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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
Formation mechanism and process optimization of nano Al2O3-ZrO2 eutectic ceramic via laser engineered net shaping (LENS)
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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：14742-14747
ISSN号：0272-8842
关键字：Laser engineered net shaping (LENS); Al2O3-ZrO2 eutectic ceramic; Periodic banded structure; Organization coarsening zone; Divorced eutectic zone
摘要：Periodic banded structure has great influence on the microstructure and fracture toughness of eutectic ceramic produced by LENS system. Formation Mechanism of periodic banded structure and influence regularity from laser power, scanning speed, feeding rate and feeding proportion were studied. X-ray diffractometer analysis and scanning electron microscopy observation were carried out for sample phase composition and microstructure respectively. Microhardness was measured by vivtorinox hardness tester, and surface fracture toughness was calculated by indentation crack length. The results show that periodic banded structure is divided into organizational coarsening zone and divorced eutectic zone. Due to the influence of upper cladding layer heat, the eutectic structure in the interlayer bonding zone is obviously coarsening in organization coarsening zone. When laser power is lower, Al2O3 phase takes the lead in nucleation and grows up quickly, forming a discrete block structure of Al2O3 particles in divorced eutectic area. When laser power is higher, ZrO2 phase takes the lead in nucleation and forms a discrete block structure of ZrO2 particles. Al2O3-ZrO2 ceramics with the shape of thin-walled and cylinder were manufactured under the optimized process conditions, whose independent nucleation disappears and the thickness of periodic banded structure reduces to 10 pm. The eutectic spacing of prototype structure reaches 120-130 nm, has uniform microstructure and good surface morphology. The average micro-hardness is 18.59 GPa. Surface fracture toughness increases to 6.52 MPa m(1/2).