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Content archived on 2019-03-12

REINFORCING REFRACTORIES WITH CERAMIC RODLETS MADE OF FIRECLAY.

Objective



IMPROVEMENT OF THERMO-MECHANICAL PROPERTIES OF REFRACTORY CASTABLES BY THE USE OF FIRECLAY BASED CERAMIC RODLETS AS GROG MATERIAL.

STUDIES OF THE THERMO-MECHANICAL PROPERTIES OF FIRECLAY HAVE SHOWN THAT DENSE CERAMIC RODLETS WITH DIAMETERS BETWEEN 2 AND 7MM MADE OF UNSHORTENED FIRECLAYS HAVE EXTRAORDINARY MECHANICAL PROPERTIES IN THE TEMPERATURE RANGE FROM THE TRANSFORMATION INTERVAL OF CHAMOTTE-GLAS (700[C-800[C) TO THE MAXIMUM SERVICE TEMPERATURES OF THE VARIOUS CLAYS. THE MAIN ADVANTAGE OF RODLETS IS THAT THEY SHOW PLASTIC FLOW UNDER MECHANICAL STRESSES WITH REMARKABLE STRAIN BEFORE FAILURE.

STARTING FROM THIS PRELIMINARY WORK, THE RESEARCH AIMS TO PROVE THAT REFRACTORY PRODUCTS, ESPECIALLY CASTABLES, CAN BE REINFORCED BY PARTIALLY REPLACING ISOMETRIC GROG BY CERAMIC RODLETS.

THE RESULT OF THE STUDIES OUGHT TO BE THE IMPROVEMENT OF THE THERMO-MECHANICAL PROPERTIES OF REFRACTORY CASTABLES.

PRELIMINARY TRIALS HAVE SHOWN THAT THIS CAN BE ACHIEVED WITHOUT ANY CHANGE OF THE CHEMICAL COMPOSITION BY MEANS OF THE IMPROVED MECHANICAL PROPERTIES OF THE ROD-SHAPED GROG AND BY AN IMPROVED BONDING AND OVERLAPPING OF THE RODLETS WITHIN THE CASTABLE MATRIX. THIS NEW TYPE OF CHAMOTTE GROG LEADS TO AN IMPROVEMENT OF THE RAW MATERIAL FIRECLAY AND BY THIS TO AN ENLARGEMENT OF THE FIELD OF APPLICATION OF PRODUCTS BASED ON FIRECLAY.

THE RESEARCH WILL HAVE TWO MAIN OBJECTS:
1. DEFINITION OF THE MOST FAVOURABLE PARAMETERS FOR REINFORCING CHAMOTTE CASTABLES, WHICH ARE E.G. QUANTITY, DIAMETER AND LENGTH OF THE RODLETS AND PARTICULARLY THE RATIO OF RODLET LENGTH TO LINING THICKNESS.
2. IT SHALL BE TESTED WHETHER, BY ADDITION OF HIGH REFRACTORY POWDERY MATERIALS TOGETHER WITH THE USE OF DEFLOCCULANTS AND CHEMICAL BONDING AGENTS FOR PREPARATION OF CERAMIC RODLETS MADE OF FIRECLAY, THE THERMO-MECHANICAL PROPERTIES OF THESE CAN BE IMPROVED AND PARTICULARLY INCREASED SERVICE TEMPERATURES CAN BE ACHIEVED.

THIS WOULD OPEN THE POSSIBILITY TO REINFORCE EVEN HIGH-ALUMINA REFRACTORY PRODUCTS BY CERAMIC RODLETS.

Topic(s)

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Coordinator

Forschungsinstitut der Feuerfest-Industrie
EU contribution
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Address
An der Elisabethkirche 27
53113 Bonn
Germany

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