Scholarlink

<p>Comprehensive mechanical properties, including hardness (<i>H</i>), elasticity modulus (<i>E</i>), fracture toughness (<i>K</i><sub>C</sub>), and wear resistance, are essential for various oxide ceramics based on their demanding working environments. In this work, the nano indentation is used to thoroughly estimate the above properties of RE<sub>3</sub>TaO<sub>7</sub> (RE=La, Sm, Eu, Gd, Dy, Lu), and we identify the best calculation method of <i>K</i><sub>C</sub> for brittle oxide ceramics. It turns out that the length ratio between indentation and cracks (<i>l/α</i>) is a key parameter to choose the calculation method, while the indentation indication energy method is not suitable for brittle oxide ceramics due to the existence of cracks. Furthermore, RE<sub>3</sub>TaO<sub>7</sub> oxides exhibit high <i>H</i> (5.8–14.9 GPa) and <i>E</i> (127.5–247.8 GPa), and their <i>K</i><sub>C</sub> (1.0–2.0 MPa m<sup>1/2</sup>) is higher than those of RE<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> (1.0–1.5 MPa m<sup>1/2</sup>), which are good for their high-temperature applications. This work summarizes accurate calculation methods for mechanical properties based on nano indentation, and they can be used for various oxide ceramics.</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

Comprehensive mechanical properties of oxide ceramics measured by nano indentation: RE3TaO7 (RE=La, Sm, Eu, Gd, Dy, Lu) as a study case

  • 期刊论文

  • 发表日期：

    2026年1月6日

查看全文
  • Chenyu Li,
  • Lin Chen,
  • Guiyu Xue,
  • Jiankun Wang,
  • Baihui Li,
  • Xiang Jiang,
  • Jing Feng

摘要

Comprehensive mechanical properties, including hardness (H), elasticity modulus (E), fracture toughness (KC), and wear resistance, are essential for various oxide ceramics based on their demanding working environments. In this work, the nano indentation is used to thoroughly estimate the above properties of RE3TaO7 (RE=La, Sm, Eu, Gd, Dy, Lu), and we identify the best calculation method of KC for brittle oxide ceramics. It turns out that the length ratio between indentation and cracks (l/α) is a key parameter to choose the calculation method, while the indentation indication energy method is not suitable for brittle oxide ceramics due to the existence of cracks. Furthermore, RE3TaO7 oxides exhibit high H (5.8–14.9 GPa) and E (127.5–247.8 GPa), and their KC (1.0–2.0 MPa m1/2) is higher than those of RE2Zr2O7 (1.0–1.5 MPa m1/2), which are good for their high-temperature applications. This work summarizes accurate calculation methods for mechanical properties based on nano indentation, and they can be used for various oxide ceramics.