New laser machining technology of Al₂O₃ ceramic with complex shape

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• 作者：Jinlong Yang ; ^{yujuanlli@126.com} ; Juanli Yu ; Yuanyuan Cui ; Yong Huang
• 关键词：Al2O3 ; Gelcasting ; Laser machining ; Green body ; CO2 laser
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3643-3648
• 文件大小：829 K

摘要

A new method was developed for the fabrication of complex-shaped Al₂O₃ ceramic parts by combining laser machining and gelcasting technique. The unwanted ceramic powders parts were selectively removed by laser machining specified by a computer program, and the gelcast Al₂O₃ green bodies were machined to a designed shape by a CO₂ laser at a wavelength of 10.6 渭m. The influences of solid loading, laser output power, scanning speed and nitrogen purge on the machining of green Al₂O₃ ceramic bodies were studied. The experimental parameters were optimized, the green Al₂O₃ bodies with solid loading of 40 vol%or below were easier to be machined, while the green bodies with solid loading of 45 vol%or above were hard to be further machined due to the surface sintering. Better machining quality and deeper machining depth could be obtained when the laser power is 30 W. The green Al₂O₃ bodies with complex shape were obtained by the laser machining.