Diamond and Related Materials最新文献_第10页

Synergistic mechanism of HVOF coating and PVD film in tribo-corrosion behaviors of Cr3C2-NiCr/DLC duplex coatings

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-20 DOI: 10.1016/j.diamond.2025.112124

Zihan Feng , Ruirui Liang , Shuang Liang , Dongqing He , Lunlin Shang

The Cr₃C₂-NiCr/DLC duplex coating was successfully prepared on 316 L stainless steel through a combined method of high-velocity oxygen-fuel (HVOF) spraying and physical vapor deposition (PVD). The tribo-corrosion features of Cr₃C₂-NiCr coating, DLC film, and Cr₃C₂-NiCr/DLC duplex coatings in a 3.5 wt% NaCl solution were contrastively investigated. Tribo-corrosion tests were conducted under OCP (Open Circuit Potential) conditions, polarization conditions, and cathodic protection conditions, respectively. It was found that the tribo-corrosion resistance of the Cr₃C₂-NiCr/DLC duplex coatings was mainly associated with the synergistic effect of the top DLC film and the Cr₃C₂-NiCr intermediate layer. The Cr₃C₂-NiCr intermediate layer can provides robust support for the top DLC film, while the DLC film effectively seals the Cr₃C₂-NiCr intermediate layer, collectively enhancing the tribo-corrosion resistance of that duplex coatings. Notably, this duplex coating exhibits superior tribo-corrosion resistance, with a wear rate of 4.89 × 10⁻⁷ mm³/N·m. However, the Cr₃C₂-NiCr coating demonstrates the worst resistance to tribo-corrosion, with a wear rate of 1.83 × 10⁻⁵ mm³/N·m. During the tribo-corrosion process, the material loss of the Cr₃C₂-NiCr coatings is mainly caused by the interaction between corrosion and wear, whereas the material loss of the DLC film and the Cr₃C₂-NiCr/DLC coatings is mainly attributed to mechanical wear. In summary, the excellent property of the Cr₃C₂-NiCr/DLC duplex coatings were proved.

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引用次数: 0

The effect of Ni on the growth of type-IIa diamonds

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-20 DOI: 10.1016/j.diamond.2025.112132

Ziyi Liu , Fuming Deng , Xiaozhou Chen , Jun Ma , Xiaotian Xing , Houzhen Chen , Wenli Deng , Yan Wang , Junzhe Yu , Can Li , Rui Wang , Zhengpeng Li

Diamonds are renowned for their invaluable properties and extensive applications. Among these, Type-IIa diamonds are regarded as the most prized due to their exceptional quality, though their rarity in nature has led to significant interest in their synthetic replication. This study employs the high-pressure and high-temperature method to synthesize high-quality Type-IIa diamond crystals. However, this method is susceptible to the formation of cracks during the growth process due to the rapid growth rate, the differing coefficients of thermal expansion, and the shear force during depressurization. These factors impede the synthesis of high-purity Type-IIa diamonds. To address these challenges and enhance the crystal quality, this paper proposes the incorporation of a specific amount of Ni (flake) into the plugging material. Through the use of a temperature cloud field simulation, it has been demonstrated that Ni has a positive effect on the low stabilization of diamond growth temperature. This assertion has been verified by actual synthesis. Furthermore, a series of physical characterizations have been performed, which have demonstrated that the addition of Ni has a high promotion effect on the synthesis of high-quality type-IIa diamonds.

钻石以其无价的特性和广泛的用途而闻名于世。其中，Type-IIa 型钻石因其卓越的品质而被视为最珍贵的钻石，但由于其在自然界中的稀有性，人们对其合成复制产生了浓厚的兴趣。本研究采用高压高温法合成高质量 IIa 型金刚石晶体。然而，由于生长速度快、热膨胀系数不同以及减压时的剪切力，这种方法在生长过程中容易形成裂缝。这些因素阻碍了高纯度 IIa 型金刚石的合成。为了应对这些挑战并提高晶体质量，本文提出在堵塞材料中加入一定量的镍（片状）。通过使用温度云场模拟，证明了镍对低稳定金刚石生长温度有积极作用。实际合成验证了这一论断。此外，还进行了一系列物理特性分析，结果表明添加镍对合成高质量 IIa 型金刚石有很大的促进作用。

