High temperature phase evolution of Bolivian kaolinitic-illitic clays heated to 1250 °C

被引：47

作者：

Escalera, Edwin ^{[1
,2
]}

Tegman, Ragnar ^{[1
]}

Antti, Marta-Lena ^{[1
]}

Oden, Magnus ^{[3
]}

机构：

[1] Lulea Univ Technol, Div Mat Sci, S-97187 Lulea, Sweden

[2] San Simon Univ, Dept Chem, Cochabamba, Bolivia

[3] Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden

来源：

APPLIED CLAY SCIENCE | 2014年 / 101卷

关键词：

Bolivian ceramic clays; Illitic-kaolinite clays; High-temperature evolution; Ceramic properties; RIO-DE-JANEIRO; CERAMIC PROPERTIES; DENSIFICATION BEHAVIOR; MULLITE; SARDINIA; SMECTITE; STATE;

D O I：

10.1016/j.clay.2014.07.024

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The thermal behaviour of two types of clays collected from different locations in Bolivia has been studied. The clays contain kaolinite, illite, quartz and small amounts of microcline. The phase evolutions have been characterized from room temperature to 1250 degrees C. For both clays, kaolinite is completely transformed into metakaolinite when heated up to 650 degrees C. During further heating to 1050 degrees C, illite undergoes total dehydroxylation. Mullite is formed in the temperature interval of 1050-1150 degrees C and its formation rate is dependent on the amount of K and Fe present in the clays. The clay with higher amounts of K (3.2 mass %) and Fe (5.6 mass%) has an onset temperature for sintering at about 900 degrees C and an onset temperature for liquid formation at 1080 degrees C. This is about 50 degrees C lower onset temperature for sintering and 94 degrees C lower onset temperature for liquid formation when compared with the clay with lower amounts of K (2.3 mass %) and Fe (1.6 mass %). (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：100 / 105

页数：6

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