Super-hard (MoSiTiVZr)Nx high-entropy nitride coatings

Li, Jingchuan; Chen, Yujie; Zhao, Yiping; Shi, Xunwang; wang, Shu; Zhang, Sam

doi:10.1016/j.jallcom.2022.166807

Cited by 35 publications

(7 citation statements)

References 68 publications

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“…The GIXRD patterns of (AlCrTiZrMox)N coatings prepared with different Mo target powers are shown in Figure 2. The diffraction peaks at 36.0°, 42.2°, 60.9°, and 73.1°correspond to (111), (200), (220), and (311) crystal planes, respectively, which matches with the face-centered cubic (FCC) phase structure (B1-NaCl type), consistent with previous studies [18,26]. The coating with 0 at.% Mo shows a (200) preferred orientation, and with the addition of Mo, the preferred orientation of the coatings changes to a (111) crystal plane.…”

Section: Microstructuressupporting

confidence: 90%

Study on Microstructure and Tribological Mechanism of Mo Incorporated (AlCrTiZr)N High-Entropy Ceramics Coatings Prepared by Magnetron Sputtering

Zheng,

Zhao,

et al. 2024

Nanomaterials

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(AlCrTiZrMox)N coatings with varying Mo content were successfully prepared using a multi-target co-deposition magnetron sputtering system. The results reveal that the Mo content significantly affects the microstructure, hardness, fracture toughness, and tribological behavior of the coatings. As the Mo content in the coatings increases gradually, the preferred orientation changes from (200) to (111). The coatings consistently exhibit a distinct columnar structure. Additionally, the hardness of the coatings increases from 24.39 to 30.24 GPa, along with an increase in fracture toughness. The friction coefficient is reduced from 0.72 to 0.26, and the wear rate is reduced by 10 times. During the friction process, the inter-column regions of the coatings are initially damaged, causing the wear track to exhibit a wavy pattern. Greater frictional heat is generated at the crest of the wave, resulting in the formation of a MoO2 lubricating layer. The friction reaction helps to reduce the shear force during friction, demonstrating the lower friction coefficient of the (AlCrTiZrMox)N coatings. Both the hardness and fracture toughness work together to reduce the wear rate, and the (AlCrTiZrMox)N coatings show excellent wear resistance. Most notably, although the columnar structure plays a negative role in the hardness, it contributes greatly to the wear resistance.

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Section: Microstructuressupporting

confidence: 90%

Study on Microstructure and Tribological Mechanism of Mo Incorporated (AlCrTiZr)N High-Entropy Ceramics Coatings Prepared by Magnetron Sputtering

Zheng,

Zhao,

et al. 2024

Nanomaterials

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“…On the other hand, nitrides of these HEAs have recently been developed and their superior hardness and high-temperature stability have been demonstrated, making them suitable for harsh environmental applications. Recently, Li et al [118] investigated the effect of nitrogen content on the mechanical and tribological properties of (MoSiTiVZr)Nx, using a confocal magnetron sputtering technique with varying N2 flow rates. Remarkably, a superhardness of 45.6 GPa, an elastic modulus 408 GPa, and low friction (~0.3) (Figure 11b) were attained for the N concentration of approximately 53.7 at%.…”

Section: High Entropy Alloy-based Nitride Coatingsmentioning

confidence: 99%

State-of-the-Art Developments in Advanced Hard Ceramic Coatings Using PVD Techniques for High-Temperature Tribological Applications

