Formation of Gehlenite (Ca2Al2SiO7) by Carbothermal Reduction of Carbonized Rice Hulls

Vapor deposition products were formed in the cold zone (920-1120°C) during synthesis of SiC from carbonized rice hulls (CRHs) in the reaction zone (1500°C) of a vacuum tube furnace during carbothermal reduction. Crystals of gehlenite (Ca2Al2SiO7) and β-SiC whiskers were identified by X-ray diffracti...

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Veröffentlicht in:	Journal of the Ceramic Society of Japan 1999/11/01, Vol.107(1251), pp.1115-1117
Hauptverfasser:	HAN, Hsiung-Wen, HUANG, Chi-Yen, LIU, Hok-Shing
Format:	Artikel
Sprache:	eng
Schlagworte:	Carbonized rice hulls (CRH) Carbothermal reduction Cold zone Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Exact sciences and technology Gehlenite (Ca2Al2SiO7) Growth from vapor Materials science Methods of crystal growth physics of crystal growth Physics Reaction zone Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Vapor deposition process Whiskers and dendrites (growth, structure, and nonelectronic properties)
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Zusammenfassung:	Vapor deposition products were formed in the cold zone (920-1120°C) during synthesis of SiC from carbonized rice hulls (CRHs) in the reaction zone (1500°C) of a vacuum tube furnace during carbothermal reduction. Crystals of gehlenite (Ca2Al2SiO7) and β-SiC whiskers were identified by X-ray diffraction (XRD) and scanning transmission electron microscopy (STEM) to be the major deposits. A minor product, suessite (Fe3Si), appeared to have catalyzed the growth of gehlenite. The results of this study suggest the feasibility of preparing gehlenite materials by a vapor deposition process.
ISSN:	0914-5400 1882-1022
DOI:	10.2109/jcersj.107.1115