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Content archived on 2024-04-15

DEVELOPMENT OF MICROWAVE TECHNIQUES FOR NON DESTRUCTIVE EVALUATION OF ADVANCED CERAMICS

Objective

THE DETECTION OF CRITICAL DEFECTS IN ADVANCED CERAMICS,I.E. DEFECTS WHICH ARE LIKELY TO BRING ON RUPTURE OF PIECES IN SERVICE,IS OF PRIME IMPORTANCE.SOPHISTICATED NON DESTRUCTIVE TESTING METHODS (HIGH FREQUENCIES ULTRASOUNDS,X-RAY,TOMOGRAPHY) ALREADY EXIST,BUT ARE NOT WELL SUITED TO INDUSTRIAL USE BECAUSE OF THEIR PRICE AND OF SOME TECHNICAL REQUIREMENTS (TEST DURATION,COUPLING MEDIUM).AN ALTERNATIVE COULD BE MICROWAVE TECHNIQUES WITH FREQUENCIES HIGHER THAN 25-30 GHZ,PROVIDED THEY ALLOW THE DETECTION OF SMALL DEFECTS (SIZE:SOME MICRONS TO A FEW HUNDRED MICRONS) IN COMPLEX SHAPES.

THE FIRST OBJECTIVE OF THIS PROJECT IS TO ASSESS THE CAPABILITY OF MICROWAVE TECHNIQUES IN TERMS OF SENSITIVITY AND RESOLUTION.THE RANGE OF APPLICATION,I.E. TYPES OF MICROSTRUCTURES WHICH CAN BE EASILY INVESTIGATED BY MICROWAVES MUST BE DEFINED.TO ACHIEVE THIS OBJECTIVE,SOME SAMPLES WILL BE PREPARED USING VARIOUS RAW MATERIALS AND ELABORATION PROCESSES AND FIRST CHARACTERIZED,IN GREEN AND SINTERED STATES,BY MEANS OF CLASSICAL METHODS.

IN A SECOND STAGE,THE DIELECTRIC PROPERTIES OF THE MATERIALS WILL BE DETERMINED.THEREAFTER,THE SAMPLES WILL BE TESTED USING AN EXPERIMENTAL MICROWAVE NDE DEVICE.THE SECOND OBJECTIVE OF THE PROJECT IS TO DESIGN AND BUILD A MICROWAVE DEVICE FOR INDUSTRIAL APPLICATION.


AT THIS TIME,THE STAGE OF THE DIELECTRIC CHARACTERIZATION HAS BEEN ACHIEVED.THE DIELECTRIC CONSTANT AND LOSS TANGENT OF AL2O3,SIO2,SI2N4,SIC,ZRO2 AND OF A FIBROUS MATERIAL HAVE BEEN DETERMINED.THE EXPERIMENTAL MICROWAVE NDE DEVICE HAS BEEN PUT IN SERVICE.

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Topic(s)

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Call for proposal

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Funding Scheme

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CSC - Cost-sharing contracts

Coordinator

Société Française de Céramique (SFC)
EU contribution
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Address
23 rue de Cronstadt
75015 Paris
France

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Total cost

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Participants (4)

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