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 ≤200μ 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 1.0W1.3 and containing particles of 0.02W0.30μ 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.
UEKI AKIRA
MASUDA HIDENORI
GOTO YOSHIKAZU
| JPS61141604A | 1986-06-28 | |||
| JP39010306A |