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引用次数: 0

Improvement of morphology and electrical properties of boron-doped diamond films via seeding with HPHT nanodiamonds synthesized from 9-borabicyclononane

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-19 DOI: 10.1016/j.diamond.2025.112127

Stepan Stehlik , Stepan Potocky , Katerina Aubrechtova Dragounova , Petr Belsky , Rostislav Medlin , Andrej Vincze , Evgeny A. Ekimov , Alexander Kromka

Boron-doped diamond (BDD) films are becoming increasingly popular as electrode materials due to their broad potential window and stability in harsh conditions and environments. Therefore, optimizing the crystal quality and minimizing defect density to maximize electronic properties (e.g. conductivity) of BDD is of great importance. This study investigates the influence of different hydrogenated nanodiamond (H-ND) seeding layers on the growth and properties of BDD films. Three types of seeding H-NDs were examined: detonation (H-DND) and top-down high-pressure high-temperature NDs (TD_HPHT H-ND), and boron-doped NDs (H-BND) newly synthesized at high-pressure high-temperature from an organic precursor. Purified and oxidized BND (O-BND) samples yielded clear, blue, and stable colloidal dispersions. Subsequent thermal hydrogenation reversed their zeta potential from – 32 mV to +44 mV and promoted the seeding of negatively charged surfaces. All three H-ND types formed dense seeding layers on SiO₂ and Si/SiO_x substrates, which enabled the growth of BDD films by chemical vapor deposition (CVD). Despite variations in initial surface coverage among the seeding layers (13–25 %), all NDs facilitated the growth of fully closed BDD films approximately 1 μm thick. Significant differences in film morphology and electrical properties were observed. H-BND nucleation yielded the BDD films with the largest crystals (up to 1000 nm) and lowest sheet resistance (400 Ω/sq). This superior performance is attributed to the uniform particle shape and monocrystalline character of H-BND, as corroborated by FTIR, TEM, and SAXS measurements. These findings highlight the critical role of seeding layer properties in determining consequent diamond film evolution and establish H-BNDs as promising seeding material for the growth of high-quality BDD films suitable for electronic and electrochemical applications.

掺硼金刚石（BDD）薄膜因其广阔的潜在窗口以及在恶劣条件和环境下的稳定性，正日益成为一种流行的电极材料。因此，优化晶体质量和降低缺陷密度以最大限度地提高 BDD 的电子特性（如导电性）就显得尤为重要。本研究探讨了不同氢化纳米金刚石 (H-ND) 种子层对 BDD 薄膜生长和特性的影响。研究考察了三种类型的氢化纳米金刚石 (H-ND) 种子层：引爆 (H-DND) 和自上而下的高压高温氢化纳米金刚石 (TD_HPHT H-ND)，以及由有机前驱体在高压高温下新合成的掺硼氢化纳米金刚石 (H-BND)。纯化和氧化的 BND（O-BND）样品产生了透明、蓝色和稳定的胶体分散体。随后的热氢化将它们的 zeta 电位从 - 32 mV 逆转为 +44 mV，并促进了带负电表面的播种。所有这三种 H-ND 类型都在 SiO2 和 Si/SiOx 基底上形成了致密的播种层，从而能够通过化学气相沉积（CVD）技术生长出 BDD 薄膜。尽管播种层的初始表面覆盖率（13-25%）存在差异，但所有 ND 都能促进厚度约为 1 μm 的全封闭 BDD 薄膜的生长。观察到薄膜形态和电性能存在显著差异。H-BND 成核产生的 BDD 薄膜具有最大的晶体（达 1000 nm）和最低的薄层电阻（400 Ω/sq）。这种优异的性能归功于 H-BND 均匀的颗粒形状和单晶特性，傅立叶变换红外光谱、TEM 和 SAXS 测量也证实了这一点。这些发现凸显了播种层特性在决定金刚石薄膜演化过程中的关键作用，并将 H-BND 树立为适合电子和电化学应用的高质量 BDD 薄膜生长的播种材料。

