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<p>This study fabricated porous tungsten discs using 5&#xa0;μm tungsten powder via powder metallurgy. The microstructure, sintering shrinkage, porosity, pore size, ethanol flux, and impurity content of the discs sintered at various temperatures were characterized, along with the filtration efficiency of the sample sintered at 2200°C. The sintering kinetics were investigated in detail. The results indicate that grain boundary diffusion serves as the predominant mechanism for sintering shrinkage under the experimental conditions, with an activation energy of 383.37&#xa0;kJ/mol. As the sintering temperature increases, the shrinkage progressively intensifies, with axial shrinkage being slightly lower than radial shrinkage. Porosity declines gradually, with the rate of decrease accelerating markedly at 2200°C. Both the maximum pore size and ethanol flux demonstrate a decreasing trend, whereas the average pore size initially decreases and then increases slightly. The impurity content in the porous tungsten discs remains &lt; 50&#xa0;ppm and does not exceed that of the raw tungsten powder. Notably, the sample sintered at 2200°C demonstrates exceptionally high filtration efficiency for particles &gt; 0.5&#xa0;μm, making it suitable for the purification of gases and liquids in high-pressure, high-temperature, impurity-sensitive applications.</p>

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The Influence of Sintering Temperature on the Properties of Porous Tungsten

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Jing Zhang,
  • Guan-Mei Zhang,
  • Ke-Ke Tian,
  • Ao-Ran Sun,
  • Chong Gao,
  • Xin Wang,
  • Gao-Jian Liu,
  • Lai-Ping Li

摘要

This study fabricated porous tungsten discs using 5 μm tungsten powder via powder metallurgy. The microstructure, sintering shrinkage, porosity, pore size, ethanol flux, and impurity content of the discs sintered at various temperatures were characterized, along with the filtration efficiency of the sample sintered at 2200°C. The sintering kinetics were investigated in detail. The results indicate that grain boundary diffusion serves as the predominant mechanism for sintering shrinkage under the experimental conditions, with an activation energy of 383.37 kJ/mol. As the sintering temperature increases, the shrinkage progressively intensifies, with axial shrinkage being slightly lower than radial shrinkage. Porosity declines gradually, with the rate of decrease accelerating markedly at 2200°C. Both the maximum pore size and ethanol flux demonstrate a decreasing trend, whereas the average pore size initially decreases and then increases slightly. The impurity content in the porous tungsten discs remains < 50 ppm and does not exceed that of the raw tungsten powder. Notably, the sample sintered at 2200°C demonstrates exceptionally high filtration efficiency for particles > 0.5 μm, making it suitable for the purification of gases and liquids in high-pressure, high-temperature, impurity-sensitive applications.