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Carbonitriding of Clay: Relation between the Weight Loss and Crystalline Phases during Reaction
Author(s) -
Mazzoni Alfredo D.,
Aglietti Esteban E,
Pereira Enrique
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb07773.x
Subject(s) - mullite , sialon , carbonitriding , materials science , pellets , mineralogy , calcination , chemical engineering , metallurgy , chemistry , sintering , composite material , organic chemistry , catalysis , ceramic , engineering
β'‐Sialons are phases of the Si‐Al‐O‐N system. The carbonitriding of clays and kaolins is a preparation method. The reaction mechanism of clay carbonitriding is verified by means of the relation among crystalline phases formed and the weight loss produced in the samples during the reaction. Two clays were previously mixed with carbon black and pressed into pellets, flowing through N 2 atmosphere, at five temperatures within the range 1335–1427°C. The phases formed (XRD)—mullite, SiC, β′A‐sialon, and oxynitrides—were related to the weight loss measured in the pellet independently of reaction temperature and time. The β′A‐sialon and the nitrogenous phases were formed from SiC and mullite. A z value decrease for β′A‐sialon was observed during reaction progression.