Chromium-free silicate-based ceramic compositions

摘要

A composition based on a certain chromium-free silicate-based binder is described. The one-part slurry composition is an aqueous solution of lithium-doped potassium silicate in combination with an aluminum or aluminum alloy powder. The one-part slurry composition produces a corresponding coating exhibiting improved performance at a reduced coating thickness.

主权项

1. An aqueous slurry composition for the production of a coating on a substrate comprising:
a binder comprising an aqueous solution of lithium doped potassium silicate, the binder characterized by an absence of chromium; and an aluminum or aluminum alloy powder incorporated into the binder, wherein the aluminum or the aluminum alloy powder and the binder are contained as a one-part composition; wherein the aluminum or aluminum alloy powder comprises a particle size distribution characterized in that the 50th percentile of the particle size distribution has a diameter of between about 4 to 7 microns and the 90th percentile of the particle size distribution has a diameter of less than or equal to about 11.5-15.5 microns.