Characterization of Microstructure and Properties of Porous Ceramics Made by Extrusion

擠出成型為陶瓷業界經常採用製程技術，其成功仰賴於恰當的配方以及製程條件。本研究中，配料組成包括：氧化鋁、高嶺土、去離子水、纖維素HPMC以及甘油等助劑。擠出實驗則使用水平式單螺桿擠出機，操作變數例如：黏著劑添加量、氧化鋁對高嶺土體積比、以及燒結條件，對於樣品的多孔微結構，以及應用特性的影響皆列入研究之中。成品的分析項目包括：孔隙度、孔徑分佈、比穿透性、以及撓曲強度，其中後兩者特性，又再與前兩者微結構間建立關係。研究中也比較擠出程序所製得成品與過去乾壓成型成品間的異同。吾人的結果顯示，本擠出程序可以製得微結構均勻，且應用特性優良的成品，將可繼續應用作為生長無機膜的基版。

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並列摘要

Extrusion is a widely employed technique in industry to fabricate ceramic objects, Successful extrusion relies on proper formulation and processing conditions. In this work, the paste consists of dispersed alumina and kaolin particles in deionized water with hydroxypropyl methylcellulose (HPMC) and glycerol as processing aids. Extrusion was performed using a horizontal single screw extruder. The influence of the amount of binder and the volumetric ratio of alumina to kaolin, as well as sintering conditions on the microstructure and properties of the porous discs were investigated. The products were examined for its porosity, pore size distribution, specific permeability, and flexural strength, where the latter two properties were further related to their porous characteristics. Comparison was then made between extruded samples and dry pressed ones from our previous work for their similarities and differences. Our results indicated that the current extrusion process is very satisfactory in producing uniform microstructure and desirable properties for future application as support of membranes.

並列關鍵字

Extrusion ； Porous Cerarnic Disc ； Kaolin ； Alumina ； Porosity ； Permeability ； Flexural Strength

國際替代計量

Characterization of Microstructure and Properties of Porous Ceramics Made by Extrusion

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