Fabrication of Nanodiamond Coating on Steel

Velázquez, Rafael; Neto, Victor; Uppireddi, Kishore; Weiner, Brad R.; Morell, Gerardo

doi:10.3390/coatings3040243

Cited by 10 publications

(3 citation statements)

References 44 publications

(51 reference statements)

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“…However, there are many different aspects in the micro-Raman spectra of the single crystal diamond and nanocrystalline diamond films [25]. NCD films can be synthesized by means of CVD method on various types of substrates [26] [27]. In this paper, some practical details in the laser Raman spectra of CVD NCD thin films has been shown.…”

Section: Introductionmentioning

confidence: 99%

Laser Micro-Raman Spectroscopy of CVD Nanocrystalline Diamond Thin Film

Motahari

Malekfar

2019

IJOP

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Laser micro-Raman spectroscopy is an ideal tool for assessment and characterization of various types of carbonbased materials. Due to its special optical properties (CrN) coated stainless steel substrates. NCD films have been investigated by laser micro-Raman spectroscopy. The fingerprint of diamond based materials is in the spectral region of 1000-1600 cm -1 in the first order of Raman scattering spectrum. By using of Gaussian peak fitting, characteristic peaks in the micro-Raman spectrum of NCD films including diamond peak (D), NCD features, a vibrational density of states (VDOS) in the ultra-nanocrystalline diamond (UNCD) clusters, graphitic (G) band and disordered (D) band can be assigned. These peaks and bands can be broadened, shifted in the spectral region or may be eliminated from the spectra due to NCD films grain sizes, synthesis conditions and other surface effects on the crystals. The increasing grain sizes to about 100 nm and faceted grains as the most important parameters can promote the diamond Raman signal, eliminate the VDOS, UNCD and even NCD features in the Raman spectrum.

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Section: Introductionmentioning

confidence: 99%

Laser Micro-Raman Spectroscopy of CVD Nanocrystalline Diamond Thin Film

Motahari

Malekfar

2019

IJOP

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“…[2][3][4] The advantages open an important application in the fabrication of novel ND-based composites with more outstanding properties by coating and doping techniques. [5][6][7][8][9][10][11][12][13][14][15][16] Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) is a widely used high energy explosive. It has occupied a key position in the main charge explosive of warheads and the energetic component of composite propellants.…”

Section: Introductionmentioning

confidence: 99%

The effect of a detonation nanodiamond coating on the thermal decomposition properties of RDX explosives

Tong

Zhang

2014

Phys. Chem. Chem. Phys.

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A well-dispersed and uniformly shaped detonation nanodiamond (DND) was produced and coated over micron scale RDX in various amounts to form four kinds of DND coating composites (NDRs). In order to confirm the optimal coating amount and its effect on the thermal properties, the thermal decomposition and kinetics were studied by DSC, TG and DPTA techniques. The critical temperature of thermal explosion (Tb) and the self accelerating decomposition temperature (T(SADT)) both exhibit an interesting volcano-shaped changing trend and rank in an increasing order of NDR4 < NDR1 < RDX < NDR3 < NDR2. This indicates that the DND coating amount, ranging from 1/7 to 1/5, provides NDRs with better thermal safety than RDX. The thermolytic kinetic parameters (Ea and A) and activation thermodynamic parameters (ΔS(≠), ΔH(≠) and ΔG(≠)) are sorted in the following order: NDR1 < NDR4 < NDR2 < NDR3. The gas emission and reaction rate constant of the initial thermal decomposition have the same order. The results show that the DND coating could improve the reactivity of the NDRs and the effect is proportional to the coating amount. However, excessive coating that is more than 1/3 conversely hinders decomposition and gas diffusion, like a layer of protective shell. The isoconversional activation energy (Ea) varies with the conversion extent (α) at the initial stage of α = 0.1-0.5, which indicates that the thermal decomposition of the NDRs is a multi-step process including the secondary reaction or catalytic reaction. However, the Ea values are almost independent of α when α = 0.6-0.9, with the mean values in an increasing order of NDR1 < NDR4 < NDR2 < NDR3.

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“…Some multilayer solutions could mitigate this high thermal stress correctly. We recommend the review by Neto et al [30] that addressed this problem and showed a comparative table of the main intermediate layers shown in the literature, qualifying their diamond quality and adhesion.…”

Section: Introductionmentioning

confidence: 99%

Interlayers Applied to CVD Diamond Deposition on Steel Substrate: A Review

et al. 2017

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Academics and industry have sought after combining the exceptional properties of diamonds with the toughness of steel. Since the early 1990s several partial solutions have been found but chemical vapor deposition (CVD) diamond deposition on steel substrate continues to be a persistent problem. The main drawbacks are the high carbon diffusion from gas phase into substrate, the transition metals on the material surface that catalyze sp 2 bond formation, instead of sp 3 bonds, and the high thermal expansion coefficient (TEC) mismatch between diamond and steels. An intermediate layer has been found necessary to increase diamond adhesion. Literature has proposed many efficient intermediate layers as a diffusion barrier for both, carbon and iron, but most intermediate layers shown have not solved TEC mismatch. In this review, we briefly discuss the solutions that exclusively work as diffusion barrier and discuss in a broader way the ones that also solve, or may potentially solve, the TEC mismatch problem. We examine some multilayers, the iron borides, the chromium carbides, and vanadium carbides. We go through the most relevant results of the last two and a half decades, including recent advances in our group. Vanadium carbide looks promising since it has shown excellent diffusion barrier properties, its TEC is intermediary between diamond and steel and, it has been thickened to manage thermal stress relief. We also review a new deposition technique to set up intermediate layers: laser cladding. It is promising because of its versatility in mixing different materials and fusing and/or sintering them on a steel surface. We conclude by remarking on new perspectives.

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Fabrication of Nanodiamond Coating on Steel

Cited by 10 publications

References 44 publications

Laser Micro-Raman Spectroscopy of CVD Nanocrystalline Diamond Thin Film

Laser Micro-Raman Spectroscopy of CVD Nanocrystalline Diamond Thin Film

The effect of a detonation nanodiamond coating on the thermal decomposition properties of RDX explosives

Interlayers Applied to CVD Diamond Deposition on Steel Substrate: A Review

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