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引用次数: 0

Impact of annealing and nanostructuring on properties of NV centers created by different techniques 退火和纳米结构对通过不同技术制造的 NV 中心特性的影响

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-19 DOI: 10.1016/j.diamond.2025.112126

Miriam Mendoza Delgado , Lucas Tsunaki , Shaul Michaelson , Mohan K. Kuntumalla , Johann P. Reithmaier , Alon Hoffman , Boris Naydenov , Cyril Popov

Nitrogen-vacancy (NV) centers in diamonds have been an epicenter of research for diverse applications in quantum technologies. It is therefore imperative that their fabrication techniques are well understood and characterized for the technological scalability of these applications. A comparative study of the optical and spin properties of NVs created by ion implantation and chemical vapor deposition delta-doping is thus presented, combined with an investigation on the impact of annealing in vacuum at different temperatures. In addition, nanopillars are fabricated by electron beam lithography and reactive ion etching for enhanced photon collection efficiency. An extensive combination of characterization techniques is employed. Notably, the smallest nanopillars present fluorescence enhancements of factor around 50, compared to the unstructured regions. Annealing is also demonstrated to increase the optical contrast between the NVs' electronic states, the coherence and relaxation times both in bulk as in pillars. Regarding the NV preparation technique, the delta-doping is shown to create NVs with less lattice defects and strain compared to implantation.

金刚石中的氮空位（NV）中心一直是量子技术各种应用研究的中心。因此，为了实现这些应用的技术可扩展性，必须充分了解其制造技术并对其进行表征。因此，本文对通过离子注入和化学气相沉积三角掺杂法制备的 NV 的光学和自旋特性进行了比较研究，并对不同温度下真空退火的影响进行了调查。此外，还通过电子束光刻和反应离子蚀刻制造了纳米柱，以提高光子收集效率。此外，还采用了多种表征技术。值得注意的是，与无结构区域相比，最小纳米柱的荧光增强系数约为 50。退火也被证明可以增加 NV 电子态之间的光学对比度、相干性和弛豫时间，无论是在块状还是在柱状中都是如此。在 NV 制备技术方面，与植入法相比，掺掺掺掺三角掺杂法能产生晶格缺陷和应变较少的 NV。

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引用次数: 0

Material removal mechanism of X65 steel by electroplated diamond beads in the low-temperature environment

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-19 DOI: 10.1016/j.diamond.2025.112129

Zihang Guo, Lan Zhang, Jing Wen, Lining Liu, Yuchen Jiang, Ming Liu, Feihong Yun

Diamond wire saws are the preferred underwater cutting tools for the disintegration of X-series steel structures. This paper first analyzes the material removal behavior of abrasive grains during the grinding of X65 steel. Based on contact mechanics theory, a mechanical model is established for the diamond abrasive grain's griding process, encompassing the phases of rubbing, plowing, and cutting to elucidate their interactions. In accordance with the four typical postures of hexoctahedral abrasive grains, a theoretical model for the material removal rate (MRR) of the electroplated diamond bead is proposed, based on the shoelace theorem and the trajectory of the abrasive grains. Finally, low-temperature grinding experiments were conducted to reveal the chip formation mechanism of X65 steel under different cutting parameters and verify the MRR model. Observations under a scanning electron microscope (SEM) showed that the griding chips changed from the flowing chip to the knife chip as the feed speed increased. With an increase in cutting speed, the proportion of lump debris also increased. The error rate between the theoretical model of MRR and the experimental data is within 10 %, indicating the model's capability to predict the removal rate of the beads and wire saw.

