A microwave method for the preparation and sintering of {beta}'-SiAlON

A microwave-assisted carbothermal reduction and nitridation (CTR/N) method has been used for successful preparation of monophasic {beta}'-SiAlON starting from kaolinite and carbon black. Phase pure {beta}'-SiAlON has been obtained in under 60 min in microwave field. The z value of microwav...

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Bibliographic Details
Published in:Materials research bulletin 2003-03, Vol.38 (4)
Main Authors: Panneerselvam, M., Rao, K.J
Format: Article
Language:English
Subjects:
ALUMINIUM 27
ALUMINIUM OXIDES
CARBON BLACK
CERAMICS
CHEMICAL PREPARATION
IRRADIATION
KAOLINITE
MATERIALS SCIENCE
MICROWAVE RADIATION
NITRIDATION
NUCLEAR MAGNETIC RESONANCE
POWDERS
REACTION KINETICS
SILICON 29
SILICON NITRIDES
SINTERING
X-RAY DIFFRACTION
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Summary:A microwave-assisted carbothermal reduction and nitridation (CTR/N) method has been used for successful preparation of monophasic {beta}'-SiAlON starting from kaolinite and carbon black. Phase pure {beta}'-SiAlON has been obtained in under 60 min in microwave field. The z value of microwave prepared {beta}'-SiAlON is found to be 2.95, which is very close to the expected value from kaolinite composition. Formation of {beta}'-SiAlON has been monitored with XRD and MASNMR of {sup 29}Si and {sup 27}Al; the possible reaction mechanism has been discussed. Kaolinite to {beta}'-SiAlON conversion appears to be a very rapid single-step reaction under microwave irradiation. {beta}'-SiAlON powders have been microwave sintered to 98.7% of theoretical density in 30 min.
ISSN:0025-5408
1873-4227
DOI:10.1016/S0025-5408(02)01071-1