A Y₂O₃ network reinforced Ni–Co based superalloy was prepared by ball milling and spark plasma sintering (SPS). Ball milling time and solution treatment temperature were studied to obtain the best microstructure. Optical microscope (OM), scanning electron microscope (SEM) and electron probe micro-analyzer (EPMA) were used to observe the microstructure evolution of as-sintered and solution-treated samples. Hardness also was conducted to analysis the variations of properties with the increase of solution-treatment temperature. The results revealed that the ball milling was beneficial to sintering activity of Ni–Co based superalloy powders. The Y-containing oxides in as-sintered alloys exhibited a network distribution. Master alloy with low C content made the microstructure more uniform during the sintering. After solution treatment at 1250 °C, the precipitations in the Y₂O₃ network reinforced Ni–Co based superalloy with low C content were fine nano tertiary γ′ phase with the size of ~30 nm. In the Vickers hardness test, Y-containing oxides provided additional hardness for the alloy. The appropriate solution treatment temperature and master alloy with low C content were beneficial to obtain better microstructure and properties of the alloy.

AY ₂ O ₃通过球磨和火花等离子体烧结（SPS）制备网络增强的Ni-Co基高温合金。研究了球磨时间和固溶处理温度，以获得最佳的显微组织。用光学显微镜（OM），扫描电子显微镜（SEM）和电子探针显微分析仪（EPMA）观察烧结和固溶处理后样品的微观结构演变。还进行了硬度分析以分析固溶处理温度升高引起的性能变化。结果表明，球磨有利于Ni-Co基高温合金粉末的烧结活性。烧结合金中的含Y氧化物表现出网络分布。碳含量低的中间合金使烧结过程中的组织更加均匀。在1250°C下固溶处理后，低碳含量的₂ O ₃网络增强的Ni-Co基高温合金为纳米级γ'细相，尺寸约为30 nm。在维氏硬度测试中，含Y的氧化物为合金提供了额外的硬度。适当的固溶处理温度和低C含量的中间合金有利于获得更好的合金显微组织和性能。