Synthesis of Sialon from Kaolin and Its Phase Formation

The main phase transformations during synthesis of β-sialon from kaolin of the Prosyanovskii deposit (Ukraine) under test-industrial production conditions have been studied. Sialon was prepared by carbothermal reduction in graphite-tube furnaces in nitrogen. It is shown that the process is character...

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Bibliographic Details
Published in:Powder metallurgy and metal ceramics 2003-07, Vol.42 (7-8), p.383-387
Main Authors: Grigor'ev, Oleg N, Panasyuk, Alla D
Format: Article
Language:English
Subjects:
Chemical reactions
Furnaces
Industrial production
Kaolin
Polytypes
Powder metallurgy
Sialons
Silicon carbide
Synthesis
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Summary:The main phase transformations during synthesis of β-sialon from kaolin of the Prosyanovskii deposit (Ukraine) under test-industrial production conditions have been studied. Sialon was prepared by carbothermal reduction in graphite-tube furnaces in nitrogen. It is shown that the process is characterized by the simultaneous occurrence of several chemical reactions with formation of intermediate phases (Si^sub 2^ON^sub 2^, X^sub 1^-phase), silicon carbide, and (apart from β-sialon) sialons based on AlN polytypes. The phase composition of the final product is determined not only by the charge composition but also by the set of production parameters. Results of the work may provide a basis for commercial preparation of sialon powder.[PUBLICATION ABSTRACT]
ISSN:1068-1302
1573-9066
DOI:10.1023/B:PMMC.0000004158.19602.aa