【摘要】 对Si₃N₄陶瓷进行冲蚀磨损和断裂韧性测定,对磨损表面和断口进行扫描电镜观察.结果表明:压痕断裂是热压烧结Si₃N₄产生冲蚀的控制机制;Si₃N₄的冲蚀率Ev与断裂韧性K_IC比有强烈的依赖关系,随K_IC的增高冲蚀抗力迅速增高,即EvOCK_ICⁿ,n值变动于—7.0^—4.4之间;依磨粒硬度H_E和Si₃N₄硬度H的比值和K_IC的大小可以评价Si₃N₄陶瓷的抗冲蚀特性;热压烧结Si₃N₄.有很高的抗冲蚀性能.更多还原

【Abstract】 The erosive wear and fracture toughness of silicon nitride ceramics have been investigated. The main results are as follows:1. The control erosive wear mechanism of hot pressed silicon nitride ceramics is indentation-fracture.2. There are intensive relationship between erosive rate Ev and fracture toughness KIC of silicon nitride ceramics, i, e Ev ∞ KICn, the valur of n changed from -7. 0 to -4. 4.3. The erosion resistance of silicon nitride ceramics can be evaluated by fracture toughness and the ratio of erodent hardness HE and ceramic hardness H.更多还原