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Accueil du site > Divers > equipes de recherche > Matériaux Fonctionnels et de Structure (MFS) > Activités > Frittages non conventionnels >

19 mai 2008

Microwaves system

The microwave processing system configuration, shown below, comprises a microwave generator and a standard R26 rectangular waveguide (a = 86.36 mm and b = 43.18 mm), which is equipped with two circulators and terminated by a symmetric cavity. Two different resonance modes (TE102 which permits an interaction with the magnetic field and TE103 which permits an interaction with the electric field) can be generated..




Few characteristics :

Generator :

Frequency : 2.45 GHz
Power generated : 0 – 2 kW






Circulators :

Phillips D2C located just after the generator absorbs the reflected power from the stub.

Tekelec Airtronic N 00057 placed after the stub absorbs the power reflected by the cavity.





Possibilties :

Texturation of material like (RE)Ba2Cu3O7-d with single domains. The following picture shows taken during the sintering process of a BaTiO3 sample surrounded by a LaCrO3 susceptor.





Nowadays the sintering of advanced materials such as core shell ceramics or nanosize ceramics requires very fast sintering method in order to avoid both grain growth and interdiffusion. In this context, the microwave sintering is a very powerful method since it allows sintering in a very short time (several minutes). The successful microwave sintering of core shell grains, like BaTiO3 grains covered with a nanosize silica layer, undoubtedly illustrates this point.




Contact : Sylvain MARINEL





Spark Plasma Sintering



The point of this sintering is the internal heating source. The sample is located inside a die-electrode system that allows uniaxial pressure and crossed by a pulsed or not electric current. According to the system electric properties, the heating will be broughtby the die or inside the sample itself .





The applied current ( DC or pulsed ), high heating rate and uniaxial pressure allow the synthesis of materials with characteristics (Relative density - Grain size - Vickers hardness - Fracture thoughness) not reached with conventionnal heating source (classical furnace).


Few characterisctics (depends on the nature of material and sample size) :

Termperature : RT-2200 °C

Heating rate : 0-700 °C/min

Applied force : 5-250 kN

Atmosphere : Air / N2 / Ar / vacuum

Sample size (mm) : 8 / 15 / 20 / 30 / 36 / 40 / 50 / 80


Contact : François-Xavier LEFEVRE



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