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论文类型：期刊论文

发表时间：2015-12-15

发表刊物：MATERIALS LETTERS

收录刊物：SCIE、EI、Scopus

卷号：161

页面范围：580-582

ISSN号：0167-577X

关键字：Physical vapor deposition; Freeze-casting; Porous materials; Multilayer structure; Ceramics

摘要：A novel physical vapor deposition assisted freeze-casting method was used to fabricate porous alumina. Through reserving a gap between the cold finger and the ceramic particle suspension, the lamellar ice crystals were firstly formed on the surface of the cold finger and grew toward the suspension by physical vapor deposition. Using a moderate gap width (2.5 mm), the previously deposited lamellar ice could continuously grow into the suspension, forming lamellar alumina structure. A small (or large) gap would lead to a lamellar structure with a dense (or cellular) top layer. Simultaneously, the effects of gap size on the open porosity and compressive strength of the porous ceramics were discussed. (C) 2015 Elsevier B.V. All rights reserved.