Formation of Ceramics from Metakaolin‐Based Geopolymers. Part II: K‐Based Geopolymer

Journal of the American Ceramic Society - Tập 92 Số 3 - Trang 607-615 - 2009
Jonathan L. Bell1, Patrick E. Driemeyer1, Waltraud M. Kriven1
1Department of Materials Science and Engineering University of Illinois at Urbana‐Champaign Urbana, Illinois 61801

Tóm tắt

The structural evolution and crystallization of potassium‐based geopolymer (K2O·Al2O3·4SiO2·11H2O) on heating was studied by a variety of techniques. On heating from 850–1100°C, potassium‐geopolymer underwent significant shrinkage and surface area reduction due to viscous sintering. Small, 15–20 nm sized precipitates present in the unheated geopolymer coarsened substantially in samples heated between 900° and 1000°C. However, the microstructural surface texture was dependent on the calcination conditions. Leucite crystallized as the major phase after being heated to >1000°C, although a minor amount of kalsilite was also formed. Prolonged heating for 24 h at 1000°C led to the formation of ∼80 wt% of leucite, along with 20 wt% of remnant glassy phase. The surface of geopolymers heated to 1000°C attained a smooth, glassy texture, although closed porosity persisted until 1100°C. Thermal shrinkage was completed by 1100°C, and the material reached 99.7% of the theoretical density of tetragonal leucite.

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