By means of magnetic pulsed compaction and sintering of weakly aggregated alumina based nanopowders the jet forming nozzle samples for the hydroabrasive cutting were fabricated. The ceramics was obtained from pure alumina, as well as from alumina, doped by , MgO and AlMg. It was shown that the samples sintered from AlMg doped powder have the best mechanical properties and structural characteristics: relative density , channel microhardness. - 18-20 GPa, channel surface roughness , average crystallite size .