Sialons from natural aluminosilicates

Journal Article · Fri Jul 01 04:00:00 EDT 1988 · Advanced Ceramic Materials; (USA)

DOI:https://doi.org/10.1111/j.1551-2916.1988.tb00236.x· OSTI ID:6074034

Mukerji, J; Bandyopadhyay, S ^[1]

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1. Central Glass and Ceramic Research Institute, Calcutta (India)

The synthesis of the high-temperature material sialon (Si{sub 6{minus}z}Al{sub z}O{sub z}N{sub 8{minus}z}) by carbothermic reduction followed by nitridation has been examined. Kaolin, sillimanite, and pyrophillite can be converted to {beta}{prime}-sialon having z values of 2, 2.5, and 0.8, respectively. Other phases that appear in small quantities along with the sialon are mainly alumina and mullite, and trace amounts of AlN and the AlON spinel phase also form. The carbon content at {ge}90% theoretical is very sensitive to nitrogen uptake and phase composition. The uniform mixing of carbon with clay is equally important. Fireclay without an Fe{sub 2}O{sub 3} catalyst produces the same product that does kaolin with an Fe{sub 2}O{sub 3} catalyst.

• OSTI ID: 6074034
• Journal Information: Advanced Ceramic Materials; (USA), Journal Name: Advanced Ceramic Materials; (USA) Vol. 3:4; ISSN 0883-5551; ISSN ACEME
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ALUMINIUM SILICATES
CHALCOGENIDES
CHEMICAL REACTIONS
CLAYS
DATA
DIAGRAMS
EXPERIMENTAL DATA
INFORMATION
KAOLIN
MEASURING METHODS
MINERALS
NITRIDATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE DIAGRAMS
PYROPHYLLITE
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SYNTHESIS