金刚石绳锯是分解 X 系列钢结构的首选水下切割工具。本文首先分析了 X65 钢磨削过程中磨粒的材料去除行为。以接触力学理论为基础，建立了金刚石磨粒磨削过程的力学模型，包括摩擦、犁耕和切割三个阶段，阐明了它们之间的相互作用。根据六八面体磨粒的四种典型姿态，基于鞋带定理和磨粒轨迹，提出了电镀金刚石珠的材料去除率（MRR）理论模型。最后，通过低温磨削实验揭示了 X65 钢在不同切削参数下的切屑形成机理，并验证了 MRR 模型。在扫描电子显微镜（SEM）下的观察结果表明，随着进给速度的增加，磨削切屑由流动切屑变为刀状切屑。随着切削速度的增加，块状碎屑的比例也在增加。MRR 理论模型与实验数据之间的误差率在 10% 以内，表明该模型能够预测钢珠和线锯的去除率。

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引用次数: 0

Thermally activated conductance of three different CVD grown free-standing polycrystalline diamond sheets

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-19 DOI: 10.1016/j.diamond.2025.112128

Yimeng Zhao , Shirun Huang , Mingyu Yin , Jiawei Li , Shuqian Rui , Jiesen Zhang , Hongwei Zhu , Qiao Chen

The applications of diamond in temperature sensing are gaining attention, while the influence of various growth processes on thermal sensitivity remains unclear. In this study, thermistors were fabricated based on free-standing polycrystalline diamond (PD) sheets synthesized through three different techniques: hot filament chemical vapor deposition (HFCVD), microwave plasma chemical vapor deposition (MPCVD), and direct current arc plasma jet chemical vapor deposition (DCCVD). The results indicate that the diamond produced with a high density of grain boundaries, defects, and a (110) texture, exhibits optimal thermal sensitivity. The thermistor based on HFCVD-diamond shows an extremely high thermal constant (B_25/300: 8133 K), while thermistors made from diamonds synthesized by MPCVD and DCCVD show negligible thermally activated conductivity at room temperature. Analysis of the impedance spectrum reveals grain boundaries play a crucial role in the thermal sensitization mechanism of PD sheet grown by HFCVD, whereas in samples synthesized by MPCVD and DCCVD, the grains themselves are more influential.

金刚石在温度传感方面的应用越来越受到关注，但各种生长过程对热敏性的影响仍不清楚。在这项研究中，利用热丝化学气相沉积（HFCVD）、微波等离子体化学气相沉积（MPCVD）和直流电弧等离子体喷射化学气相沉积（DCCVD）三种不同技术合成的独立多晶金刚石（PD）片制造了热敏电阻。结果表明，生产出的金刚石具有高密度的晶界、缺陷和 (110) 纹理，具有最佳的热灵敏度。基于 HFCVD 金刚石的热敏电阻显示出极高的热常数（B25/300：8133 K），而由 MPCVD 和 DCCVD 合成的金刚石制成的热敏电阻在室温下的热激活电导率几乎可以忽略不计。阻抗谱分析显示，晶界在 HFCVD 生长的 PD 片的热敏机制中起着关键作用，而在 MPCVD 和 DCCVD 合成的样品中，晶粒本身的影响更大。

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引用次数: 0

An investigation on chlorine evolution reaction behavior of graphene containing RuO2-TiO2 coating using advanced dynamic impedance method

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-18 DOI: 10.1016/j.diamond.2025.112125

K. Jafarzadeh, S. Taei, S.M. Mirali, Y. Mosaei Oskoei

Graphene was added to a standard RuO₂-TiO₂ coating to increase the electrocatalytic capacity and facilitate the easier evolution of chlorine gas. The efficiency of chlorine gas evolution from these anodes was studied and their electrochemical behavior was analyzed using various methods including electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and dynamic electrochemical impedance spectroscopy (DEIS). The surface morphology of the samples was observed using scanning electron microscopy (SEM). The results showed that adding up to 1 g/L of graphene reduced charge transfer resistance and increased chlorine gas evolution. It was found that wetting of the anode surface played a role in the evolution of chlorine gas. Despite the improved electrocatalytic activity, the hydrophobic nature of graphene made it difficult for bubbles to form on the surface of the anode, resulting in larger bubbles that caused damage to the surface.

