Compositional variation of sialon phase produced after carbothermal reduction and nitridation of vermiculite-polyacrylonitrile intercalation compound

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Materials Research Bulletin; (United States)

DOI:https://doi.org/10.1016/0025-5408(94)90091-4· OSTI ID:6934071

Aviles, M A; Sanchez-Soto, P J; Justo, A; Perez-Rodriguez, J L ^[1]

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1. Univ. de Sevilla (Spain). Instituto de Ciencia de Materiales

Vermiculite (Al-Mg hydrated layer silicate) has been used as raw material for the synthesis of nitrogen ceramics in the Si-Al-Mg-O-N system in the presence of carbon. Successive intercalation of butylammonium cation and acrylonitrile, followed by polymerization and cyclization of the polymer and thermal treatment under nitrogen flow, have produced the carbothermal reduction and reactive nitridation of the precursor, yielding [beta]-Si[sub 3]N[sub 4] and [beta]-sialon as nitrided phases. Thermal evolution of the intercalated samples from 1,000 C to 1,500 C has been studied by XRD and IR spectroscopy. The composition variation of sialon phase was found to be a function of heating temperature and soaking time at 1,400 C. These facts were explained on the basis of a complex vapor-liquid-solid mechanism.

• OSTI ID: 6934071
• Journal Information: Materials Research Bulletin; (United States), Vol. 29:10; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
SYNTHESIS
SILICON NITRIDES
CHEMICAL COMPOSITION
CLATHRATES
PHASE STUDIES
TEMPERATURE DEPENDENCE
ALUMINIUM COMPOUNDS
CHALCOGENIDES
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication