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<p>This study proposed a novel glass-phase sintering additive composed of ZnO, Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub>, B<sub>2</sub>O<sub>3</sub>, and Co<sub>2</sub>O<sub>3</sub> (ZASBC). Its effects on the structure and properties of Al<sub>2</sub>O<sub>3</sub> ceramics were investigated. XRD results indicated that the addition of ZASBC preserved the original hexagonal crystal system of Al<sub>2</sub>O<sub>3</sub> ceramics while reducing the optimal densification temperature to 1350&#xa0;°C, achieving a bulk density of 3.972&#xa0;g/cm<sup>3</sup>. The dielectric constant (<i>ε</i><sub><i>r</i></sub>) reached 9.79, with its variation primarily attributed to relative density. At 1 wt% ZASBC addition, the quality factor (<i>Q</i> &#xa0;×&#xa0;<i>f</i>) of the sample improved to 131,272 GHz. This enhancement was driven by high packing fraction and relative density. Additionally, the temperature coefficient of resonant frequency (<i>τ</i><sub><i>f</i></sub>) was found to correlate mainly with <i>ε</i><sub><i>r</i></sub>. The Al<sub>2</sub>Oz<sub>3</sub>–1 wt% ZASBC samples sintered at 1400&#xa0;°C demonstrated outstanding microwave dielectric properties.</p>

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Low-temperature sintering of Al2O3 ceramics with high Q × f value

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Jing Yang,
  • Jiaying Dan,
  • Yun Zhang,
  • Shihua Ding

摘要

This study proposed a novel glass-phase sintering additive composed of ZnO, Al2O3, SiO2, B2O3, and Co2O3 (ZASBC). Its effects on the structure and properties of Al2O3 ceramics were investigated. XRD results indicated that the addition of ZASBC preserved the original hexagonal crystal system of Al2O3 ceramics while reducing the optimal densification temperature to 1350 °C, achieving a bulk density of 3.972 g/cm3. The dielectric constant (εr) reached 9.79, with its variation primarily attributed to relative density. At 1 wt% ZASBC addition, the quality factor (Q  × f) of the sample improved to 131,272 GHz. This enhancement was driven by high packing fraction and relative density. Additionally, the temperature coefficient of resonant frequency (τf) was found to correlate mainly with εr. The Al2Oz3–1 wt% ZASBC samples sintered at 1400 °C demonstrated outstanding microwave dielectric properties.