Effect of nepheline syenite on the colorant behavior of porcelain stoneware body
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The effects of nepheline syenite on the colorant behavior of porcelain stoneware tiles were assessed with special reference to the body composition. Potassium feldspar was replaced by nepheline syenite in a typical porcelain stoneware body by up to 15.6 wt.%. Technological parameters such as shrinkage, water absorption and porosity were measured. Phase composition and microstructural characteristics were determined to understand the role of nepheline syenite in the whiteness of a ceramic body. The results show that nepheline syenite had a significant effect on the sintering rate and influences remarkably the sintering behavior, increasing the shrinkage and decreasing total porosity. On the other hand there is a decrease in the amounts of mullite and quartz with addition of nepheline syenite. The bodies richer in nepheline syenite show larger amounts of albite and glassy phase. These bodies also present a higher whiteness with the same sintering conditions. The colorant characteristics appear to be directly related to the free albite crystals content. In conclusion nepheline syenite can be used in small amounts, 5 wt.%, to obtain an effective color development.
Abstract
The effects of nepheline syenite on the colorant behavior of porcelain stoneware tiles were assessed with special reference to the body composition. Potassium feldspar was replaced by nepheline syenite in a typical porcelain stoneware body by up to 15.6 wt.%. Technological parameters such as shrinkage, water absorption and porosity were measured. Phase composition and microstructural characteristics were determined to understand the role of nepheline syenite in the whiteness of a ceramic body. The results show that nepheline syenite had a significant effect on the sintering rate and influences remarkably the sintering behavior, increasing the shrinkage and decreasing total porosity. On the other hand there is a decrease in the amounts of mullite and quartz with addition of nepheline syenite. The bodies richer in nepheline syenite show larger amounts of albite and glassy phase. These bodies also present a higher whiteness with the same sintering conditions. The colorant characteristics appear to be directly related to the free albite crystals content. In conclusion nepheline syenite can be used in small amounts, 5 wt.%, to obtain an effective color development.
참고문헌 (15)
- C. Palmonari, "Porcelain Stoneware" (1989), Castellerano Fiandre Ceramiche
- M. Dondi, , Interceram, 48(2), pp.75~83 (1999)
- E. Sanchez, , Am. Ceram. Soc. Bull, 80(6), pp.43~49 (2001)
- F. Matteucci, , Ceramics International, 28, pp.873~880 (2002)
- M.F. Abadir, , Ceramics International, 28, pp.303~310 (2002)
- E.S. Vilches, "Qualicer 2002", 57~83 (2002)
- Mathematical morphology in the L*a*b* colour space, "A. Hanbury", Centre de Morphologie Mathematique, ~, pp.Technical Report N-36 (2001), 01[DOI]
- R. McDonald, "Color physics for industry" (1987), Society of Dyers and Colorists
- W.Z. Rogers, , Ceram. Eng. Sci. Proc, 24, pp.272~283 (2003)
- K.T. Tait, , Can. Mineral, 41, pp.61~70 (2003)
- "PrEN 14411, ‘‘Ceramic tiles-definitions, classification, characteristics and marking’’ (European Standard 2003)"
- "ISO 10545-3, ‘‘Determination of water absorption, apparent porosity, apparent relative density and bulk density’’ (UNI EN 2000)", ~
- "ASTM C329-88, ‘‘Standard test method for specific gravity of fired ceramic whiteware materials’’ (Annual Book of ASTM Standards)", ~ (1988)
- M.J. Orts, , Appl. Clay. Sci, 8, pp.231~245 (1993)
- M. Zhou, , CFI-Ceram. Forum. Int, 73(1), pp.49~53 (1991)