Volatile products formed by carboreduction and nitridation of clay mixtures with silica and elemental silicon

被引：11

作者：

Ekstrom, TC ^{[1
]}

MacKenzie, KJD ^{[1
]}

White, GV ^{[1
]}

Brown, IWM ^{[1
]}

Barris, GC ^{[1
]}

机构：

[1] IND RES LTD, LOWER HUTT, NEW ZEALAND

来源：

JOURNAL OF MATERIALS CHEMISTRY | 1996年 / 6卷 / 07期

关键词：

D O I：

10.1039/jm9960601225

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Simultaneous carboreduction and nitridation (CRN) bf clays provides a useful route for the preparation of low-cost beta-sialon powders. During the course of the CRN reaction at 1400-1450 degrees C, mass losses of ca. 10% in excess of the theoretical amounts are typically found. This discrepancy is mainly due to transport of gaseous SiO from the reactants into the N-2-CO gas stream, followed by condensation in the cooler parts of the furnace system. In this work, the condensed material lost from the reacting system was collected under controlled conditions, and its constitution studied by Al-27 and Si-29 magic-angle spinning nuclear magnetic resonance (MAS NMR) and complementary X-ray powder diffraction (XRD). Predictions from thermodynamic. calculations of the various possible gas-phase reactions are compared with the observed results.

引用

页码：1225 / 1230

页数：6

共 26 条

[1] REACTION SEQUENCES IN THE SYNTHESIS OF SILICON-NITRIDE FROM QUARTZ [J].