US 11,713,280 B2
Method for thermal treatment of a ceramic part by microwaves
Sylvain Marinel, Mathieu (FR); Etienne Savary, Caen (FR); François-Xavier Lefevre, Caen (FR); Jérôme Lecourt, Colleville Montgomery (FR); Sébastien Saunier, Firminy (FR); and Pauline Chanin-Lambert, Saint Just Saint Rambert (FR)
Assigned to CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); UNIVERSITE DE CAEN NORMANDIE, Caen (FR); ECOLE NATIONALE SUPERIEURE D'INGENIEURS CAEN, Caen (FR); UNIVERSITE POLYTECHNIQUE HAUTS-DE-FRANCE, Valenciennes (FR); and ASSOCIATION POUR LA RECHERCHE ET LE DEVELOPPEMENT DE METHODES ET PROCESSUS INDUSTRIELS-ARMINES, Paris (FR)
Appl. No. 16/345,664
Filed by CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR); UNIVERSITE DE CAEN NORMANDIE, Caen (FR); ECOLE NATIONALE SUPERIEURE D'INGENIEURS CAEN, Caen (FR); UNIVERSITÉ POLYTECHNIQUE HAUTS-DE-FRANCE, Valenciennes (FR); and ASSOCIATION POUR LA RECHERCHE ET LE DEVELOPPEMENT DE METHODES ET PROCESSUS INDUSTRIELS-ARMINES, Paris (FR)
PCT Filed Oct. 20, 2017, PCT No. PCT/EP2017/076818
§ 371(c)(1), (2) Date Apr. 26, 2019,
PCT Pub. No. WO2018/077735, PCT Pub. Date May 3, 2018.
Claims priority of application No. 1660496 (FR), filed on Oct. 28, 2016.
Prior Publication US 2019/0284098 A1, Sep. 19, 2019
Int. Cl. C04B 35/64 (2006.01); C04B 35/10 (2006.01); C04B 35/48 (2006.01); H05B 6/64 (2006.01); H05B 6/80 (2006.01)
CPC C04B 35/64 (2013.01) [C04B 35/10 (2013.01); C04B 35/48 (2013.01); H05B 6/6491 (2013.01); H05B 6/80 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/656 (2013.01); C04B 2235/667 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A process for heat treating two solid parts made of ceramic material in a microwave cavity, the microwave cavity being formed by a chamber having a geometry which is suitable for resonance in a single mode of an electromagnetic field defining at least one local extremum of an electric field E or a magnetic field in the microwave cavity, at a frequency vo comprised between 900 MHz and 1 GHz, the direction of the electric field E being substantially uniform in the microwave cavity when it is empty, the process comprising at least the steps of:
a) placing, in the microwave cavity, two solid parts made of ceramic material suitable for absorbing microwaves at the frequency vo and at a temperature T higher than or equal to 700° C., at the at least one local extremum of the electric field E or the magnetic field, the two solid parts being surrounded by at least one first susceptor having first dimensions, wherein the first dimensions, a material of the at least one first susceptor, and an arrangement of the at least one first susceptor are configured so that infrared radiation is emitted directly toward a at least one of the two solid parts during an interaction with the microwaves, the at least one first susceptor comprising at least one first main surface, the at least one first main surface being a ruled surface having generatrices which are parallel to the electric field E in the microwave cavity when it is empty.
b) emitting the microwaves at the frequency vo into the microwave cavity and brazing the two solid parts.