The invention relates to a
microwave preparation method of an anti-oxidation
coating made of a carbon-based material, in particular to a substrate material which may be a carbon material, a C / C
composite material or a C / SiC
composite material. In the invention,
slurry prepared by using Si compounds is coated on the carbon-based material, which is subjected to surface treatment, by a
brush or immersion, then the carbon-based material is buried in
graphite powder in a
corundum crucible, the
corundum crucible is placed in microwaves to be heated, the pre-heating, heating and temperature preservation are performed by stepwise regulating the power of a
microwave oven, and thus, an anti-oxidation single-layer
coating is obtained; on this basis, a
composite coating of oxides, silicides and the like can be obtained. In the invention, microwaves act directly on the carbon-based material and the carbon-based material, after absorbing the microwaves, generate heat raises the temperature to a required temperature, so that the
coating and a substrate are bonded and a protective coating with high protective performance is obtained; and as aluminum
powder is added as a SiC
sintering aid, the compaction of the SiC is promoted by the
silicon aluminum
alloy produced by the low-melting-point aluminum and part of
molten silicon.