摘要
纳秒脉冲激光相对于超短脉冲激光具有较大的熔化面积,所以使用纳秒激光极大地缓解了使用超短脉冲激光连接过程中对脆硬性透明材料/金属材料的间隙限制,为了确定纳秒激光连接脆硬性透明材料/金属的最大允许间隙以及不同间隙条件对连接效果的影响,探究不同界面间隙条件对石英玻璃/铜接头宏观和微观组织以及接头力学性能的影响。研究发现,随着界面间隙的增大接头剪切强度从27 MPa降低至10.5 MPa,界面最大允许间隙约为5μm。石英玻璃/铜连接接头剪切强度数据误差棒较大的原因主要是脆硬性透明材料中常见的本征裂纹包括气孔和夹杂,气孔和夹杂的存在往往导致剪切强度具有离散型和偶然性。此外,发现纳秒激光连接石英玻璃/铜过程中裂纹产生的原因分为两类,一种是冷裂纹中的延迟断裂,另一种是热裂纹,通过调控工艺参数可以避免热裂纹的产生。
Nanosecond pulsed laser has a larger melting area relative to ultrashort pulsed laser,so the use of nanosecond laser greatly alleviates the gap limitation on brittle transparent materials/metal materials during the joining process using ultrashort pulsed laser.In order to determine the maximum allowable gap for nanosecond laser joining of brittle transparent materials/metals and the influence of different gap conditions on the joining effect,this study examines the effects of various interface gap conditions on the macro-and microstructure as well as the mechanical properties of quartz glass/copper joints.It is found that the joint shear strength decreases from 27 MPa to 10.5 MPa with the increase of the interfacial gap,and the maximum permissible interfacial gap is about 5μm.The reason for the large error bars in the shear strength data of quartz glass/copper joints is mainly due to the common intrinsic cracks in brittle and hard transparent materials,which include porosity and inclusion,and the existence of porosity and inclusion often leads to the shear strength of a discrete and accidental nature.In addition,it is found that the causes of cracks during nanosecond laser joining of quartz glass/copper are divided into two categories one is delayed fracture in cold cracking and the other is thermal cracking,which can be avoided by regulating the process parameters.
作者
潘瑞
冯英豪
蒋凡
陈树君
PAN Rui;FENG Yinghao;JIANG Fan;CHEN Shujun(Institute of Mechanical and Energy Engineering,Beijing University of Technology,Beijing 100124)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2024年第22期68-75,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(52275301)
北京市新星计划(20230484311)
北京市自然科学基金(3242002)资助项目。
关键词
界面间隙
纳秒激光连接
脆硬性透明材料
金属
机理分析
interfacial gap
nanosecond laser joining
brittle and hard transparent materials
metals
mechanistic analysis
