Structure and porosity of silicon oxycarbide/carbon black composites

被引:10
作者
Silva, Maria de Almeida [1 ]
Romagnoli, Erica Signori [1 ]
Pereira, Rodrigo de Carvalho [1 ]
Teixeira Tarley, Cesar Ricardo [1 ,2 ]
Segatelli, Mariana Gava [1 ]
机构
[1] Univ Londrina UEL, Dept Chem, BR-86057970 Londrina, Parana, Brazil
[2] Univ Campinas UNICAMP, Inst Chem, Bioanalyt Natl Inst Sci Technol INCT, BR-13083970 Campinas, SP, Brazil
关键词
Ceramic matrix composites; Carbonaceous phase; Silicone polymers; Pyrolysis; Polymer-derived ceramics; NANO-CARBON BLACK; ELECTRICAL-CONDUCTIVITY; SIOC; CERAMICS; POLYMER; GLASSES; NANOCOMPOSITES; PERFORMANCE; ADSORPTION; ENRICHMENT;
D O I
10.1016/j.matchemphys.2020.123503
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study describes the influence of carbon black (C-black) on structural evolution and porosity of silicon oxycarbide (SiOC)-based ceramics obtained from pyrolysis of silicone-derived polymeric precursors. Initially, polymeric precursors were synthesized by hydrosilylation reaction between poly(methylhydrosiloxane) (PHMS) and 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane (D(4)Vi), with different C-black contents (0, 1, 3, 5 and 10 wt%), followed by pyrolysis under argon at 1000 and 1500 degrees C, to give rise to the respective SiOC/C-black ceramic composites. FTIR-ATR, TG, XRD, N-2 gas physisorption at 77 K were used to characterize the carbonaceous phase, preceramic polymers and resulting ceramics. C-black incorporation, together with the pyrolysis temperature, generated more porous ceramic materials and intensified the semiconducting SiC phase formation, maintaining the presence of conducting C-graphitic structures embedded into SiOC matrices. Results concerning structural and textural features were associated to the different distributions of C-black into polymeric precursors. Moreover, the availability of residual carbon to react with degradation products during pyrolysis and produce SiC and C-graphitic crystalline phases was reported. C-black immobilization into preceramic Si-containing polymers plays an important role to produce SiOC/C-black ceramic composites with predominance of electroactive phases. The presence of C-black also contributed to higher porosities on resulting composites, which are suitable features for electrochemical investigations in polymer-derived ceramic matrices.
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页数:11
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