Application of acetate starch to colloidal in-suit consolidation molding process of alumina ceramic

被引:1
作者
Li, Xiao-xi [1 ]
Chen, Ling
Ye, Jian-Dong
Li, Lin
Huang, Yan-ran
机构
[1] S China Univ Technol, Inst Light Ind & Chem Engn, Guangzhou 510640, Peoples R China
[2] S China Univ Technol, Coll Mat Sci & Engn, Key Lab Specially Funct Mat & Adv Mfg Technol, Guangzhou 510640, Peoples R China
来源
High-Performance Ceramics IV, Pts 1-3 | 2007年 / 336-338卷
关键词
acetate starch; alumina; ceramic slip; consolidation in-situ forming;
D O I
10.4028/www.scientific.net/KEM.336-338.980
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
A new consolidation in-situ forming process for high-performance alumina ceramic using acetate starch was investigated. The pasting behavior and thermogelling properties of acetate starch and the effects of different amount of acetate starch and solid loading on the rheologic behavior of the ceramic slip, as well as the linear shrinkage, density, strength and microstructure of the green body were discussed. The results indicate that acetate starch paste has good thermal stability and gelling ability. When the content of acetate starch is about 0.5%similar to 1.5% (mass fraction), the apparent viscosity of alumina slurry, which is always less than 1 Pa.s even for 58% (volume fraction) dense suspension, increased with increasing the acetate starch content and solid loading. That results in easier to cast. Moreover, with the increasing of solid loading the linear shrinkage and dry strength of green bodies decreased and the relative density increased. With the increasing starch content, the linear shrinkage rate and the density of the dried body decreased, while the strength of the dried body almost linearly increased. The green body with homogeneously-distributed density and pore size was also obtained in this work. It is concluded that Al2O3 ceramics can be consolidation in-situ formed based on the gelling network of thermally swelled and gelatinized acetate starch.
引用
收藏
页码:980 / 983
页数:4
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