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<p>Recent progress in materials science has significantly accelerated the development of alumina-based ceramic composites, enabling their evolution from traditional structural roles to advanced applications across medical, electronic, and nuclear technologies. In this study, three ceramic oxide compositions with the formula (80–<i>x</i>)Al<sub>2</sub>O<sub>3</sub>-<i>x</i>ZrO<sub>2</sub>-5Y<sub>2</sub>O<sub>3</sub>-15CaO, (<i>x</i> = 20, 30, and 40&#xa0;wt.%) were synthesized and designated as AZYC-2, AZYC-3, and AZYC-4, respectively. The powder mixtures were thoroughly homogenized, uniaxially pressed at 250&#xa0;MPa in a steel mold, followed by cold isostatic pressing (CIP), and subsequently sintered at 1200&#xa0;°C for 1&#xa0;h. Comprehensive investigations, including physical, chemical, phase, microstructural, and radiation shielding analyses, were conducted to evaluate the performance of the synthesized composites. Results revealed a progressive increase in density with higher ZrO<sub>2</sub> content, measured at 3.410, 3.470, and 3.610&#xa0;g/cm<sup>3</sup> for AZYC-2, AZYC-3, and AZYC-4, respectively. Morphological analysis indicated a highly crystallized microstructure and dense structure with increasing ZrO<sub>2</sub> concentration. Energy-dispersive X-ray spectroscopy (EDS) confirmed the presence of key elements, including oxygen (O), zirconium (Zr), aluminum (Al), calcium (Ca), and yttrium (Y). Among the composites, AZYC-4 exhibited the highest mass attenuation coefficient (MAC) and linear attenuation coefficient (LAC), with values ranging from 0.028 to 13.841&#xa0;cm<sup>2</sup>/g and 0.1011 to 49.9662&#xa0;cm⁻<sup>1</sup>, respectively. AZYC-2 recorded the highest radiation removal cross-section (Σ<sub><i>R</i></sub>) value of 0.10126&#xa0;cm⁻<sup>1</sup>, compared to 0.09311 and 0.09769&#xa0;cm⁻<sup>1</sup> for AZYC-3 and AZYC-4, respectively. The effective atomic number (Z<sub>eff</sub>) increased with higher ZrO₂ concentration, with ranges of 14.60–21.37 for AZYC-2, 16.07–23.81 for AZYC-3, and 17.61–26.08 for AZYC-4. These results indicate that the synthesized ceramic composites possess excellent radiation attenuation properties, demonstrating competitive performance compared to recently reported shielding materials. Therefore, they are promising candidates for advanced applications in radiation protection.</p>

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Impact of ZrO2 on structure and gamma attenuation characteristics of Al2O3-ZrO2-Y2O3-CaO ceramics system for shielding applications

  • 期刊论文

  • 发表日期：

    2025年10月12日

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  • Z. A. Alrowaili,
  • Nada Alfryyan,
  • S. S. Owoeye,
  • N. Nedelcu,
  • Mine Kırkbınar,
  • A. Alshamari,
  • M. S. Al-Buriahi

摘要

Recent progress in materials science has significantly accelerated the development of alumina-based ceramic composites, enabling their evolution from traditional structural roles to advanced applications across medical, electronic, and nuclear technologies. In this study, three ceramic oxide compositions with the formula (80–x)Al2O3-xZrO2-5Y2O3-15CaO, (x = 20, 30, and 40 wt.%) were synthesized and designated as AZYC-2, AZYC-3, and AZYC-4, respectively. The powder mixtures were thoroughly homogenized, uniaxially pressed at 250 MPa in a steel mold, followed by cold isostatic pressing (CIP), and subsequently sintered at 1200 °C for 1 h. Comprehensive investigations, including physical, chemical, phase, microstructural, and radiation shielding analyses, were conducted to evaluate the performance of the synthesized composites. Results revealed a progressive increase in density with higher ZrO2 content, measured at 3.410, 3.470, and 3.610 g/cm3 for AZYC-2, AZYC-3, and AZYC-4, respectively. Morphological analysis indicated a highly crystallized microstructure and dense structure with increasing ZrO2 concentration. Energy-dispersive X-ray spectroscopy (EDS) confirmed the presence of key elements, including oxygen (O), zirconium (Zr), aluminum (Al), calcium (Ca), and yttrium (Y). Among the composites, AZYC-4 exhibited the highest mass attenuation coefficient (MAC) and linear attenuation coefficient (LAC), with values ranging from 0.028 to 13.841 cm2/g and 0.1011 to 49.9662 cm⁻1, respectively. AZYC-2 recorded the highest radiation removal cross-section (ΣR) value of 0.10126 cm⁻1, compared to 0.09311 and 0.09769 cm⁻1 for AZYC-3 and AZYC-4, respectively. The effective atomic number (Zeff) increased with higher ZrO₂ concentration, with ranges of 14.60–21.37 for AZYC-2, 16.07–23.81 for AZYC-3, and 17.61–26.08 for AZYC-4. These results indicate that the synthesized ceramic composites possess excellent radiation attenuation properties, demonstrating competitive performance compared to recently reported shielding materials. Therefore, they are promising candidates for advanced applications in radiation protection.