Patent ID: 7604867

Claim:
An article comprising: a turbine component comprising a metal substrate; and a corrosion resistant coating overlaying the metal substrate and having a layer adjacent thereto, wherein at least the layer of the corrosion resistant coating adjacent to the metal substrate comprises: a glass-forming binder component; and a particulate corrosion resistant component adhered to the glass-forming binder component and comprising corrosion resistant particulates having: a CTE p of at least about 4 and being solid at a temperature of about 1300° F. or greater; and a maximum median particle size defined by one of the following formulas: for a CTE p of 8 or less, M p equal to or less than (4.375×CTE p )−10; and for a CTE p of greater than 8, an M p equal to or less than (−4.375×CTE p )+60; wherein CTE p is the average CTL of the corrosion resistant particulates and wherein M p is the median equivalent spherical diameter (ESD), in microns, of the corrosion resistant particulates; wherein the corrosion resistant coating has a maximum thickness defined by one of the following formulas: for a CTE p of 8 or less, an T c equal to or less than (1.5×CTE p )−3.5; and for a CTE p of greater than 8, an T c equal to or less than (−1.5×CTE p )+20.5; wherein T c is the thickness, in mils, of the corrosion resistant coating.