Thermal barrier coatings containing aluminosilicate particles
Thermal barrier coatings and substrates, including engine components, coated with the thermal barrier coatings are provided. Also provided are methods for making and applying the thermal barrier coatings. The coatings include aluminosilicate particles dispersed in an organic polysilazane or metal phosphate binder.
1. A thermal barrier coating comprising aluminosilicate microparticles dispersed in an organic polysilazane binder, wherein organic polysilazanes are the only binders present in the coating.
2. The coating of claim 1 , wherein the organic polysilazanes comprise a methyl-substituted organic polysilazane.
3. The coating of claim 1 having the aluminosilicate microparticles content in the range from 10 wt. % to 60 wt. %.
4. The coating of claim 3 having a density of 0.3 gm/cm3 or lower.
5. A coated substrate comprising:
a substrate having a surface; and
a thermal barrier coating on at least a portion of the surface, the thermal barrier coating comprising aluminosilicate microparticles dispersed in an organic polysilazane binder, wherein organic polysilazanes are the only binders present in the coating.
6. The coated substrate of claim 5 , wherein the substrate is an engine component.