, mechanical and tribological properties of CrAlMoN coatings |
BI Jianhaonan 1, ZHANG Yan 2,
WANG Zhenyu 2, ZHOU Shenghao 2,LIU Yongyue 3, ZHANG Xiaoyan 4, WANG Aiying 2
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1 College of Chemical Engineering, Zhejiang
University of Technology, Hangzhou 310014, China
2 Zhejiang Key Laboratory of Marine Materials and
Protection Technology, Key Laboratory of New Marine Materials and Application
Technology, CAS, Ningbo Institute of Materials Technology and Engineering,
Chinese Academy of Sciences, Ningbo 315201, China
3 Ningbo Heli Mould Technology Co. Ltd., Ningbo 315799,
China
4. Ningbo Tianzheng Mould Co.
Ltd., Ningbo, 315812, China
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Cite this article:
. Effect of Mo content on the microstructure, mechanical and tribological properties of CrAlMoN coatings. Acta Metall Sin, 0, (): 0-0.
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Abstract Coatings have gained significant attention in the fields of cutting tools and plastic injection moulds due to their high hardness, excellent thermal stability, and outstanding oxidation resistance. However, high friction and poor toughness make them apt to wom for the required harsh environment of aluminium-based alloy hot stamping die. Taking the conception of multiple alloying and high-throughput strategy, in this study, we fabricated the CrAlMoN soild solution coatings with different Mo components on H13 steel substrates using arc ion plating technology, the influence of Mo content on the microstructure, mechanical, and tribological properties of the coatings was systematically investigated. The results revealed that as the Mo content increased from 0.72 at. % to 19.47 at. %, the doped Mo atom were embedded in (Cr, Al) N lattice structure, which was a typical solid solution coatings accompanying with a small amount of formed Mo2N crystal phases. In particular, as the Mo content was about 2.55 at. %, the coatings exhibited the highest hardness (38.7±1.3 GPa) and elastic modulus (580.9±11.1 GPa), together with the excellent toughness arisen from the enhanced crack resistance. Moreover, based on the tribological experiments, the coatings possessed the remarkable wear resistance under room temperature, where the coefficient of friction (COF) spanned in a range from 0.32 to 0.51 and the wear rates varied at 5.9~10.88×10-7 mm3 N-1 m-1. The reason behind of this tribology behavior could be attributed to the formation of Magnéli-phase oxide MoO3, enabling a low shear capability during friction. Further increasing the Mo content to 19.47 at. % led to the improvement of tribological properties, as evidenced by an observation with the lowest COF at 0.31 and wear rate at 5.9×10-7 mm3 N-1 m-1. Microstructural evolution revealed that, as the formation of MoO3 phases were accumulated during friction, the subsequently tribological damage of coatings could be ascribed to the synergistic stimulation of abrasive wear and severe oxidation with slight pitting delamination of coating from substrates. However, it must be noted that the present results provide an alternatively promising strategy to design and fabricate the protective coatings like CrAlN-based coatings with the combined high-performance with hard yet tough as well as outstanding wear resistance.
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Received: 11 December 2023
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