Carbothermal Reduction and Nitridation of Çanakkale Origin Kaolin for SiAlON Powder Production

Ultrafine β-sialon powder is synthesized by citrate sol-gel and carbothermal reduction and nitridation (CRN) process. The presence of small amounts of β-sialon as crystal seed can obviously accelerate the formation of final β-sialon product and lower its formation temperature. The effects of nitriding temperature on the formation of the final β-sialon are investigated. The mean particle size of the prepared β-sialon powder is 100 ~ 150 nm. The β-sialon precursor gel and the ultrafine β-sialon powder are characterized by XRD, TG-DTA and SEM. The isoelectric point of ultrafine β-sialon is pH 2.46.

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Fabrication and Analysis of β-Sialon Whiskers from Fly Ash by Carbon Thermal Reduction-Nitridation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.723.610 ◽

2015 ◽

Vol 723 ◽

pp. 610-614

Author(s):

Jing Zhang ◽

Jiang Long Yu ◽

Huan Zhao ◽

Jun Shuai Liu

Keyword(s):

Fly Ash ◽

Reaction Time ◽

Carbon Content ◽

Reaction Temperature ◽

Carbothermal Reduction ◽

Thermal Reduction ◽

Optimal Temperature ◽

Nitridation Process ◽

Best Parameter ◽

Sialon Powder

β-Sialonwhiskers which the molecular structuralformula of β-Sialonis Si3Al3O3N5(z = 3) were synthesized from fly ash and graphite under appropriate technological conditions by carbothermal reduction–nitridation process. The effects of carbon content, reaction temperature and reaction time on synthesis ofβ-Sialonwere analysed by XRD, SEM techniques. The results proved that, the condition of the carbon content over 80% is the best parameter to promote theβ-Sialon powder production. Compared to other kinds of temperature, 1430 °C is the optimal temperature to promoteβ-Sialon powder generation. Compared to 3h, holding time of 6h is promoting theβ-Sialon powder generation.The main morphology of β-Sialon was rod-like whisker.

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Nano β-SiAlON Powder Synthesized by Carbothermal Reduction and Nitridation of Ultrafine Al2O3-SiO2 Mixture Employing Sol-Gel Techniques

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.237.117 ◽

2003 ◽

Vol 237 ◽

pp. 117-122 ◽

Cited By ~ 2

Author(s):

Q. Li ◽

C. Zhang ◽

Katsutoshi Komeya ◽

Junichi Tatami ◽

Takeshi Meguro ◽

...

Keyword(s):

Carbothermal Reduction ◽

Sol Gel ◽

Sialon Powder

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Synthesis of Rod-Like High-Purity β-Sialon Powder by a Novel Carbothermal Reduction-Nitridation Method with a Nanocasting Procedure

Journal of the American Ceramic Society ◽

10.1111/j.1551-2916.2010.03806.x ◽

2010 ◽

Vol 93 (9) ◽

pp. 2470-2472 ◽

Cited By ~ 12

Author(s):

Qiang Yan ◽

Qian Liu ◽

Qingfeng Liu

Keyword(s):

High Purity ◽

Carbothermal Reduction ◽

Sialon Powder

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Synthesis of .BETA.-SiAlON Powder by Carbothermal Reduction and Nitridation(3). Reaction Process of .BETA.-SiAlON (Z=3).

Journal of the Japan Society of Powder and Powder Metallurgy ◽

10.2497/jjspm.41.188 ◽

1994 ◽

Vol 41 (2) ◽

pp. 188-192

Author(s):

Chitake Yamagishi ◽

Keizou Tsukamoto ◽

Tatsuya Shiogai ◽

Mutsuo Hayashi ◽

Takayoshi Iseki

Keyword(s):

Carbothermal Reduction ◽

Reaction Process ◽

Sialon Powder

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Carbothermal Reduction and Nitridation of Çanakkale Origin Kaolin for SiAlON Powder Production

Materials Science Forum ◽

10.4028/www.scientific.net/msf.554.169 ◽

2007 ◽

Vol 554 ◽

pp. 169-174 ◽

Cited By ~ 1

Author(s):

Zafer Tatli ◽

Adem Demir ◽

F. Caliskan

Keyword(s):

Clay Mineral ◽

Flow Rate ◽

Gas Flow ◽

Ceramic Powder ◽

Particulate Composite ◽

Holding Time ◽

Gas Flow Rate ◽

Preparation Methods ◽

Powder Production ◽

Sialon Powder

SiAlON ceramics were successfully produced in the form of powders from high purity kaolin, a hydrated aluminium silicate, Al2Si2O5(OH)4 type of clay mineral (comprises 83.85% kaolinite, 13.59% quartz, 0.88% feldspar, 1.37% others) of Canakkale-Can origin. Factors affecting SiAlON powder production were temperature, holding time, gas-flow rate and preparation methods. System optimisation was achieved following the results succeeded from numerous testing and characterisation (with XRD, SEM, EDS, BET, etc.) of each test. Changing in gas flow rate, temperature and holding time at plateau temperature had influences on the final powder yield, their morphologies and phase formation. The best conversion of kaolin clay mineral to SiAlON ceramic powder was the test run at 1475oC for 4 hour under 1 lt/min N2-flow. Product after the process was mainly of β'- Si3Al3O3N5 (z=3) powder along with small amounts of Al2O3, mullite and AlN phases. Some powder product exhibits furry type of wiskers morphology, which may be useful for using as a reinforcing material in particulate composite bodies.

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