THERMAL BARRIER COATING HAVING LOW THERMAL CONDUCTIVITY

摘要

A metallic article (1) adapted to be exposed to a gas (6), includes a metallic substrate (2), and a thermal barrier coating (3) on said metallic substrate (2) for restricting heat transfer from said gas (6) to said metallic substrate (2). The thermal barrier coating (3) includes a coating (5) of a ceramic material formed by a deposition of powdered particles (7) of said ceramic material defining a porous microstructure, wherein the porous microstructure has an average pore size 'd', such that d ≤ 0.001. T/P, where d is the average pore size in μm, T is an absolute temperature of the gas (6), and P is a pressure of the gas (6) in atmospheres.