Growth behaviors of aluminum nitride in steel during laser nitriding: Insights into interfacial energy and segregation throughout its growth habit

Shin, Won-Sang; Park, Changkyoo; Kim, Yoon Jun

doi:10.1016/j.matchar.2021.111625

Cited by 1 publication

(1 citation statement)

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“…Nitriding is a thermochemical treatment method to improve the performances of metals, which has been also used to synthesize metal nitrides . In this method, nitrogen transports through the metals’ surface forming nitride precipitates, such as ferrous nitride, − titanium nitride, , and aluminum nitride (AlN). − Among the metal nitrides, AlN as a ceramic has excellent physical properties including high electrical resistivity (10 13 Ωcm), high thermal conductivity (320 W/m·K), small thermal expansion (4.6 × 10 –6 K –1 ), wide band gap (6.2 eV), low dielectric constant (8.8 at 1 MHz), wear resistance, and excellent chemical stability. − It has been widely used in various fields covering light-emitting diodes, acoustic sensors, solar cells, high-frequency electronic devices, and vibration energy harvesters. − …”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Rapid Nitriding of Aluminum via Pulsed Laser

Ran

Cheng

et al. 2023

Ind. Eng. Chem. Res.

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To better understand the mechanisms of pulsed laser-assisted synthesis of metal nitride, a numerical model was proposed to simulate the process of laser nitriding of aluminum. The model incorporated various multiphysical processes in the laser nitriding process, including heating, melting and vaporization of aluminum, formation of plasma plume, shielding of laser energy, ionization of nitrogen gas, and the transport of nitrogen in the chemically active state N* (N atoms and N+ ions) inside the aluminum. The simulated results are in good agreement with the existing experimental results in terms of laser intensity, laser impulse, N+ lifetime in plume, and nitrogen diffusion depth in aluminum. The model can well simulate the laser shielding process by plume and the nitriding process of aluminum. Characteristics of the plume expansion, plasma formation, nitrogen ionization, and diffusion were investigated systematically by the developed model. Investigations on the effects of key operating conditions show that the impact of laser wavelength is negligible, while the full-width at half-maximum (FWHM), nitrogen gas pressure, and laser intensity have a significant impact on the laser nitriding process of aluminum. The larger FWHM and larger laser intensity yield a layer with a higher N* concentration and greater thickness. The higher nitrogen gas pressure leads to an increase in N* concentration at the same position.

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