Method for producing heat-resisting compound oxides
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsShinichi Takeshima, Akio Koyama
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Abstract
A method for producing a heat-resisting compound oxide in which first oxide particles are made to carry second fine particles having near charging characteristics. Said first oxide particles or their precursors are caused, before said first oxide particles or their precursors are caused to adsorb said first oxide particles or their precursors, to adsorb a predetermined acid or base so that they may be charged inversely of said second fine particles or their precursors to be adsorbed thereby. Said first oxide particles are caused to adsorb said second fine particles through said acid or base and are sintered to carry the same.
Claims6
A method for producing a heat-resisting compound oxide in which first oxide particles are made to carry second oxide particles having near charging characteristics, the method comprising in order:
- synthesizing the first oxide particles or their precursor particles within micelles, the micelles having an aqueous phase therein and being dispersed in a solvent;
- charging said first oxide particles or their precursor particles within the micelles to a potential inverse to that of the second oxide particles or their precursor particles to be synthesized, when the first oxide particles or their precursor particles absorb an acid or base in the micelles;
- synthesizing second oxide particles or their precursor particles within the micelles;
- absorbing the second oxide particles on the first oxide particles within the micelles;
- and
- sintering the first oxide particles so that the first oxide particles carry the second oxide particles,
- wherein the second oxide particles or their precursor particles have a smaller diameter than the first oxide particles or their precursor particles and have charging characteristics similar to charging characteristics of the first oxide particles.
Dependencies are inferred from the claim text.