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A green fabrication strategy for porous Yb3Al5O12 ceramics with high strength and tunable gas permeability

Published online by Cambridge University Press:  13 September 2016

Xiaofei Wang ,
Huimin Xiang ,
Guigen Wang  and
Yanchun Zhou
Xiaofei Wang
Affiliation:
Shenzhen Key Laboratory for Advanced Materials, Department of Materials Science and Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China
Huimin Xiang
Affiliation:
Science and Technology of Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
Guigen Wang
Affiliation:
Shenzhen Key Laboratory for Advanced Materials, Department of Materials Science and Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China
Yanchun Zhou*
Affiliation:
Science and Technology of Advanced Functional Composite Laboratory, Aerospace Research Institute of Materials & Processing Technology, Beijing 100076, China
*
a) Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

Novel porous Yb3Al5O12 ceramics are successfully fabricated via a green and simple foam-gelcasting approach. Using a nontoxic water-soluble copolymer of isobutylene and maleic anhydride (Isobam), together with a surfactant EMAL TD (Surf-E), 50 vol% solid loading Yb3Al5O12 aqueous ceramic slurries are prepared. Thanks to the small contents of organic additives (0.4 wt% Isobam and 1 vol% Surf-E) added, low linear shrinkage (∼13.9%), and mass loss (∼2.21 wt%) are obtained after pressureless sintering of gelcasted green body at 1600 °C for 4 h under an air atmosphere. Furthermore, porous Yb3Al5O12 ceramics with controlled porosity and spherical-like cells possess excellent structural and shape stability. The flexural strength and compressive strength of the as-prepared porous Yb3Al5O12 ceramics with a relative density of 20% remain as high as 6.3 and 19.7 MPa, respectively, and the gas permeability can be tuned between 4.3 × 10−13 and 7.8 × 10−11 m2 with exponentially increasing porosity from 58% to 84%.

Keywords

ceramicporositysintering
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 19 , 14 October 2016 , pp. 3078 - 3087
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Copyright
Copyright © Materials Research Society 2016 

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