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首页> 外文期刊>CERAMICS INTERNATIONAL >Fabrication of monolithic rGO/SiC(O) nanocomposite ceramics via precursor (polycarbosilane-vinyltriethoxysilane-graphene oxide) route
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Fabrication of monolithic rGO/SiC(O) nanocomposite ceramics via precursor (polycarbosilane-vinyltriethoxysilane-graphene oxide) route

机译：通过前体（多碳硅烷 - 乙烯基三乙氧基硅烷 - 石墨烯）途径制备整体rgo / SiC（O）纳米复合陶瓷

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摘要

In this contribution, a technique based on molding polycarbosilane-vinyltriethoxysilane-graphene oxide (PCSVTES-GO) precursors synthesized by chemical modification was introduced to fabricate monolithic rGO/SiC(O) nanocomposite ceramics. Results reveal that the monoliths pyrolyzed at different temperatures (1100-1500 degrees C) consist of beta-SiC nanocrystals homogeneously embedded in amorphous SiOxCy/C-free, and multilayered rGO nanosheets composited with beta-SiC/SiOxCy/C-free. Their nanocomposite structure provides an ingenious strategy for constructing complexes with good integrity, high ceramic yield and low linear shrinkage. This improvement is primarily attributed to the presence of GO (as graft polymers and sintering additives) which enlarges the crosslinking structure of precursors and inhibits the growth of beta-SiC nanocrystals during the pyrolysis process. The final rGO/SiC(O) monoliths sintered at 1200 degrees C with higher hardness (19.81 GPa), satisfying ceramic yield (80.98%) and linear shrinkage (25.23%) promise to be candidates for making complex-shaped ceramic components in a simple and economical manner.
机译：在这一贡献中，引入了一种基于模塑聚氨基硅烷 - 乙烯基转氧基硅烷 - 石墨烯（PCSVTES-GO）前体的基于化学修饰合成的前体，以制造整体rgo / SiC（O）纳米复合陶瓷。结果表明，在不同温度（1100-1500摄氏度）下热解（1100-1500摄氏度）的单岩组成，由均匀嵌入无定形的SiOxcy / C的β-SiC纳米晶体，而多层rgo纳米蛋白酶与β-SiC / SiOxcy / C无关组成。它们的纳米复合结构提供了一种巧妙的策略，用于构建具有良好完整性，高陶瓷产量和低线性收缩的复合物。这种改进主要归因于去（作为移植聚合物和烧结添加剂）的存在，其扩大前体的交联结构并抑制在热解过程中β-SiC纳米晶体的生长。最终的RGO / SiC（O）单片在1200摄氏度下烧结，具有更高的硬度（19.81GPa），满足陶瓷产率（80.98％）和线性收缩（25.23％）承诺是制造复杂形状的陶瓷成分的候选物和经济的方式。

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