Boron carbide coating to improve the chemical stability of nm-thick graphite films

Kim, Taesung; Yeo, Jin-Ho; Nam, Ki-Bong; Kim, Mun Ja; Yoo, Jinsu

doi:10.1016/j.tsf.2020.138002

Cited by 10 publications

(5 citation statements)

References 18 publications

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“…As seen from Figure 3, the atomic ratio of boron to carbon is lower than the stoichiometry of B 4 C, which is consistent with the results of other investigations [49][50][51]. It should be noted that most authors of works where boron carbide films were deposited using a B 4 C target do not provide the data on the total elemental composition of these films or the ratio of B/C atoms, and do not mention the content of oxygen and nitrogen [48,52,53]. Table 3 presents water or oxygen adsorbed in the reaction chamber during the deposition process and may be due to the film surface contamination after deposition during storage of the samples.…”

Section: Film Structure Composition and Bonding Typessupporting

confidence: 89%

“…It is known that BCx films obtained by magnetron sputtering have an amorphous structure when synthesized up to 900 °C. [48].…”

Section: Film Structure Composition and Bonding Typesmentioning

confidence: 99%

“…The XRD patterns of all the films did not contain any reflexes (Figure S1). It is known that BC x films obtained by magnetron sputtering have an amorphous structure when synthesized up to 900 • C. [48].…”

Section: Film Structure Composition and Bonding Typesmentioning

confidence: 99%

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Room-Temperature Formation of Hard BCx Films by Low Power Magnetron Sputtering

2021

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Boron carbide is one of the most important non-metallic materials. Amorphous BCx films were synthesized at room temperature by single- and dual-target magnetron sputtering processes. A B4C target and C target were operated using an RF signal and a DC signal, respectively. The effect of using single- and dual-target deposition and process parameters on the chemical bonding and composition of the films as well as their functional properties were characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray energy dispersive analysis, X-ray diffraction, ellipsometry, and spectrophotometry. It was found that the film properties depend on the sputtering power and the used targets. EDX data show that the composition of the samples varied from B2C to practically BC2 in the case of using an additional C target. According to the XPS data, it corresponds to the different chemical states of the boron atom. A nanoindentation study showed that the film with a composition close to B2C deposited with the highest B4C target power reached a hardness of 25 GPa and Young’s modulus of 230 GPa. The optical properties of the films also depend on the composition, so the band gap (Eg) of the BCx film varied in the range of 2.1–2.8 eV, while the Eg of the carbon-rich films decreased to 1.1 eV.

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Section: Film Structure Composition and Bonding Typessupporting

confidence: 89%

“…It is known that BCx films obtained by magnetron sputtering have an amorphous structure when synthesized up to 900 °C. [48].…”

Section: Film Structure Composition and Bonding Typesmentioning

confidence: 99%

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Room-Temperature Formation of Hard BCx Films by Low Power Magnetron Sputtering

2021

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“…In addition, the roles of intrinsic defects in the electrochemical performance of B 4 C electrodes have also been studied [ 34 ]. Moreover, boron carbide has excellent chemical stability and low-volume expansion [ 35 , 36 ]. Even though it has relatively slower ionic transport kinetics, boron carbide has been indicated in previous studies to have great potential for use in energy storage devices [ 29 , 30 , 31 , 32 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Boron Carbide as an Electrode Material: Tailoring Particle Morphology to Control Capacitive Behaviour

et al. 2023

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In this study, boron carbide powders consisting mainly of nano/micro fibers or polyhedral-equiaxed particles were synthesized via the sol–gel technique, and the influence of particle morphology on electrochemical performance of boron carbide electrodes was investigated. Thermal decomposition duration of the precursors played a determinant role in the final morphology of the synthesized boron carbide powders. The morphology of boron carbide powders successfully tuned from polyhedral-equiaxed (with ~3 µm average particle size) to nano/micro fibers by adjusting the thermal decomposition duration of precursors. The length and thickness of fibers were in the range of 30 to 200 µm and sub-micron to 5 µm, respectively. The electrochemical performance analysis of boron carbide powders has shown that the particle morphology has a considerable impact on the boron carbide electrodes electrochemical performance. It was found that the synergetic effects of polyhedral-equiaxed and nano/micro fiber morphologies exhibited the best electrochemical performance in supercapacitor devices, resulting in the power and energy density of 34.9 W/kg and 0.016 Wh/kg, respectively.

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“…Formation of B 4 C boron carbide in the surface layer is often used to improve tribological properties of various materials [31]. Tang et al in [32] studied the wear of Al-5083 composite material strengthened by B 4 C boron carbides.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Wear Resistance of Borided Steel C45

2020

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The wear resistance of diffusion coatings in conditions of specific pressures of 3, 7 and 10 MPa was studied. The boride coatings were prepared by means of diffusion methods using C45 steel as the substrate material. Research on the microstructure and redistribution of chemical elements on wear surface of a borided layer was carried out. It was found that the boride coatings should be used under a specific pressure of 7 MPa. It was found that the wear of friction couple coating of steel C45 under specific pressure of 3 MPa proceeds according to the oxidation wear mechanism, while under specific pressures of 7 and 10 MPa the abrasive wear prevails. The wear-induced segregation of atoms in coatings was studied using secondary mass-spectroscopy method (SIMS). Increased C, O, and B concentrations were noticed at the wear surface on depth from 50 to 2000 Å. The secondary wear-induced structure formation on the wear surface resulted in high wear resistance of diffusion borided coatings.

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Boron carbide coating to improve the chemical stability of nm-thick graphite films

Cited by 10 publications

References 18 publications

Room-Temperature Formation of Hard BCx Films by Low Power Magnetron Sputtering

Room-Temperature Formation of Hard BCx Films by Low Power Magnetron Sputtering

Boron Carbide as an Electrode Material: Tailoring Particle Morphology to Control Capacitive Behaviour

Analysis of Wear Resistance of Borided Steel C45

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