Cast Parts with Enhanced Wear Resistance

Abstract

The invention concerns a cast wear part with its structure reinforced by at least a type metal carbide, and/or metal nitride, and/or boride, and/or metal oxides, and/or intermetallic compounds, referred to below as constituents. The invention is characterized in that the raw materials used as reagents for said constituents have been introduced in a mould ( 1 ) before casting in the form of compacted powder inserts or preforms ( 3 ) or the form of slurries ( 4 ), and the reaction of said powders has been activated in situ by casting a metal, forming a porous conglomerate in situ, and said metal has infiltrated the porous conglomerate, thus forming a reinforced structure leading to inclusion of said constituents in the structure of the metal used for casting, thereby creating a reinforcing structure on the wear part ( 2 ).

1 - 2 . (canceled)  
     
     
         3 . Method for the production of wear parts with a structure reinforced by at least one component selected from the group of metallic carbides, of metallic nitrides, of borides, of metallic oxides, and of intermetallic compounds, wherein: 
 said components are formed by a reaction in situ from raw materials acting as reagents for said components, said reagents being first put into a mould, before casting, in the form of inserts or preformed shapes of compacted powders or in the form of barbitones,    the reaction in situ of said powders is triggered by the casting of a metal,    said reaction in situ forms a porous conglomerate,    said casting metal infiltrates said porous conglomerate resulting in an inclusion of said conglomerate in the structure of the metal used for the casting, thus creating a reinforced structure on the wear part,    said reaction in situ between the raw materials intended to form said components after said reaction is triggered and sustained by the heat of the molten metal.    
     
     
         4 . Method for the production of the wear parts as in  claim 3 , wherein the reaction between the raw materials forms a very porous conglomerate capable of being simultaneously infiltrated by the cast metal without any particular alteration of the reinforced structure.  
     
     
         5 . Method for the production of wear parts as in  claim 3  wherein the reaction between the raw materials takes place at atmospheric pressure without the method requiring any compression after reaction of the powders.  
     
     
         6 . Method for the production of wear parts as in  claim 3 , wherein the reaction between the raw materials does not require any specific gaseous protective atmosphere.  
     
     
         7 . Method for the production of wear parts as in  claim 3 , wherein said raw materials belong to the group of ferrous alloys, preferably FerroTi, FerroCr, FerroNb, FerroW, FerroMo, FerroB, FerroSi, FerroZr and FerroV.  
     
     
         8 . Method for the production of wear parts as in  claim 3 , wherein said raw materials belong to the group of oxides, preferably TiO 2 , FeO, Fe 2 O 3 , SiO 2 , ZrO 2 , CrO 3 , Cr 2 O 3 , B 2 O 3 , MoO 3 , V 2 O 5 , CuO, MgO and NiO.  
     
     
         9 . Method for the production of wear parts as in  claim 3 , wherein said raw materials belong to the group of metals or their alloys, preferably iron, titanium, nickel or aluminum.  
     
     
         10 . Method for the production of wear parts as in  claim 3 , wherein said raw materials include carbon, boron, or nitride compounds.  
     
     
         11 . Use of the wear parts produced according to  claim 3  for applications requiring resistance to both wear and impact.