Porous machined coatings

Abstract

A method of fabricating a porous machined coating for a ceramic matrix composite, comprising the steps of providing a ceramic matrix composite; optionally depositing on the ceramic matrix composite at least one bond coat; depositing on the at least one optional bond coat at least one ceramic powder to form at least one ceramic coat; and, machining the at least one ceramic coat to form at least one machined ceramic coat, wherein the at least one machined ceramic coat comprises a porosity gradient of approximately 5 percent by volume to approximately 30 percent by volume, the porosity gradient comprising an average fine pore size range of approximately 1 μm to approximately 25 μm, to an average coarse pore size range of approximately 30 μm to approximately 55 μm.

Dependencies are inferred from the claim text.