以NaCl-Na2 CO3为熔盐介质制备了镁橄榄石多孔材料，采用压汞法研究了材料内部气孔的结构特征，利用SEM表征了材料的显微结构；采用综合热分析仪分析孔的形成机理，并在 Menger 海绵体构造模型的基础上，用分形理论对材料的孔径参数进行表征；研究了烧成温度与原料中盐配比对气孔分形维数的影响，探讨了气孔的分形维数与孔径分布的关系.结果表明，制备的镁橄榄石多孔材料内部气孔以6．6和66μm为界点，具有三重分形特征，其原因是材料内部气孔的成孔机理不同.原料配比中NaCl和Na2 CO3的含量都为20％，经1100℃烧后材料内部气孔的体积分形维数最小，为2．16895；此时材料内部孔径集中分布于6．6~66μm.
Pore diameter of forsterite materials prepared in NaCl-Na2 CO3 molten salt media was determined by mercury intrusion porosimetry (MIP),and pore volume fractal dimension of materials was characterized by the fractal theory on the basis of Menger tectonic model.The comprehensive thermal analyzer was used to analyse pore formation mechanism and the scanning electron microscope (SEM)was used to observe the microstructure of pores.The connection of pore volume fractal dimension with the porosity,and pore size distribution were in-vestigated by comparing the different sintering temperatures and contents of salt to the effect of fractal dimen-sion.The porous materials synthesized by molten salt media have three fractal characteristics resulted from dif-ferent pore forming mechanism,when pore size distributed in <6.6,6.666μm,and >66μm,respectively.The porous materials sintered at 1 100 ℃ exhibited good properties as the pore diameter was homogeneous concen-trating on 6.666μm,meanwhile,the content of NaCl and Na2 CO3 were both 20% and the fractal dimension was low to 2.16895.
参考文献
| [1] | 徐建峰;石干;马明军;裴春秋.利用橄榄石废弃粉矿制备轻质耐火材料[J].非金属矿,2011(2):65-67. |
| [2] | 邓承继;周亮;祝洪喜;丁军.镁橄榄石质隔热材料的制备及其性能研究[J].武汉科技大学学报（自然科学版）,2011(6):432-435. |
| [3] | 贾治彬;智伟;李金雨;卢晓英;刘剑阳;盛露瑶;许韬韬;段可;屈树新;翁杰.羟基磷灰石基多孔复合支架的制备及其表征?[J].功能材料,2014(18):18129-18134. |
| [4] | Li, Yanrong;Huang, Runqiu.Relationship between joint roughness coefficient and fractal dimension of rock fracture surfaces[J].International Journal of Rock Mechanics and Mining Sciences,2015:15-22. |
| [5] | 龚宁峰;王印培.非金属夹杂物分形特征研究[J].机械工程材料,2003(4):24-26. |
| [6] | 朱伯铨;方斌祥;李享成;万洪波;李宁.刚玉质浇注料气孔孔径分布及其与强度的相关性[J].硅酸盐学报,2009(6):994-999. |
| [7] | 李永鑫;陈益民;贺行洋;韦江雄;张文生;张洪滔;郭随华.粉煤灰-水泥浆体的孔体积分形维数及其与孔结构和强度的关系[J].硅酸盐学报,2003(8):774-779. |
| [8] | 郑瑛;周英彪;郑楚光.多孔CaO孔隙结构的分形描述[J].华中科技大学学报(自然科学版),2001(3):82-84. |
| [9] | 张小军;祝洪喜;邓承继;员文杰;丁军.熔盐法制备镁橄榄石轻质保温隔热材料的物相及性能[J].机械工程材料,2015(2):26-29. |
| [10] | 张玉涛;王德明;仲晓星.煤孔隙分形特征及其随温度的变化规律[J].煤炭科学技术,2007(11):73-76. |
| [11] | Wang HT.;Chen FL.;Meng GY.;Sorensen OT.;Liu XQ..Kinetics and mechanism of a sintering process for macroporous alumina ceramics by extrusion[J].Journal of the American Ceramic Society,19983(3):781-784. |
| [12] | Xuebin Zhang;Xingqin Liu;Guangyao Meng.Sintering Kinetics of Porous Ceramics from Natural Diatomite[J].Journal of the American Ceramic Society,20057(7):1826-1830. |
| [13] | 韦江雄;余其俊;曾小星;白瑞英.混凝土中孔结构的分形维数研究[J].华南理工大学学报（自然科学版）,2007(2):121-124. |
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