Process for Producing Capacitors

Abstract

The invention relates to a process for producing capacitors based on niobium suboxide, and having an insulator layer of niobium pentoxide. Also described is a powder mixture suitable for production of capacitors. Pressed bodies produced from the powder mixture, and capacitors having specific properties are also disclosed.

1 - 14 . (canceled) 
     
     
         15 . A powder for the production of anode structures for solid electrolyte capacitors, comprising tertiary agglomerate particles, the tertiary particles being agglomerates of:
 (i) a first member selected from the group consisting of primary particles of niobium suboxide, secondary particles of niobium suboxide and combinations thereof; and   (ii) a second member selected from the group consisting of primary particles of niobium metal, secondary particles of niobium metal and combinations thereof   
     
     
         16 . A powder mixture, optionally comprising powder agglomerates, having a mean composition of the following formula,
   NbO x      wherein 0.7<x<1.3, which after being pressed to a green density of 2.8 g/cm 3  has a compressive strength of over 2 kg.   
     
     
         17 . A pressed body comprising the powder mixture of  claim 15  that has been pressed to a density of from 2.3 to 3.7 g/ cm 3 . 
     
     
         18 . A pressed body comprising the powder mixture of  claim 16  that has been pressed to a density of from 2.3 to 3.7 g/ cm 3 . 
     
     
         19 . A solid electrolyte capacitor anode comprising a sponge-like sintered structure, the sintered structure having regions which comprise niobium metal, and having regions which comprise niobium suboxide represented by the following formula,
   NbO x      wherein 0.7<x<1.3.   
     
     
         20 . A solid electrolyte capacitor anode having a mean composition of formula
   NbO x      
       wherein 0.7<x<1.3, and having a wire detachment strength under tension of over 2.0 kg. 
     
     
         21 . A solid electrolyte capacitor anode having a mean composition of formula NbO x , wherein 0.7<x<1.3, and having a compressive strength of over 10 kg. 
     
     
         22 . A solid electrolyte capacitor comprising the anode of  claim 19 . 
     
     
         23 . A solid electrolyte capacitor comprising the anode of  claim 20 . 
     
     
         24 . A solid electrolyte capacitor comprising the anode of  claim 21 .