Effect of atmosphere and heating rate on mechanism of MoSi2 formation during self-propagating high-temperature synthesis

Hasani, Saeed; Panjepour, Masoud; Shamanian, M.

doi:10.1007/s10973-011-1747-7

Cited by 16 publications

(4 citation statements)

References 17 publications

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“…Thermal analysis such as TG and DTA is recognized as one of the best methods to gain the thermal characteristics, mechanism and kinetic analysis of various transformations of materials. The simultaneous TG‐DTA curves of the stoichiometric metal nitrates without agarose and stoichiometric metal nitrates with 2.5 g agarose are presented in Figure A,B, respectively.…”

Section: Resultsmentioning

confidence: 99%

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

Rouhani

Esmaeil‐Khanian

Davar

et al. 2017

Int J Applied Ceramic Tech

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Hard‐magnetic CoFe2O4 nanoparticles were produced with the sol‐gel autocombustion route using agarose and citric acid as a neutral organic gel and combustion agent. For this purpose, the obtained gel is annealed at 800°C for 3 hours and then the spinel structure of the samples was confirmed by X‐ray diffraction (XRD). In addition, the existence of metal‐oxygen complexes in the gel and nanoparticles was investigated by Fourier transformation infrared (FTIR) spectra. Furthermore, FESEM images showed that semispherical and rod‐like particles were obtained by variation in agarose contents. For the rod‐like sample with 2.5 g agarose, the saturation magnetization and coercivity were measured equal to 71.7 emu/g and 10076.84 Oe, respectively.

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Section: Resultsmentioning

confidence: 99%

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

Rouhani

Esmaeil‐Khanian

Davar

et al. 2017

Int J Applied Ceramic Tech

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“…Cylindrical samples with a diameter of 2 mm and a length of 70 mm were produced by suction copper-mold casting. Solid-state processes have been extensively studied by using thermal analysis techniques [ 47 , 48 , 49 ]. Therefore, the thermal stability and isokinetic analysis of the as-cast specimens were evaluated by using a differential scanning calorimetry (DSC, NETZSCH DSC 404C, NETZSCH-Gerätebau GmbH, Selb, Germany) at continuous heating rates of 5, 10 and 20 °C/min.…”

Section: Methodsmentioning

confidence: 99%

Isokinetic Analysis of Fe41Co7Cr15Mo14Y2C15B6 Bulk Metallic Glass: Effect of Minor Copper Addition

et al. 2020

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In the present study, (Fe41Co7Cr15Mo14Y2C15B6)100−xCux (x = 0, 0.25 and 0.5 at.%) amorphous alloys were prepared by copper-mold casting. To clarify the effect of the minor addition of copper on the mechanism of nucleation and growth during the crystallization process, an isokinetic analysis was performed. The activation energies (E) of the various crystallization stages were calculated by using theoretical models including Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), Augis–Bennett and Gao–Wang methods. In addition, Augis–Bennett, Gao–Wang and Matusita methods were used to investigate the nucleation and growth mechanisms and to determine other kinetic parameters including Avrami exponent (n), the rate constant (Kp) and dimensionality of growth (m). The obtained results revealed that the activation energy—as well as thermal stability—was changed with minor addition of copper. In addition, the obtained Avrami exponent values were confirmed by Johnson–Mehl–Avrami–Kolmogorov (JMAK) method. The research findings demonstrated that the value of Avrami exponent is changed with minor addition of copper, so that the Avrami exponents of all crystallization stages, except the second peak for copper-free amorphous alloy, were equal to integer values ranging from two to four, indicating that the growth mechanisms were controlled by interface. Moreover, the kinetic parameters of n and b for all peaks were increased by an increase in crystallization temperature, which can be attributed to the increase in the nucleation rate.

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“…Thus, the drawbacks of this process lie in high-energy consumption and low product purity [19][20][21][22]. SHS process has been used so far as an inexpensive process, in which highly exothermic reactions between the constituents become self-sustaining and proceed via a combustion propagation wave through an entire sample, providing an attractive low cost alternative to conventional methods of producing advanced materials [23][24][25][26][27]. It should be noted that these exothermic reactions could be simply confined using diluents, etc., to avoid damaging the combustion chamber.…”

Section: Introductionmentioning

confidence: 99%

A three-step synthesis process of submicron boron carbide powders using microwave energy

Forouzan

Mousavian

Sharif

et al. 2015

J Therm Anal Calorim

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In this study, a three-step synthesis process is proposed for the production of submicron B 4 C powders. The initial step is the mechanical activation of a Mg-C-B 2 O 3 mixture, which is carried out by using a high-energy planetary ball mill. The second phase is the microwaveassisted combustion synthesis, used to fabricate the MgO-B 4 C composite powders. The final stage is an acid leaching for removing the MgO phase. The results of DSC, XRD, and SEM analyses indicated that mechanical activation was a vital process for microwave synthesis and that no starting powders were remained unreacted after microwave heating. A considerable reduction in reaction temperature was obtained from DSC analysis after mechanical activation process. TG results indicated that separated milling of Mg with B 2 O 3 powders would avoid the formation of gases during exothermic reactions. Finally, it was found that submicron boron carbide powders with an average crystallite size about 114 nm were produced with a high purity after acid leaching.

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Effect of atmosphere and heating rate on mechanism of MoSi2 formation during self-propagating high-temperature synthesis

Cited by 16 publications

References 17 publications

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

Isokinetic Analysis of Fe41Co7Cr15Mo14Y2C15B6 Bulk Metallic Glass: Effect of Minor Copper Addition

A three-step synthesis process of submicron boron carbide powders using microwave energy

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Effect of atmosphere and heating rate on mechanism of MoSi2 formation during self-propagating high-temperature synthesis

Cited by 16 publications

References 17 publications

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe2O4 nanoparticles prepared by sol‐gel autocombustion method

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe2O4 nanoparticles prepared by sol‐gel autocombustion method

Isokinetic Analysis of Fe41Co7Cr15Mo14Y2C15B6 Bulk Metallic Glass: Effect of Minor Copper Addition

A three-step synthesis process of submicron boron carbide powders using microwave energy

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Product

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The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method

The effect of agarose content on the morphology, phase evolution, and magnetic properties of CoFe₂O₄ nanoparticles prepared by sol‐gel autocombustion method