Which ceramic nanoparticle when used as a thermal barrier coating in pure form can lead to catastrophe?
Which ceramic nanoparticle when used as a thermal barrier coating in pure form can lead to catastrophe? Correct Answer Zirconia
Zirconia manifests 3 crystallographic phases with the increasing temperature at normal atmospheric pressure. The t to m phase transformation in pure Zirconia during cooling is associated with large temperature hysteresis and considerable volumetric change. This leads to catastrophe. Hence, zirconia is frequently added with several dopants (calcia, ceria, magnesia etc.) to stabilize the high temperature t or c phase in the coated microstructure. This prevents the catastrophe.
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Feb 20, 2025