Tribological system, method for producing a tribological system and internal combustion engine with a tribological system

Abstract

A tribological system for an internal combustion engine is disclosed. The tribological system includes a valve seat ring having a first contact surface and a valve having a second contact surface that can placed on the first contact surface for closing a valve opening and is arranged in a seat area of the valve. The valve in the seat area has a seat base composed of a high-nickel-content or a nickel-based material, and is coated with a nickel-based plating that comprises nickel as a main component, to form the second contact surface.

1 . A tribological system for an internal combustion engine, comprising:
 a valve seat ring having a first contact surface,   a valve having a second contact surface that can placed on the first contact surface for closing a valve opening and is arranged in a seat area of the valve,   wherein the valve in the seat area has a seat base composed of a high-nickel-content or a nickel-based material, and is coated with a nickel-based plating that comprises nickel as a main component, to form the second contact surface.   
     
     
         2 . The tribological system according to  claim 1 , wherein the nickel-based plating contains more than 30 percent by weight. 
     
     
         3 . The tribological system according to  claim 1 , wherein the nickel-based plating comprises up to 3 percent by weight of carbon as an additional component. 
     
     
         4 . The tribological system according to  claim 1 , wherein the nickel-based plating comprises up to 10 percent by weight of iron as an additional component. 
     
     
         5 . The tribological system according to  claim 1 , wherein the nickel-based plating comprises up to 30 percent by weight of chromium as an additional component. 
     
     
         6 . The tribological system according to  claim 1 , wherein the nickel-based plating comprises up to 9 percent by weight of molybdenum as an additional component. 
     
     
         7 . The tribological system according to  claim 1 , wherein the nickel-based plating consists of the main component and at least one additional component. 
     
     
         8 . The tribological system according to  claim 1 , wherein the seat base of the valve having the high nickel content or the nickel-based material comprises a material having a material number 2.4952. 
     
     
         9 . The tribological system according to  claim 1 , wherein the valve is configured as a poppet valve having a valve disk and a valve stem protruding perpendicularly from the valve disk, wherein the valve disk comprises the seat base and the nickel-based plating with the second contact surface. 
     
     
         10 . The tribological system according to  claim 1 , wherein the valve seat ring is composed of sintered material. 
     
     
         11 . The tribological system according to  claim 10 , wherein the sintered material is a pressed and sintered powder mixture having the following composition:
 5 to 45 percent by weight of one or more iron-based hard phases,   0 to 2 percent by weight of graphite particles, 0 to 2 percent by weight of manganese sulphide, 0 to 2 percent by weight of molybdenum disulphide, 0 to 2 percent by weight of monoiron phosphide powder,   0 to 7 percent by weight of copper powder and 0 to 4 percent by weight of cobalt powder,   0.1 to 1.0 percent by weight of a pressing additive,   a high-speed steel having a composition of 14 to 18 percent by weight of chromium, 1.2 to 1.9 percent by weight of carbon, 0.1 to 0.9 percent by weight of silicon, 0.5 to 2.5 percent by weight of vanadium, 0.5 to 2.5 percent by weight of tungsten, 0.5 to 2.5 percent by weight of molybdenum and   iron as a residue as well as manufacturing impurities of less than 1.5 percent by weight.   
     
     
         12 . The tribological system according to  claim 10 , wherein the sintered materials includes one of:
 one or more iron-based hard phases have a composition of less than 0.2 percent by weight of carbon, 26 to 32 percent by weight of molybdenum, 8 to 12 percent by weight of chromium, 2.2 to 3 percent by weight of silicon, and or that   one or more iron-based hard phases have a composition of less than 0.3 percent by weight of carbon, 26 to 32 percent by weight of molybdenum, 14 to 20 percent by weight of chromium, 2.9 to 4.2 percent by weight of silicon.   
     
     
         13 . The tribological system according to  claim 10  wherein the sintered material includes a cobalt-based hard phase having a fraction of 0.5 to 9.9 percent by weight. 
     
     
         14 . The tribological system according to  claim 10 , wherein the sintered material is a pressed and sintered powder mixture having the following composition:
 one or more cobalt-based hard phases having a composition of less than 0.1 percent by weight of carbon, 26 to 32 percent by weight of molybdenum, 7 to 12 percent by weight of chromium, 2.0 to 4 percent by weight of silicon,   0 to 2 percent by weight of graphite particles, 0 to 2 percent by weight of manganese sulphide, 0 to 2 percent by weight of molybdenum disulphide, 0 to 2 percent by weight of monoiron phosphide powder,   0 to 7 percent by weight of copper and 0 to 4 percent by weight of cobalt powder,   0.1 to 1.0 percent by weight of a pressing additive   a high-speed steel having a composition of 14 to 18 percent by weight of chromium, 1.2 to 1.9 percent by weight of carbon, 0.1 to 0.9 percent by weight of silicon, 0.5 to 2.5 percent by weight of vanadium, 0.5 to 2.5 percent by weight of tungsten, 0.5 to 2.5 percent by weight of molybdenum, and   cobalt as a residue as well as manufacturing impurities of less than 1.5 percent by weight.   
     
     
         15 . The tribological system according to  claim 14 , further comprising one or more cobalt-based hard phases having a composition of less than 0.2 percent by weight of carbon, 18 to 25 percent by weight of molybdenum, 12 to 20 percent by weight of chromium, 1.0 to 3 percent by weight of silicon. 
     
     
         16 . A method for producing a tribological system, comprising:
 providing a valve seat ring having a first contact surface;   providing a valve having a second contact surface arranged in a seat area of the valve that can be placed on the first contact surface for closing a valve opening;   forming a seat base of the valve with a high nickel content a nickel-based material in the seat area to provide the second contact surface and coating the seat base with a nickel-based plating.   
     
     
         17 . An internal combustion engine, comprising:
 a tribological system including:
 a valve seat ring having a first contact surface, 
 a valve having a second contact surface that can placed on the first contact surface for closing a valve opening and is arranged in a seat area of the valve, 
 wherein the valve in the seat area has a seat base composed of a high-nickel-content or a nickel-based material, and is coated with a nickel-based plating that comprises nickel as a main component, to form the second contact surface, and 
   a charge exchange channel that can be closed or released fluidically via the tribological system so that the tribological system together with the charge exchange channel forms a charge exchange member.   
     
     
         18 . The internal combustion engine according to  claim 17 , wherein the nickel-based plating contains at least 50 percent by weight of nickel. 
     
     
         19 . The internal combustion engine according to  claim 18 , wherein the nickel-based plating comprises up to 3 percent by weight of carbon as an additional component. 
     
     
         20 . The internal combustion engine according to  claim 18 , wherein the nickel-based plating comprises up to 10 percent by weight of iron as an additional component.