Abstract
In situ developments of platelike spodumene–diopside grains were obtained by controlled devitrification of the complex system Li2O–CaO–MgO–Al2O3–SiO2 glass. The crystallization mechanisms of spodumene–diopside glass were measured by isothermal and non-isothermal processes using classical and differential thermal analysis techniques. The Avrami constant n was 2.0–2.1, indicating two-dimensional crystal growth and platelike grains. The crystalline phases precipitated first were high-quartzs.s., then transformed to β-spodumene and diopside. The Flexural strength, fracture toughness and thermal shock resistance (in 20°C water) increased from 145 MPa, 1.3 MPa m1/2, 800°C (pure spodumene) to 197 MPa, 2.9 MPa m1/2 and 920°C (spodumene–diopside) with low thermal expansion coefficient (from 3∼9·10–7 to 11.8·10–7 K–1). This mean in situ developments of platelike spodumene–diopside grains reinforced the low thermal expansion coefficient glass-ceramics.
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Anmin, H., Ming, L. & Dali, M. Phase transformation in spodumene–diopside glass. J Therm Anal Calorim 84, 497–501 (2006). https://doi.org/10.1007/s10973-005-6941-z
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DOI: https://doi.org/10.1007/s10973-005-6941-z