Laser induced photosynthesis has been employed to produce nanosized aluminium oxide powders. The dependence of the reaction outcomes on the process parameters, in particular on reactant gases (trimethylaluminium TMA and nitrous oxide) relative concentration, has been investigated in several different conditions. The experimental results indicate two main reaction paths. Low TMA relative concentration leads to the formation of nanocrystalline γ-Al₂O₃ with traces of Al₃O₃N compounds. Increasing the TMA concentration the synthesis of aluminium oxicarbide (Al₂OC) is observed. Only the first reaction path is able to produce, after calcining at 1400°C, nanosized α-Al₂O₃ powder. Preliminary attempts in sintering laser produced silicon carbide have shown, that, due to the nanometric dimension of the powder particles, it is possible to retain the β-SiC low temperature phase even for sintering temperature up to 2150 °C. © 1995.

Cited By (since 1996): 7Export Date: 1 September 2010Source: Scopus