Structural optimisation and synthesis of multilayers and nanocomposite AlCrTiSiN coatings for excellent machinability
Structural optimisation and synthesis of multilayers and nanocomposite AlCrTiSiN coatings for excellent machinability
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DOI：
10.1016/j.surfcoat.2015.07.033
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发表时间：
2015-09-15
影响因子：
5.4
通讯作者：
Yang, Shubao
中科院分区：
文献类型：
--
作者：
Zhang, Shihong;Wu, Weiwei;Yang, Shubao
本文在AlCrN涂层的基础上，设计了AlTiSiN和AlCrTiSiN多层及纳米复合涂层，并利用阴极真空弧法在高速钢试件和刀具上沉积了AlTiSiN和AlCrTiSiN多层及纳米复合涂层。采用掠入射X射线衍射仪(GIXRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和高分辨透射电子显微镜(HRTEM)对涂层的微观结构进行了分析，并结合机械性能表征和用于检验涂层刀具使用寿命的切割试验对涂层进行了分析。结果表明，AlTiSiN涂层由纳米晶TiN和HCP-AlN组成。AlCrTiSiN多层膜和纳米复合涂层由面心立方结构(Fcc)的TiN和CrN的(111)、(200)和(220)面和纳米晶的fcc-(Cr，Al)N相组成。与AlTiSiN涂层相比，AlCrTiSiN涂层具有更强的(200)衍射峰。涂层为纳米复合结构的超晶格结构，由纳米晶和非晶相组成。AlCrTiSiN涂层的调制周期(7 Nm)远小于AlTiSiN涂层的调制周期(12 Nm)。AlCrTiSiN涂层中存在一种特殊的Cr2N颗粒相。与AlCrN涂层相比，AlCrTiSiN涂层刀具的使用寿命提高了约50%，这是因为其具有优异的机械性能(41.14 Gpa硬度、1.07 Gpa韧性、60N Lc2结合强度、0.2平均摩擦系数和36.5 nm(Ra)粗糙度)。(C)2015爱思唯尔B.V.保留所有权利。
In the present work, based on AlCrN coatings, AlTiSiN and AlCrTiSiN multilayer and nanocomposite coatings were designed and deposited on high-speed steel (HSS) specimens and cutters by cathodic vacuum arc process. The microstructures of these coatings were investigated by grazing incidence X-ray diffraction (GIXRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and high-resolution transmission electron microscope (HRTEM), in association with mechanical property characterisation, and also with a cutting test used to check the service life of coated tools. The results showed that the AlTiSiN coating was composed of nanocrystalline TiN and hcp-AIN. The AlCrTiSiN multilayers and nanocomposite coating contained (111), (200), and (220) planes of TiN and CrN with a face-centred cubic structure (fcc) and nanocrystalline fcc-(Cr,Al)N phases. The AlCrTiSiN coating had a stronger diffraction (200) peak compared with the AlTiSiN coating. Those coatings were superlattice with nanocomposite structures containing nanocrystalline and amorphous phases. The modulation period (7 nm) of the AlCrTiSiN coating was much smaller than the 12 nm of AlTiSiN. A special Cr2N particulate phase existed in the AlCrTiSiN coating. The service life of an AlCrTiSiN coated tool increased by approximately 50% when compared with that with an AlCrN coating because of its excellent mechanical properties (41.14 GPa hardness, 1.07 GPa toughness, 60 N LC2 adhesion strength, 0.2 average friction coefficient, and 36.5 nm (Ra) roughness). (C) 2015 Elsevier B.V. All rights reserved.