多孔質陶瓷濾材之製作與特性研究

Preparation and Characterization of Porous Ceramic Filter

陳智成(C. C. Cheng) ； 王振興(J. S. Wang) ； 林文豪(W. H. Lin) ； 顏富士(F. S. Yen)

《材料科學與工程》 34卷2期 (2002/06) Pp. 107-111

https://doi.org/10.6409/JMSE.200206.0107

摘要

本研究以氫氧化鋁為主要原料，利用氫氧化鋁燒除結晶水產生的孔隙，採用擠出成形法製作多孔質陶瓷濾材。並探討此濾材之製程條件對孔隙特性的影響。結果顯示，採用氫氧化鋁取代氧化鋁製作富鋁紅柱石陶瓷體，可大幅提高燒結體之孔隙率至55.6%，並獲得較細而均一的穿透性孔隙。氫氧化鋁在250-350ºC間燒除結晶水而殘留的孔隙，是其大幅提高孔隙率之主要原因，唯在此期間需減緩升溫速率並做適當的特溫，才能避免坏體的破裂。

關鍵字

富鋁紅柱石 ； 濾材 ； 孔隙 ； 氫氧化鋁

並列摘要

Using Al(OH)3 as raw material to fabricate porous ceramic filter by extrusion method, the pore is formed within the ceramic due to the evaporation of crystal water originally existing in Al(OH)3 during process. The report is aimed at studying the effects of process parameters on the pore characteristics. The results show that the mullite instead of aluminum hydride oxide to fabricate the porous ceramic filter can significantly increase the porosity of sintered body up to 55.6% and obtain a more narrow and uniform distribution of pore size.
The main reason that porosity can significantly increase within porous ceramic filter is due to the evaporation of crystal water existing in Al(OH)3 during the reaction temperature of 250ºC ~ 350ºC, which will form a great amount of pore. A slower heating rate and a soaking process in the periods of 250ºC ~ 350ºC are needed to prevent the crack formation during heating process.

並列關鍵字

Mullite ； Filter ； Pore ； Al(OH)3