SCHIAVON, M.A.YOSHIDA, I.V.P.BRESSIANI, J.C.ACCHAR, W.2014-11-172014-11-182015-04-022014-11-172014-11-182015-04-02SCHIAVON, M.A.; YOSHIDA, I.V.P.; BRESSIANI, J.C.; ACCHAR, W. Ceramic composites derived from polysiloxane/Al/Nb by AFCOP process. In: INTERNATIONAL LATIN-AMERICAN CONFERENCE ON POWDER TECHNOLOGY, 4th, Nov. 19-21, 2003, Guaruja, SP. <b>Proceedings...</b> Disponível em: http://repositorio.ipen.br/handle/123456789/15548.http://repositorio.ipen.br/handle/123456789/15548In this work, ceramic matrix composites (CMC) were prepared by AFCOP process, using a polysiloxane network filled with metallic niobium and aluminum powders as active fillers. The liquid polysiloxane precursor was loaded with a suitable polymer/filler ratio with respect to stoichiometric Nb : C and Al : O molar ratios. Changing Al by a-Al203, which acted as inert filler, non-stoichiometric conditions were obtained. The mixtures were blended, uniaxially warm pressed, and pyrolysed in flowing argon at 800, 1000 and 1200 °C. Thermogravimetry was used to follow the weight changes during the pyrolysis process. X-ray diffraction was used to identify the formation of new crystalline phases, such as Al203, NbC, Nb2C and AI 3Nb in the composites. Sintered specimens were also characterized by SEM and EDS. The results have indicated a good potential of this system to obtain multiphasic composite material in the Al-Nb system at lower temperatures.openAccessceramicsmatrix materialscomposite materialspolymerspyrolysisTexto completo de evento