Material Composition for Producing a Coating for a Component made from a Metallic Base Material, and Coated Metallic Component

Abstract

The invention relates to a material composition that is used for producing a coating for a component, especially a turbine component, which is made of a metallic basic material, i.e. a metal or a metal alloy. Said material composition comprises a matrix material for forming a basic coating matrix and at least one filler for adjusting desired coating proportions or coating characteristics. The matrix material can be provided especially with basic glass ceramic properties. The inventive material composition is characterized in that the matrix material and/or the filler contains nanoparticles

1 . A material composition for the production of a coating for a metallic turbine component, comprising:
 a matrix material comprising an inorganic binder forming a base matrix of the coating; and   a filler material comprising metal or metal alloy particles selected to be less noble than the base material to create a sacrificial anode action when in use in a turbine, wherein the matrix material or the filler material comprise nanoparticles with particle sizes of less than 75 nm in a quantity effective to produce a top surface having a degree of smoothness adequate for use in the turbine as a top surface of the component with no overlying top coating,   wherein the coating comprises at least two layers across its depth, the layers containing different nanoscale pigment types to provide a color indication of wear.   
     
     
         2 . The material composition as claimed in  claim 1 , wherein the particle sizes of the nanoparticles are between 20 nm to 50 nm. 
     
     
         3 . The material composition as claimed in  claim 2 , wherein solid constituents of the matrix material are in the form of nanoparticles. 
     
     
         4 . The material composition as claimed in  claim 3 , wherein the nanoparticles comprise at least one of the following materials: Al, CrO 3 , MgO, Al 2 O 3 , and H 3 BO 3 . 
     
     
         5 . The material composition as claimed in  claim 2 , wherein the metal or metal alloy particles comprise at least one of the following metals: Al, Mg, Fe, Ni, Co, Ti, and Zn. 
     
     
         6 . The material composition as claimed in  claim 2 , wherein the metal or metal alloy particles are deactivated. 
     
     
         7 . The material composition as claimed in  claim 8 , wherein the metal or metal alloy particles, for the deactivation, comprises an oxide layer, a phosphate layer or a deactivation layer. 
     
     
         8 . The material composition as claimed in  claim 9 , wherein the filler material comprises hard-material particles as nanoparticles. 
     
     
         9 . The material composition as claimed in  claim 10 , wherein the hard-material particles comprise at least one of the following materials: diamond, silicon carbide, cubic boron nitride, and corundum. 
     
     
         10 . The material composition as claimed in  claim 9 , wherein the filler material comprises thermally stable particles as nanoparticles. 
     
     
         11 . The material composition as claimed in  claim 10 , wherein the thermally stable particles comprise at least one of the following materials: ZrO 2 , SiO 2 , Al 2 O 3 , and (Al x Si y )O z . 
     
     
         12 . The material composition as claimed in  claim 9 , wherein the filler material comprises dry lubricants as nanoparticles. 
     
     
         13 . The material composition as claimed in  claim 12 , wherein the dry lubricants comprise at least one of the following materials: graphite, MoS 2 , WS 2 , and ZrO x N y . 
     
     
         14 . The material composition as claimed in  claim 9 , wherein the filler material comprises colored pigments of at least one pigment type as nanoparticles. 
     
     
         15 . The material composition as claimed in  claim 14 , wherein the filler material comprises a mixture of various pigment types as nanoparticles.