Processing of porous ceramics by 'starch consolidation'
Processing of porous ceramics by 'starch consolidation'
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DOI：
10.1016/s0955-2219(97)00101-5
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发表时间：
1998-01-01
影响因子：
5.7
通讯作者：
Ferreira, JMF
中科院分区：
文献类型：
--
作者：
Lyckfeldt, O;Ferreira, JMF
提出了一种新的多孔陶瓷固结成型方法，即用滑石粉作为固结剂/粘结剂和造孔剂。在湿态下对简单和复杂形状的多孔氧化铝构件进行了成型和脱模。经过干燥、烧成和烧结，获得了最终孔隙率在23%和70%之间的材料。总的孔结构由淀粉颗粒留下的大的球形孔（10-80 μ m）主导。此外，连接大孔的小孔的平均尺寸（用Hg孔隙率测定法测量）由最初制备的粉浆中的总固体含量和淀粉含量控制，并在0.5和9.5 μ m之间变化。化学改性淀粉被发现，以提供更好的尺寸控制和规则性的平均尺寸的连接孔比天然淀粉，由于在水处理过程中更稳定的性能。这种新的成型技术可用于制造各种用于隔热应用的多孔陶瓷，如过滤器/膜和气体燃烧器或生物陶瓷。主要优点是工艺简单，使用各种模具材料形成复杂形状的可能性以及所需的低成本加工设备/材料。(C)1997年爱思唯尔科学有限公司。
A new consolidation method for forming porous ceramics was developed using stal ch as both consolidator/binder and pore former. Simple and complex-shaped components of porous alumina were shaped and demoulded in wet state. After drying, burn-out and sintering, materials with ultimate porosities between 23 and 70% were obtained. The overall pore structures were dominated by the large spherically shaped pores (10-80 mu m) left by the starch particles. Furthermore, the average size of the small pores connecting the large por es, measured by Hg porosimetry, was controlled by the total solids lending and starch content in the originally prepared slips and varied between 0.5 and 9.5 mu m. Chemically modified starch was found to give better dimensional control and regularity regarding average size of the connecting pores than native starch owing to more stable properties during water processing. This new forming technique can be used in the manufacture of various porous ceramics for thermal insulation applications, as filters/membranes and gas burners, or as bioceramics. Major advantages are the simplicity of the process, the possibilities of forming complex shapes using various mould materials and the low-cost processing equipment/materials needed. (C) 1997 Elsevier Science Limited.