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个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 国际磨粒技术学会（International Committee of Abrasive Technology, ICAT）委员，中国机械工程学会极端制造分会副主任、生产工程分会常务委员、微纳米制造技术分会常务委员，中国机械工程学会生产工程分会磨粒加工技术专业委员会副主任、切削加工专业委员会常委委员、精密工程与微纳技术专业委员会常委委员，中国机械工程学会特种加工分会超声加工技术委员会副主任，中国机械工程学会摩擦学分会微纳制造摩擦学专业委员会常务委员，中国机械工业金属切削刀具协会切削先进制造技术研究会常务理事、对外学术交流工作委员会副主任、切削先进制造技术研究会自动化加工技术与系统委员会副主任。
性别：男
毕业院校：西北工业大学
学位：博士
所在单位：机械工程学院
学科：机械制造及其自动化. 机械电子工程. 航空宇航制造工程
办公地点：机械工程学院7191
电子邮箱：kangrk@dlut.edu.cn
Al2O3-ZrO2 eutectic ceramic via ultrasonic -assisted laser engineered net shaping
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论文类型：期刊论文
发表时间：2017-12-01
发表刊物：CERAMICS INTERNATIONAL
收录刊物：Scopus、SCIE、EI
卷号：43
期号：17
页面范围：15905-15910
ISSN号：0272-8842
关键字：Laser engineered net shaping (LENS); Eutectic ceramic; Ultrasonic-assisted
摘要：Al2O3-ZrO2 eutectic ceramic structures of thin wall and cylinder with average eutectic spacing 60-70 nm were prepared by ultrasonic-assisted laser engineered net shaping (LENS). Effect of ultrasonic power on micro-topography was investigated. X-ray diffractometer analysis and scanning electron microscopy observation were carried out for sample phase composition and micro-topography respectively. The friction and wear properties were tested by microcomputer control universal friction and wear tester. Thermal stability and microhardness were measured by synchronous thermal analyzer and vivtorinox hardness tester respectively, and surface fracture toughness was calculated by indentation crack length. The results show that with the increase of ultrasonic power from 20 to 110 W, micro-topography is cellular eutectic, cellular coexisting with dendritic eutectic, dendritic eutectic, dendritic coexisting with cellular eutectic in turn. Eutectic spacing is 60.29 nm while ultrasonic power is 120 W, grain boundary and colony organization are eliminated completely. When the ultrasonic power changes in 20-160 W, the eutectic spacing shows a tendency to decrease first and then increase. Surface fracture toughness increases to 7.67 +/- 0.2 MPa m(1/2). The reasons for improvement of fracture toughness were analyzed from the aspects of refined eutectic spacing and residual compressive stress. Friction coefficient is small and has no big fluctuation. Wear mechanism exhibits intergranular brittle fracture and exfoliation wear.