Silicon carbide ceramics through temperature-induced gelation and pressureless sintering

被引：7

作者：

Xu, X

Mei, S

Ferreira, JMF ^{[1
]}

Nishimura, T

Hirosaki, N

机构：

[1] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal

[2] NatlInst Mat Sci, Adv Mat Lab, Tsukuba, Ibaraki 3050044, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 382卷 / 1-2期

关键词：

silicon carbide; temperature induced gelation; green body; suspension; pressureless sintering;

D O I：

10.1016/j.msea.2004.05.009

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Temperature-induced gelation is a novel near-net-shape method for forming ceramic green bodies from homogeneous high-solids-loaded suspensions. It is based on the change of the solubility of dispersant in solvent with changing temperature. Stable and low-viscosity suspensions of SiC, Y2O3 and Al2O3 powder mixtures were prepared in methyl ethyl keton (MEK)/ ethanol (E) solvent with solid loading as high as 60 vol.% using hypermer KD1 (a polyester/polyamine condensation polymer) as dispersant. The solubility of the dispersant in MEK/E decreased dramatically on cooling. Thus, the suspension displayed a reversible temperature-induced gelation process, being a stable and free flowing fluid at 20 degreesC, and being completely solidified at 5 degreesC. The obtained green body showed uniform microstructure, and it was possible to obtain almost theoretical density (greater than or equal to0.98) upon pressureless sintering without special dispersant burn-out procedure. The possibilities of fabricating homogeneous and complex SiC green parts that can achieve high sintered densities by pressureless sintering are demonstrated. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：335 / 340

页数：6

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