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A method for gelcasting high-strength alumina ceramics with low shrinkage

Published online by Cambridge University Press:  03 January 2014

Yi Sun ,
Shunzo Shimai ,
Xiang Peng ,
Manjiang Dong ,
Hidehiro Kamiya  and
Shiwei Wang
Yi Sun
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China; and University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
Shunzo Shimai
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China; and Tokyo University of Agriculture and Technology, Tokyo 183-8538, Japan
Xiang Peng
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China; and University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
Manjiang Dong
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
Hidehiro Kamiya
Affiliation:
Tokyo University of Agriculture and Technology, Tokyo 183-8538, Japan
Shiwei Wang*
Affiliation:
Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: swwang51@mail.sic.ac.cn
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Abstract

A new kind of nontoxic, water-soluble copolymer consisting of isobutylene and maleic anhydride was used to gelcast alumina ceramics at room temperature in air. The polymer acts as both a dispersant and a gelling agent. The influence of the polymer on zeta potential, rheological and gelling behavior of the alumina slurry was studied. Copolymers with a lower molecular weight had greater dispersing ability. Copolymers with a larger molecular weight had greater gelling ability. Alumina slurries with solids loading up to 58 vol% were prepared by adding copolymer (0.3 wt%, relative to the powder) with both short and long molecular chains. Increasing solids loading from 50 to 58 vol% decreased the linear shrinkage from 4.63% to 1.50% after drying, and from 14.51% to 13.18% after sintering, respectively. A solids loading of 56 vol% was associated with the highest flexural strength, as high as 534 MPa.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 2 , 28 January 2014 , pp. 247 - 251
Copyright
Copyright © Materials Research Society 2013 

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References

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