Product Code: ICAL09_1707

Study on the Characteristics of Debris and Hole Diameter in Laser Drilling of Thick Alumina Ceramics
Authors:
Yinzhou Yan, Institute of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Lingfei Ji, Institute of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Yong Bao, Institute of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Yijian Jiang, Institute of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2009

Characterizations of debris and hole diameter on a 4.4 mm alumina ceramic which was drilled by a slab CO2 laser with various laser-processing parameters were investigated. The main energetic laser parameters, including laser peak power, pulse frequency, duty cycle, and piercing time, were selected as independent variables to be studied. The process performance was evaluated in terms of the characteristics of debris, hole entrance diameter and exit diameter. Based on the experimental results, it was found that laser peak power affected vaporization; duty cycle influenced melt; pulse frequency affected valid heating efficiency in workpieces; and piercing time influenced drilled depth before through-hole was formed. On the process performance (debris, entrance diameter and exit diameter), laser peak power and duty cycle had significant effects, pulse frequency had a lower effect, while piercing time had the lowest effect. Comparatively, peak power had a higher effect than duty cycle on the formation of debris. Furthermore, higher pulse frequency produced more symmetrical and smaller debris when the melt ejected along a particular direction caused by the laser incidence angle was not zero. In addition, a "tiny burst and last pulse" model was established to explain all above results.

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