Abstract
Alumina reduction by laser ablation has been researched toward the lunar resource utilization without reducing agents: especially carbon. Alumina preheating and laser spot size optimization were conducted to increase both the ablation rate and the molar reduction percentage in alumina reduction using laser ablation. A sintered alumina rod was heated to . Then, laser ablation was done using a kilowatt-class continuous wave (CW) laser in ambient argon at 1.0 atm. The ejected ablation plume temperature increased to , which is expected to be the superheating limit temperature of alumina. The molar reduction percentage increased to , which was 2.6 times higher than the percentage obtained without alumina preheating. The ablation rate per unit area increased monotonically with laser intensity and occupancy (the area ratio of the laser spot to an alumina rod). The ablation rate was increased to by laser spot size optimization at a laser intensity of and an occupancy of . In this condition, 75% of the input energy was consumed for alumina reduction.
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