Material Removal Mechanism of Nanotwinned Cubic Boron Nitride by Femtosecond Laser Ablation

doi:10.3901/JME.2019.09.198

Abstract

Abstract: To fabricate the cutting tool of newly developed nanotwinned cubic boron nitride (nt-cBN) bulk applying for ultra-precision cutting, material removal mechanism of femtosecond ablation is studied. Damage threshold and the corresponding threshold power of nt-cBN are calculated by function relationship computation with single point ablation experiment, namely 0.523 J/cm² and 4.1mW. Based on damage threshold, morphology and formation mechanism of ablation areas by multiple laser powers is analyzed, especially of the microstructure on the wall of micro holes. Rapid evaporation, fusion and phrase explosion are three main material removal mechanisms as accelerating laser power when machining nt-cBN surface. Nano humps, explosive cracks and periodicity ripples are found during different machining stages. Microgrooves are etched on nt-cBN surface by line scanning ablation. Dynamic material damage characteristics and removal mechanism in terms of scanning ablation are studied compared with single point ablation. The relation curve graphs between scanning speeds and the length and depth of microgrooves under different laser power are established respectively. The influence of laser power and scanning speed on ablation surface quality is analyzed. Scanning speed of about 0.1mm/s is proved beneficial for both high processing efficiency and well ablation quality.

Key words: damage threshold, femtosecond laser, nanotwinned cubic boron nitride, periodicity micro structure

CLC Number:

TN249

JIN Tianye, CHEN Junyun, WANG Jinhu, ZHAO Qingliang. Material Removal Mechanism of Nanotwinned Cubic Boron Nitride by Femtosecond Laser Ablation[J]. Journal of Mechanical Engineering, 2019, 55(9): 198-205.

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