NANOCRYSTALLINE sintered body based on the alpha-aluminum oxide, processes for their manufacture, and application

摘要

FIELD: metallurgy.;SUBSTANCE: sintered body contains 95-100 wt % of Al₂O₃, has relative density ≥97%, Vickers hardness HV_0.2≥17.2 GPa and crystal structure with average dimension of primary crystals Al₂O₃ 100 nm. A sintered body is fabricated by compacting nano-crystal powder α-Al₂O₃ with average diametre of particles ≤100 nm produced out of base aluminium tri-chloride with chemical formula Al₂(OH)_nCl_z, also n is a number between 2.5 and 5.5, z is number between 3.5 and 0.5, and sum n+z is constantly equal to 6, producing compaction of ≥60% density and sintering at 1200-1500°C.;EFFECT: produced abrasive grains facilitate increased efficiency of grinding.;30 cl, 3 dwg, 2 tbl, 6 ex