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<p>To break the performance bottleneck of indium oxide (In<sub>2</sub>O<sub>3</sub>) materials and expand their engineering application scenarios in aerospace PEEK modification and anti-adhesion technology, this study adopted a magnesium (Mg) doping strategy. Mg-doped In<sub>2</sub>O<sub>3</sub> bulk materials were prepared via mechanical alloying combined with spark plasma sintering. By integrating first-principles calculations and experimental characterization, the regulatory mechanism of Mg doping on microstructure, electron transport, phonon transport, and mechanical properties was systematically explored. Results show that Mg<sup>2+</sup> (0.072&#xa0;nm) can successfully replace In<sup>3+</sup> (0.080&#xa0;nm) to form a single solid solution, inducing lattice distortion and the introduction of impurity energy levels. Mg doping reconstructs the conduction band bottom and increases the density of states near the Fermi level, synergistically optimizing electrical conductivity and the Seebeck coefficient, improving the power factor by 200% compared with pure samples. Meanwhile, it significantly reduces lattice thermal conductivity by enhancing phonon scattering and decreasing Young’s modulus. When the Mg doping content is <i>x</i>&#xa0;=&#xa0;0.0058, the room-temperature total thermal conductivity decreases to 3.40&#xa0;W/m&#xa0;K, and the ZT value reaches 0.251&#xa0;at <i>x</i>&#xa0;=&#xa0;0.0050. In addition, Mg doping synchronously improves Vickers hardness, realizing synergistic optimization of thermoelectric and mechanical properties. This modified material can be applied in the collaborative scheme of aerospace PEEK modification and anti-adhesion technology to construct an integrated composite system, providing a new path for low-cost large-scale preparation of high-performance oxide thermoelectric materials and energy-efficiency upgrading of high-end rolling and packing equipment, with significant engineering value.</p>

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Indium oxide thermoelectric material empowers aerospace PEEK modification technology: performance upgrade and energy efficiency optimization of rolling and packaging equipment parts

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Yuanyuan Chen,
  • Yameng Tong,
  • Jiangtao Zhang,
  • Bo Feng,
  • Shuo Shi,
  • You Liu,
  • Tongshan Liu,
  • Yue Li,
  • Shengyu Zhou,
  • Tongqiang Xiong,
  • Zhiwen Yang,
  • Haitao Zhang,
  • Wenhua Dai,
  • Suoluoyan Yang,
  • Guopeng Zhou

摘要

To break the performance bottleneck of indium oxide (In2O3) materials and expand their engineering application scenarios in aerospace PEEK modification and anti-adhesion technology, this study adopted a magnesium (Mg) doping strategy. Mg-doped In2O3 bulk materials were prepared via mechanical alloying combined with spark plasma sintering. By integrating first-principles calculations and experimental characterization, the regulatory mechanism of Mg doping on microstructure, electron transport, phonon transport, and mechanical properties was systematically explored. Results show that Mg2+ (0.072 nm) can successfully replace In3+ (0.080 nm) to form a single solid solution, inducing lattice distortion and the introduction of impurity energy levels. Mg doping reconstructs the conduction band bottom and increases the density of states near the Fermi level, synergistically optimizing electrical conductivity and the Seebeck coefficient, improving the power factor by 200% compared with pure samples. Meanwhile, it significantly reduces lattice thermal conductivity by enhancing phonon scattering and decreasing Young’s modulus. When the Mg doping content is x = 0.0058, the room-temperature total thermal conductivity decreases to 3.40 W/m K, and the ZT value reaches 0.251 at x = 0.0050. In addition, Mg doping synchronously improves Vickers hardness, realizing synergistic optimization of thermoelectric and mechanical properties. This modified material can be applied in the collaborative scheme of aerospace PEEK modification and anti-adhesion technology to construct an integrated composite system, providing a new path for low-cost large-scale preparation of high-performance oxide thermoelectric materials and energy-efficiency upgrading of high-end rolling and packing equipment, with significant engineering value.