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Synthesis, characterization and sintering of Si-C-N nano-powders via sodium reduction in liquid ammonia
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2017-11-14 , DOI: 10.1016/j.jeurceramsoc.2017.11.034
Qi Wang , Mei Yang , Jiusan Xiao , Shuqiang Jiao , Hongmin Zhu

Si-C-N nano-powders with tunable carbon content were synthesized through the reduction of silicon tetrachloride (SiCl4) and trichloromethylsilane (SiCl3CH3) solution by sodium in liquid ammonia. The nano-powders contain two domains of structure, Si-C-N amorphous or continuous random networks (CRNs), and free carbon. The carbon content in Si3+nCnN4 CRNs, is tunable from n = 0 to n = 1. Free carbon will appeared with the increase of the C/Si mole ratio when C/Si is higher than 1/4. The crystallization of amorphous Si-C-N powders occurs at temperatures ranging from 1300 °C to 1500 °C depending on the carbon content. The additive-free dense Si-C-N ceramics with relatively low porosity were fabricated by Spark Plasma Sintering (SPS).



中文翻译:

液氨中钠还原法制备Si-CN纳米粉体的合成,表征和烧结

通过在液氨中用钠还原四氯化硅(SiCl 4)和三氯甲基硅烷(SiCl 3 CH 3)溶液,合成了具有可调碳含量的Si-CN纳米粉。纳米粉末包含两个结构域:Si-CN非晶或连续无规网络(CRN)和自由碳。Si 3 + n C n N 4 CRNs中的碳含量当C / Si高于1/4时,随C / Si摩尔比的增加,自由碳会从n = 0调整到n = 1。取决于碳含量,非晶Si-CN粉末的结晶会在1300°C至1500°C的温度范围内发生。通过火花等离子体烧结(SPS)制造了具有较低孔隙率的无添加剂致密Si-CN陶瓷。

更新日期:2017-11-14
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