Component for a hot dip coating system and method for the production thereof

Abstract

A component for a hot dip coating system, which comes into direct contact with an immersion bath of liquid metal during operation of the hot dip coating system, having a metallic base body, wherein at least one portion of a surface of the base body is provided with a three-layered coating, which includes a corrosion-resistant bonding layer arranged directly on the surface portion, a barrier layer arranged on the bonding layer, and a ceramic surface layer arranged on the barrier layer.

1 - 12 . (canceled) 
     
     
         13 . A component for a hot-dip coating system, which component comes into direct contact with an immersion bath containing liquid metal during operation of the hot-dip coating system, comprising: a metallic base body; and a three-layer coating on at least a portion of a surface of the base body, the three-layer coating comprising a corrosion-resistant bonding layer arranged directly on the surface of the portion in question, the bonding layer being made at least partially from an iron, nickel, cobalt, or nickel-cobalt base alloy, a barrier layer arranged on the bonding layer, the barrier layer being made at least partially from molybdenum, a molybdenum containing alloy, or molybdenum carbide, and a ceramic surface layer arranged on the barrier layer, the surface layer being made at least partially from an oxide ceramic containing rare earths. 
     
     
         14 . The component according to  claim 13 , wherein the component is a roller for guiding or deflecting a metal strip to be coated as the metal strip is being guided through the immersion bath. 
     
     
         15 . The component according to  claim 14 , wherein the base body comprises a roller portion and two axial bearing journals connected to the roller portion and arranged coaxially to the roller portion, wherein at least parts of surfaces of each of the bearing journals are provided with the three-layer coating, and wherein a lateral surface of the roller portion is provided with a metallic protective layer. 
     
     
         16 . The component according to  claim 14 , wherein the base body comprises a roller portion and two axial bearing journals connected to the roller portion and arranged coaxially to the roller portion, wherein a metal bushing is installed on each of the bearing journals. 
     
     
         17 . A method for producing a component for a hot-dip coating system, which component comes into direct contact with an immersion bath containing liquid metal during operation of the hot-dip coating system, the method comprising the steps of:
 providing a metallic base body;   applying a corrosion-resistant bonding layer made at least partially from an iron, nickel, cobalt, or nickel-cobalt base alloy to at least part of a surface of the base body;   applying a barrier layer made at least partially from molybdenum, a molybdenum containing alloy, or molybdenum carbide to the bonding layer; and   applying a ceramic surface layer made at least partially from an oxide ceramic containing rare earths to the barrier layer, the layers forming a three-layer coating.   
     
     
         18 . The method according to  claim 17 , wherein the bonding layer and the barrier layer are each applied by thermal or kinetic spraying. 
     
     
         19 . The method according to  claim 17 , wherein the surface layer is applied by thermal spraying. 
     
     
         20 . The method according to  claim 17 , wherein the base body has a roller portion and two axial bearing journals connected to the roller portion and arranged coaxially to the roller portion, the three-layer coating being applied to at least parts of surfaces of each of the bearing journals, the method further including applying a metallic protective layer to a lateral surface of the roller section. 
     
     
         21 . The method according to  claim 17 , wherein the base body has a roller portion and two axial bearing journals connected to the roller portion and arranged coaxially to the roller portion, the method further including installing a metal bushing on each of the bearing journals.