Influence of Nepheline syenite on Rheological

  Properties of Porcelain Stoneware Slip

  S.H.Jazayeri , A.Salem ,G.Timellini , E.Rastelli 

  Abstract

  The aim of the work is to study the effect of nepheline syenite on rheological properties of porcelain stoneware slips . The porcelain stoneware slips containing different amounts of nepheline syenite are prepared and flow curve ,yield stress and thixotropy are studied by a rotational rheometer. It is found that substituting 10% of potassium feldspar by nepheline , the viscosity , yield stress and thixotropy of slips decrease.