Effects of α- and β-Si3N4 as precursors on combustion synthesis of (α+β)-SiAlON composites

Yeh, C.L.; Wu, F.S.; Chen, Y.L.

doi:10.1016/j.jallcom.2010.12.201

Cited by 28 publications

(12 citation statements)

References 29 publications

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“…[14]. Moreover, the formation of β-SiAlON releases less energy compared to α-SiAlON [15]; correspondingly, the overall energy released from the exothermic reaction was lower, and exhibited a lower combustion temperature. MgCl 2 (in mass %), using CaCO 3 as the Ca-source, are displayed in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, the CS of SiAlONs with Si, Al, SiO 2 , or other metal oxides under N 2 at a specific applied pressure usually gives a low product yield owing to the existence of unreacted Si, caused by the melting and coalescence of silicon particles at the combustion front. To decrease the combustion temperature as well as to reduce the overall heat released from nitridation of Al and Si, it is necessary to add a large amount of Si 3 N 4 and AlN instead of Si and Al [15,16]. In addition, NH 4 Cl or NH 4 F additives are also required to be added to the starting materials in order to achieve complete nitridation [13,17].…”

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confidence: 99%

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Fabrication of mixed α/β-SiAlON powders via salt-assisted combustion synthesis

Niu

Harada²,

Suzuki

et al. 2014

Journal of Alloys and Compounds

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High-quality Y-and Ca-α/β-SiAlON and α-SiAlON ceramics were synthesized via salt-assisted combustion synthesis from Si, Al, and metal oxide (Y 2 O 3 and CaO) with the addition of NaCl and MgCl 2 under a nitrogen pressure of 1 MPa. NaCl and MgCl 2 were employed as they act as excellent diluents that effectively absorb the reaction heat through melting and evaporation. We found that the type of metal chlorides employed significantly affected the α/β ratio and the morphology of the product, with the use of NaCl affording high α/β ratios and equiaxed morphologies, while the use of MgCl 2 resulting in low α/β ratios and elongated grains. The results of this work suggest that high-purity α/β-SiAlON composite products of intended α/β ratios can be successfully fabricated by controlling the initial metal chloride content.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Fabrication of mixed α/β-SiAlON powders via salt-assisted combustion synthesis

Niu

Harada²,

Suzuki

et al. 2014

Journal of Alloys and Compounds

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“…In all other works reporting of the fibrous morphology in the SHS products the combustion has taken place in metal/ gas mode [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Apparently, this is the key for combustion synthesis of ultrafine/nano-sized ceramic fibers.…”

Section: Discussionmentioning

confidence: 99%

Air-exposed combustion synthesis of Al2O3 nanofibers in Al/TiO2/C system

Amel-Farzad

Vahdati-Khaki

Haerian

2013

Ceramics International

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“…For the synthesis of Si 3 N 4 powder, direct nitridation, carbothermal reduction, vapor-phase reactions and thermal decomposition are the most commonly used processes [3,4]. Combustion synthesis (CS) of Si 3 N 4 powder is also an attractive technology because of its greater energy efficiency, higher product purity and shorter production cycle [5][6][7][8]. To prepare elongated b-Si 3 N 4 particles, we used a novel gel-cast-foam-assisted CS method.…”

Section: Introductionmentioning

confidence: 99%