以苎麻纤维为生物模板,经溶胶-凝胶和碳热还原过程制得具有苎麻纤维管状形态的SiC多孔陶瓷。研究了试样的物相构成、显微结构和孔特征,探讨了试样制备过程中的反应机理。结果表明SiO2溶胶与苎麻碳在真空环境、1500℃温度下的碳热还原反应主要为SiO2与C的固-固反应,也包括SiO与C及CO之间局部的气-固和气-气反应。经除碳后得到SiC多孔陶瓷保留了苎麻纤维的空心管状结构形貌,物相组成主要为β-SiC。经脱胶麻较之原麻所制备的试样管状纤维结构更为完整,试样孔结构主要为狭缝型孔隙,BET比表面积为12.97m2/g,BJH平均孔径为9.6nm,P/P0=0.97时的孔容为0.037731cm3/g,孔径分布呈多级分布特征。
Biological tubular SiC porous ceramics were prepared from ramie fibers as the template material by sol-gel and carbothermal reduction methods.Phase composition,holes characteristics and microstructure of the specimens had been studied.Combined with the thermodynamic analysis,the reaction mechanism of the material preparation had been also discussed.The results showed that carbothermal reduction of SiO2 gel and C derived from ramie was mainly the solid-solid reaction of SiO2 and C,including the local gas-solid and gas reactions of SiO and C or CO.SiC porous ceramics had inherited the hollow tracheid structure of ramie fibers,and the major phase was β-SiC.Compared with the samples derived from ramie without degumming,the samples derived from degummed ramie showed the more integral hollow structure of fibers,the major pore structure is slit type,BET is 12.97m2/g,BJH is 9.6nm,the pore volume is 0.037731cm3/g when P/P0=0.97 and pore size distribution presented the multi-stage characteristics.
参考文献
| [1] | 孙莹,谭寿洪,江东亮.多孔碳化硅材料的制备及其催化性能[J].无机材料学报,2003(04):830-836. |
| [2] | 江泽慧,任海青,费本华,张东升,岳永德,陈晓红.竹炭及SiC陶瓷材料的结构与性能[J].新型炭材料,2006(01):1-8. |
| [3] | 艾桃桃.生物形态多孔SiC陶瓷的制备技术[J].中国陶瓷,2009(04):31-35,55. |
| [4] | 张荻,孙炳合,范同祥.遗态材料的制备及微观组织分析[J].中国科学E辑,2004(07):721-729. |
| [5] | 王庆,王冬华,靳国强,郭向云.具有高粱微观结构多孔SiC的制备与表征[J].无机材料学报,2008(03):602-606. |
| [6] | 钱军民,王晓文,金志浩.气相反应渗入法制备多孔SiC的研究[J].硅酸盐学报,2004(04):497-501. |
| [7] | 钱军民,金志浩.生物形态SiC陶瓷的研究[J].陶瓷科学与艺术,2003(06):9-15. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%