Factors affecting the microstructure of a fine ceramic foam
Factors affecting the microstructure of a fine ceramic foam
复制标题
DOI：
10.1016/s0272-8842(00)00032-8
复制
发表时间：
2000-01-01
影响因子：
5.2
通讯作者：
Evans, JRG
中科院分区：
文献类型：
--
作者：
Peng, HX;Fan, Z;Evans, JRG
使用粗氧化铝粉和细氧化铝粉及其70/30的混合物制备了具有不同网状程度的烧结多孔陶瓷。在每种情况下，陶瓷泡沫具有细的泡孔尺寸（约150 μ m直径）。制备方法包括使这些粉末的悬浮液在20体积%下自由膨胀。在聚氨酯发泡体系中。为了改变微观结构，使用模具对抗膨胀，这减小了空隙率和窗口尺寸。此外，通过在长圆柱形容器中膨胀泡沫来实现定向上升，这改变了最终泡沫的泡孔形状。这些泡沫在包括催化在内的一系列应用中具有潜在的用途，但目前工作的主要目的是制备金属基复合材料的预制件。(C)2000 Elsevier Science Ltd和Techna S.r.l. All rights reserved.
Sintered cellular ceramics with varying degrees of reticulation were prepared using coarse and fine alumina powders and a 70/30 mixture thereof. The ceramic foams had fine cell size (about 150 mum diameter) in each case. The method of preparation involved the free expansion of suspensions of these powders at 20 vol.% in a polyurethane foaming system. In order to modify the microstructure, the expansion was opposed using a die, and this reduced the void fraction and window size. In addition, directional rising was achieved by expanding the foam in a long cylindrical Vessel and this modified the cell shape of the final foam. These foams have potential use in a range of applications including catalysis, but the main aim of the present work was to prepare preforms for metal matrix composites. (C) 2000 Elsevier Science Ltd and Techna S.r.l. All rights reserved.