Mechanical performance upgrading of CVD diamond using the multilayer strategy

Salgueiredo, E.; Amaral, M.; Almeida, F.A.; Fernandes, A.J.S.; Oliveira, F.J.; Silva, Rui

doi:10.1016/j.surfcoat.2013.10.017

Cited by 37 publications

(11 citation statements)

References 38 publications

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“…The microcrystalline diamond (MCD) coatings exhibit higher hardness and better adhesion characteristics than that of nanocrystalline diamond (NCD) coatings [8], while the NCD coatings present a lower friction coefficient with a smoother surface. The composite coatings of MCD and NCD exhibit more advantages with the superiority of two coatings simultaneously [9][10][11]. In the case of cutting composite materials, diamond coatings have a positive effect, due to their excellent mechanical and physical properties.…”

Section: Introductionmentioning

confidence: 99%

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

2018

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The drilling of carbon fiber reinforced plastics (CFRP) is a significant topic for the aircraft industry. However, CFRP are materials which are difficult to cut due to their unique properties. This paper studies tools with excellent cutting performance in machining CFRP. The microcrystalline diamond (MCD), nanocrystalline diamond (NCD), and dual-layer composite MCD/NCD coatings are deposited on Co-cemented tungsten carbide (WC-Co) drills. The morphology of MCD shows pyramidal grains and the NCD and MCD/NCD coatings present cauliflower-like morphology. The cutting performances of coated tools are checked in CFRP drilling tests by the drilling force and tool wear. According to the results, the dual-layer composite MCD/NCD coated tools present the best cutting performance with the lowest drilling force. Meanwhile, the MCD/NCD coated tools display high resistance to wear and adhesive strength.

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Section: Introductionmentioning

confidence: 99%

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

2018

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“…The rate of deposition of carbon atoms in evolving certain sized grains or crystallites become uniform at the later stage of the process and their faces start formulating smooth and faceted surface as long as operating under the fixed localized process parameters. A detailed investigation of transformation of tiny grains clusters to grains of cubic morphology in multilayer strategies are discussed elsewhere [39,49]. An abraded/seeded surface compensates the surface energy of depositing species either through trapping or rebound in cavities/pits, thus, adjusting the surface energy in terms of thermal expansion coefficient of two different materials at interface.…”

mentioning

confidence: 99%

Switching dynamics of morphology-structure in chemically deposited carbon films – A new insight

Ali

Ürgen

2017

Carbon

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Carbon is one of the most investigated materials and shows chaotic behavior in terms of evolving structure. Synthesizing carbon materials largely depend on the deposition technique, process parameters, condition of substrate surface and ratio of the gaseous chemistry. A variety of techniques have been employed to depositing carbon films from various gaseous mixtures to different substrate materials.In this study, carbon thin and thick films are discussed for different techniques known as hot filament chemical vapor deposition and microwave plasma chemical vapor deposition where their synthesis process has been explained in a new context. Here, we discuss attained dynamics of atoms (or their tiny grains) amalgamating into a particular phase of grain or crystallite and electron-dynamics responsible for binding atoms in the formation of all sorts of tiny grains, grains and crystallites controlling overall morphology-structure of films thickness at few nanometers to several microns. Carbon atoms when in solid state, on amalgamation at flat surface result into bind under uniform electron-dynamics and when the amalgamation is at uneven surface, (even at atomic level) they result into bind under non-uniform electron-dynamics. Where binding of atoms is at uniform electron-dynamics, a graphitic structure evolves following by different modifications into other carbon phases depending on the orientation of electron Modified Final Version 2 states with respect to centre of inner part of atom known as nucleus. Substrates under appropriate surface defects or abrasion result into an improved rate of nucleation of tiny grains, hence, their increased rate of growth. This study embarks on unexplored science of carbon films where in addition to localized process parameters nature of substrate also influence dynamics of formation of tiny clusters, grains and crystallites at their initial stage of formation. Our results and discussions enlighten us to revisit the nucleation and growth mechanisms of different sorts of films deposit at any scale and at any substrate surface constituting different composition.

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“…Mitterer et al [ 23 ] presented and discussed results obtained on hard coatings applied to die-casting dies using sputtering and plasma-assisted chemical vapour deposition (PACVD) as well as its application in aluminium die casting. Currently, coatings for extrusion dies created using chemical vapour deposition (CVD) are often multi-layer systems, which combine the advantages of TiC, TiN, and TiCN single-layer coating, with advantages of high hardness, low coefficient of friction (COF), corrosion resistance, and good thermal stability [ 24 , 25 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Friction and Wear Performance of Hot Extrusion Die Materials

et al. 2022

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For the aluminium alloys produced by the hot extrusion process, the profile is shaped according to the bearing at the exit of the extrusion die. The tribological process has significant effects on the die service life, profile dimensional tolerances, and profile surface finish. Recently, new technologies have been introduced to the hot extrusion die, such as cemented carbide insert die and surface coating. However, under hot extrusion working conditions, quantitative studies on their friction and wear performances are lacking. In this work, the friction and wear performances of three typical extrusion die materials, traditional hot tool steel (H13), cemented carbide (YG8), and chemical vapour deposition (CVD) coating, were studied. Macro and nano hardness tests, Pin-on-disk friction and wear tests, optical profiler and SEM observations, and experiments and simulations of hot extrusion were conducted. The results show that the coefficients of friction of CVD coatings and H13 hot work tool steel specimens were smaller under the hot extrusion condition than at room temperature. The wear mechanisms of H13, YG8, and CVD coatings at 500 °C are adhesion, abrasive, and fatigue, respectively. Moreover, the tribology results were validated by the extrusion experiments and the finite element analysis of hot extrusion. The conclusion of this manuscript is useful not only for the numerical simulation of the hot extrusion process but also for the surface finishing of the extrusion profile.

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Mechanical performance upgrading of CVD diamond using the multilayer strategy

Cited by 37 publications

References 38 publications

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

Switching dynamics of morphology-structure in chemically deposited carbon films – A new insight

Experimental and Numerical Study on Friction and Wear Performance of Hot Extrusion Die Materials

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