Sintered, highly porous body and method for the production thereof

Abstract

The invention relates to a sintered highly porous body comprising at least one layer that is made of a material, which can be sintered and which contains fibers. The aim of the invention is to provide a body of the aforementioned type with improved burn-off properties and values for the flame adherence. To this end, the fibers used are curved on one and/or both sides and they have a principal axis that is shorter than approximately 1 mm and a secondary axis that is shorter than approximately 200 μm, whereby the principal axis is longer than the secondary axis. The invention also relates to a method for producing the sintered porous bodies and to the use thereof.

1 - 28 . (canceled)  
     
     
         29 . A method for producing highly porous bodies with at least one layer made of a sinterable material, comprising fibers, comprising the steps of: 
 cutting fibers to a length of a maximum of approximately 20 mm;    applying a material including the fibers with a pouring volume of approximately 0.2 to 0.4 g/cm 2  after said cutting step; and    sintering the material after said applying step.    
     
     
         30 . The method according to  claim 29 , further comprising the step of compressing the material following the applying step.  
     
     
         31 . The method according to  claim 29 , wherein the applying step includes applying the material onto at least one not sintered layer and subsequently sintering the not sintered layer in the third step.  
     
     
         32 . The method according to  claim 29 , wherein the fibers in the cutting step have hemiellipsoidal cross section on at least one side thereof, which are curved on one side and largely flat on the other side, and having a principal axis that is shorter than 1 mm and a secondary axis that is shorter than 200 μm, whereby the principal axis is longer than the secondary axis.  
     
     
         33 . The method according to  claim 32 , wherein said applying step comprises applying said fibers by scattering.  
     
     
         34 . The method according to  claim 33 , wherein said scattering is effected by impact of directed mechanical oscillations on a heap of fibers while the fibers are filled into a pouring cast.  
     
     
         35 . The method according to  claim 34 , wherein said oscillations of the heap of fibers is effected by an oscillating conveyor transporting fibers from the heap of fibers to the cast.  
     
     
         36 . The method according to  claim 33 , wherein said scattering is effected by agitating a heap of fibers on a sieving surface while the fibers are filled into a pouring cast.  
     
     
         37 . The method according to  claim 33 , wherein during the scattering a pouring cast into which the material is disposed agitates relatively to the material flow.  
     
     
         38 . The method according to  claim 32 , wherein said applying step includes inserting at least one connection element into a cast in which the material is poured.  
     
     
         39 . The method according to  claim 30 , wherein said compressing step includes forming a stable porous green body.  
     
     
         40 . The method according to  claim 31 , wherein the sintering step forms a bond between the layer made of sinterable material and the not-sintered layer.