Currently used coating materials are very brittle, with a toughness only a little more than that of window glass. Also, previous research has shown that it is very difficult to break crystals that are extremely small. A fine-grained microstructure could toughen protective coatings, report researchers.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2016/10/161012122151.htm
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