Investigations on Pulsed Laser Ablation and Incubation Effect in the Composite of Resin and Graphite

doi:10.3901/JME.2022.15.302

Abstract

Abstract: The composite of resin and graphite carries important engineering application and science research value in the hydrogen fuel cells field.Compared with traditional forming and machining methods, pulsed laser processing has extremely good application prospects on the material.However, little attention has been paid to the study of laser processing to the composite of resin and graphite, and the investigation of ablation dynamics to the composite with pulsed laser is greatly significant, which encourages the preparation techniques of micro channels with laser on the graphite bipolar plate.Combining finite element simulation and relevant experiments, the crater diameter changes of the composite ablated by nanosecond pulsed laser are discussed under low fluence conditions ranging from 15.33 J/cm² to 30.35 J/cm², and the ablation thresholds to different number of pulses and incubation effect to the composite are determined.It is found that the ablated crater diameter on the composite rises up to the saturation as the incident fluence and pulse number increase under a pulsed laser with a wavelength of 1 064 nm, which is similar to the metal.The ablation threshold to the composite decreases with increasing the number of pulses, and the changing rate is very obvious before the saturation.Moreover, the incubation factor of the composite is much less than the metal.Based on the results, the micro channels with high aspect ratio are prepared on the graphite composite bipolar plate.

Key words: nanosecond pulsed laser ablation, composite of resin and graphite, incubation effect, fuel cell

CLC Number:

TN249

ZHANG Fulin, HE Jianguo, LIU Yang, DAI Shoujun, XIE Yuying, HUANG Chao, FAN Lianwen, LIU Sisi. Investigations on Pulsed Laser Ablation and Incubation Effect in the Composite of Resin and Graphite[J]. Journal of Mechanical Engineering, 2022, 58(15): 302-312.

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