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<p>WC-Co cemented carbide has a wide range of applications in high-precision cutting tools due to its high hardness and strength, excellent fracture toughness, and wear resistance. However, the oxidation behavior of this material in high-temperature environments directly impacts its service life and necessitates further research. In this study, the high-temperature oxidation behavior of WC-6wt.%Co cemented carbide was systematically analyzed at 400&#xa0;°C, 600&#xa0;°C, 800&#xa0;°C, and 1000&#xa0;°C. The results showed that the weight of the samples and the thickness of the oxide layer increased significantly with temperature; the Vickers hardness and flexural strength decreased significantly, whereas the fracture toughness increased slightly. XRD and SEM analyses indicated that the primary oxidation products were WO<sub>3</sub> and CoWO<sub>4</sub>. As the temperature increased and the oxidation time increased, the oxide layer gradually became more porous, with an increased number of cracks, which further accelerated the oxidation process. The experiments also revealed that temperature significantly influenced the oxidation order and product distribution of the Co and WC phases. Finally, schematic diagrams of the samples under different oxidation stages were created.</p>

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Study of the Oxidative Behavior of WC-6wt.%Co Cemented Carbide at Different Temperatures

  • 期刊论文

  • 发表日期：

    2025年4月24日

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  • Ze-yi Hu,
  • Yin-chun Xiao,
  • Cai-he Fan,
  • Rui Zuo,
  • Jiang-xiong Gao,
  • Xiao-liang Lin,
  • Yiling Lu

摘要

WC-Co cemented carbide has a wide range of applications in high-precision cutting tools due to its high hardness and strength, excellent fracture toughness, and wear resistance. However, the oxidation behavior of this material in high-temperature environments directly impacts its service life and necessitates further research. In this study, the high-temperature oxidation behavior of WC-6wt.%Co cemented carbide was systematically analyzed at 400 °C, 600 °C, 800 °C, and 1000 °C. The results showed that the weight of the samples and the thickness of the oxide layer increased significantly with temperature; the Vickers hardness and flexural strength decreased significantly, whereas the fracture toughness increased slightly. XRD and SEM analyses indicated that the primary oxidation products were WO3 and CoWO4. As the temperature increased and the oxidation time increased, the oxide layer gradually became more porous, with an increased number of cracks, which further accelerated the oxidation process. The experiments also revealed that temperature significantly influenced the oxidation order and product distribution of the Co and WC phases. Finally, schematic diagrams of the samples under different oxidation stages were created.