Effect of the synthesis medium on mechanical characteristics of corundum crystals

E.V.Krivonosov, V.S.Konevsky

Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Lenin Ave., Kharkiv 61001, Ukraine

Received November 10, 1998

Effect of the growth and annealing medium redox potential on mechanical characteristics of corundum crystals has been studied. The character of the crystal surface brittle failure under microindentation has been investigated as well as the crystal resistance against shock loading and grinding wear. The part played by activator-vacancy complexes in the crystal mechanical failure has been evaluated. A method has been proposed to improve the wear resistance of doped corundum and leucosapphire single crystals.

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