RAMBO, C.R.SIEBER, H.GENOVA, L.A.2014-07-152014-07-302014-07-152014-07-302008RAMBO, C.R.; SIEBER, H.; GENOVA, L.A. Synthesis of porous biomorphic α/β-Si3N4 composite from sea sponge. <b>Journal of Porous Materials</b>, v. 15, p. 419-423, 2008. DOI: <a href="https://dx.doi.org/10.1007/s10934-007-9101-y">10.1007/s10934-007-9101-y</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/5067.1380-2224http://repositorio.ipen.br/handle/123456789/5067Biomorphic 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 promoted the nitridation of the Si resulting in α/β-Si 3N4 with an α/β fraction of 67%. The ceramic composite maintained the original morphology of the sea sponge and exhibited a porosity of 88%. The microstructure comprised whiskers, small irregular shaped particles and rod-like hexagonal grains.419-423openAccessceramicsporous materialssilicon nitridesdip coatingnitridationArtigo de periódico1510.1007/s10934-007-9101-yhttps://orcid.org/0000-0002-5172-5082