Abstract
Polycrystalline Diamond In article number 2100450, Jianlei Cui and co-workers study the ablation threshold and phase transition of polycrystalline diamond under the irradiation of an ultraviolet nanosecond laser with a wavelength of 355 nm. It reveals that the ablation threshold of polycrystalline diamond is approximately 3.7326 J cm−2. Furthermore, the sp3 structure of the diamond transforms into the sp2 graphite phase during the ultraviolet nanosecond laser micromachining.
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
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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