Refining Disc or Refining Disc Segment

Abstract

The present disclosure provides a refining disc or a segment thereof, comprising a base composed of a cast iron and teeth composed of a metal carbide composite, which teeth protrude from the base, wherein the teeth are partially embedded in the base. A disc refiner comprising a first and a second disc composed of such discs or segments, said first and second discs being arranged such that the teeth of the first disc face the teeth of the second disc as well as a method of disintegrating a material using such as disc refiner are also provided.

1 - 15 . (canceled) 
     
     
         16 . A refining disc or a segment thereof, comprising a base having a cast iron and teeth that protrude from the base, wherein the teeth comprise a metal carbide composite and are partially embedded in the base. 
     
     
         17 . The disc or segment according to  claim 16 , wherein the cast iron is white cast iron or grey cast iron. 
     
     
         18 . The disc or segment according to  claim 16 , wherein the metal carbide composite comprises a metal alloy binder. 
     
     
         19 . The disc or segment according to  claim 18 , wherein the metal alloy binder is Co, Ni or Fe. 
     
     
         20 . The disc or segment according to claim  1 , wherein the metal carbide of the metal carbide composite is WC, TiC and/or TaC. 
     
     
         21 . The disc or segment according to  claim 16 , wherein the metal carbide composite is cemented carbide. 
     
     
         22 . The disc or segment according to  claim 16 , wherein the hardness of the metal carbide material is at least 1000 Vickers. 
     
     
         23 . The disc or segment according to  claim 16 , having the shape of a ring or a ring segment. 
     
     
         24 . The disc or segment according to  claim 16 , having a radially inner edge and a radially outer edge, wherein the teeth arranged closer to the inner edge are bigger than the teeth arranged closer to the outer edge. 
     
     
         25 . The disc or segment according to  claim 16 , wherein a tooth base area of a majority of the teeth is 50-400 mm 2 . 
     
     
         26 . The disc or segment according to  claim 25 , wherein a tooth base area of the majority of the teeth is 75-250 mm 2 . 
     
     
         27 . The disc or segment according to  claim 16 , wherein the tooth height of a majority of the teeth is 5-30 mm. 
     
     
         28 . The disc or segment according to  claim 27 , wherein the tooth height of the majority of the teeth is 10-20 mm. 
     
     
         29 . The disc or segment according to  claim 16 , wherein the teeth are arranged in concentric rows. 
     
     
         30 . A disc refiner comprising:
 a first and second refining disc or a segment thereof, each of the first and second refining disc comprising a base having a cast iron and teeth that protrude from the base, wherein the teeth comprise a metal carbide composite and are partially embedded in the base said first and second discs being arranged such that the teeth of the first disc face the teeth of the second disc.   
     
     
         31 . The disc refiner according to  claim 30 , wherein the second disc is fixed and the first disc is rotatably arranged such that it may rotate in respect of the second disc. 
     
     
         32 . A method of disintegration of a material, wherein a disc refiner according to  claim 30  is used for disintegrating the material. 
     
     
         33 . A method according to  claim 32 , wherein the material comprises cellulose fibers.