文档介绍：
Effect of alcohol additives on the pore structure and
morphology of the freeze-cast ceramics#
ZENG Jing, ZHANG Yan, ZHOU Kechao, ZHANG Dou**
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(State Key Laboratory of Powder Metallurgy, Central South University, ChangSha 410083)
Abstract: The porous alumina ceramics with lamellar structure were fabricated essfully by freeze
casting. The viscosities of alumina slurries, pore structures, porosities and mechanical properties of the
sintered ceramics were investigated by introducing both types of alcohols as water solidification
modifier into the initial slurries, such as ethanol and 1-propanol. With the addition of ethanol or
1-propanol, the viscosities of slurries and porosities of sintered ceramics increased. pressive
strengths of the sintered porous alumina ceramics were improved due to a good connectivity between
lamellae with the addition of both types of alcohols. The lowest porosities of % and % and
pressive strengths of MPa and MPa were obtained by the addition of 30 wt. %
ethanol and 1-propanol, respectively.
Keywords: anic nonmetallic materials; Alumina ceramic; porous material; ethanol; 1-propanol
0 Introduction
Porous materials have attracted much attention due to their superior functions and a wide
range of applications varying from bone substitutes to part for the automotive industry including
ceramic filters, catalyst support, porous electrode, gas distributors and biomaterials insulator[1-3].
Nowadays, various fabrication techniques of porous ceramics have been developed such as gel
casting[4], direct foaming[5], polymer foam replication[6] and freeze casting[7]. Freeze casting as a
simple, versatile, low-cost, environmentally friendly plex-shape-foaming method is
widely used to prepare porous materials with aligned pores [4, 8]. During the freeze cast process, the
ceramic slurry is poured into a mould, and frozen under a certain freezing temperature forming a
lamellar struc