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CERAMIC/CERAMIC COMPOSITES : PROCESS STUDIES AND CHARACTERIZATION.

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DEVELOPMENT OF NEW CERAMIC/CERAMIC COMPOSITES, ON THE SOL-GEL PROCESS, WITH THE VIEW TO APPLYING SUCH MATERIALS IN AREAS SUCH AS GAS TURBINE ENGINES AND DIESEL MOTORS.

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THE RESEARCH PROJECT WILL COMPLY WITH THE FOLLOWING STEPS:

- A CHOICE WILL BE MADE OF THE MATRIX FROM AMONGST THE REFRACTORY OXIDES SIO2, AL 203, ZRO2, EITHER PURE OR IN COMBINATION WITH EACH OTHER;
- STUDIES WILL BE MADE ON PREPARATION CONDITIONS OF THE CORRESPONDING GELS, AND MEASUREMENTS OF VISCOSITY WILL BE UNDERTAKEN;
- STUDIES OF GEL-FIBRES-INTERACTION DURING THE DRYING AND THE DENSIFICATION PROCESS WILL BE MADE; THE USED FIBRES WILL BE SIC, AL2O3 AND BORON ALUMINO-SILICATE. OBSERVATIONS ON WETTING, FIBRE-MATRIX BONDING, MATRIX SHRINKAGE WILL BE THE MAIN FOCUS OF ATTENTION;
- CHOICE OF MATRIX AS A FUNCTION OF FACTORS SUCH AS POROSITY, MORPHOLOGY, MELTING POINT AND THERMAL EXPANSION COEFFICIENT, WILL BE EVALUATED,
- DEVELOPMENT OF IMPREGNATION AND THERMAL TREATMENT PROCESSES WILL BE STUDIED;
- OPTIMIZATION OF DENSIFICATION CYCLE NUMBER, TO OBTAIN COMPOSITES WITH HIGH MECHANICAL PROPERTIES AND LOW BRITTLENESS;
- CHARACTERIZATION OF THE BEST COMPOSITES AS TO THEIR MECHANICAL CHARACTERIZATION AS A FUNCTION OF TEMPERATURE, THEIR BEHAVIOUR IN AN OXIDIZING ATMOSPHERE AND THEIR THERMAL CHARACTERIZATION AS A FUNCTION OF TEMPERATURE WILL ALSO BE UNDERTAKEN.

THIS PROJECT WILL BE CARRIED OUT WITH THE COLLABORATION OF THE CNRS GLASS LABORATORY OF THE UNIVERSITY OF MONTPELLIER (FRANCE).

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SOCIETE NATIONAL INDUSTRIELLE AEROSPATIALE
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33160 Saint-medard-en-jalles
Frankreich

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