以硝酸铝和硅溶胶为原料,采用微沸法对合成纳米莫来石及其活化能进行研究,并用热重差示扫描热量计(TGDSC)、X射线衍射仪(XRD)和扫描电子显微镜(SEM)对合成莫来石的粒度、相组成和形貌进行分析.结果表明:在原料中的铝硅摩尔比为3∶1的条件下,温度为854℃时莫来石开始形成,温度为920℃时Al Si尖晶石开始转变为莫来石,温度为1200℃时莫来石化完成,合成莫来石的活化能为(634.52±28.90)kJ·mol-1.经过1200℃煅烧后,莫来石含Al2O3的摩尔分数为59.8％,平均粒度约为31.7nm,形状为针状,并由这些针状莫来石构成连续的网络结构.随着铝硅摩尔比的增加,合成莫来石的温度降低,活化能降低.当铝硅摩尔比增加至6∶1,合成莫来石的活化能降至(514.73±14.40)kJ·mol-1.
参考文献
| [1] | Reinhard X. Fischer;Hartmut Schneider;Dietmar Voll .Formation of Aluminum Rich 9:1 Mullite and its Transformation to Low Alumina Mullite upon Heating[J].Journal of the European Ceramic Society,1996(2):109-113. |
| [2] | MANUELA J A .Synthesis and phase transformations of mullites obtained from SiO2-Al2O3 gels[J].Journal of the European CeramicSociety,1995,16(2):781-789. |
| [3] | 杨中正,赵顺波,邢振贤,李志成,张越.高铝矾土和煤矸石合成矾土基莫来石料的研究[J].材料工程,2010(05):51-55. |
| [4] | H. Belhouchet;M. Hamidouche;R. Torrecillas;G. Fantozzi .The non-isothermal kinetics of mullite formation in boehmite–zircon mixtures[J].Journal of thermal analysis and calorimetry,2014(2):795-803. |
| [5] | Iva Buljan;Cleo Kosanovic;Damir Kralj .A novel synthesis of nano-sized mullite from aluminosilicate precursors[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2011(32):8256-8261. |
| [6] | Jin-Hong Li;Hong-Wen Ma;Wen-Hui Huang .Effect of V_2O_5 on the properties of mullite ceramics synthesized from high-aluminum fly ash and bauxite[J].Journal of hazardous materials,2009(2/3):1535-1539. |
| [7] | Shihui Li;Haiyan Du;Anran Guo .Preparation of self-reinforcement of porous mullite ceramics through in situ synthesis of mullite whisker in flyash body[J].CERAMICS INTERNATIONAL,2012(2):1027-1032. |
| [8] | Simon Sembiring;Wasinton Simanjuntak;Posman Manurung .Synthesis and characterisation of gel-derived mullite precursors from rice husk silica[J].CERAMICS INTERNATIONAL,2014(5):7067-7072. |
| [9] | MMS Sanad,MM Rashad,EA Abdel-Aal,MF El-Shahat,K Powers.Effect of Y3+, Gd 3+and La3+dopant ions on structural, optical and electrical properties of o-mullite nanoparticles[J].稀土学报（英文版）,2014(01):37-42. |
| [10] | Wang, Y.;Cheng, H.;Liu, H.;Wang, J..Microstructure and room temperature mechanical properties of mullite fibers after heat-treatment at elevated temperatures[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2013:287-293. |
| [11] | SARIN P;YOON W;HAGGERTY R P et al.Effect of transition-metal-ion doping on high temperature thermal expansion of 3:2 mullite-An in situ,high temperature,synchrotron diffraction study[J].Journal of the European Ceramic Society,2008,28(2):353-365. |
| [12] | SCHNEIDER H;SCHREUER J;HILDMANN B .Structure and properties of mullite-A review[J].Journal of the European Ceramic Society,2008,28(2):329-344. |
| [13] | 王发辉,刘莹.莫来石纤维含量对陶瓷基摩擦材料摩擦磨损性能的影响[J].材料工程,2012(12):61-65. |
| [14] | Si Wang;Xiao-Qing Shen;Hong-Chang Yao .Synthesis and sintering of pre-mullite powders obtained via carbonate precipitation[J].CERAMICS INTERNATIONAL,2010(2):761-766. |
| [15] | SUEYOSHI S S;CONTRERAS-SOTO C A .Fine pure mullite powder by homogeneous precipitation[J].Journal of the European Ceramic Society,1998,18(2):1145-1152. |
| [16] | M. M. S. Sanad;M. M. Rashad;E. A. Abdel-Aal;M. F. El-Shahat;K. Powers .Optical and electrical properties of Y~(3+) ion substituted orthorhombic mullite Y_(x)Al_(6-x) Si_2O_(13) nanoparticles[J].Journal of Materials Science. Materials in Electronics,2014(6):2487-2493. |
| [17] | Kutty TRN.;Nayak M. .Photoluminescence of Eu2+-doped mullite (xAl(2)O(3)center dot ySiO(2); x/y=3/2 and 2/1) prepared by a hydrothermal method[J].Materials Chemistry and Physics,2000(2):158-165. |
| [18] | Katsumi Yoshida;Hideki Hyuga;Naoki Kondo .Synthesis of precursor for fibrous mullite powder by alkoxide hydrolysis method[J].Materials Science & Engineering, B. Solid-State Materials for Advanced Technology,2010(1/3):66-71. |
| [19] | WANG Wei,WENG Duan,WU Xiaodong.Structure evolution and thermal stability of La2O3-doped mullite fibers viasol-gel method[J].稀土学报（英文版）,2012(02):175-180. |
| [20] | GUO X;LI W;NAKANISHI K et al.Preparation of mullite monoliths with well-defined macropores and mesostructured skeletons via the sol-gel process accompanied by phase separation[J].Journal of the European Ceramic Society,2013,33(10):1957-1974. |
| [21] | L.N.L. Santana;J. Gomes;G.A. Neves;H.L. Lira;R.R. Menezes;A.M. Segadaes .Mullite formation from bentonites containing kaolinite: Effect of composition and synthesis parameters[J].Applied clay science,2014(Jan.):28-33. |
| [22] | RUIZ DE SOLA E;ESTEVAN F;ALARC N J .Low-temperature Ti-containing 3:2 and 2:1 mullitc nanocrystals from single-phase gels[J].Journal of the European Ceramic Society,2007,27(7):2655-2663. |
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