Zr对SiOC气凝微观结构和高温相位分离演变的影响
Yuqing Han1, Youqing Wu1, Sheng Huang1,2
1Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai 200237, China.
Langmuir : the ACS journal of surfaces and colloids
|November 1, 2023
概括
添加氧化碳化 (SiZrOC) 气凝具有增强的多孔性和热稳定性. 添加可以改善孔隙结构并抑制石墨化,从而产生高性能材料.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 陶工程 陶工程
背景情况:
- 氧化碳 (SiOC) 气凝以其高热稳定性而闻名.
- 优化SiOC气凝的微观结构和特性对于先进的应用至关重要.
- 剂在改变气凝特性中的作用需要进一步研究.
研究的目的:
- 为了合成和表征与相配合的氧化碳化 (SiZrOC) 气凝.
- 为了研究在热解过程中微观结构的演变和相位分离.
- 评估兴奋剂对SiOC气凝的热和结构性质的影响.
主要方法:
- 通过源化SiOC的热解合成SiZrOC气凝.
- 热解温度在900~1300°C之间.
- 使用先进的表征技术进行微结构分析和相位识别.
主要成果:
- SiZrOC气凝在热解后保持了Si-O-C结构,具有高热稳定性.
- 兴奋剂显著提高了孔径量 (3.20 cm3/g) 和孔隙性 (96.0%),同时降低了导热率 (0.023 W·m−1·K−1).
- SiZrOC-1100实现了高特异性表面积 (273.52 m2/g) 和孔积 (1.70 cm3/g) 的低导热率 (0.033 W·m−1·K−1).
- 四角形ZrO2形成抑制了高温下的碳石墨化和SiC粒的生长.
- 阶段分离产生了富含氧的SiO4单位,碳丰富的单位在1200°C以下是可以忽略不计的.
结论:
- 兴奋剂是一种有效的策略,可以增强SiOC气凝的性能.
- 三维毛孔结构在高温热解下保存良好.
- 该研究为制备用于隔热和其他应用的高性能SiZrOC气凝提供了宝贵的见解.
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