Process for the production of a composite of metal oxides, composite powders of metal oxides and ceramic materials
AssigneeSolvay SA
InventorsLuc Lerot, Franz Legrand, Joel Bourjot
Life of this patent
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Abstract
Process for the production of a composite of metal oxides, according to which a metal alcoholate is hydrolysed in the presence of metal (hydr)oxide particles in order to convert the metal alcoholate into a metal (hydr)oxide gel enveloping the metal (hydr)oxide particles. Powders of a composite of metal oxides obtained by this process and ceramic materials obtained by sintering a powder of this type.
Claims12
A process for the production of a pre-ceramic mixture of different metal oxides comprising:
- a) dispersing particles of a first metal oxide in a solution of an alcoholate of a second metal in an organic solvent selected from alcohol and alcohol derivatives to provide an organic suspension of said first metal oxide particles;
- b) reacting said organic suspension with water to hydrolyse said alcoholate of a second metal;
- and
- c) controlling said hydrolysis to convert said alcoholate of a second metal into a gel of a second metal oxide enveloping said particles of a first metal oxide, drying said gel of a second metal oxide enveloping said particles of a first metal oxide, fragmenting said dried gel of a second metal oxide enveloping said particles of a first metal oxide to convert it to a powder, and heating said powder under controlled conditions to crystallize said metal oxides.
A process for the production of a pre-ceramic mixture of different metal hydroxides comprising:
- a) dispersing particles of a first metal hydroxide in an organic solution of an alcoholate of a second metal to provide an organic suspension;
- b) reacting said organic suspension with water to hydrolyse said alcoholate of a second metal;
- and
- c) controlling said hydrolysis to convert said alcoholate of a second metal into a gel of a second metal hydroxide enveloping said particles of a first metal hydroxide.
A process for the production of a pre-ceramic mixture of metal oxides comprising:
- a) dispersing particles of a first metal oxide in a solution of an alcoholate of a second metal in an organic solvent selected from alcohol and alcohol derivatives to provide an organic suspension of said first metal oxide particles;
- b) reacting said organic suspension with water to hydrolyse said alcoholate of a second metal and form an oxide of said second metal enveloping said particles of a first metal oxide;
- and
- c) controlling said hydrolysis to precipitate said particles of a first metal oxide without said oxide of a second metal forming a gel.
A process for the production of a pre-ceramic mixture of different metal hydroxides comprising:
- a) dispersing particles of a first metal hydroxide in a solution of an alcoholate of a second metal in an organic solvent selected from alcohol and alcohol derivatives to provide an organic suspension of said first metal oxide particles;
- b) reacting said organic suspension with water to hydrolyse said alcoholate of a second metal and form a hydroxide of said second metal enveloping said particles of a first metal hydroxide;
- and
- c) controlling said hydrolysis to precipitate said particles of a first metal hydroxide without said hydroxide of a second metal forming a gel.
Dependencies are inferred from the claim text.