Sealing of ceramic substances by means of electromagnetic centimetre waves, and receptacle for carrying out the inventive method

Abstract

A method for manufacturing ceramic parts with a certain porosity by sintering using microwaves, the materials to be sintered being arranged in a vessel, wherein the microwaves introduce sintering energy into the materials to be sintered via electromagnetic waves in the range of vacuum wavelengths between 5 cm-20 cm in multimode having an electromagnetic power of up to one kilowatt, and besides being built from primary materials for the structure of the vessel, the vessel is built from a secondary material which comprises, in particular, a mixture of or mixed crystals of non-metallic, para-, ferro- or antiferromagnetic materials.

1 . Vessel for manufacturing ceramic parts with a certain porosity by sintering using microwaves, said vessel comprising a primary and a secondary material, wherein said secondary material comprises at least one material selected from the group consisting of: a non-metallic material, a para-magnetic material, a ferro-magnetic material and an antiferromagnetic material. 
   
   
       2 . Vessel of  claim 1 , wherein said secondary material is zincochromite (ZnCr2O4) with 0-99 percent by weight of zincite (zinc oxide ZnO). 
   
   
       3 . Vessel of  claim 1 , wherein, to increase the dense sintering temperature, the secondary material further comprises a refractory non-metallic material having a high transparency for super high frequency waves in a wide temperature range. 
   
   
       4 . Vessel of  claim 3 , wherein said refractory non-metallic secondary material having a high transparency for super high frequency waves is zinc oxide (ZnO). 
   
   
       5 . Vessel of  claim 1 , further comprising a receiving portion for receiving said primary and secondary material to be sintered, said secondary material being provided at least partly around the receiving portion. 
   
   
       6 . Vessel of  claim 5 , wherein said receiving portion is surrounded by at least one, secondary material element. 
   
   
       7 . Vessel of  claim 1 , wherein said secondary material is surrounded by said primary material. 
   
   
       8 . Vessel of  claim 5 , wherein said secondary material extends over the entire height of said receiving portion. 
   
   
       9 . Vessel of  claim 6 , wherein said secondary material element is rod-shaped. 
   
   
       10 . Vessel of  claim 6 , wherein said secondary material element is divided regularly around the receiving portion. 
   
   
       11 . Vessel of  claim 6 , wherein said secondary material element is encapsulated with said primary material.