激光烧结合成ZrW2O8材料

采用激光烧结快速合成方法成功制备出负热膨胀ZrW2O8材料。在扫描电镜(SEM)下观察样品形貌,显示出激光烧结ZrW2O8样品颗粒细小、分布均匀，晶粒大小在10 nm左右。X射线衍射(XRD)和拉曼光谱分析表明，激光法烧结可以有效地合成ZrW2O8,样品表面仅包含α-ZrW2O8，而样品内部除包含主要成分α-ZrW2O8外，还有γ-ZrW2O8相存在,可能与激光烧结过程中圆坯片内部存在极大的应力有关。同时分析了激光扫描速率对样品性能的影响，结果表明，激光烧结合成ZrW2O8时，在合适的激光功率密度下，适当地降低扫描速度，可以有效地减少γ相的产生。

Research on the Synthesis of ZrW2O8by Laser Sintering

The ZrW2O8 ceramic was successfully synthesized by laser sintering for the first time in this work. The microstructure observation by a scanning electron microscope shows that crystalline grains of the ZrW2O8 ceramic samples are fine and homogenous and that their size is about 10 nm. The analyses by an X-ray diffractometer and Raman spectrometer exhibit that only α-ZrW2O8 exists on the outside but both α-ZrW2O8 and γ-ZrW2O8 exist in the bulk of the sample. It is also confident of that ZrW2O8 ceramics can be effectively synthesize by laser sintering. The existence of γ-ZrW2O8 in the bulk may be due to the huge stress generated in the laser sintering processing. Moreover, the effect of laser scanning velocity on the properties of ZrW2O8 ceramic was analyzed. It is indicated that the amount of γ-ZrW2O8 in the bulk could be effectively cut down by means of appropriately reducing scanning velocity and optimum laser power density.