Abstract
Ion irradiation of TiC coatings prepared by diffusion annealing was performed with 20–40 keV He+ ions for different doses at room temperature. The polished TiC0.99 coatings irradiated with 40 keV He+ ions showed the surface damage and erosion due to blistering and exfoliation above a dose of 1.8 × 1017 ions/cm2, whereas no change in the surface mophology could be detected for the as-prepared coatings up to a dose of 1.4 × 1018 ions/cm2. The results suggested that surface erosion due to blistering can be effectively reduced on the rough surface of the as-prepared TiC coating. The average blister diameter in the polished TiC0.99 coating increased with increasing projectile energy. For the 40 keV He+ ion irradiation of the polished TiC0.5 coatings, general features in blisters were similar to those observed for the TiC0.99 coatings, but the critical dose for blistering shifted to a higher value in comparison with the polished TiC0.99 coating. Thermal cycling between 500 and 1200°C caused serious surface damage for the TiC0.99 coating irradiated with 40 keV He+ ions below the critical dose for blistering, while the coating with surface damage due to blistering showed no significant change in the surface topography after thermal cycling.
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