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Biomorphic α/β-Si3N4 composites were produced from natural sea sponge via replication method. The sponges were impregnated with a Si-containing slurry via dip-coating. After coating, the sponges were submitted to oxidation at 600°C for 1 h to decompose the bio-polymers followed by burning out of carbon, leading to a Si-skeleton. Subsequent thermal treatment at 1,450°C for 5 h under flowing nitrogen...
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