Spent MoSi₂ heating elements, which worked in the industrial electrical furnace at high temperature, were crushed into powders and reused as coating raw materials. ZrO₂ was added into spent MoSi₂ powders to fabricate MoSi₂-ZrO₂ coatings on niobium by spark plasma sintering, and the microstructure and oxidation behavior of the coatings at 1500 and 1700 °C were explored. The results showed that cracks exist in MoSi₂ coating while ZrO₂-containing coatings are crack-free with the formation of (Mo,Nb)₅Si₃ diffusion layer after SPS, indicating good metallurgical bonding. After oxidation at 1500 °C for 20 h, the lowest mass gain is obtained by MoSi₂-30ZrO₂ coating. SiO₂ and ZrSiO₄ are formed on the composite coatings at elevated temperature, which improves the high-temperature oxidation resistance. After oxidation at 1700 °C for 60 min, the oxide scale of MoSi₂-30ZrO₂ coating is dense without any voids or cracks, demonstrating better high-temperature oxidation resistance than that of single MoSi₂ coating.

将在高温下在工业电炉中工作过的废MoSi ₂加热元件粉碎成粉末，并重新用作涂料原料。将ZrO ₂加入废MoSi ₂粉末中，通过火花等离子体烧结在铌上制备MoSi ₂ -ZrO ₂涂层，并研究了该涂层在1500和1700°C时的微观结构和氧化行为。结果表明，MoSi ₂涂层中存在裂纹，而含ZrO ₂的涂层无裂纹，形成了（Mo，Nb）₅ Si ₃SPS后扩散层，表明良好的冶金结合。在1500°C氧化20 h后，通过MoSi ₂ -30ZrO ₂涂层获得最低的质量增益。在高温下在复合涂层上形成SiO ₂和ZrSiO ₄，提高了高温抗氧化性。在1700°C下氧化60分钟后，MoSi ₂ -30ZrO ₂涂层的氧化皮致密，没有任何空隙或裂纹，显示出比单一MoSi ₂涂层更好的高温抗氧化性。