Al2(WO4)3的激光烧结合成及特性

采用激光烧结技术快速成功地将比例适当的Al2O3和WO3粉末合成了形貌良好且致密的Al2(WO4)3材料,并对该材料采用多种分析手段进行了分析。 拉曼光谱分析说明在合适工艺参数下激光烧结可避免原料挥发，使原料完全参与反应。X射线衍射(XRD)分析表明合成物主要是Al2(WO4)3，属空间群Pnca，具有正交结构，可能显示负热膨胀特性，另外还含有少量的AlxWO3(x≤1)和WO3-x(x<1)。扫描电镜(SEM)发现合成物晶粒呈球形、细小、排列致密、少有气孔、尺寸约在10 nm左右。能量散射光谱(EDS)分析显示合成物内部成分分布均匀。热分析则得出合成物中少许杂相为复杂非平衡相。

Synthesis and Properties of Al2(WO4)3by Laser Sintering

A good finish and compact Al2(WO4)3 ceramic had been successfully and rapidly synthesized with a proper proportion of Al2O3 and WO3 by laser sintering. The microstructure observation, component and phases analysis of this ceramic were performed by a Raman spectrometer, scanning electron microscopy, energy-dispersive spectrometer, thermal analyzer and X-ray diffractometer. The Raman spectrum revealed that the volatility of WO3 can be avoided in the laser sintering and that the raw materials can react completely under suitable processing parameters. The analysis by a X-ray diffractiometer indicated that the sample of Al2(WO4)3 with orthorhombic structure, belonging to space group Pnca, was comparatively pure but included a small quantity of AlxWO3 (x≤1) and WO3-x (x<1). The investigation by a scanning electron microscope (SEM) and energy-dispersive spectrometer (EDS) showed that the ceramic was composed of small crystal conglomeration in which the stoichiometric proportion of elements was almost identical. The thermal analysis reveals that the impurities in the Al2(WO4)3 ceramic was various remaining non-equilibrium phase.