2023

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Hard and wear-resistant coatings created utilizing physical vapor deposition (PVD) techniques are extensively used in extreme tribological applications. The friction and wear behavior of coatings vary significantly with temperature, indicating that advanced coating concepts are essential for prolonged load-bearing applications. Many coating concepts have recently been explored in this area, including multicomponent, multilayer, gradient coatings; high entropy alloy (HEA) nitride; and functionally modified coatings. In this review, we highlighted the most significant findings from ongoing research to comprehend crucial coating properties and design aspects. To obtain enhanced tribological properties, the microstructure, composition, residual stress, hardness, and HT oxidation resistance are tuned through doping or addition of appropriate materials at an optimized level into the primary coatings. Such improvements are achieved by optimizing PVD process parameters such as input power, partial pressure, reactive gas flow rates, substrate bias, and temperature. The incorporation of ideal amounts of Si, Cr, Mo, W, Ag, and Cu into ternary and quaternary coatings, as well as unique multilayer designs, considerably increases the tribological performance of the coatings. Recent discoveries show that not only mechanical hardness and fracture toughness govern wear resistance, but also that oxidation at HT plays a significant role in the lubrication or wear failure of coatings. The tribo-induced metal oxides and/or Magnéli phases concentrated in the tribolayer are the key governing factors of friction and wear behavior at high temperatures. This review includes detailed insights into the advancements in wear resistance as well as various failure mechanisms associated with temperature changes.

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“…The nitrogen ratio (RN) is presented as the measured nitrogen flow in standard cubic centimeters per minute (sccm) or as a percentage of the total gas inflow. Various studies, including those on (AlCrTiZrV)N [80], (AlCoCrNi)N [81], (MoSiTiVZr)N [82], (CrAlTiNbV)N [83], (AlCrTiVZr)N [84], (AlCrTaTiZr)N [85], (TiVCrAlZr)N [86], (CrNbTiAlV)N [87],…”

Section: Nitrogen Ratiomentioning

confidence: 99%

“…At an RN of 0% (ie. metallic), most coatings have an amorphous structure due to the high mixing entropy increasing the solid solubility along with the lattice distortion and sluggish diffusion [80,82]. As the nitrogen ratio increases to the range of 5-20% there is a transition to an FCC structure.…”

Section: Nitrogen Ratiomentioning

confidence: 99%

“…Further increase in RN will reduce the atom energy due to the reduction in mean free path during transport across the deposition chamber. As the (111) orientation has the lowest strain energy and is the closest packed, it will often be preferred in these conditions [82,84]. A sample XRD pattern of (MoSiTiVZr)N demonstrates a transition from amorphous to FCC (Figure 2-17).…”

Section: Nitrogen Ratiomentioning

confidence: 99%

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Characterization and Performance Evaluation of High Entropy Nitride Coatings Produced by Cathodic Arc Evaporation

Lothrop

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Protective coatings are a widely used technique to improve surface properties. Recent developments in alloy design have identified many unique properties of high entropy alloys which have been incorporated into nitride coatings to produce high entropy nitrides. The research conducted for this thesis investigated the use of high entropy nitrides (AlCrTiVZr)N, (AlCrTiMoV)N and (AlCrTiMoVNi)N with varying Ni concentration for protective coatings produced by cathodic arc evaporation. All coatings were evaluated for their composition, microstructure, and surface morphology. The coatings thermal stability, mechanical properties of hardness and Young's modulus were evaluated along with the coatings resistance to wear and erosion. The coatings produced in this study showed promise as protective coatings, however future efforts will be dedicated to reducing the droplet formation during deposition to further improve performance.

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Super-hard (MoSiTiVZr)Nx high-entropy nitride coatings

Cited by 35 publications

References 68 publications

Study on Microstructure and Tribological Mechanism of Mo Incorporated (AlCrTiZr)N High-Entropy Ceramics Coatings Prepared by Magnetron Sputtering

Study on Microstructure and Tribological Mechanism of Mo Incorporated (AlCrTiZr)N High-Entropy Ceramics Coatings Prepared by Magnetron Sputtering

State-of-the-Art Developments in Advanced Hard Ceramic Coatings Using PVD Techniques for High-Temperature Tribological Applications

Characterization and Performance Evaluation of High Entropy Nitride Coatings Produced by Cathodic Arc Evaporation

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