Thermal evolution and crystallization kinetics of potassium-based geopolymer

被引：84

作者：

He, Peigang ^{[1
]}

Jia, Dechang ^{[1
]}

Wang, Meirong ^{[1
]}

Zhou, Yu ^{[1
]}

机构：

[1] Harbin Inst Technol, Inst Adv Ceram, Harbin 150080, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2011年 / 37卷 / 01期

关键词：

Geopolymer; Thermal evolution; Crystallization kinetics; Avrami exponent; PHASE-TRANSITIONS; LEUCITE; METAKAOLIN; TEMPERATURE; CERAMICS; BEHAVIOR;

D O I：

10.1016/j.ceramint.2010.08.008

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：

In this paper crystallization kinetics of potassium-based geopolymer (Si/Al = 2.5, denoted as KG2.5) upon heating are investigated by differential thermal analysis (DTA) under non-isothermal conditions at various heating rates. From 35 to 700 degrees C KG2.5 shows a significant weight loss due to both evaporation of free water and condensation of hydroxyl groups. Crystallization of KG2.5 starts at a low temperature of, similar to 960 degrees C according to XRD and DTA analysis. KG2.5 also exhibits a low onset temperature of viscous sintering stage and on heating to 950 degrees C the sintering is completed. In the DTA graphs, the exothermic peaks which are caused by leucite crystallization shift to higher temperatures with increasing heating rate. The activation energy value of crystallization for leucite is found to be 455.9 kJ/mol and the corresponding Avarami constant is 3.89 indicating the three-dimensional crystal growth mechanism. Crown Copyright (C) 2010 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.

引用

页码：59 / 63

页数：5

共 32 条

[1] Synthesis and thermal behaviour of potassium sialate geopolymers [J].

Barbosa, VFF ;

MacKenzie, KJD .

MATERIALS LETTERS, 2003, 57 (9-10) :1477-1482

[2] Thermal behaviour of inorganic geopolymers and composites derived from sodium polysialate [J].

Barbosa, VFF ;

MacKenzie, KJD .

MATERIALS RESEARCH BULLETIN, 2003, 38 (02) :319-331

[3] Formation of Ceramics from Metakaolin-Based Geopolymers. Part II: K-Based Geopolymer [J].

Bell, Jonathan L. ;

Driemeyer, Patrick E. ;

Kriven, Waltraud M. .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2009, 92 (03) :607-615

[4] Formation of Ceramics from Metakaolin-Based Geopolymers: Part I - Cs-Based Geopolymer [J].

Bell, Jonathan L. ;

Driemeyer, Patrick E. ;

Kriven, Waltraud M. .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2009, 92 (01) :1-8

[5] GEOPOLYMERS - INORGANIC POLYMERIC NEW MATERIALS [J].

DAVIDOVITS, J .

JOURNAL OF THERMAL ANALYSIS, 1991, 37 (08) :1633-1656

[6]

Davidovits J, 2002, GEOP 2002 C

[7] Effect of cubic leucite stabilization on the flexural strength of feldspathic dental porcelain [J].

Denry, IL ;

Mackert, JR ;

Holloway, JA ;

Rosenstiel, SF .

JOURNAL OF DENTAL RESEARCH, 1996, 75 (12) :1928-1935

[8] Physical evolution of Na-geopolymer derived from metakaolin up to 1000°C [J].

Duxson, Peter ;

Lukey, Grant C. ;

van Deventer, Jannie S. J. .

JOURNAL OF MATERIALS SCIENCE, 2007, 42 (09) :3044-3054

[9] Thermal evolution of metakaolin geopolymers: Part 1 - Physical evolution [J].

Duxson, Peter ;

Lukey, Grant C. ;

van Deventer, Jannie S. J. .

JOURNAL OF NON-CRYSTALLINE SOLIDS, 2006, 352 (52-54) :5541-5555

[10]

Glukhovsky VD, 1994, ALKALINE CEMENTS CON, V1, P1

← 1 2 3 4 →