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β‐SiC powders with different particle morphologies were prepared by combustion synthesis in an N2 atmosphere, with carbon black, carbon fiber, graphene, and graphite as carbon sources. With carbon black as the carbon source, single‐phase β‐SiC nanopowder with an average particle size around 20 nm was obtained. From carbon fiber and graphene, SiC fibers and sheets were produced, which were polycrystalline...