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2023
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03
Diamond-Coated Femtosecond Laser Machining
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Diamond coatings exhibit excellent properties, including high hardness, a low coefficient of friction, superior wear resistance, and outstanding chemical stability. Specimens machined with such coatings possess relatively smooth surfaces and high surface quality.
Diamond-Coated Femtosecond Laser Machining
Diamond coatings exhibit excellent properties, including high hardness, a low coefficient of friction, superior wear resistance, and outstanding chemical stability. Workpieces coated with such materials typically yield surfaces that are relatively smooth and possess high surface quality. However, diamond‑coated surfaces are generally quite rough, with grain sizes usually exceeding 8 μm, which can adversely affect their tribological performance and, to some extent, limit the application of diamond‑coated carbide tools in ultra‑precision machining. Therefore, it is essential to develop a diamond surface coating with a low coefficient of friction.
Because diamond is one of the hardest materials, conventional mechanical polishing cannot achieve the required surface finish for diamond coatings. In such cases, laser polishing proves effective, offering numerous advantages over traditional mechanical methods. Its key benefits include the ability to polish both small, localized areas and large regions within a designated zone. The essence of laser polishing lies in using the laser’s intense, ultra‑short pulse to ablate the sharp edges and corners of diamond particles, thereby attaining the desired surface quality. Femtosecond laser polishing operates on two primary mechanisms: first, avalanche ionization or multiphoton ionization generates free electrons. In regimes where the laser intensity is below 10¹² W/cm², partially ionized electrons gain energy through collisions, producing additional free electrons; at intensities exceeding 10¹² W/cm², electrons bound within atomic fields directly absorb energy and undergo ionization, yielding free electrons. Second, the generated free electrons couple with phonons to heat the crystal lattice; the resulting rapid lattice heating triggers phase‑explosion phenomena, ultimately achieving the desired polishing effect on the diamond coating. All these processes occur within an extremely brief timescale.
Diamond coating
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