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Investigation of the Mechanical Properties and Machinability of Fluorphlogopite-Gehlenite Glass-Ceramics

B. Eftekhari Yekta, Z. Hamnabard

Journal of Ceramic Science and Technology, Vol. 4, No. 4 (2013), pp. 193-196

DOI: 10.4416/JCST2013-00019

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Abstract

The gradual addition of CaO to a SiO2-Al2O3-B2O3-MgO-K2O-F glass-ceramic composition led to the precipitation of gehlenite crystals and the formation of a potassium-calcium solid solution of fine mica crystals. The above additions almost tripled the bending strength and led to a ∼ 1.5-fold increase in the fracture toughness of the glass-ceramic specimens. When the amount of CaO reached 30 weight parts, the microhardness of glass-ceramic specimens was considerably reduced while their machinability was improved.

Keywords

Mechanical properties, glasses

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