微-纳米复合陶瓷超声振动磨削的塑性-脆性转变特征研究  

Brittle-ductile Transition of Micro-nano Composite Ceramics Using Ultrasonic Vibration Grinding

作　　者：吴雁[1] 孙爱国[2] 朱训生[1] 赵波[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030 [2]中北大学机械工程学院,山西太原030051

出　　处：《四川大学学报（工程科学版）》2007年第1期113-117,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(50475060);河南省创新人才基金资助项目(省重大项目0421001200)

摘　　要：基于工件超声振动磨削的单磨粒运动模型,建立超声振动磨削单磨粒最大切削厚度agm ax公式;基于压痕断裂力学,给出硬脆材料超声振动磨削塑性-脆性转变临界条件,进行超声振动磨削与普通磨削对比试验,应用SEM和AFM分析陶瓷磨削表面微观形貌特征,重点研究磨削参数对其塑性-脆性转变特征的影响。研究结果表明,砂轮平均磨粒尺寸是影响塑性-脆性转变最为主要的因素,砂轮速度对其影响次之,磨削深度对塑性-脆性转变的影响最小;得出只有当agm ax小于临界切削深度agc时,才能实现硬脆材料塑性域磨削的重要结论。The motion model of the contact between abrasive particle and workpiece in two-dimension ultrasonic vibration grinding was analyzed, the maximum cutting depth of a grain were obtained. Based on indentation fracture mechanics, the critical condition of ultrasonic vibration grinding brittle-ductile transition was analyzed theoretically. The ultrasonic vi- bration and conventional diamond grinding of A1203 - ZrO2（n） ceramics were performed in order to investigate the effect of ultrasonic vibration grinding conditions on the brittle-ductile transition mechanism, the micro-topngraphy of the grinding surface were observed by AFM and SEM. Experiment results indicated that only when the maximum cutting depth of a grain less than critical depth, ductile regime grinding of ceramics can be realized, the grit size, workpiece velocity and grinding depth can affect the brittle-ductile transition.

关 键 词：超声 振动磨削 微-纳米复合陶瓷 塑性-脆性转变 临界切削深度 

分 类 号：TG580.61[金属学及工艺—金属切削加工及机床]