Addition of rare metal is an interesting way of microstructural controls. Herein, this study employed niobium to tailor the microstructure of gray cast iron, and further to control the tribology properties. Four casting discs with various niobium contents (0~0.31wt.%) were prepared to slide against one certain resin-based friction material. Friction test was performed on a 1:5 scale brake inertia dynamometer under different conditions. Results revealed the significance of niobium concentration on the microstructure by influencing the solidification process. Consequently, a modification to the mechanical and thermal properties was achieved, which was responsible for subsequent tribology behavior. Overall, 0.20wt.% was defined as the optimized formulation of a lower sensitivity to operating conditions, higher brake efficiency, and higher wear resistance.

添加稀有金属是一种有趣的微观结构控制方式。在此，本研究使用铌来调整灰口铸铁的微观结构，并进一步控制摩擦学性能。制备了四个不同铌含量 (0~0.31wt.%) 的铸片，使其与一种特定的树脂基摩擦材料滑动。在1:5比例的制动惯量测功机上进行了不同条件下的摩擦试验。结果通过影响凝固过程揭示了铌浓度对显微组织的重要性。因此，实现了对机械和热性能的修改，这对随后的摩擦学行为负责。总体而言，0.20wt.% 被定义为对操作条件的敏感性较低、制动效率较高、