Scholarlink

<p>Al<sub>2</sub>O<sub>3</sub>-GdAlO<sub>3</sub> multiphase (Al<sub>2</sub>O<sub>3</sub>/GAM) ceramics were prepared by reactive pressureless sintering with Al<sub>2</sub>O<sub>3</sub> and Gd<sub>2</sub>O<sub>3</sub> as raw powders at 1450-1600&#xa0;°C with various compositions (Gd<sub>2</sub>O<sub>3</sub> content is 30, 40, 51.5, 60, 65 wt.%, respectively). The effects of sintering temperature and composition on the microstructure, mechanical and thermalphysical properties of Al<sub>2</sub>O<sub>3</sub>/GAM ceramics were investigated systematically. The mechanical properties of Al<sub>2</sub>O<sub>3</sub>/GAM ceramics first increase and then decrease with the increase of Gd<sub>2</sub>O<sub>3</sub> addition. Under the condition of sintering temperature reaching 1550&#xa0;°C, the addition of 51.5 wt.% Gd<sub>2</sub>O<sub>3</sub> exhibited the best comprehensive mechanical properties, specifically manifested as a hardness of 15.7 ± 0.1 GPa, flexural strength of 381 ± 14&#xa0;MPa, and fracture toughness of 3.49 ± 0.10&#xa0;MPa·m<sup>1/2</sup>.As the amount of Gd<sub>2</sub>O<sub>3</sub> added increases, the GdAlO<sub>3</sub> generated has weaker interatomic forces, resulting in a decrease in its elastic modulus and an increase in its thermal expansion coefficient. This research provides a theoretical and experimental basis for the design of neutron absorbing materials.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effects of Sintering Temperature and Composition on the Microstructure and Properties of Al2O3-GdAlO3 Multiphase Ceramics via Reactive Pressureless Sintering

  • 期刊论文

  • 发表日期：

    2025年9月17日

查看全文
  • Yulong Wu,
  • Boxin Wei,
  • Sijia Huo,
  • Lei Chen,
  • Yujin Wang

摘要

Al2O3-GdAlO3 multiphase (Al2O3/GAM) ceramics were prepared by reactive pressureless sintering with Al2O3 and Gd2O3 as raw powders at 1450-1600 °C with various compositions (Gd2O3 content is 30, 40, 51.5, 60, 65 wt.%, respectively). The effects of sintering temperature and composition on the microstructure, mechanical and thermalphysical properties of Al2O3/GAM ceramics were investigated systematically. The mechanical properties of Al2O3/GAM ceramics first increase and then decrease with the increase of Gd2O3 addition. Under the condition of sintering temperature reaching 1550 °C, the addition of 51.5 wt.% Gd2O3 exhibited the best comprehensive mechanical properties, specifically manifested as a hardness of 15.7 ± 0.1 GPa, flexural strength of 381 ± 14 MPa, and fracture toughness of 3.49 ± 0.10 MPa·m1/2.As the amount of Gd2O3 added increases, the GdAlO3 generated has weaker interatomic forces, resulting in a decrease in its elastic modulus and an increase in its thermal expansion coefficient. This research provides a theoretical and experimental basis for the design of neutron absorbing materials.