Degradation of TiAlN coatings by the accelerated life test using pulsed laser ablation

Comparison of picosecond and nanosecond lasers for the synthesis of TiN sub-micrometer spherical particles by pulsed laser melting in liquid

“…Thermal diffusion length in TiN particles during pulsed laser heating calculated by Eq. (1) based on the physical properties of TiN 25) in As shown experimentally and theoretically, the particle heating−cooling model developed by our group can be applied to calculate the particle temperature during pulsed laser irradiation. 17) Particles are heated via laser absorption depending on the time profile of laser pulse.…”

Thermal shock behaviors of TiN coatings on Inconel 617 and Silicon wafer substrates with finite element analysis method

“…The ablation diameter was 200 µm, and the number of pulses was increased from 1 to 20 times with an energy output of about 13 J/cm 2 at a 100 % output level with a wavelength of 213 nm. Laser irradiance was ~2 GW/cm 2 with a pulse width of ~5 ns, and the number of laser ablation pulses was increased with a frequency of 1 Hz [12,13,19]. As a result of our previous finite element method, maximum temperature on the TiN coating surface was about 14,000 K with Gaussian distribution.…”

“…The specimens were modeled to quarter cylinders and matched the size of the experimental specimens [21,22] and the maximum temperature and principal stress were calculated during the short ablation times (5 ns). Table 1 shows the major physical properties of the coating and the substrates in the FEA model [19,23]. The 1 st order 8-noded thermally coupled brick element (tri-linear displacement and temperature system, C3D8T) was used in the modeling, and total nodes were 26,578 (total elements: 23,564, thermal gap conductance: 50,000 W/ µm · o C for 0.1 mm).…”

“…Finite element analysis (FEA) method has been considered as a useful tool for expecting the change of temperature and stress by thermal and/or mechanical loads since the accurate measurement of the temperature and load in the cutting zone is difficult [14][15][16]. FEA can also be used to determine the stress and temperature distributions in laser-ablated spots [17][18][19].…”

Bias voltage influence on the mechanical and tribological properties of titaniumaluminum nitride coatings produced by triode magnetron sputtering

“…Additionally, among other characteristics, denser films for lower substrate temperatures and a compact film structure for temperatures of approximately 300 °C were observed. Although TiAlN films have been produced by several techniques, such as cathodic pulsed arc [6], magnetron sputtering [7] and laser ablation [8], no works on the growth of TiAlN by TMS have been reported in the literature. However, it is well known that the physical and chemical properties of films that are grown by magnetron sputtering depend strongly on the processing parameters, such as the pressure, temperature and bias voltage.…”