作　　者： ; ; ; ;

机构地区： 辽宁工业大学材料与化学工程学院

出　　处： 《铸造》 2010年第3期251-254,共4页

摘　　要： 将小米种子排列成模板,通过在模板内对Al2O3浆料进行离心成形来制备孔径均匀的Al2O3泡沫陶瓷。观察了浆料固相含量对Al2O3生坯密度均匀性的影响,研究了植物种子特性对Al2O3生坯干燥和焙烧行为的影响,测量烧结产物的密度、收缩率、孔隙率和压缩强度,并通过体式显微镜和扫描电镜观察Al2O3泡沫陶瓷的宏观结构和显微组织。研究结果表明,小米和Al2O3生坯具有较好的收缩匹配性,干燥后可以保持生坯形状完整。在较高的固相含量(50%,体积分数)下,离心时的物质分离现象被抑制,孔壁具有较高的生坯相对密度(63.8%)。1500℃烧结2h后,Al2O3泡沫陶瓷具有致密的孔壁和较高的烧结相对密度(98.9%),其孔隙度为66.5%,抗压强度为5.26MPa。 Open-cell Al2O3 ceramic foams with uniform cell size were fabricated by centrifugal slip casting using the plant seeds as the templates. The effect of solid contents of slurries on green density uniformity of Al2O3 compacts was analyzed and the effect of characteristic of plant seeds on drying and presintering behavior of Al2O3 green compact was also studied. The sintering density, shrinkage, porosity and compressive strength of the final products were measured. Macrostructure and microstructure of sintered Al2O3 ceramic foams were observed by stereoscope and scanning electron microscopy. The results show that the millet and Al2O3 green compact had better shrinkage matching and after drying the green compact remained in good shape. Mass segregation of Al2O3 particles was hindered for slurries with high solid fraction of 50 vol. %. The cell struts of green bodies had high relative density of 63.8%. After sintered at 1 500 ℃ for 2 h, the final products had dense cell struts with high sintered relative density of 98.9% and homogeneous microstructure. The porosity and compressive strength of sintered products was 66.5% and 5.26 MPa, respectively.

关 键 词： 泡沫陶瓷 植物种子 模板 离心成形

领　　域： [化学工程] [化学工程]