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<p>Owing to its excellent antioxidant properties, B<sub>4</sub>C is commonly used to enhance the mechanical properties and slag corrosion resistance of MgO-C refractories. This study investigated the oxidation process of B<sub>4</sub>C and its effects on the oxidation resistance, mechanical properties, and slag corrosion resistance of MgO-C refractories. The results revealed that at 800 ℃, B<sub>4</sub>C in MgO-C refractories underwent significant oxidation. As the B<sub>4</sub>C content exceeded 2%, the oxidation of MgO-C refractories was effectively suppressed. The adding of B<sub>4</sub>C significantly improved the high-temperature bending strength and Young’s modulus of MgO-C refractories owing to the bulk expansion, pore blockage, and magnesium borate formation during B<sub>4</sub>C oxidation. However, B<sub>4</sub>C had minimal effect on slag corrosion resistance but significantly hindered slag penetration into the refractory interior owing to pore blockage by B<sub>4</sub>C oxidation products.</p>

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Effects of B₄C on oxidation resistance, high-temperature strength, and slag penetration resistance in MgO-C refractories

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Qi Zheng,
  • Lei Yuan

摘要

Owing to its excellent antioxidant properties, B4C is commonly used to enhance the mechanical properties and slag corrosion resistance of MgO-C refractories. This study investigated the oxidation process of B4C and its effects on the oxidation resistance, mechanical properties, and slag corrosion resistance of MgO-C refractories. The results revealed that at 800 ℃, B4C in MgO-C refractories underwent significant oxidation. As the B4C content exceeded 2%, the oxidation of MgO-C refractories was effectively suppressed. The adding of B4C significantly improved the high-temperature bending strength and Young’s modulus of MgO-C refractories owing to the bulk expansion, pore blockage, and magnesium borate formation during B4C oxidation. However, B4C had minimal effect on slag corrosion resistance but significantly hindered slag penetration into the refractory interior owing to pore blockage by B4C oxidation products.