Brevet : EP0950341 - FOUR POUR LE TRAITEMENT A HAUTE TEMPERATURE DE MATERIAUX A FAIBLE FACTEUR DE PE...

Titre

FOUR POUR LE TRAITEMENT A HAUTE TEMPERATURE DE MATERIAUX A FAIBLE FACTEUR DE PERTE DIELECTRIQUE

N° et date de publication de la demande

EP0950341 - 20/10/1999

Type de la demande

A1

N° et date de dépôt

EP98904027.4 - 02/01/1998

N° et date de priorité

DE19700141 - 04/01/1997

Famille de brevets

AU6206798A ; ATE230199T1 ; DE19700141A1 ; WO9830068A1 ; US6163020A ; CA2276469A1 ; EP0950341A1

Abrégé

PCT No. PCT/EP98/00003 Sec. 371 Date Aug. 12, 1999 Sec. 102(e) Date Aug. 12, 1999 PCT Filed Jan. 2, 1998 PCT Pub. No. WO98/30068 PCT Pub. Date Jul. 9, 1998In the furnace (10) for the high-temperature processing of materials with a relatively low dielectric loss factor (tan delta ) by heating the material by absorption of microwave energy in a resonant cavity (16), a uniform energy intensity of the microwave field is to be achieved for example by irradiating the microwave energy over a broad band and/or by varying in time the frequency of the irradiated microwave energy. The resonant cavity (16) and the radiation source (13) are tuned to each other such that the relation: (V/ lambda 3). B>/=20 is satisfied. V stands for the volume of the resonant cavity (16), lambda for the wavelength of the microwave radiation and B its band width. V/ lambda 3 equals at least 300 and the clear dimensions 1x, ly and lz of the resonant cavity (16) in the direction of the co-ordinates x, y and z are approximately equal to the cubic root of V. The wall (161 to 166) of the resonant cavity is made of graphite and can be heated by a heating device (28) up to the temperature of the material to be treated. The heating device is arranged outside the resonant cavity, and a heat insulting envelope (38) encloses the unit of resonant cavity (16) and heating device.