Enhanced mechanical and tribological properties of V-Al-C coatings via increasing columnar boundaries
Enhanced mechanical and tribological properties of V-Al-C coatings via increasing columnar boundaries
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通过增加柱状边界增强 V-Al-C 涂层的机械和摩擦学性能
DOI：
10.1016/j.jallcom.2018.11.207
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发表时间：
2019-04
影响因子：
6.2
通讯作者：
Aiying Wang
中科院分区：
文献类型：
--
作者：
Zhenyu Wang;Hao Kang;Rende Chen;Peiling Ke;Aiying Wang
认为晶粒度、生长形态和晶界对硬质涂层的硬度和断裂韧性有影响。目前，一种有效的方法是通过晶界控制来裁剪它们的结构，从而提高它们的硬度和韧性。采用反应溅射法制备了不同CH4流量的V2AlC靶材，制备了具有不同结构的V-Al-C涂层。结果表明，当碳含量从37.32at.%增加到71.4at.%时，V-Al-C涂层的组织发生了从粗大的柱状晶到纤维状的柱状晶，再到由(V，Al)C纳米晶和富Sp2的a-C组成的纳米复合组织的转变。尤其是涂层呈纤维柱状组织时，硬度最高可达2 8.74 Gpa，韧性高达0.1 1，其良好的力学性能使磨损率最低为2.8 × 10−16m 3/Nm。相反，由于以非晶态碳为主要基质，纳米复合结构表现出较低的断裂抗力。所有纳米复合涂层的摩擦系数都很低，∼为0.18，这归因于摩擦过程中V2O5Magnéli相和无定形碳的耦合润滑。文中还讨论了增强的力学和摩擦学性能，即柱状晶界随碳含量的变化。
Grain size, growth morphology, and grain boundary were considered to affect hardness and fracture toughness of hard coatings. An effective approach is currently developed to improve their hardness and toughness via tailoring their architectures through grain boundary control. V-Al-C coatings consisting of variable architectures were prepared by reactive sputtering V2AlC target with different CH4flow rates in this study. The results indicated that, when the carbon content increased from 37.32 at.% to 71.4 at.%, the microstructure of V-Al-C coatings was tailored to span a wide changes from coarse columnar grain to fibrous columnar grains and finally to nanocomposite structure consisted of the (V, Al)C nanocrystallites and sp2-rich a-C. Especially, the maximum hardness of 28.74 GPa and the excellent toughness with high H/E value of 0.11 were obtained once the coating displayed fibrous columnar structure, such good mechanical properties benefited the lowest wear rate of 2.8 × 10−16m3/Nm. Instead, the nanocomposite structure showed the lower fracture resistance due to the dominated amorphous carbon matrix. All coatings with nanocomposite structure exhibited low friction coefficient of ∼0.18, which was attributed to the coupling lubrication originated from both V2O5Magnéli phases and amorphous carbon formed during friction process. The enhanced mechanical and tribological properties were also discussed in terms of the columnar boundaries evolution as a function of carbon content.
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DOI：
10.1016/j.ijrmhm.2017.11.027
发表时间：
2018-02
影响因子：
3.6
作者：
V. Moraes;H. Bolvardi;S. Kolozsvári;H. Riedl;P. Mayrhofer
通讯作者：
V. Moraes;H. Bolvardi;S. Kolozsvári;H. Riedl;P. Mayrhofer
坚硬而坚韧的 V-Al-C-N 纳米复合涂层：微观结构、机械和摩擦学性能
影响因子：
5.4
作者：
Wang Zhenyu;Li Xiaowei;Wang Xin;Cai Sheng;Ke Peiling;Wang Aiying
通讯作者：
Wang Aiying
影响因子：
5.4
作者：
J. C. Sánchez-López;D. Martinez-Martinez-D.-Martinez-Martinez-1404808168;C. López-Cartes;Asunción Fernández
通讯作者：
J. C. Sánchez-López;D. Martinez-Martinez-D.-Martinez-Martinez-1404808168;C. López-Cartes;Asunción Fernández
影响因子：
5.4
作者：
K. Yalamanchili;Rikard Forsén;E. Jiménez-Piqué;M. Jõesaar;J. Roa;N. Ghafoor;M. Odén
通讯作者：
K. Yalamanchili;Rikard Forsén;E. Jiménez-Piqué;M. Jõesaar;J. Roa;N. Ghafoor;M. Odén
影响因子：
5
作者：
M. Azzi;M. Benkahoul;J. Szpunar;J. Klemberg-Sapieha;L. Martinu
通讯作者：
M. Azzi;M. Benkahoul;J. Szpunar;J. Klemberg-Sapieha;L. Martinu