利用含铝废渣合成的堇青石结构表征

采用铝型材厂工业废渣,滑石粉和粘土为主要原料合成堇青石材料,用XRD和SEM法表征各样品的晶相结构和显微结构;用Rietveld Quantification内标半定量法确定各晶相的含量;用Philips X'pert plus软件确定各晶相的晶胞参数.实验结果表明:除晶胞参数发生微小变化外,合成的堇青石结构与单晶相同,属六方晶系,p6/mcc空间群;除堇青石相外,体系内还出现莫来石固溶体相和镁铝尖晶石相,他们的含量和晶胞参数也相应的进行了表征.     

Synthesis and Characterization of High-purity Aluminum Titanate with Water Quenching Method

High-purity aluminum titanate was synthesized via a water quenching method with waste-residue in the aluminum factory and industrial TiO2 as the main raw materials, which belongs to the comprehensive utilization of solid wastes. Compared with the conventional method, it can reduce synthesis temperature, effectively inhibit decomposition and raise the content of AT; the addition of tiny silicon powder can improve the sintering and optimize the properties of AT. The crystalline phase structure and microstructure of each sample were characterized with XRD and SEM methods; the content of each crystalline phase in each sample was confirmed with Rietveld Quantification method; the properties of each sample were also tested. The experimental results showed that No. 4 is the optimum specimen, with the corresponding mass ratio of Al2O3/TiO2 to be 1.27 and the content of AT of 97.2 wt%. The addition of optimum tiny silicon powder is confirmed to be 8wt%; its corresponding bulk density is 2.63 g/cm^3, bending strength is 46.34 MPa, and the retention of one thermal vibration bending strength is 71.5%.     

K_2O矿化剂对硅微粉结合SiC窑具析晶结构,性能与氧化动力学影响的研究

在硅微粉结合SiC窑具中添加适量的K2O矿化剂，能使体积效应大的a-方石英转化成体积效应小的α-鳞石英，其矿化能力与MnO2相当[1]，但比MnO2矿化剂更有适用价值。采用XRD法确定析晶结构及其含量，探讨析晶结构对窑具性能的影响，从中确定最佳的K2O添加量为1．5％。     

Preparation and Characterization of High-quality α-Al2O3/Al4.59Si1.41O9.7/Al2TiO5 Multiphase Material

The α-Al2O3/Al4.59Si1.41O9.7/Al2TiO5 multiphase material with high performance was prepared by reaction sintering. The influence of different formulas on the structures and properties of multiphase material was investigated to determine the optimal formula. Crystalline structure and cell parameters of sintered samples were characterized by XRD. Microstructure of all samples was observed by SEM. The properties of sintered samples were investigated. The results show that corundum phase (α-Al2O3 ), mullite solid solution phase (Al4.59Si1.41O9.7 ) and aluminium titanate phase (Al2TiO5 ) were formed in the sintered samples. Different formulas would not change the symmetry of each crystalline phase, but caused slight change in their cell parameters. The optimal formula was determined to be coarse corundum of 36%, fine corundum of 21%, total amount of three kinds of clay of 33%, and TiO2 of 12%, which possessed a comparatively ideal microstructure and optimal properties.     

陶瓷辊棒在辊道窑使用过程中晶相结构与性能变化

采用XRD和SEM方法表征不同位置辊棒的晶相结构与显微结构来探讨陶瓷辊棒在实际窑炉使用过程晶相结构和性能变化。采用物理方法表征辊棒的性能。实验结果表明:不同位置辊棒存在莫来石、刚玉、硅酸钙镁三种晶相。莫来石含量是按未使用的(80.8%)→预热带的(78.4%)→烧结带的(73.4%)→冷却带的(71.5%)的顺序降低;刚玉含量按17.7%→19.2%→18%→22.5%的顺序变化;而晶相硅酸钙镁含量按1.5%→2.4%→7.6%→6%的顺序变化;体积密度和使用寿命按上述顺序降低的,而气孔率和吸水率按上述顺序增加的。