Ablation Threshold Measurement and Chemical Modification of UV Nanosecond Laser Micromachining of Polycrystalline Diamond

Naveed Ullah,Xuyang Fang,Xuesong Mei,Xiangyang Dong,Jianlei Cui,Zheng Sun,Jian Dou

doi:10.1002/pssa.202100450

Naveed Ullah, Xuyang Fang + Show 5 more

Open Access

https://doi.org/10.1002/pssa.202100450

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Abstract

The effects of pulsed laser interaction with matter have become a center for research. The pulsed laser has become an indispensable manufacturing tool in the efficient machining of polycrystalline diamond (PCD) and other materials. Herein, the ablation threshold and chemical modification of PCD irradiated using ultraviolet (UV) nanosecond laser is scrutinized. Using a UV nanosecond laser source, a bulk of PCD is ablated in air, and multipulse processing is executed at a wavelength of 355 nm. The ablation threshold of PCD is reported to be ≈3.7326 J cm−2 based on the linear relationship between the laser pulse energy density and the crater diameter, with a Gaussian distribution of the laser intensity on the cross‐section. Furthermore, the sp3 structure transitioned to the sp2 graphite phase when the PCD is exposed to UV nanosecond laser irradiation. Consequently, this study provides a theoretical and experimental reference for UV nanosecond laser micromachining of PCD materials in the research and metal‐working industries.

Highlights

Diamond is the extremely hardest material with randomly orientated diamond particles in a metal matrix, has record value thermal conductivity at room temperature, high hardness, sound velocity, and carrier mobility[1]
3.1) Mathematical modeling of ablation threshold When the nanosecond laser is used to process the machining of a polycrystalline diamond, only the energy of the light spot is increase to etching of the material, the material will be removed
Threshold theory[16] asserts that the ablation threshold of the pulsed laser has a very small deviation, and the ablation threshold is the lowest laser energy density when the materials can be damaged by the laser[17, 18]

Summary

Introduction

Diamond is the extremely hardest material with randomly orientated diamond particles in a metal matrix, has record value thermal conductivity at room temperature, high hardness, sound velocity, and carrier mobility[1]. It is widely used in aerospace, military, electronics, precision machinery, as a cutting tool material[2] for a variety of industrial applications and other fields. Xing et al.[10] used a nanosecond pulsed laser to process micro-groove on the surface of a polycrystalline diamond They found that the height of the micro-groove increases with increasing laser power and decreasing with scanning speed and repetition rate. J et al.[11] suited, the accuracy of nanosecond laser ablation for general precision machining, and Compared to ultrashort laser ablation, nanosecond laser ablation is more efficient and more suitable for general precision machining processes

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