Effects of the ratio of hardness to Young’s modulus on the friction and wear behavior of bilayer coatings

Ni, Wangyang; Cheng, Yang‐Tse; Lukitsch, M.J.; Weiner, Anita M.; Lev, Leonid; Grummon, David S.

doi:10.1063/1.1811377

Cited by 169 publications

(57 citation statements)

References 20 publications

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“…Hardness (H) to Young modulus (E) ratio has been proposed as the key factor to measure the behaviour of wear resistance of bilayer coatings. It has been reported that the deformation around the indenter surface exhibit piling-up and sinking-in and the tendency of sinking-in increases with increasing H/E ratio [18]. Fig.…”

Section: Mechanical Propertiesmentioning

confidence: 95%

Effect of crystallographic orientation of nanocrystalline TiN on structural, electrical and mechanical properties of TiN/NiTi thin films

Kumar

Singh

Kumar

et al. 2009

Journal of Alloys and Compounds

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Section: Mechanical Propertiesmentioning

confidence: 95%

Effect of crystallographic orientation of nanocrystalline TiN on structural, electrical and mechanical properties of TiN/NiTi thin films

Kumar

Singh

Kumar

et al. 2009

Journal of Alloys and Compounds

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“…Recent studies suggest that the ratio of hardness to elastic modulus (H/E) may be a more suitable parameter for predicting wear properties compared to evaluating hardness alone [27]. The effect of H/E on wear is based on the knowledge that materials with high H/E values are expected to have small accumulative strain and small accumulative strain energy in sliding, leading to high wear resistance [28]. Therefore, enhancing elasticity (i.e., to reduce E) may be a more suitable approach to improve wear resistance than enhancing the hardness of the material alone.…”

Section: Resultsmentioning

confidence: 98%

Novel visible photoinitiators systems for free-radical/cationic hybrid photopolymerization

2011

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“…The datum of dentin (ζ = 0.264) locates in the region where steel (for GCr15 steel ζ = 0.287 in Figure 6) and Ti alloy (for Ti alloy ζ =0.230 in Figure 6 for enamel [3,4] , the ratios of r H E and ζ similar to steel and metallic glasses in dentin and enamel are very impressive. In fact, the ratio of r H E is related to the deformation properties of a rough surface to govern wear resistance in tribology [12] and the ratio of reversible work to total work ζ is the indication of energy dissipation. So, the relatively same position of enamel and metallic glasses in the diagram of r H E vs ζ (Figure 6) indicates that the enamel presents similar balanced functions in both the resistance against wearing and the energy dissipation as metals, rather than ceramics as people usually supposed.…”

Section: Resultsmentioning

confidence: 99%

Anisotropic, gradient and metal-like mechanical behaviors of teeth and their implications on tooth functions

et al. 2007

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The anisotropy and gradient of the elastic modulus and the hardness of teeth were investigated by means of instrumented indentation method. Such properties are attributed to the unique microstructures of teeth based on scanning electron microscopic analysis. By comparing the relationship between the ratio of hardness to the reduced elastic modulus and the ratio of elastic unloading work to the total work of teeth in course of indentation to those of other materials, we found that the material behaviors of teeth display metal-like characteristics rather than ceramics as considered traditionally. These material behaviors and relevant functions are discussed briefly.tooth, mechanical properties, instrumented indentation, gradient, anisotropic, metal-likeThe most important and impressive function of teeth is life-long mastication [1,2] . This implies that the structural and mechanical properties of the tooth materials can sustain repetitive occlusal loading for tens years. Teeth are highly mineralized tissues with micro-and nanostructural features and the arrangement of these features can significantly affect the mechanical properties [1] . Therefore, to understand the superior microstructures and mechanical properties of teeth are important not only in clinical practice but also in physical and materials sciences.Recently, a lot of mechanical tests on teeth were performed with instrumented indentation or nanoindentation method. Cuy et al. made a nanoindentation mapping of the mechanical properties of human molar tooth enamel and presented that the material behaviors of enamel were not homogeneous [2] . Marshall et al. found that mechanical properties through the normal dentin remained relatively constant and the transition between enamel and dentin was smooth [3,4] . At even smaller scales, the hardness and Young's modulus of single apatite crystal rods in enamel were measured with nanoindentation [5] . More recently, Nizam and Lim indicated that although nanoindentation on teeth is a relatively new area of research, it provides an excellent way to probe and relate the structures and mechanical properties of teeth at the submicron and nanometer scales that were previously not possible but can now greatly benefit dental research. For example, tooth enamel is made up of the hydroxylapatite crystal rods and their orientations will affect the nano-mechanical properties obtained. Thus, anisotropy of teeth remains an interesting area of research [1] . In the present study, by means of nanoindentation method, we examine the elastic modulus, the hardness

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Effects of the ratio of hardness to Young’s modulus on the friction and wear behavior of bilayer coatings

Abstract: Hardness and Young's modulus of high-quality cubic boron nitride films grown by chemical vapor deposition

Cited by 169 publications

References 20 publications

Effect of crystallographic orientation of nanocrystalline TiN on structural, electrical and mechanical properties of TiN/NiTi thin films

Effect of crystallographic orientation of nanocrystalline TiN on structural, electrical and mechanical properties of TiN/NiTi thin films

Novel visible photoinitiators systems for free-radical/cationic hybrid photopolymerization

Anisotropic, gradient and metal-like mechanical behaviors of teeth and their implications on tooth functions

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