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<p>Chromium-based high-temperature alloys are promising candidates for next-generation high-temperature applications due to their high melting point and exceptional oxidation resistance. This study systematically investigates how different characteristics of chromium (Cr) powder, produced by either mechanical breaking (MB) or the plasma rotating electrode process (PREP), influence the fabrication and properties of powder metallurgy Cr-based materials. The results showed that PREP powders exhibit superior purity, spherical compared to MB powders. Consequently, the PREP powder compacts achieved higher green body density, increasing from 6.52 to 6.70&#xa0;g/cm<sup>3</sup>. After sintering, the density further increased from 6.83 to 6.96&#xa0;g/cm<sup>3</sup>, corresponding to an improvement in relative density from 95.52 to 96.81%. Furthermore, the PREP specimens demonstrated enhanced flexural strength with an increase about 55&#xa0;MPa, superior high-temperature oxidation resistance with a reduction in mass gain by 41.09% and oxide layer thickness by 50% after 300-hour oxidation in air under 800 °C, and improved electrical properties with a 35.06% decrease in area-specific resistance.</p>

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Effects of Different Powders and Sintering Temperatures on the Preparation and Properties of Powder Metallurgy Chromium-Based Materials

  • 期刊论文

  • 发表日期：

    2026年2月7日

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  • Shuangfei Yan,
  • Nian Hong,
  • Yi Cai,
  • Xinyu Liu,
  • Luyuan Huang,
  • Rongsheng Wang,
  • Jingguang Peng

摘要

Chromium-based high-temperature alloys are promising candidates for next-generation high-temperature applications due to their high melting point and exceptional oxidation resistance. This study systematically investigates how different characteristics of chromium (Cr) powder, produced by either mechanical breaking (MB) or the plasma rotating electrode process (PREP), influence the fabrication and properties of powder metallurgy Cr-based materials. The results showed that PREP powders exhibit superior purity, spherical compared to MB powders. Consequently, the PREP powder compacts achieved higher green body density, increasing from 6.52 to 6.70 g/cm3. After sintering, the density further increased from 6.83 to 6.96 g/cm3, corresponding to an improvement in relative density from 95.52 to 96.81%. Furthermore, the PREP specimens demonstrated enhanced flexural strength with an increase about 55 MPa, superior high-temperature oxidation resistance with a reduction in mass gain by 41.09% and oxide layer thickness by 50% after 300-hour oxidation in air under 800 °C, and improved electrical properties with a 35.06% decrease in area-specific resistance.