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Research Article
ScienceAsia 28 (2002) :145-152 |doi: 10.2306/scienceasia1513-1874.2002.28.145
Quality Improvement of
Lampang Clay for Porcelain Bodies
Sukdipown Thiansema, Wolfgang Schulleb, Kanchana Kaew-kam-nerda, Prasak Thavornyutikarnc and Sukon Phanichphantc,*
ABSTRACT: Lampang clay from Kao Pangka, Thailand was graded into three fractions: particles sizes < 63 microns, < 40 microns, and < 10 microns. Chemical composition, mineral composition, lasticity of moist clay, and rheological properties of clay slip were determined. After firing to various temperatures, fired shrinkage, bending strength, and whiteness were measured. Lampang clay with particles less than 40 microns has the best working quality and was chosen to produce a porcelain body that matured at 1370 oC in a 2 % CO reduction atmosphere with an overall firing time of 4 hours in an industrial porcelain tunnel kiln. The mineralogy, chemical composition, and important physical properties of various porcelain body samples were measured. The best porcelain body was composed of 40 % Lampang clay of < 40 microns, 40 % ground Lampang stone, and 20 % kaolin.
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a Silicate Technology Center, Faculty of Science, Chiang Mai University, Thailand.
b Institute fur Silikattechnik, TU Bergakademie Freiberg, Germany.
c Department of Chemistry, Faculty of Science, Chiang Mai University, Thailand.
* Corresponding author, E-mail: sukdipown@hotmail.com
Received 16 Sep 2000, Accepted 22 Oct 2001
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