Research on ZrO2 thermal barrier coatings modified by high-intensity pulsed ion beam

摘要

We report a modification method for ZFO(2) thermal barrier coatings (TBCs) by high-intensity pulsed ion beam (HIPIB) irradiation. Based on the temporal and spatial distribution models of the ion beam density detected by Faraday cup in the chamber and the ions accelerating voltage, the energy deposition of the beam ions in ZFO(2) is calculated by Monte Carlo method. Taking this time-dependent nonlinear deposited energy as the source term of two-dimensional thermal conduction equation, we obtain the temporal and spatial ablation process of ZFO(2) thermal barrier coatings during a pulse time. The top-layer TBC material in thickness of about 0.2 mu m is ablated by vaporization and the coating in thickness of 1 mu m is melted after one shot at the ion current density of 200A/cm(2). This calculation is in reasonable agreement with those measured by HIPIB irradiation experiments. The melted top coat becoming a dense modification layer clue to HIPIB irradiation seals the gaps among ZFO(2) crystal clusters, and hence barrels the direct tunnel of oxygen.