| 摘要 |
PURPOSE:To obtain the titled particles having excellent dispersibility, fluidity and packing property and free from aggregation and fusion of particles, by blasting and burning a raw material alloy powder corresponding to a specific compositional ratio through a burner nozzle in an atmosphere containing O2 gas. CONSTITUTION:A powdery alloy 1 having particle diameter of <=200mu and a composition corresponding to the compositional ratio of the metal of the objective compound metal oxide is supplied at a constant rate with a feeder 2 and blasted into a reaction chamber 6 through a burner nozzle 3 by the aid of gas introduced from an inlet port 4 for alloy powder ejection gas. Separately, O2 gas is introduced into the reaction chamber 6 through an O2-introduction port 5 and the powder is heated with an electric furnace 7 to effect the ignition and combustion. When the combustion reaches stable state, the heating with the furnace 7 is stopped and the reaction is continued by the heat of combustion of the alloy powder. The titled particles of spinel, forsterite, mullite, etc., having an aspect ratio of 1.0-1.3 and containing particles of 0.02-0.30mu in diameter accounting for >=85wt.% of the whole particles are collected with a bag filter 8. The atomic ratio of the metal of the alloy is 1:2 (Mg:Al) for spinel, 2:1 (Mg:Si) for forsterite and 3:1 (Al:Si) for mullite.
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