摘要
脆性材料的激光弯曲成形是激光快速成形技术的重要应用。本文通过改变激光功率、扫描速度等工艺参数,利用CO2连续激光对氧化铝陶瓷薄片进行了弯曲试验。同时,引入线能量密度来寻求适合弯曲的最佳工艺参数,并结合氧化铝陶瓷的高温性能分析了其激光弯曲特点。试验结果表明：氧化铝陶瓷在温度梯度机制下要实现激光弯曲必须使样品表面达到一定温度以降低其脆性和屈服应力,避免裂纹的产生;采用CO2连续激光可以对氧化铝陶瓷薄片进行弯曲,弯曲角度可达2°;氧化铝陶瓷的激光弯曲过程具有强烈的温度敏感性,当试样表面温度大于临界温度时,弯曲角度迅速增加;适合弯曲的最佳线能量密度为17~24 J/mm。
As an important application of laser rapid forming, the laser bending technology of brittle materials has broad prospects. In this paper,the experiments on bending of Al2O3 ceramic slices with a CO2 CW-laser are carried out at various laser processing parameters, including laser powers and scanning velocities. Laser linear energy density is introduced to explore the best processing parameters for laser bending, and bending characteristics are briefly analyzed according to the high temperature properties of Al2O3 ceramic. Experimental results show that,to realize laser bending for brittle Al2O3 at a temperature gradient, the sample surface must be heated to a specified temperature to ruduce its brittleness and yield stress and to avoid generating cracks. Moreover, the Al2O3 ceramic slice can be bent by the COs CW-laser, and the bending angle can be as high as 2° . Furthermore, the laser ben- ding processing of AlzO° ceramic slice is strongly sensitive to temperature, and there exists a critical temperature, above which, the bending angle increases greatly. The best range of laser linear energy density for bending Al2O3 ceramic is 17-24 J/mm.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2009年第10期2473-2479,共7页
Optics and Precision Engineering
基金
国家教育部博士学科点专项科研基金资助项目(No.20070141002)
辽宁省自然科学基金资助项目(No.20062178)
关键词
激光弯曲
氧化铝陶瓷
温度敏感性
塑性变形
laser bending
Al2O3 ceramic
temperature sensitivity
plastic deformation
