Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/34602
Type: Artigo de periódico
Title: Poly(borosiloxanes) as precursors for carbon fiber ceramic matrix composites
Author: Siqueira, Renato Luiz
Yoshida, Inez Valéria Pagotto
Pardini, Luiz Claudio
Schiavon, Marco Antônio
Abstract: Ceramic matrix composites (CMCs), constituted of a silicon boron oxycarbide (SiBCO) matrix and unidirectional carbon fiber rods as a reinforcement phase, were prepared by pyrolysis of carbon fiber rods wrapped in polysiloxane (PS) or poly(borosiloxane) (PBS) matrices. The preparation of the polymeric precursors involved hydrolysis/condensation reactions of alkoxysilanes in the presence and absence of boric acid, with B/Si atomic ratios of 0.2 and 0.5. Infrared spectra of PBS showed evidence of Si-O-B bonds at 880 cm-1, due to the incorporation of the crosslinker trigonal units of BO3 in the polymeric network. X ray diffraction analyses exhibited an amorphous character of the resulting polymer-derived ceramics obtained by pyrolysis up to 1000 °C under inert atmosphere. The C/SiBCO composites showed better thermal stability than the C/SiOC materials. In addition, good adhesion between the carbon fiber and the ceramic phase was observed by SEM microscopy
Subject: precursors
poly(borosiloxanes)
carbon fibers
composites
Editor: ABM, ABC, ABPol
Rights: aberto
Identifier DOI: 10.1590/S1516-14392007000200009
Address: http://dx.doi.org/10.1590/S1516-14392007000200009
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392007000200009
Date Issue: 1-Jun-2007
Appears in Collections:Unicamp - Artigos e Outros Documentos

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