Process for preparing ceramic powders in the presence of a source of carbon, powders thus obtained and their use

摘要

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.

主权项

1. 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.