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Protecting zirconium dioxide in turbine engines.(COATINGS)

Damage caused by grains of sand entering the turbine engines of aircraft can cause severe damage by corroding the zirconium dioxide (zirconia) thermal-barrier coatings that insulate and protect engine components from high temperatures. To answer this problem, a team of engineers from Ohio State University, USA, is testing a novel formulation of the material.

Due to zirconia's high insulating properties, it has been used for ceramic coatings in turbines for decades. However, operating at elevated temperatures means that sand and other particles drawn into the turbines stick to the ceramic, turn to molten glass, and erode the protective coating, which is about 250 [mu]m.

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