Effect of dilution and additive on direct nitridation of ferrosilicon

Wang, Yaohui; Cheng, Laifei; Guan, Jiasuo; Zhang, Litong

doi:10.1016/j.jeurceramsoc.2013.10.021

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…The FeSi75Al2 (ISO 5445-80) ferrosilicon with a particle size less than 75 μm and a silicon content of 75% (Ningxia Puhua Metallurgical Products Co., Ltd., Qingtongxia, China) and nitrogen gas (99.999% purity, Xi’an Weiguang Gas Co., Ltd., Xi’an, China) were used as the main raw materials while self-made ferrosilicon nitride (Nitrogen content ≈ 30%) served as diluents. The element composition of FeSi75Al2 ferrosilicon were shown in Table 1 , as our previous work [ 18 ] reported, the ferrosilicon alloy was a two-phase material consisting of silicon and high-temperature lebeauite FeSi 2 , and the role of ferrosilicon nitride diluents consist of α-Si 3 N 4 , β-Si 3 N 4 , Fe 3 Si, and some residual free silicon according to the results of X-ray diffraction (XRD) analysis is to decrease the reaction rate and prevent the melt droplets coalescence which results in low nitridation degree.…”

Section: Methodsmentioning

confidence: 82%

Fabrication and Characterization of Short Silicon Nitride Fibers from Direct Nitridation of Ferrosilicon in N2 Atmosphere

et al. 2018

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Short silicon nitride fibers were fabricated by direct nitridation of ferrosilicon in N2 atmosphere, and their structure and possible growth mechanism were characterized and investigated. The rod-like fibers which were α-Si3N4 with a low degree of crystallization and a high aspect ratio had a diameter of about 4 μm and a length close to a few millimeters. Belt-like fibers with a width about 5 μm and a thickness about 1 μm were also found in the nitrides. Scanning electron microscope (SEM), transmission electron microscope (TEM), high resolution transmission electron microscope (HRTEM), and selected area electron diffraction (SAED) investigations indicated that the fibers were single-crystalline α-Si3N4 with few amorphous distributed in the edge region, and the fibers grew by vapor–liquid–solid (VLS) mechanism.

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Section: Methodsmentioning

confidence: 82%

Fabrication and Characterization of Short Silicon Nitride Fibers from Direct Nitridation of Ferrosilicon in N2 Atmosphere

et al. 2018

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“…Since α‐Si 3 N 4 powders play an important role in the preparation of high‐performance silicon nitride ceramics, various routes have been proposed to synthesize α‐Si 3 N 4 . For instance, α‐Si 3 N 4 fibers have been fabricated by directing nitridation, 6 granular α‐Si 3 N 4 particles prepared by carbothermal reduction of SiO 2 , 7 and α‐Si 3 N 4 whiskers have been formed by catalytic nitridation and chemical vapor deposition (CVD) 8, 9 . Unfortunately, all these methods suffer from a common drawback, that is, difficulty in formation of monophase α‐Si 3 N 4 due to Si melting and α → β phase transformation on nitridation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of monophase two‐dimensional α‐Si₃N₄ nanoplatelets via an ionothermal route

Wang

Liang

et al. 2021

Int J Applied Ceramic Tech

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Silicon nitride (Si 3 N 4 ) is one of the most desirable candidate materials for high-temperature ceramics, electronic components, aerospace, and machinery, owing to its hightemperature strength, high intrinsic thermal conductivity, low dielectric loss, excellent physical/chemical stability, and good mechanical properties. [1][2][3][4] Si 3 N 4 powders generally contain α and β phases, and the content of the former is an important criterion for evaluating their quality. As well documented, α → β phase transformation can further occur at temperatures as low as 1600°C, which promotes sintering and grain growth of Si 3 N 4 ceramics, improving their mechanical properties and thermal conductivity. 5 Since α-Si 3 N 4 powders play an important role in the preparation of high-performance silicon nitride ceramics,

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“…To tackle this problem, a novel refractory material, ferro-silicon nitride (Fe-Si 3 N 4 ) has been developed and has successfully replaced the relatively expensive Si 3 N 4 [5,6]. Using the ferro-silicon alloy FeSi75 as the raw material, Fe-Si 3 N 4 powder can be synthesized by direct nitridation [7,8,9] or self-propagating high-temperature synthesis [10,11,12,13] under nitrogen atmosphere. Owing to the catalytic effect of Fe, a lower nitridation temperature and higher reaction rate can be achieved [7,14,15].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Si3N4-Fe3Si Composites Prepared by Gas-Pressure Sintering

Guan

Cheng

2018

Materials

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Si3N4-Fe3Si composites were prepared using Fe-Si3N4 as the source of Fe3Si by gas-pressure sintering. By adding different amounts of Fe-Si3N4 into the starting powders, Si3N4-Fe3Si composites with various Fe3Si phase contents were obtained. The microstructure and mechanical properties of the composites were investigated. With the increase of Fe-Si3N4 contents, the content and particle size of Fe3Si both increased. When more than 60 wt. % Fe-Si3N4 were added, the abnormal growth of Fe3Si particles occurred and oversized Fe3Si particles appeared, leading to non-uniform microstructures and worse mechanical properties of the composites. It has been found that Fe3Si particles could toughen the composites through particle pull-out, interface debonding, crack deflection, and particle bridging. Uniform microstructure and improved mechanical properties (flexural strength of 354 MPa and fracture toughness of 8.4 MPa·m1/2) can be achieved for FSN40.

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Effect of dilution and additive on direct nitridation of ferrosilicon

Cited by 8 publications

References 20 publications

Fabrication and Characterization of Short Silicon Nitride Fibers from Direct Nitridation of Ferrosilicon in N2 Atmosphere

Fabrication and Characterization of Short Silicon Nitride Fibers from Direct Nitridation of Ferrosilicon in N2 Atmosphere

Synthesis of monophase two‐dimensional α‐Si₃N₄ nanoplatelets via an ionothermal route

Microstructure and Mechanical Properties of Si3N4-Fe3Si Composites Prepared by Gas-Pressure Sintering

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Effect of dilution and additive on direct nitridation of ferrosilicon

Cited by 8 publications

References 20 publications

Fabrication and Characterization of Short Silicon Nitride Fibers from Direct Nitridation of Ferrosilicon in N2 Atmosphere

Fabrication and Characterization of Short Silicon Nitride Fibers from Direct Nitridation of Ferrosilicon in N2 Atmosphere

Synthesis of monophase two‐dimensional α‐Si3N4 nanoplatelets via an ionothermal route

Microstructure and Mechanical Properties of Si3N4-Fe3Si Composites Prepared by Gas-Pressure Sintering

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Synthesis of monophase two‐dimensional α‐Si₃N₄ nanoplatelets via an ionothermal route