Dense bulk silicon oxycarbide glasses obtained by spark plasma sintering

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• 作者：M. Alejandra Mazo ; ^{sandra@icv.csic.es} ; Cristina Palencia ; Andr&eacute ; s Nistal ; Fausto Rubio ; Juan Rubio ; Jos&eacute ; Luis Oteo
• 关键词：Sintering ; Nanocomposite ; Hardness ; Thermal conductivity ; Spark plasma sintering
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：September, 2012
• 卷：32
• 期：12
• 页码：3369-3378
• 文件大小：1211 K

摘要

Dense silicon oxycarbide glasses (SiOC) have been produced by spark plasma sintering (SPS) of SiOC powders. Raw powders were obtained by pyrolysis under nitrogen at 1100 掳C of tetraethylorthosilcate/polydimethylsiloxane (TEOS/PDMS) hybrids. SPS experiments were carried out at 1300 and 1500 掳C at 10 and 80 MPa and then were studied by chemical analysis, ²⁹Si and ¹³C MAS NMR, ATR, Raman, XRD, FE-SEM, density, porosity, microhardness (H_v) and thermal conductivity (K). The SiOC materials are formed by Si_xOC_4鈭?em>x units within a silica matrix where silicon carbide and graphite nanodomains are also present. After the SPS treatment the silicon carbide crystallite size is close to 2.5 nm. At 1300 掳C and 1500 掳C the carbon nanodomain size is close to 3 nm and 2 nm, respectively. H_v values vary from 3.4 to 9.15 GPa, for 30%and 1%of porosity, respectively. Finally, K is always close to 1.38 W m^鈭? K^鈭?.