作　　者： ; ; ; ;

机构地区： 东北大学材料与冶金学院

出　　处： 《功能材料》 2007年第3期397-399,403,共4页

摘　　要： 将等直径的发泡聚苯乙烯(EPS)小球排列成有序的模板,通过在模板内离心成型制备孔径均匀的多孔氧化铝陶瓷。研究了多孔陶瓷孔结构的调整方法,分析了离心参数对孔壁生坯密度的影响,借助了TG-DTG曲线确定了焙烧工艺,用扫描电镜表征了最终产物的显微结构。结果表明,多孔陶瓷的孔结构可以通过改变小球的直径和所承受的附加载荷来调整。当氧化铝浆料的固相含量超过50%(体积分数),离心成型的物质分离现象被抑制,孔壁具有较高的生坯密度63.4%和烧结密度98.8%,当烧结产物的孔隙率从75.6%增加到83.2%,压缩强度由3.2MPa降到1.78MPa。 Epispastic polystyrene （EPS） spheres with uniform diameters were used to array ordered templates and then centrifuging in them prepared porous alumina with uniform cell size. The adjustment of cell structure and effect of centrifugal parameters on green density of cell wall were studied. According to TG-DTG curves, the sintered schedule was decided. The microstructure of final products was observed by scanning electron microscope. The results showed the cell structure was adjusted by changing the diameters of EPS spheres and additional loads exerted on them. The mass segregation derived from centrifugation was hindered with the 50vol% slurries. Cell wall had high green density （63.4%） and sintered density （98.8%）. When the porosity of final products increased from 75.6% to 83.2%, their compressive strength decreases from 3.2MPa to 1.78MPa.

关 键 词： 离心 模板 固相含量 均匀孔径

领　　域： [化学工程] [化学工程]