Science of Sintering 2018 Volume 50, Issue 1, Pages: 85-94
https://doi.org/10.2298/SOS1801085A
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The effect of nepheline syenite addition on pyroplastic deformation of sanitarywares
Aydın Tuna (Kirikkale University, Engineering Faculty, Metallurgy and Material Engineering Department, Kirikkale, Turkey)
Kunduracı Nazım (Bulent Ecevit University, Engineering Faculty, Metallurgy and Material Engineering Department, Zonguldak, Turkey)
Akbay Atamer (Canakcılar Ceramic Co., Gökçebey, Zonguldak, Turkey)
Nepheline syenite is used instead of feldspars as fluxing in ceramics. In
this study, three ceramic bodies were prepared. Nepheline syenite was
substituted by Na feldspar in the ratio of maximum 30 wt.%. The pyroplastic
deformation was evaluated together with technological properties, including
linear shrinkage, water absorption and strength. Phase and microstructural
characteristics were also investigated. Results showed that the addition of
nepheline syenite provided a decrease in viscosity. The decrease in viscosity
caused an increase in the tendency for pyroplastic deformation in bodies
containing nepheline syenite; however, this result shows that bodies
containing nepheline syenite can be sintered at a lower temperature than the
standard body. The addition of nepheline syenite also decreased water
absorption and increased strength.
Keywords: Nepheline syenite, Sanitaryware, Pyroplastic deformation, sintering, microstructure