引用次数: 0

Structural elucidation and environmental remediation potential of novel NiCoP@rGO nanocatalyst

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-18 DOI: 10.1016/j.diamond.2025.112123

P. Rajeswaran , G. Raja , M. Raja , A. Gilbert Sunderraj , K. Umavathy

A simple hydrothermal method was used to hybridise reduced graphene oxide (rGO) with nickel cobalt phosphide (NiCoP) to produce an incredibly porous nanocomposite material. X-Ray Diffraction (XRD), Raman, Scanning Electron Microscopy (FE-SEM), High Resolution Transmission Electron Microscopy (HRTEM), UV-VIS, and XPS were utilised to investigate the crystal structure, functional groups, chemical bands, morphology, surface area and oxidation state of the synthesised NiCoP@rGO nanocomposite. According to the investigations, the NiCoP nanoparticles were adhered to the rGO surface. Additionally, the synthesised photocatalyst was used to degrading orange G (OG) and Eosin Yellow (EY) utilising UV light radiation. Ultimately, a number of operating conditions were optimised, including the effects of pH, catalyst dosage, concentration and electrolytes. The findings demonstrated that NiCoP@rGO exceeded pristine NiCoP in terms of photocatalytic efficiency. Reusability studies showed that it retained its initial efficiency even after the third cycle of reuse. Z-scheme is part of the photocatalytic mechanism that efficiently separates photogenerated electron-hole pairs in the presence of UV light. According to these findings, the synthesised NiCoP@rGO would be very beneficial for the degradation of organic industries.

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引用次数: 0

ZnCo2O4/graphene@NF nanocomposites as high-capacity anode materials for lithium-ion batteries

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-17 DOI: 10.1016/j.diamond.2025.112121

Jia Du , Qi Liu , Hengrui Qiu , Yongqiang Zhang , Wenxiu He

In this paper, a three-dimensional composite of ZnCo₂O₄/graphene@nickel foam (ZCO/G@NF) was prepared for lithium-ion battery anode. It eliminates the tedious steps of traditional coating and maintains a stable structure during charging and discharging, which is not easy to collapse. The binder-free electrode prevents agglomeration of nanosheets and accelerates the transfer efficiency of electrons and ions. As a lithium anode showing excellent cycling and multiplication performance, the discharge capacity can still reach 1128 mAh/g after 100 cycles at a current density of 0.1 A/g, and when the current reaches 1.4 A/g, it can still maintain a reversible capacity of 760mAh/g. The material has high reversible capacity, good cycling stability, and good multiplicity performance. Combining the advantages of self-supported structure, carbon composite, and nanomorphology design, the electrochemical performance of ZnCo₂O₄ is comprehensively improved.

引用次数: 0

High-performance diamond “Supertools” with extreme tool-life

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-02-17 DOI: 10.1016/j.diamond.2025.112122

I.S. Durazo-Cardenas , Saurav Goel , P. Shore , L. Kirkwood , Graham L.W. Cross

The use of diamond as a cutting tool is pervasive in modern ultra-high-precision machining applications, particularly for generating sub-micron accurate features through the Single Point Diamond Machining (SPDM) method. Beyond SPDM, diamond is also widely employed in contact profilometry (imaging), nanoindentation, nanoimpact, nanoscratching, and lithography applications.

Interestingly, a particular type of diamond, commonly used in what the fabrication industry calls “supertools,” consistently demonstrates a lifespan up to 300% longer than that of standard diamond tools. Despite this remarkable performance, the reasons behind the enhanced durability of these unique diamond tools have remained unclear.

This paper provides the first experimental explanation for the exceptional properties of these “supertools”. Using Fourier Transform Infrared Spectroscopy (FTIR), we establish that such diamond possess higher overall concentration of nitrogen, particularly Defect Type A (type IaA) and Defect Type C (type Ib). Counterintuitively, they also exhibit lower residual stresses, as revealed through cross-polar examination. Moreover, the diamond tip misalignment error, estimated using Laue backscattering analysis, was found to be insignificant in governing the tool wear resistance. These findings suggest that the wear resistance of natural diamonds can be predicted by screening for high levels of nitrogen defects (combination of Type A and Type C). This insight offers valuable potential for selecting superior diamonds for high-value manufacturing.

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引用次数: 0