Thermally-stabilized thermal barrier coating

摘要

A thermal barrier coating (TBC) (26) for a component (10) intended for use in a hostile environment, such as the superalloy turbine, combustor and augmentor components of a gas turbine engine. The TBC (26) is formed to contain small amounts of alumina precipitates (34) dispersed throughout the grain boundaries and pores (32) of the TBC (26) to getter oxide impurities that would otherwise allow or promote grain sintering and coarsening and pore coarsening, the consequence of which would be densification of the TBC (26) and therefore increased thermal conductivity. If sufficiently fine, the precipitates (34) also serve to pin the grains (30) and pore boundaries of the TBC (26), the effect of which is to reduce the tendency for the microstructure of the TBC (26) to sinter, coarsen and undergo pore redistribution, which also increase thermal conductivity of the TBC (26).