Product Code: ICA12_P170

Research on Improving of Cut Surface Quality of Laser-Cut Fine Ceramics
Authors:
Lingfei Ji, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Xiaochuan Chen, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Yinzhou Yan, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Yong Bao, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Yijian Jiang, Institute of Laser Engineering, Beijing Univ. of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2012

The influence of laser cutting process on the
microstructure of recast layer and the information of
striation on the cut surface of laser-cut fine ceramics
was researched. On the basis of analysis on the
processing mechanism and numerical simulation, the
optimal cutting parameters for obtaining high quality
specimens are: laser power of 200 W and 6 bar assist
gas pressure for CO2 laser, while 750 W laser power,
1500 cm/min laser scanning speed and 8 bar assist gas
pressure for fibre laser. There are two main research
results were achieved: 1) High cutting quality ceramic
specimen with thin and uniform recast layer and
striation-free cut surface was obtained in free cutting
path. 2) Fibre laser is more suitable for striation-free
laser precision cutting of ceramics. The problem of low
absorption rate with ceramics to fibre laser with the
wavelength around 1.07 μm, i.e. alumina, can be
overcome by phase change of the materials due to laser
rapid heating. The black cutting surface was due to the
mass tetragonal alumina induced by N2 as assist gas.