Structure and properties of nano SiC coatings in-situ fabricated by laser irradiation

Luo, Fang; Jiang, Rongjie; Hu, Xiaodong; He, Zhen; Wang, Yuxin

doi:10.1016/j.ceramint.2020.02.279

Cited by 13 publications

(3 citation statements)

References 25 publications

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“…FT-DFT and AIMD calculations were carried out using the generalized gradient approximation with the exchange correlation energy functional as proposed by Perdew-Burke-Erzenhof (PBE) [32]. The projector augmented-wave (PAW) method was used to describe the electron-ion interactions [33,34], as implemented in the Vienna ab initio simulation package (VASP) [35], version 6.2.1, where the following PAW valence states 4d 10 , 5s 1 and 4s 2 , 4p 5 for Ag and Br were employed, respectively. The equilibrium geometries for AgBr were obtained by stress-tensor minimization with a plane wave expansion cutoff of 500 eV, while the force optimization cutoff was 281 eV, which is 12.5% larger than the cutoff energy recommended by the VASP package.…”

Section: Theoretical Approach and Computational Detailsmentioning

confidence: 99%

“…Femtosecond laser irradiation (FLI) on semiconductor structures has attracted the attention of the scientific community due to its ability to produce and functionalize new materials by engineering their structure, and the electronic and optical properties [1][2][3][4], with applications in medicine and the electronic industry [5][6][7]. FLI induces structural changes and electronic excitation on the irradiated material [8].…”

Section: Introductionmentioning

confidence: 99%

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Formation of Metallic Ag on AgBr by Femtosecond Laser Irradiation

et al. 2022

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Laser irradiation of materials induces changes in their structure and functional properties. In this work, lattice heating and electronic excitation on silver bromide (AgBr), provoked by femtosecond laser irradiation, have been investigated by finite-temperature density functional theory and ab initio molecular dynamics calculations by using the two-temperature model. According to our results, the electronic temperature of 0.25 eV is enough to excite the electrons from the valence to the conduction band, whereas 1.00 eV changes the structural properties of the irradiated AgBr material. Charge density simulations also show that an Ag clustering process and the formation of Br3− complexes take place when the electronic temperature reaches 2.00 eV and 5.00 eV, respectively. The present results can be used to obtain coherent control of the extreme nonequilibrium conditions due to femtosecond laser irradiation for designing new functional materials.

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Section: Theoretical Approach and Computational Detailsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Formation of Metallic Ag on AgBr by Femtosecond Laser Irradiation

et al. 2022

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“…Several methods are used to prepare SiC coatings. Pack cementation is cheap, simple, and it has no sample shape requirements [14][15][16][17][18]. Through the use of this technique, all layers of a surface can be coated using a single process.…”

Section: Introductionmentioning

confidence: 99%

Addition of Si3N4 Strengthens SiC Coatings via Heat Treatment with Nitrogen Gas onto Carbon/Carbon Composites

Mao

Yang

2020

Coatings

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We report the synthesis of SiC/Si3N4 coatings on carbon/carbon composites via pack cementation and heat treatment with nitrogen gas, the latter of which improves the coating wear resistance. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) are used to analyse the microstructure, surface morphology, chemical states and elemental distribution, respectively, of SiC and SiC/Si3N4 coatings. In addition, we analyse the tribological behaviour of the SiC and SiC/Si3N4 coatings and the related microstructure and wear mechanisms. The results show that SiC/Si3N4 coatings are compact and contain the three phases: Si3N4, SiC and C. Additionally, specimens with the SiC/Si3N4 coating have smaller, more stable friction coefficients and less weight loss than specimens with only the SiC coating. Adhesive wear and abrasive wear are the main wear mechanisms contributing to the higher friction coefficient of the SiC coating. Furthermore, with the SiC/Si3N4 coating, adhesive wear is the main wear mechanism causing a high friction coefficient at the initial stage of frictional wear. In the subsequent stages of frictional wear, the graphite in the SiC/Si3N4 coating generates a thin lubricating film that decreases the friction coefficient.

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