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Thermal barrier coatings insulate jet-engine parts.(Surface Engineering)

Advanced Materials & Processes,  August, 2003  

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Thermal barrier coatings (TBC) that have both initial and post-exposure thermal conductivity lower than those of yttria-stabilized zirconia (Zr[O.sub.2] and [Y.sub.2] [O.sub.3]) have been reported by NASA Glenn Research Center, Cleveland, Ohio. The new TBC's are a modified version of yttria-stabilized zirconia, in which other oxides are added to impart lower thermal conductivity.

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Like yttria, the added oxides are regarded as stabilizers. The total stabilizer content ranges between 4 and 50 at.%. They consist of oxides of neodymium, samarium, gadolinium, magnesium, nickel, and ...

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