Fabrication porous Si3N4 ceramics via starch consolidation–freeze drying process
Fabrication porous Si3N4 ceramics via starch consolidation–freeze drying process
复制标题
通过淀粉固结→冷冻干燥工艺制备多孔Si3N4陶瓷
DOI：
10.1016/j.matlet.2011.09.092
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发表时间：
2012-02
影响因子：
3
通讯作者：
中科院分区：
文献类型：
--
作者：
通过淀粉固结-冷冻干燥工艺制备了孔隙率~72%的Si3N4陶瓷。采用预胶凝方法减小作为固结剂/粘合剂和造孔剂的淀粉的颗粒尺寸。添加聚乙烯醇（PVA）以控制冰晶生长。结果表明，Si3N4陶瓷的孔隙率主要受浆料浓度控制，淀粉/PVA含量对孔隙率影响较小。随着PVA含量的增加，35μm左右的大孔减少，微观结构变得更加均匀。添加 0% 和 2.5% PVA 时获得了典型的三峰孔径分布，添加 5% PVA 的样品仅表现出双峰孔径分布，没有大孔。随着PVA含量的增加，弯曲强度从6.7MPa增加到42.3MPa。
Si3N4ceramics with porosity of ~72% were prepared via starch consolidation–freeze drying process. Pre-gelled method was used to reduce the granular size of starch which acted as consolidator/binder and pore forming agent. Polyvinyl alcohol (PVA) was added to control ice crystal growth. The results indicated that the porosities of Si3N4ceramics were mainly controlled by slurry concentrations, starch/PVA contents had slight influence on the porosities. With higher PVA content, large pores around 35μm were decreased, the microstructure turned more uniform. Typical trimodal pore size distributions were obtained with 0 and 2.5% PVA addition, the sample with 5% PVA only showed bimodal pore size distribution without large pores. The flexural strength was increased from 6.7 to 42.3MPa with increasing PVA content.
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影响因子：
3.9
作者：
G. Jiang;Jianfeng Yang;Jiqiang Gao;K. Niihara
通讯作者：
G. Jiang;Jianfeng Yang;Jiqiang Gao;K. Niihara
影响因子：
5.4
作者：
Alves, HM;Tari, G;Ferreira, JMF
通讯作者：
Ferreira, JMF
影响因子：
5.7
作者：
Lyckfeldt, O;Ferreira, JMF
通讯作者：
Ferreira, JMF
DOI：
10.1111/j.1151-2916.2002.tb00426.x
发表时间：
2002-09-01
影响因子：
3.9
作者：
Fukasawa, T;Deng, ZY;Kanzaki, S
通讯作者：
Kanzaki, S
影响因子：
5.7
作者：
Díaz, A;Hampshire, S
通讯作者：
Hampshire, S