Damage of Al2O3 Ceramics under the Action of Pulsed Ion and Plasma Fluxes and Laser Irradiation
Alumina ceramics with corundum structure (α-Аl2О3) manufactured by powder technology method was irradiated by pulsed ion beams and high-temperature plasma in Plasma Focus device and by free running mode laser radiation. Irradiation in the PF-5M device was carried out with nitrogen and air working gases with power flux density for the plasma flow q ≈ 107 W/cm2 and pulse duration τp ≈ 100 ns, and for ion flow q ≈ 108 W/cm2, τi ≈ 20 ns. Exposure with pulsed laser radiation was carried out in air with q ≈ (3 – 5)105 W/cm2 and τ ≈ 0.7 ms. The features of erosion (weight loss) and the damage of the surface layer of ceramics for these modes of exposure were investigated. It has been shown that the joint use of Plasma Focus and pulsed laser exposure is promising for simulation of extreme processes of damage and erosion of materials in thermonuclear fusion reactor (such as ELMs effects in the reactor Iter or at the first wall of the chambers with inertial plasma confinement) in order to study and predict their behavior under these conditions.