Method For Producing A Cast Workpiece Having Increased Wear Protection at least in Regions

Abstract

A production of a cast workpiece having increased wear protection in regions, wherein ceramic particles having an average grain size of between 0.2 and 4 mm are mixed with at least one binding agent. Said mixture is applied to a heat-resistant fiber mat at a particular layer thickness, whereby a two-layer structure arises. After hardening of the binding agent, an insert ( 9 ) is constructed from the two-layer structure, the shape thereof corresponding to the shape of a surface region of the cast workpiece to be protected. The insert ( 9 ) is applied in the casting cavity ( 8 ) at the location corresponding to the surface region of the cast workpiece to be protected. The casting cavity ( 8 ) is finally filled with casting material, wherein the ceramic particles in the insert ( 9 ) are embedded in the casting material.

1 . A method for producing a cast workpiece having increased wear resistance at least in regions, in which ceramic-containing material is embedded in a matrix of casting material during casting, the method comprising the steps of:
 a) mixing ceramic particles having an average grain size of between 0.2 and 4 mm with at least one binding agent;   b) applying the mixture of ceramic particles and binding agent in a specific layer thickness to a heat-resistant fibre mat, resulting in a two-layer structure;   c) after hardening of the binding agent, constructing an insert from the two-layer structure, a shape of the insert corresponding to a shape of a surface region, to be protected, of a cast workpiece;   d) attaching the insert in a casting cavity at a location corresponding to the surface region, to be protected, of the cast workpiece; and   e) filling the casting cavity with casting material, the ceramic particles in the insert being embedded in the casting material.   
     
     
         2 . The method according to  claim 1 , wherein an average grain size of the ceramic particles is 1 to 2 mm. 
     
     
         3 . The method according to  claim 1 , wherein zirconium-oxide or aluminium-oxide ceramic is used as the ceramic material. 
     
     
         4 . The method according to  claim 1 , wherein water glass is used as the binding agent. 
     
     
         5 . The method according to  claim 1 , wherein a size maintaining a flexibility of the insert is used as an exclusive or additional binding agent. 
     
     
         6 . The method according to  claim 1 , wherein the casting material is metallic. 
     
     
         7 . The method according to  claim 1 , wherein the casting material is a plastic. 
     
     
         8 . The method according to  claim 1 , wherein the fibre mat is composed of glass fibres. 
     
     
         9 . The method according to  claim 1 , wherein the ceramic-containing layer on the fibre mat has a thickness between 3 and 8 mm. 
     
     
         10 . The method according to  claim 6 , wherein the casting material is steel. 
     
     
         11 . The method according to  claim 6 , wherein the casting material is a nonferrous heavy metal. 
     
     
         12 . The method according to  claim 6 , wherein the casting material is aluminium.