Browsing by Author "Pussepitiya, PPSS"

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    item: Thesis-Abstract
    Development of a high thermal shock resistant ceramic body suitable for cookware
    Pussepitiya, PPSS; Adikary, SU
    Development of a ceramic based cookware body with adequate thermal shock resistance was successfully developed using low cost raw materials. The objective of this work was to determine the composition and thermal shock resistance of a ceramic body suitable for a direct flame cookware. To achieve this objective cookware body should have low thermal expansion coefficient, high strength, low water absorption and high thermal shock resistance. In this study ball clay, talc, alumina and zirconium silicate were used as starting raw materials and twenty five samples were investigated with different compositions. All samples were wet-mixed, shaped by slip casting, dried and fired to temperature 12500C in an electric furnace. Modulus of Rupture (MOR) was tested by the three point bending method; the thermal conductivity of each body was measured with Lee’s disk method and the Coefficient of Thermal expansion (CTE) was measured by thermo mechanical analyzer. The thermal shock resistance of each sample was calculated with Kingery’s formula. Optimum thermal shock resistance of 74 KJm-1s-1was achieved for a body composition of 45% of clay, 15% of talc, 15% of alumina and 25% of zirconium silicate which was fired to 12500C. Further modulus of rupture and coefficients of thermal expansion of the ceramic body were 74 MPa and 30.2×10-7 /0C respectively. These results suggest that the ceramic body is suitable to be used in cookware applications.
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    item:
    Development of a high thermal shock resistant ceramic body suitable for cookware applications
    (2015-07-22) Pussepitiya, PPSS; Adikari, SU
    Development of a ceramic based cookware body with adequate thermal shock resistance was successfully developed using low cost raw materials. The objective of this work was to develop a ceramic body composition suitable for cookware to be used in direct flame cooking. To achieve this objective, cookware body should have low thermal expansion coefficient, high strength, low water absorption and high thermal shock resistance. In this study, ball clay, talc, alumina and zirconium silicate were used as starting raw materials and twenty five samples were investigated with different compositions. All samples were wet-mixed, shaped by slip casting, dried and fired to a temperature of 12500C in an electric furnace. Modulus of Rupture was tested by the three point bending method, the thermal nductivity of each body was measured with Lee’s disk method and the coefficient of thermal expansion was measured by thermo mechanical analyzer. The thermal shock resistance of each sample was calculated with Kingery’s formula. Optimum thermal shock resistance of 0.74 kJm-1s -1 was achieved for a body composition of 45% of clay, 15% of talc, 15% of alumina and 25% of zirconium silicate which was fired to 12500C. Further, modulus of rupture and coefficient of thermal expansion of the ceramic body were 74 MPa and 30.2×10-7 K-1, respectively. These results suggest that the ceramic body is suitable to be used in cookware applications.
  • Thumbnail Image
    item: Article-Abstract
    Development of a high thermal shock resistant ceramic body suitable for cookware applications
    Pussepitiya, PPSS; Adikary, SU
    Development of a ceramic based cookware body with adequate thermal shock resistance was successfully developed using low cost raw materials. The objective of this work was to develop a ceramic body composition suitable for cookware to be used in direct flame cooking. To achieve this objective, cookware body should have low thermal expansion coefficient, high strength, low water absorption and high thermal shock resistance. In this study, ball clay, talc, alumina and zirconium silicate were used as starting raw materials and twenty five samples were investigated with different compositions. All samples were wet-mixed, shaped by slip casting, dried and fired to a temperature of 1250°C in an electric furnace. Modulus of Rupture was tested by the three point bending method, the thermal conductivity of each body was measured with Lee's disk method and the coefficient of thermal expansion was measured by thermo mechanical analyzer. The thermal shock resistance of each sample was calculated with Kingery's formula. Optimum thermal shock resistance of 0.74 kJm-VHvas achieved for a body composition of 45% of clay, 15% of talc, 15% of alumina and 25% of zirconium silicate which was fired to 1250°C. Further, modulus of rupture and coefficient of thermal expansion of the ceramic body were 74 MPa and 30.2*10-7 K-1, respectively. These results suggest that the ceramic body is suitable to be used in cookware applications.
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    item: Conference-Abstract
    Precision investment casting of aluminium machine parts using specially designed ceramic mould
    Pussepitiya, PPSS; Adikary, SU; Gunawardena, U
    jlsvestment casting process is a well established manufacturing process with greater product design feedom from very simple to highly complex parts with tight dimensional tolerances and excellent = surface finish compared to ther casting processes. Therefore expensive machining, wastage of insaterial could be reduced or eliminated while providing more design economy and flexibility than pother casting process.: The investment casting is widely used for producing complex geometries of ferrous and non ferrous . materials [1]. Many researches have been performed on this subject during past four to five decades. 'The ancient method of investment ("lost wax") casting of metal components has been transformed asto a near net shape forming technique offering jt the designer at the forefront of metal casting, .'economy and flexibility [2]