Hole Morphology and Keyhole Evolution during Single Pulse Laser Drilling on Polyether-Ether-Ketone (PEEK)

doi:10.3390/ma15072457

CORC > 力学研究所 > 中国科学院力学研究所 > 宽域飞行工程科学与应用中心

	Hole Morphology and Keyhole Evolution during Single Pulse Laser Drilling on Polyether-Ether-Ketone (PEEK)
	Zhang YM(张艳梅)1,3; Yu G(虞钢)1,2,3; Tian CX(田崇鑫)1,3; Li ZY(李志永)1,3; Shao JY(邵佳昀)1,3; Li SX(李少霞)1,3; He XL(何秀丽)1,3
刊名	MATERIALS
	2022-04-01
卷号	15 期号:7 页码:20
关键词	laser drilling polyether-ether-ketone (PEEK) hole morphology keyhole evolution material-removal mechanism
DOI	10.3390/ma15072457
通讯作者	Li, Shaoxia(lisx@imech.ac.cn) ; He, Xiuli(xlhe@imech.ac.cn)
英文摘要	Polyether-ether-ketone (PEEK), with its superior mechanical, chemical, and thermal properties, as well as high biocompatibility, has been used in aerospace, electronics, and biomedical applications. In this paper, a large number of experiments of single-pulse laser drilling on PEEK were performed to analyze the hole morphology and keyhole evolution, which were characterized by an optical microscope, charge-coupled device (CCD), and high-speed camera. A novel method is proposed to observe and measure the dimension of the processed hole rapidly right after laser drilling for special polymer materials with wear-resistance and non-conductivity. Morphological characteristics of holes are presented to illustrate the effect of pulse width and peak power on hole depth, hole diameter, and aspect-ratio. The obtained maximum drilling depth was 7.06 mm, and the maximum aspect-ratio was 23. In situ observations of the dynamic process of laser drilling, including the keyhole evolution together with ejection and vaporization behavior, were also carried out. The keyhole evolution process can be divided into three stages: rapid increment stage (0-2 ms) at a rate of 2.1 m/s, slow increment stage (2-4 ms) at a rate of 0.3 m/s, and stable stage (>4 ms). Moreover, the variation of dimensionless laser power density with the increase in pulse width was calculated. The calculated maximum drilling depth based on energy balance was compared with the experimental depth. It is proven that the laser-PEEK interaction is mainly influenced by a photothermal effect. Ejection is the dominant material-removal mechanism and contributes to over 60% of the depth increment during the rapid increment stage, while vaporization is dominant and contributes to about 80% of the depth increment during the slow increment stage. The results reveal the material removal mechanism for single-pulse laser drilling on PEEK, which is helpful to understand the dynamic process of keyhole evolution. This not only provides a processing window for future laser drilling of PEEK but also gives a guide for the manufacturing of other polymers.
分类号	二类/Q1
资助项目	National Natural Science Foundation of China[11502269] ; National Natural Science Foundation of China[11672304] ; Plan for Beijing Municipal Commission of Science and Technology[Z181100003818015]
WOS关键词	POLYMERS ; ABLATION ; COMPOSITES ; MACHINABILITY ; PERFORMANCE ; MECHANISMS ; PARAMETERS ; DYNAMICS
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering ; Physics
语种	英语
WOS记录号	WOS:000781973400001
资助机构	National Natural Science Foundation of China ; Plan for Beijing Municipal Commission of Science and Technology
其他责任者	Li, Shaoxia ; He, Xiuli
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88826]
专题	宽域飞行工程科学与应用中心
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China; 3.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Zhang YM,Yu G,Tian CX,et al. Hole Morphology and Keyhole Evolution during Single Pulse Laser Drilling on Polyether-Ether-Ketone (PEEK)[J]. MATERIALS,2022,15(7):20.
APA	张艳梅.,虞钢.,田崇鑫.,李志永.,邵佳昀.,...&何秀丽.(2022).Hole Morphology and Keyhole Evolution during Single Pulse Laser Drilling on Polyether-Ether-Ketone (PEEK).MATERIALS,15(7),20.
MLA	张艳梅,et al."Hole Morphology and Keyhole Evolution during Single Pulse Laser Drilling on Polyether-Ether-Ketone (PEEK)".MATERIALS 15.7(2022):20.