US 7,094,289 B2 · Method for manufacturing highly-crystallized oxide powder

Abstract

A method for manufacturing a highly-crystallized oxide powder, wherein an oxide powder is produced by ejecting a starting material powder containing at least one metal element and/or semimetal element, which will become a constituent component of the oxide, into a reaction vessel together with a carrier gas through a nozzle; and heating the starting material powder at a temperature higher than the decomposition temperature or reaction temperature thereof and not lower than (Tm/2)° C., where Tm° C. stands for a melting point of the oxide, in a state in which the starting material powder is dispersed in a gas phase at a concentration of not higher than 10 g/L. In the above method, the starting material powder may be mixed and dispersed in the carrier gas by using a dispersing machine prior to being ejected into the reaction vessel through a nozzle. The resultant oxide powder has a high crystallinity, a high dispersibility, and a uniform particle size, without introducing impurities thereinto, by a low-cost and simple production equipment.

Claims18

Dependent claims

A method for manufacturing a highly-crystallized oxide powder, wherein an oxide powder is produced by ejecting a starting material powder comprising at least one element selected from the group consisting of metal elements and semimetal elements that will become a constituent component of the oxide which is to be produced into a reaction vessel together with a carrier gas through a nozzle;

and heating the starting material powder at a temperature higher than the decomposition temperature or reaction temperature thereof and not lower than (Tm/2)° C., where Tm° C. stands for a melting point of the oxide which is to be produced, in a state in which the starting material powder is dispersed in a gas phase at a concentration of not higher than 10 g/L, wherein an oxygen source for the oxide powder is supplied from the starting material powder and/or the carrier gas.

A method for manufacturing a highly-crystallized oxide powder, comprising:

producing a starting material powder comprising at least two elements selected from the group consisting of metal elements and semimetal elements that will become constituent components of the oxide which is to be produced, at a substantially constant compositional ratio in individual particles of the starting material powder;
collecting the starting material powder;
dispersing the collected starting material powder in a carrier gas by using a dispersing machine;
ejecting the carrier gas having the starting material powder dispersed therein into a reaction vessel through a nozzle;
and
producing a double oxide powder by heating the starting material powder at a temperature higher than the decomposition temperature or reaction temperature thereof and not lower than (Tm/2)° C., where Tm° C. stands for a melting point of the double oxide which is to be produced, in a state in which the starting material powder is dispersed in a gas phase at a concentration of not higher than 10 g/L, wherein an oxygen source for the oxide powder is supplied from the starting material powder and/or the carrier gas.

3 more elements

Dependencies are inferred from the claim text.

Method for manufacturing highly-crystallized oxide powder

Life of this patent

Method for manufacturing highly-crystallized oxide powder

Life of this patent

Abstract

Claims18