Deuterium and Helium-Ion Irradiation Effects on TiB sub 2 Coatings

摘要

The surface damage and erosion of chemically vapor deposited TiB sub 2 coatings and commercial grade Ti, caused by 40-, 60- and 120-keV D exp + and exp 4 He exp + irradiation, has been studied for the as deposited coatings and for the coating surfaces that were mechanically polished prior to irradiation. SEM analysis of polished TiB sub 2 samples irradiated with D exp + and exp 4 He exp + to a dose of 3.1 x 10 exp 18 ions/cm exp 2 reveal significant surface damage due to blistering and flaking whereas for identical irradiation conditions, the as deposited TiB sub 2 coatings show very little damage. For similar irradiation conditions the Ti metal samples showed blistering for the exp 4 He exp + irradiation case but no significant surface damage for the D exp + case. Estimates of the irosion yields due to blister exfoliation in polished TiB sub 2 samples show an increase with increasing projectile energy for the total dose studied. (ERA citation 04:047057)