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Microstructure and superhardness effect of VC/TiC superlattice films

Transactions of Nonferrous Metals Society of China 2015年第8期25卷 2581-2586页

作者：董学超岳建岭王恩青李淼磊李戈扬中南大学航空航天学院长沙410083 中南大学粉末冶金国家重点实验室长沙410083 上海交通大学金属基复合材料国家重点实验室上海200030

Vanadium carbide/titanium carbide （VC/TiC） superlattice films were synthesized by magnetron sputtering method. The effects of modulation period on the microstructure evolution and mechanical properties were investigated by EDXA, XRD, HRTEM and nano-indentation. The results reveal that the VC/TiC superlattice films form an epitaxial structure when their modulation period is less than a critical value, accompanied with a remarkable increase in hardness. Further increasing the modulation period, the hardness of superlattices decreases slowly to the rule-of-mixture value due to the destruction of epitaxial structures. The XRD results reveal that three-directional strains are generated in superlattices when the epitaxial structure is formed, which may change the modulus of constituent layers. This may explain the remarkable hardness enhancement of VC/TiC superlattices.

关键词： superlattice films carbide films microstructure evolution superhardness effect epitaxial growth

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Microstructure and mechanical properties of VAlN/Si_(3)N_(4) nano-multilayer coatings

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Journal of Central South University 2022年第5期29卷 1403-1411页

作者： TAO Xian-cheng LOU Yu-min LI Miao-lei ZHAO Ning-ning TANG Xiu-zhi HU Hai-long HUANG Xiao-zhong YUE Jian-ling State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Hunan Key Laboratory of Advanced Fibers and Composites Central South UniversityChangsha 410083China Zhejiang Energy Group R&D Institute Co. Ltd.Hangzhou 310000China Institute of Aeronautics and Astronautics Central South UniversityChangsha 410012China

VAlN coating is of particular interest for dry cutting applications owing to its low-friction and excellent ***-multilayer structure is designed to tailor the properties of VAlN *** this work,a series of VAlN/Si_(3)N_(4) nano-multilayer coatings with varied Si_(3)N_(4) layer thicknesses were prepared by reactive sputtering *** microstructure and mechanical properties of the coatings were both *** is revealed that Si_(3)N_(4) with a shallow thickness(~0.4 nm)was crystallized and grown coherently with VAlN,showing a remarkable increase in hardness compared to VAlN monolayer *** hardness of coherently VAlN/Si_(3)N_(4) nano-multilayer coatings reached to 48.7 *** further increase of Si_(3)N_(4) layer thickness,the coherent growth of nano-multilayers was terminated,showing amorphous structure formed in nano-multilayers and the hardness was *** the other hand,when Si_(3)N_(4) layer thickness was 0.4 nm,the friction coefficient of VAlN/Si_(3)N_(4) nano-multilayer coating was almost equal to that of VAlN monolayer coating,which was attributed to the crystallization of Si_(3)N_(4) and the produced coherent interfaces between VAlN and Si_(3)N_(4) for the hardening effect of nano-multilayer *** further increase of Si_(3)N_(4) layer thickness,pronounced improvement of friction coefficient in VAlN/Si_(3)N_(4) nano-multilayer coating was observed.

关键词： VAlN/Si_(3)N_(4) nano-multilayer coatings mechanical properties microstructure superhardness effect

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