Sintering behavior of porous wall tile bodies during fast single-firing process

A fast single-firing porous wall tile mixture was prepared using raw materials from the North Fluminense region in Brazil. Specimens were obtained by uniaxial pressing and sintered in air at various temperatures (1080-1200 C) using a fast-firing cycle (60 min). Evolution of the microstructure was fo...

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2005-06, Vol.8 (2), p.197-200
Main Authors: Sousa, Sidnei José Gomes, Holanda, José Nilson França de
Format: Article
Language:English
Subjects:
ENGINEERING, CHEMICAL
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
microstructure
properties
sintering
wall tile
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Summary:A fast single-firing porous wall tile mixture was prepared using raw materials from the North Fluminense region in Brazil. Specimens were obtained by uniaxial pressing and sintered in air at various temperatures (1080-1200 C) using a fast-firing cycle (60 min). Evolution of the microstructure was followed by XRD and SEM. The results revealed that the main phases formed during the sintering step were anorthite, gehlenite and haematite. It appeared that the sintering process was characterised by the presence of a small amount of a liquid phase below 1140 C. As a result, the microstructure of the ceramic bodies showed a network of small dense zones interconnected with a porous phase. In addition, the strength of the material below 1140 C appeared to be related to the type and quantity of crystalline phases in the sintered bodies. 14 refs.
ISSN:1516-1439
1980-5373
1516-1439
DOI:10.1590/S1516-14392005000200020