Process for preparing ceramic powders in the presence of a source of carbon, powders thus obtained and their use
AssigneeHydro-Quebec
InventorsKarim Zaghib, Abdelbast Guerfi, Michel Armand, Patrick Charest
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Abstract
A method for preparing ceramic powders in the presence of a carbon powder including a step which consists in homogenizing a mixture of particles capable of resulting in a ceramic by heat treatment. Said method can be carried out in the presence of an accelerated solvent and provides, at reduced energy consumption, carbon-coated ceramic powders and then ceramics.
Claims12
Ceramic powder obtained by a process comprising:
- i) preparing a ceramic powder from a mixture of precursors of said powder and in the presence of at least one source of carbon, by a method comprising the following steps:
- a) homogenization, in the presence of the source of carbon and optionally in the presence of a solvent, to obtain an intimate mixture of precursor particles that can result in a ceramic product by heat treatment;
- b) removal of the solvent eventually if present in the intimate mixture obtained in step a);
- wherein the source of carbon is in solid form and is synthetic or natural carbon particles, or a mixture thereof,
- wherein the homogenization step a) is carried out by mechanofusion
- ii) subjecting the ceramic powder to at least one heat treatment at a temperature higher than 800° C.
Ceramic powders obtained by carrying out a process for the preparation of a ceramic powder from a mixture of precursors of said powder and in the presence of at least one source of carbon, comprising the following steps:
- a) homogenization, in the presence of the source of carbon and optionally in the presence of a solvent, to obtain an intimate mixture of precursor particles that can result in a ceramic product by heat treatment;
- b) removal of the solvent if present in the intimate mixture obtained in step a);
- wherein the source of carbon is in solid form and is synthetic or natural carbon particles, or a mixture thereof,
- wherein the homogenization step a) is carried out by high energy grinding,
- wherein the mixture of particles that can result in a ceramic product by heat treatment, is a mixture of particles of ZrO2 and particles of Y2O3.
Ceramic powders obtained by carrying out a process for the preparation of a ceramic powder from a mixture of precursors of said powder and in the presence of at least one source of carbon, comprising the following steps:
- a) homogenization, in the presence of the source of carbon and optionally in the presence of a solvent, to obtain an intimate mixture of precursor particles that can result in a ceramic product by heat treatment;
- b) removal of the solvent if present in the intimate mixture obtained in step a);
- wherein the source of carbon is in solid form and is synthetic or natural carbon particles, or a mixture thereof,
- wherein the homogenization step a) is carried out by high energy grinding,
- wherein the mixture of particles that can result in a ceramic product by heat treatment is a mixture of particles of Li2TiO3 and of particles of TiO2.
Dependencies are inferred from the claim text.