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6CCVD Research

Study on Femtosecond Laser Processing Characteristics of Nano-Crystalline CVD Diamond Coating

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2019-10-12
JournalApplied Sciences
AuthorsChao Wei, Yuping Ma, Yuan Han, Yao Zhang, Yang Liu
InstitutionsAnhui Jianzhu University
Citations22

Abstract

Section titled ā€œAbstractā€

Ultra-short pulse laser interaction with diamond materials has attracted extensive interest in micro- and nano-machining, especially for the fabrication of micro tools, because of the straightforward method and high precision. Thanks to the development of chemical vapor deposition (CVD) technology, high-quality CVD diamonds are employed in more varieties of tools as performance-enhancing coatings. The purpose of the experiments reported here was to explore the machinability of CVD diamond coating under the irradiation of femtosecond (fs) pulsed laser. The factor-control approach was adopted to investigate the influence of scanning speed, single pulse energy and repetition rate on the surface quality and carbon phase transition of CVD diamond coating. The material removal rate and surface roughness were evaluated. The interaction mechanism of scanning speed, single pulse energy, and repetition rate were discussed, and the fs laser ablation threshold of CVD diamond coating was calculated. It was demonstrated that two ablation mechanisms (weak and intensive) were in existence as evidenced by the distinct surface morphologies induced under different processing conditions. A strong dependence on the variation of scanning speed and pulse energy is identified in the examination of surface roughness and removal rate. Lorentzian-Gaussian deconvolution of Raman spectra illustrates that fs laser irradiation yields a strong modification effect on the coating and release the compressive stress in it. Furthermore, a newly defined parameter referring to the fs laser energies applied to unit volume was introduced to depict the degree of ablation and the Taguchi method was used to figure out the significance of different parameters. The ablation threshold of CVD diamond coating at the effective pulses of 90 is calculated to be 0.138 J/cm2.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2016 - A study on machining of binder-less polycrystalline diamond by femtosecond pulsed laser for fabrication of micro milling tools [Crossref]
  2. 2016 - Fabrication, polishing and application of diamond coated compacting die with sector-shaped hole
  3. 2014 - Nanocrystalline diamond coatings on the interior of WC-Co dies for drawing carbon steel tubes: Enhancement of tube properties [Crossref]
  4. 2015 - Study of micro/nanostructures formed by a nanosecond laser in gaseous environments for stainless steel surface coloring [Crossref]
  5. 2017 - Surface treatment of CFRP composites using femtosecond laser radiation [Crossref]
  6. 2008 - Control of tribological properties of diamond-like carbon films with femtosecond-laser-induced nanostructuring [Crossref]
  7. 2014 - Fabrication of complex micro/nanopatterns on semiconductors by the multi-beam interference of femtosecond laser [Crossref]
  8. 2016 - Development of an ultrahard nanotwinned cBN micro tool for cutting hardened steel [Crossref]
  9. 2018 - Femtosecond pulsed laser fabrication of a novel SCD grinding tool with positive rake angle [Crossref]

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