New experimental data are reported concerning the nitridation of Ti and Zr samples by powerful, multi-pulse TEA CO2 laser irradiation while the samples are under a layer of liquid nitrogen. A comparison with the results obtained with similar irradiations performed in technical nitrogen is given. The results are discussed, with particular reference to how they are affected by the oxidation process, which has an effect because of the oxygen dissolved into the liquid nitrogen.
A model is developed to explain several experimental data previously obtained with laser oxidation of metal samples in air. The main assumption is that the diffusion coefficient of the charged particles changes under the action of laser radiation.
The nitridation of the surface of titanium and zirconium samples was brought about by a powerful, microsecond pulsed TEA CO2 laser irradiation in an atmosphere of technical nitrogen. A breakdown plasma was ignited and developed under the action of every incident laser pulse in the vicinity of the surface of the irradiated samples. There is evidence of strong competition between nitridation and oxidation brought about by the action of the breakdown plasma.
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