Coated Metal Substrates That Are Susceptible to Wear, and Method for the Manufacture Thereof

Abstract

The use of tungsten, molybdenum, tungsten or molybdenum alloys for coating metal substrates using a single-wire arc spraying method results in coatings that are characterized in particular by an increased Vickers hardness (VH).

1 .- 7 . (canceled) 
     
     
         8 . A metal substrate whose surface is entirely or partially coated with tungsten, molybdenum, tungsten alloys or molybdenum alloys applied by arc-spraying. 
     
     
         9 . The metal substrate according to  claim 8 , wherein the coated surface is an inner surface of a filling chamber or of a filling chamber insert of a pressure die casting machine. 
     
     
         10 . A pressure die casting machine, comprising the filling chamber or the filling chamber insert according to  claim 9 . 
     
     
         11 . The pressure die casting machine according to  claim 10 , wherein it is an aluminum pressure die casting machine. 
     
     
         12 . A method for coating a surface of a metal substrate, comprising:
 arc-spraying tungsten, molybdenum, a tungsten alloy or a molybdenum alloy onto the surface.   
     
     
         13 . (canceled) 
     
     
         14 . The method according to  claim 12 , wherein the arc spraying is a single-wire method. 
     
     
         15 . The method according to  claim 12 , wherein air is used as the atomizing gas. 
     
     
         16 . The method according to  claim 12 , wherein the tungsten alloy is an alloy containing more than 50% by weight of tungsten. 
     
     
         17 . The method according to  claim 12 , wherein the tungsten alloy is a WNiFe alloy with more than 50% by weight of tungsten or a WMoNiFe alloy in which the sum of the portions of tungsten and molybdenum amounts to more than 50% by weight. 
     
     
         18 . The method according to  claim 12 , wherein the molybdenum alloy is TZM molybdenum, consisting of 0.5% by weight of titanium, 0.08% by weight of zirconium, 0.01% to 0.04% by weight of carbon and the remainder consists of 100% by weight of molybdenum. 
     
     
         19 . The method according to  claim 12 , wherein the metal substrate comprises areas of a metal casting system that are susceptible to wear, or surfaces of forming tools, pistons, camshafts or shunts.