Abstract
The thermal conditions for obtaining the glass-ceramic material of Al 0.107B 0.374Mg 0.043Zn 0.282Ca 0.100Si 0.927O 3 with a crystalline phase in the form of gahnite (ZnAl 2O 4) were specified. The activation energy E a and the Avrami parameter n for the crystallisation process were determined with the non-isothermal DTA procedure. The maximum temperatures of crystallisation of phases, depending on the rate of heating, ranged between 800–840 °C for willemite and 870–915 °C for gahnite. The homogeneous crystalline spinel phase was obtained by heat treatment above 1000 °C. Precipitation solely of a ghanite phase from glass-ceramic causes a relative increase in its fracture toughness and wear resistance compared to the two-phase materials, i.e., K IC = 2.12–1.65 MPam 1/2 and w s = 0.21 × 10 −4 mm 3/Nm to w s = 1.43 × 10 −4 mm 3/Nm.
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