Mineral-phase evolution and sintering behavior of MO–SiO₂–Al₂O₃–B₂O₃ (M = Ca, Ba) glass-ceramics by low-temperature liquid-phase sintering

Abstract

In this work, network former SiO₂ and network intermediate Al₂O₃ were introduced into typical low-melting binary compositions CaO·B₂O₃, CaO·₂B₂O₃, and BaO·B₂O₃ via an aqueous solid-state suspension milling route. Accordingly, multiple-phase aluminosilicate glass-ceramics were directly obtained via liquid-phase sintering at temperatures below 950°C. On the basis of liquid-phase sintering theory, mineral-phase evolutions and glass-phase formations were systematically investigated in a wide MO–SiO₂–Al₂O₃–B₂O₃ (M = Ca, Ba) composition range. The results indicate that major mineral phases of the aluminosilicate glass-ceramics are Al₂₀B₄O₃₆, CaAl₂Si₂O₈, and BaAl₂Si₂O₈ and that the glass-ceramic materials are characterized by dense microstructures and excellent dielectric properties.

Keywords

glass-ceramics / liquid-phase sintering / aluminosilicate / mineral phase / microstructures

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