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Micro-nano multilayer structure design and solid particle erosion resistance performance of CrAlNx/CrAlN coating

2019; Elsevier BV; Volume: 172; Linguagem: Inglês

10.1016/j.vacuum.2019.109064

1879-2715

Di Wang, Songsheng Lin, Lingyun Liu, Hongzhi Yang, Jing Shi, Bailing Jiang, Kesong Zhou, Xiaofeng Zhang,

Erosion and Abrasive Machining

In this work, the CrAlNx/CrAlN micro-nano multi-layer structure coating was designed and prepared on TC11 titanium alloy by Arc Ion Plating (AIP). In addition, the monolayer CrN and CrAlN coatings was prepared for comparison. The effects of CrN and CrAlN monolayer, CrAlNx/CrAlN multilayer coatings on the micro-structure and phase composition were investigated by Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Transmission Electron Microscope (TEM), and Energy-dispersive X-ray micro-analysis (EDS). The mechanical properties of coatings, including nano-hardness, adhesion strength and fracture toughness were studied by means of nano-indentation, micro-scratch and indentation cracking (CSEM Instruments). It was found that the residual stress of CrN coating was −1.341 GPa, and that of CrAlN coating was −1.569 GPa, while that of CrAlNx/CrAlN multilayer coating was only −0.932 GPa significantly lower than that of CrN and CrAlN coatings. In addition, as the multilayer structure of CrAlNx/CrAlN (x is the atomic percentage, x < 1) is composed of nano-scale lamellar CrAlNx (L), thin columnar structure CrAlNx (C), and micro-nano-scale columnar structure CrAlN, the unique multilayer structure makes the highest fracture toughness (8.7 ± 0.5 MPa m1/2). The minimum erosion rate was achieved for CrAlNx/CrAlN coatings under the condition of 1.265 ± 0.035 μm/g at 90° and 0.568 ± 0.022 μm/g at 30°, respectively. These results indicate that the CrAlNx/CrAlN multilayer coating has the excellent solid particle erosion resistance.