Preparation and Properties of ZrO2/LAS Glass-ceramic Composites
), Ling Bing KONG1()Abstract
Matrix glass of Li2O-Al2O3-SiO2 (LAS) glass ceramics without zirconia was prepared by using melting method with Li2CO3, Al2O3, SiO2 as the main materials. Then, ZrO2/LAS glass-ceramic composites with different contents of ZrO2 were fabricated by using high-energy ball milling, grinding and sintering. Thermal behaviors of the raw materials were examined, while the effects of ZrO2 and sintering temperature on phase composition, macro/microscopic morphology, thermal expansion, bulk density and hardness of the composites were systematically studied. It is found that phase composition of the ZrO2/LAS glass-ceramics composites is mainly dependent on sintering temperature, while the addition of ZrO2 has a strong influence on denseness, thermal expansion and mechanical properties of the composites. The composites with high denseness were achieved as the sintering temperature is 1100 ℃ and the content of ZrO2 is 30 wt.%, while the low linear shrinkage (3.55×10-5) was observed at 800 ℃. When the ZrO2 content was 10–30 wt.%, the average CTEs of the composites at 30–300 ℃were negative and close to zero, which showed the good thermal stability of the composites. The Vickers hardness of the composites increased linearly with the increase of ZrO2 content, indicating that the addition of ZrO2 is beneficial to improve the mechanical properties of the composites. The introduction of ZrO2 into LAS glass could be used as an effective reference for the preparation of glass-ceramic composites with low thermal expansion coefficient and high mechanical properties.
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