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<p>This research investigates the influence of adding CaF₂ to pre-sintered frits on the sintering behaviour, crystallization processes, viscous flow characteristics, and physicochemical properties of CaO-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> (CAS) glass-ceramics. Glass-ceramic samples were prepared by mixing pre-sintered frits with varying concentrations of CaF₂. Differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and hot stage microscopy (HSM), were employed to assess microstructure, crystalline phases, and sintering performance. Properties such as density, water absorption, hardness, compressive strength, and corrosion resistance were also evaluated. The results showed that adding CaF₂ enhances sintering efficiency and densification at lower temperatures, with 2 wt% CaF₂ providing the best balance of properties. However, excessive CaF₂ led to reduced mechanical strength and structural flaws due to excessive glass-phase formation. These findings accentuate the critical role of CaF₂ in modifying glass-ceramic properties and provide valuable guidance for designing materials with specific performance characteristics.</p>

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Role of CaF2 addition to Frits in controlling sintering, microstructure, and properties of CaO-Al2O3-SiO2 glass-ceramics

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Majid Bagheri,
  • Mostafa Karamouz

摘要

This research investigates the influence of adding CaF₂ to pre-sintered frits on the sintering behaviour, crystallization processes, viscous flow characteristics, and physicochemical properties of CaO-Al2O3-SiO2 (CAS) glass-ceramics. Glass-ceramic samples were prepared by mixing pre-sintered frits with varying concentrations of CaF₂. Differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and hot stage microscopy (HSM), were employed to assess microstructure, crystalline phases, and sintering performance. Properties such as density, water absorption, hardness, compressive strength, and corrosion resistance were also evaluated. The results showed that adding CaF₂ enhances sintering efficiency and densification at lower temperatures, with 2 wt% CaF₂ providing the best balance of properties. However, excessive CaF₂ led to reduced mechanical strength and structural flaws due to excessive glass-phase formation. These findings accentuate the critical role of CaF₂ in modifying glass-ceramic properties and provide valuable guidance for designing materials with specific performance characteristics.