中国激光, 2020, 47 (6): 0602005, 网络出版: 2020-06-03   

陶瓷激光增材制造等离子体特征与成形缺陷的相关性研究 下载: 991次

Correlation Between Plasma Characteristics and Forming Defects During Laser Additive Manufacturing of Ceramics
刘安丽 1,2隋长有 1,2李发智 1,2张屹 1,2,*
作者单位
1 湖南大学机械与运载工程学院, 湖南 长沙 410082
2 智能激光制造湖南省重点实验室, 湖南 长沙 410082
摘要
光谱强度与电子密度是陶瓷激光增材制造等离子体的两个重要特征。孔隙裂纹缺陷直接影响着陶瓷件的性能。搭建了等离子体监测平台,采用阈值分割法对孔隙缺陷进行提取。通过分析等离子体羽辉和谱线特征来研究工艺参数对等离子体谱线强度和电子密度的影响,得出了等离子体特征与成形缺陷具有相关性这一结论。试验结果表明:与金属材料相比,氧化铝陶瓷蒸气电离形成的等离子体羽辉喷发得更高,面积更大;等离子体谱线强度随激光功率和扫描速度的增大而升高,随送粉速率的增大而降低;电子密度随激光功率、扫描速度和送粉速率的增大而升高;在成形过程中,等离子体谱线强度、电子密度与孔隙、裂纹这两类成形缺陷均具有强相关性。
Abstract
Spectral intensity and electron density are two key features of plasma during the laser additive manufacturing of ceramics. Pore and crack defects significantly affect the performance of ceramic parts. We built a platform for plasma monitoring and extracted the porosity defect through a thresholding method. The effects of the process parameters on the plasma spectrum intensity and electron density were studied by analyzing the plasma plume and spectrum. The relationship between the plasma characteristics and the forming defects was then obtained. The experimental results show that both the ejection height and the plasma plume area formed by the ionization of the alumina ceramics steam were larger than those of metal materials. The plasma spectral intensity increased with the increase in the laser power and scanning speed, but decreased with the increase in the powder flow rate. The electron density increased with the increase in the laser power, scanning speed, and powder flow rate. During the forming process, the plasma spectral intensity and the electron density highly correlated with the pore and crack defects.

刘安丽, 隋长有, 李发智, 张屹. 陶瓷激光增材制造等离子体特征与成形缺陷的相关性研究[J]. 中国激光, 2020, 47(6): 0602005. Liu Anli, Sui Changyou, Li Fazhi, Zhang Yi. Correlation Between Plasma Characteristics and Forming Defects During Laser Additive Manufacturing of Ceramics[J]. Chinese Journal of Lasers, 2020, 47(6): 0602005.

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