A Study of Sialon Synthesis from Kaolin by Carbothermal Reduction and Simultaneous Nitriding

A Study of Sialon Synthesis from Kaolin by Carbothermal Reduction and Simultaneous Nitriding X-ray diffraction, derivatographic analysis, and the BET method are used to study the processes of synthesis of sialons by carbothermal reduction and simultaneous nitriding of kaolin of the Kyshtymskoe deposit. The synthesis is performed by roasting a mixture of kaolin with colloidal graphite S-1 poured freely or pressed into specimens in a discontinuous-flow furnace with a graphite heater. The influence of the synthesis conditions on the phase composition, the specific surface of the powders, the gas permeability, and the pore size in sialon specimens is established. It is shown that when pressings fabricated from kaolin mixed with graphite S-1 are roasted in nitrogen, the resulting material can have a porosity of 60% with pores < 1 μm in size and a gas permeability of 0.02 – 0.08 μm2, which can become a basis for developing a technology of membrane materials. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Refractories and Industrial Ceramics Springer Journals

A Study of Sialon Synthesis from Kaolin by Carbothermal Reduction and Simultaneous Nitriding

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Publisher
Springer Journals
Copyright
Copyright © 2000 by Plenum Publishing Corporation
Subject
Materials Science; Characterization and Evaluation of Materials; Materials Science, general; Ceramics, Glass, Composites, Natural Materials
ISSN
1083-4877
eISSN
1573-9139
D.O.I.
10.1023/A:1011372820939
Publisher site
See Article on Publisher Site

Abstract

X-ray diffraction, derivatographic analysis, and the BET method are used to study the processes of synthesis of sialons by carbothermal reduction and simultaneous nitriding of kaolin of the Kyshtymskoe deposit. The synthesis is performed by roasting a mixture of kaolin with colloidal graphite S-1 poured freely or pressed into specimens in a discontinuous-flow furnace with a graphite heater. The influence of the synthesis conditions on the phase composition, the specific surface of the powders, the gas permeability, and the pore size in sialon specimens is established. It is shown that when pressings fabricated from kaolin mixed with graphite S-1 are roasted in nitrogen, the resulting material can have a porosity of 60% with pores < 1 μm in size and a gas permeability of 0.02 – 0.08 μm2, which can become a basis for developing a technology of membrane materials.

Journal

Refractories and Industrial CeramicsSpringer Journals

Published: Oct 7, 2004

References

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