Browsing by Author "Gunawardane, U"

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    item: Conference-Extended-Abstract
    Development of a glazed clay body suitable for cookware
    (2009) Jayawardane, JTST; Adikary, SU; Gunawardane, U
    Development of a glazed red clay cookware body with adequate thermal shock resistance was successfully locally available raw materials. Thermal compatibility of red clay and different fritted glazes were investigated thermal expansion and thermal shock resistance of individual body/glaze components. Four clay body mixtures prepared incorporating different proportion of quartz (10%, 20%, 30% and 40%) by dry weight to thermal expansion and tested with glazes. Suitable body and glaze compositions were selected and cookware samples were fabricated and required properties were tested under actual domestic conditions. red clay body with 25% quartz having a coefficient of thermal expansion 60.31x10'' Kl and thermal shock 0.97 kJ m~'s~2 and the glazes having coefficient of thermal expansion in the range of (49-51) xlO7 K1 shock resistance in the range of (1.10-1.20) kJm^s'1 could be effectively used to manufacture a glazed cookware product.
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    item: Conference-Abstract
    Effects of clay characteristics on fabrication and glazing behavior of ceramic products from Tissamaharama red clay
    (2011) Adikary, SU; Jayawardena, JTST; Gunawardane, U
    In this research work, clay deposits located at Tissamaharama region vrcji investigated for mineralogical characteristics and to identify suitable fabrication and glazing techniques. The samples were collected from a site where clay mining is been already done for the pottery industry. X-ray diffraction (XRD) analysis and chemical analysis were used to determine the mineralogical characteristics of the clay samples. XRD analysis of the clay samples showed the presence of Quartz, phyrophyllite and montmorillonite. Chemical analysis indicated the presence ofCaO, Fe:(),, Si02 and AljOj. The Tissamaharama clay belongs to montmorillonite-kaolinite group with calcareous material and hence this clay could not be effectively deflocculated. Therefore slip-casting technique is not possible as a fabrication technique. Alternatively hand throwing on the potter's wheel or jiggering could be effectively used as a fabrication method. The actual size samples, made by hand throwing on the potter's wheel exhibited good properties. For fabrication of glazed red clay items, it was observed that the coefficient of thermal expansion of clay was lower than commercially available leadless low maturing glazes. However by adding sufficient amount of quartz to the clay, coefficient of thermal expansion can be improved.
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    item: Conference-Abstract
    Modification of thermal shock resistance of a red clay body with the addition of quartz
    (2008) Jayawardane, JTST; Adikary, SU; Gunawardane, U
    The study presented in this paper describes variation of thermal shock resistance of a red clay body with the addition of different percentages of quartz. This investigation was initiated to develop a glazed red clay cookware body with good thermal shock resistance. Quartz was incorporated in the red clay to control both thermal expansion and thermal shock resistance. The thermal shock resistance of red clay body was investigated with different proportions of quartz (10%, 20%, 30%,35% and 40% quartz) at 1050°C firing temperature