Synthesis of carbon-free Si3N4/SiC nanopowders using silica fume

Suri, Jyothi; Shaw, Leon L.; Zawrah, M.F.

doi:10.1016/j.ceramint.2011.06.003

Cited by 38 publications

(9 citation statements)

References 41 publications

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“…The silicon nitride phases (a and b) formed at higher C/SiO 2 ratios, indicating the further nitridation according to Reaction (2). A higher C/SiO 2 ratio resulted in a higher yield of aSi 3 N 4 , similar to the results reported by Ji et al 10 According to Suri et al, 18 excessive carbon can provide more sites for the nucleation of a-Si 3 N 4 crystals, and thus increases the phase concentration of a-Si 3 N 4 in the final product.…”

Section: Effect Of the C/sio 2 Molar Ratio On The Phase Transformatiosupporting

confidence: 86%

Preparation of Si3N4 Form Diatomite via a Carbothermal Reduction-Nitridation Process

Huang

Mei

et al. 2015

JOM

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Si 3 N 4 was produced using diatomite and sucrose as silicon and carbon sources, respectively. The effect of the C/SiO 2 molar ratio, heating temperature and soaking time on the morphology and phase compositions of the final products was investigated by scanning electron microscopy, x-ray diffraction analysis and energy dispersive spectroscopy. The phase equilibrium relationships of the system at different heating temperatures were also investigated based on the thermodynamic analysis. The results indicate that the phase compositions depended on the C/SiO 2 molar ratio, heating temperature and soaking time. Fabrication of Si 3 N 4 from the precursor via carbothermal reduction nitridation was achieved at 1550°C for 1-8 h using a C/SiO 2 molar ratio of 3.0. The as-prepared Si 3 N 4 contained a low amount of Fe 3 Si (<1 wt.%).

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Section: Effect Of the C/sio 2 Molar Ratio On The Phase Transformatiosupporting

confidence: 86%

Preparation of Si3N4 Form Diatomite via a Carbothermal Reduction-Nitridation Process

Huang

Mei

et al. 2015

JOM

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“…It is important to mention here that the raw materials of silicon carbide are relatively inexpensive (raw husk ash). Therefore, the final products are cost-competitive besides offering the advantages of superior technical performance over the other materials [2][3][4]. The researches on nanostructure SiC (nano-particles) are under extensive development.…”

Section: Introductionmentioning

confidence: 99%

Liquid Phase Sintering of Nano Silicon Carbide Prepared from Egyptian Rice Husk Ash waste

2021

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The aim of the present research is to prepare well dense sintered nano-SiC. Two samples of Nano-silicon carbide prepared by pyrolysis of rice-husk ashes as starting materials. The first was fine (hand-ground) rice-husk ash, and the second was prepared by ball milled technology. The firing temperature to obtain well crystalline nano SiC was 1550 o C. The effect of pyrolysis under vacuum atmosphere had been tested. Herein the liquid phase sintering is used as a good sintering technique. The oxides sintering additives (3 wt% Y2O3 and 7wt% Al2O3) play very crucial role in decreasing the apparent porosity and increasing the relative density of the sintered body if compared with that prepared without any oxide additives. Different sintering temperature firing range was applied here, and the optimum firing temperature that used to obtain well dense sintered SiC was 1950 o C. With decreasing additive content, the consolidation of the materials became increasingly dependent on solid-state sintering. The microstructure underwent a transition from a microcrystalline matrix with nano-crystalline second phase (micro-nano) to a nano-crystalline matrix with nano-crystalline second phase (nano-nano) when the yttria and alumina content was lowered to 3 wt%.

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“…Nano SiC have been studied intensively for high temperature structural applications, such as turbine and automobile engine components and heat exchangers, as well as energy applications [11,12]. Recently, using a process called as the integrated mechanical and thermal activation (IMTA) process, nano-SiC and SiC/Si 3 N 4 nanocomposite have been produced from silica fume at 1500 • C [13][14][15][16][17]. Since rice husk contains a higher silica content (15-20 wt.%), it should also be a promising material for producing nano SiC powder to reduce the cost of the starting raw materials, also while attaining the powder with nanostructures for advanced technology applications.…”

Section: Introductionmentioning

confidence: 99%

“…(i) cooking at lower temperature (400-800 • C) in a controlled manner to remove volatiles and (ii) reacting the cooked rice husk at high temperature (>1300 • C) to form SiC [1,[4][5]. The potential feature of rice husk is their high silica content (15)(16)(17)(18)(19)(20) wt.%) with small amount of alkalis and trace elements [6,7]. Heating the husks produces amorphous carbon as by-product of cellulose carbonization, while silica remains unchanged.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of SiC and SiC/Si3N4 composite nano powders from waste material

Zawrah

Zayed

Ali

2012

Journal of Hazardous Materials

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Synthesis of carbon-free Si3N4/SiC nanopowders using silica fume

Cited by 38 publications

References 41 publications

Preparation of Si3N4 Form Diatomite via a Carbothermal Reduction-Nitridation Process

Preparation of Si3N4 Form Diatomite via a Carbothermal Reduction-Nitridation Process

Liquid Phase Sintering of Nano Silicon Carbide Prepared from Egyptian Rice Husk Ash waste

Synthesis and characterization of SiC and SiC/Si3N4 composite nano powders from waste material

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