Synthesis, Characterization, and Applications of Diamond Films

Chandran, Maneesh

doi:10.1016/b978-0-12-813248-7.00006-7

Cited by 10 publications

(5 citation statements)

References 130 publications

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“…45 This method of material testing can be used to test the coefficient of friction between materials, material wear testing and other tribological characteristics. 44,46 A pin-on-disc consists of a flat, pin or ball that rests and slides on a flat disc. The pin and plate are made of a material for which tribological characteristics are examined.…”

Section: Applied Methodologies For Brake Wear Testingmentioning

confidence: 99%

The analysis of the influential parameters that cause particles formation during the braking process: A review

Vasiljević

Glišović

Stojаnović

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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The braking system is one of the important systems from the aspect of vehicle safety, but it is also one of the systems that has a significant impact on the environment. Brakes are considered to be a source of non-exhaust particles, that is sources that create particles by the wear of the elements that are in contact with each other, and in this case, the brake friction elements (brake pads and rotating disc). Such particles often contain heavy metals that are part of the friction elements. There are a number of influencing factors that can affect the wear of the friction elements and increase the concentration of the formed particles. Laboratory methods of testing wear and particle formation, road tests and various simulations of brake wear are most often used for testing. In this paper, a review of methodologies for testing the formation of particles from the braking system, the materials used in the composition of the friction elements of the brake, as well as factors affecting the wear rate and concentration of particles of different sizes, based on the conclusions of other authors is presented. Based on this review, it can be concluded which quantities and factors need special attention during further research in the mechanism of formation of non-exhaust particles whose source is the vehicle braking system.

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Section: Applied Methodologies For Brake Wear Testingmentioning

confidence: 99%

The analysis of the influential parameters that cause particles formation during the braking process: A review

Vasiljević

Glišović

Stojаnović

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Pacella et al [ 11 ] investigated the effects of feed speed on the microstructure of two PCD composites with medium and fine grain sizes using a Yb:fibre laser. A speed of 70 mm/s showed a greater metastable conversion of graphite.…”

Section: Fabrication Of Surface Texturesmentioning

confidence: 99%

“…For diamond formation to occur, temperatures and pressures need to exceed 1583 K and 5.2 GPa, respectively [ 10 ], which is why they form in the upper mantle, approximately 100–150 km below the Earth’s surface. Natural diamonds have a near-perfect edge roughness ideal for precision cutting; however, the natural microstructure of a single crystal can exhibit weak planes [ 11 ]. These planes arise because the tetrahedral and cubic structures have regions of fewer bonds, making the hardness directionally dependent.…”

Section: Introductionmentioning

confidence: 99%

Laser Processing of Hard and Ultra-Hard Materials for Micro-Machining and Surface Engineering Applications

2021

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Polycrystalline diamonds, polycrystalline cubic boron nitrides and tungsten carbides are considered difficult to process due to their superior mechanical (hardness, toughness) and wear properties. This paper aims to review the recent progress in the use of lasers to texture hard and ultra-hard materials to a high and reproducible quality. The effect of wavelength, beam type, pulse duration, fluence, and scanning speed is extensively reviewed, and the resulting laser mechanisms, induced damage, surface integrity, and existing challenges discussed. The cutting performance of different textures in real applications is examined, and the key influence of texture size, texture geometry, area ratio, area density, orientation, and solid lubricants is highlighted. Pulsed laser ablation (PLA) is an established method for surface texturing. Defects include melt debris, unwanted allotropic phase transitions, recast layer, porosity, and cracking, leading to non-uniform mechanical properties and surface roughness in fabricated textures. An evaluation of the main laser parameters indicates that shorter pulse durations (ns—fs), fluences greater than the ablation threshold, and optimised multi-pass scanning speeds can deliver sufficient energy to create textures to the required depth and profile with minimal defects. Surface texturing improves the tribological performance of cutting tools in dry conditions, reducing coefficient of friction (COF), cutting forces, wear, machining temperature, and adhesion. It is evident that cutting conditions (feed speed, workpiece material) have a primary role in the performance of textured tools. The identified gaps in laser surface texturing and texture performance are detailed to provide future trends and research directions in the field.

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“…The most intuitive notion of polymorphism is when a single composition can form different crystal structures of entirely different symmetry and periodicity. The archetypal example of this is bulk elemental carbon, which can take the form of graphite (space group P 6 3 /mmc , lattice constants a = 2.46 Å and c = 6.71 Å) and diamond (space group Fd m, a = 3.56 Å) among others . The various structures of carbon are also referred to as “allotropes,” a term used to describe polymorphs of elemental materials .…”

Section: Introductionmentioning

confidence: 99%

“…The archetypal example of this is bulk elemental carbon, which can take the form of graphite (space group P6 3 /mmc, lattice constants a = 2.46 Å and c = 6.71 Å) and diamond (space group Fd3m, a = 3.56 Å) among others. 6 The various structures of carbon are also referred to as "allotropes," a term used to describe polymorphs of elemental materials. 1 More subtle forms of polymorphism also exist such as polytypism.…”

mentioning

confidence: 99%

Polymorphism in Post-Dichalcogenide Two-Dimensional Materials

2021

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Two-dimensional (2D) materials exhibit a wide range of atomic structures, compositions, and associated versatility of properties. Furthermore, for a given composition, a variety of different crystal structures (i.e., polymorphs) can be observed. Polymorphism in 2D materials presents a fertile landscape for designing novel architectures and imparting new functionalities. The objective of this Review is to identify the polymorphs of emerging 2D materials, describe their polymorph-dependent properties, and outline methods used for polymorph control. Since traditional 2D materials (e.g., graphene, hexagonal boron nitride, and transition metal dichalcogenides) have already been studied extensively, the focus here is on polymorphism in post-dichalcogenide 2D materials including group III, IV, and V elemental 2D materials, layered group III, IV, and V metal chalcogenides, and 2D transition metal halides. In addition to providing a comprehensive survey of recent experimental and theoretical literature, this Review identifies the most promising opportunities for future research including how 2D polymorph engineering can provide a pathway to materials by design.

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Synthesis, Characterization, and Applications of Diamond Films

Cited by 10 publications

References 130 publications

The analysis of the influential parameters that cause particles formation during the braking process: A review

The analysis of the influential parameters that cause particles formation during the braking process: A review

Laser Processing of Hard and Ultra-Hard Materials for Micro-Machining and Surface Engineering Applications

Polymorphism in Post-Dichalcogenide Two-Dimensional Materials

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