【摘要】 Si₃N₄陶瓷因具有耐高温、耐腐蚀、耐磨损、高硬度等特点，在高温耐磨损领域的应用备受关注。本文研究了高温下Si₃N₄陶瓷与C/SiC陶瓷或GH214合金摩擦时的平面摩擦磨损性能及磨损机理。结果表明：Si₃N₄陶瓷和C/SiC陶瓷对磨时，随着温度升高，摩擦系数先增大后减小；当温度为1 200℃时，Si₃N₄陶瓷平均摩擦系数低于0.4,且其磨损表面出现磨痕、磨粒和SiO₂氧化膜，磨损形式主要为磨粒磨损和氧化磨损。Si₃N₄陶瓷与GH214合金对磨时，随着温度升高，摩擦系数增大，陶瓷样品表面出现明显的金属氧化物层，其磨损形式主要为粘着磨损和氧化磨损。Si₃N₄陶瓷与两种对磨材料摩擦时，氧化磨损均产生氧化膜并对Si₃N₄陶瓷均有保护和润滑作用，可有效减少Si₃N₄陶瓷基体的磨损，提高Si₃N₄陶瓷的磨损使用寿命。更多还原

【Abstract】 Si₃N₄ ceramics have attracted much attention in the field of high temperature wear resistance because of high temperature resistance, corrosion resistance, wear resistance and hardness. In this paper, the plane friction and wear properties and mechanism of Si₃N₄ ceramics when wearing with C/SiC ceramics or GH214 superalloy at high temperature were investigated. The results show that the friction coefficient of Si₃N₄ ceramics against C/SiC ceramics increases first and then decreases with the increase of temperature. The average friction coefficient of Si₃N₄ ceramics at 1 200 ℃ is lower than 0.4, and wear marks, wear particles and SiO₂ oxide film appear on wear surface. The wear forms are mainly abrasive grain wear and oxidation wear. When Si₃N₄ ceramics and GH214 superalloy are worn against each other, the friction coefficient increases with the increase of temperature. Meanwhile, obvious metal oxide layer is formed on the surface of ceramic samples, so the wear forms are mainly adhesive wear and oxidation wear. During the friction process of Si₃N₄ ceramics and two kinds of friction materials, the oxide film produced by oxidation wear has protective and lubricating effects on Si₃N₄ ceramics, which can effectively reduce the wear of Si₃N₄ ceramics matrix and improve the wear life of Si₃N₄ ceramics.更多还原