Synthesis of magnesium silicon nitride nanopowder by employing two-step method

Khajelakzay, Mohammad; Bakhshi, Saeed Reza; Borhani, Gholam Hossein

doi:10.1179/1743676115y.0000000005

Cited by 8 publications

(3 citation statements)

References 13 publications

(25 reference statements)

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“…oxides such as silica or magnesium oxide is not trivial and the material is very prone to oxidation. 7,11,12 In the presence of O 2 , Mg 2 Si decomposes to form MgO and Si. So far, there have been only few reports on tailoring of the morphology of Mg 2 Si by nanostructuring or the introduction of porosity, although nanoscopic and porous structures promise improved performances or even completely new properties, such as drastically reduced thermal conductivities.…”

Section: Introductionmentioning

confidence: 99%

Monolithic porous magnesium silicide

et al. 2017

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a Macroporous magnesium silicide monoliths were successfully prepared by a two-step synthesis procedure. The reaction of gaseous magnesium vapor with macro-/mesoporous silicon, which was generated from hierarchically organized meso-/macroporous silica by a magnesiothermic reduction reaction, resulted in monolithic magnesium silicide with a cellular, open macroporous structure. By adjusting the reaction conditions, such as experimental set-up, temperature and time, challenges namely loss of porosity or phase purity of Mg 2 Si were addressed and monolithic magnesium silicide with a cellular network builtup was obtained.

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Section: Introductionmentioning

confidence: 99%

Monolithic porous magnesium silicide

et al. 2017

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“…While when the Mg microparticles were heated in N 2 , the N atom content reached 25.54%, which could be attributed to the dissolution of the N atom into the liquid Mg. It is possible that the reaction between Mg vapor and N 2 was trigged, i.e., 3Mg (g) + N 2 (g) → Mg 3 N 2 (s) [28]. In air, the weight percentage of Mg in residues was 69.97%, that of O element is 27.73%, and those of the elements N and C are tiny.…”

Section: Analysis Of Combustion Residuesmentioning

confidence: 99%

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Yang

Lin

et al. 2021

Processes

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Although the gas phase combustion of metallic magnesium (Mg) has been extensively studied, the vaporization and diffusive combustion behaviors of Mg have not been well characterized. This paper proposes an investigation of the vaporization, diffusion, and combustion characteristics of individual Mg microparticles in inert and oxidizing gases by a self-built experimental setup based on laser-induced heating and microscopic high-speed cinematography. Characteristic parameters like vaporization and diffusion coefficients, diffusion ratios, flame propagation rates, etc., were obtained at high spatiotemporal resolutions (μm and tens of μs), and their differences in inert gases (argon, nitrogen) and in oxidizing gases (air, pure oxygen) were comparatively analyzed. More importantly, for the core–shell structure, during vaporization, a shock wave effect on the cracking of the porous magnesium oxide thin film shell-covered Mg core was first experimentally revealed in inert gases. In air, the combustion flame stood over the Mg microparticles, and the heterogeneous combustion reaction was controlled by the diffusion rate of oxygen in air. While in pure O2, the vapor-phase stand-off flame surrounded the Mg microparticles, and the reaction was dominated by the diffusion rate of Mg vapor. The diffusion coefficients of the Mg vapor in oxidizing gases are 1~2 orders of magnitude higher than those in inert gases. However, the diffusive ratios of condensed combustion residues in oxidizing gases are ~1/2 of those in inert gases. The morphology and the constituent contents analysis showed that argon would not dissolve into liquid Mg, while nitrogen would significantly dissolve into liquid Mg. In oxidizing gases of air or pure O2, Mg microparticles in normal pressure completely burned due to laser-induced heating.

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“…Khajelakzay et al [9] prepared MgSiN 2 nanopowders by mechanical alloying and heat treatment in two steps, using Mg/Si as starting mixtures and adding a small amount of stearic acid. Yang et al [29] synthesized single-phase MgSiN 2 powders starting from Mg/Si 3 N 4 by combustion synthesis, followed by acid washing.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of MgSiN<sub>2</sub> Powders from the Mg-Si System

Guo¹,

Yi²,

Liu³

et al. 2018

MSCE

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Magnesium silicon nitride (MgSiN 2 ) was synthesized without any additives under a nitrogen gas flow (200 mL/min) using a nitriding method. The effects of temperature and holding time on its purity and morphology were investigated. A single-phase MgSiN 2 powder was obtained at 1350˚C for 1 h and 1250˚C for 11 h. However, the decomposition of MgSiN 2 occurred at 1450˚C, suggesting that the optimum temperature for the preparation of MgSiN 2 from Mg-Si system was 1350˚C. The phase purity, morphology, size of the product and elemental composition of the samples were detected by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy spectrometer (EDS), respectively. The evaporation of Mg and Si resulted in the formation of many voids in the blocky product. The temperature gradient promotes the growth of MgSiN 2 on the surface of massive products along the tip. The concentration gradient of Mg and Si vapors in the void resulted in the columnar growth of MgSiN 2 .

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Synthesis of magnesium silicon nitride nanopowder by employing two-step method

Cited by 8 publications

References 13 publications

Monolithic porous magnesium silicide

Monolithic porous magnesium silicide

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Synthesis of MgSiN<sub>2</sub> Powders from the Mg-Si System

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Synthesis of magnesium silicon nitride nanopowder by employing two-step method

Cited by 8 publications

References 13 publications

Monolithic porous magnesium silicide

Monolithic porous magnesium silicide

Vaporization, Diffusion and Combustion of Laser-Induced Individual Magnesium Microparticles in Inert and Oxidizing Atmospheres

Synthesis of MgSiN&lt;sub&gt;2&lt;/sub&gt; Powders from the Mg-Si System

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Synthesis of MgSiN<sub>2</sub> Powders from the Mg-Si System