Thermal conductivity of slip-cast quartz at various temperatures

Thermal conductivity of slip-cast quartz at various temperatures

Junjie Chen

Contributor: Junjie Chen, ORCID: 0000-0001-5055-4309, E-mail address: [e-mail], Department of Energy and Power Engineering, School of Mechanical and Power Engineering, Henan Polytechnic University, 2000 Century Avenue, Jiaozuo, Henan, 454000, P.R. China

Slip casting, or slipcasting, is a ceramic forming technique for pottery and other ceramics, especially for shapes not easily made on a wheel.[1] In this method, a liquid clay body slip is poured into plaster moulds and allowed to form a layer, the cast, on the inside walls of the mould. The process usually takes at least 24 hours per piece. It gives very precise and consistent shapes, and is now the most common technique used for commercial mass-produced pottery. The type of clay body suited for slip casting differs from that for throwing. It is essential to make a good quality casting slip to get an intended result. The behavior of the slip will depend on multiple factors, including the types and proportions of water, clay, other chemicals, and deflocculant used; temperature, humidity and other local conditions; and the amount of energy involved in mixing the ingredients together to form a suspension. The process of changing a slurry from something thick and gooey to something thin and pourable that can be used in slip casting is called deflocculation. The process by which particles come out of the suspension is called flocculation. The technique is suited to the production of complex shapes, especially if with relief decoration and thin walls. Much modern fine factory porcelain is made by the technique, very often the entire production. It is also commonly used for sanitaryware, such as toilets and basins, and smaller pieces like figurines and teapots. The technique can also be used for small-scale production runs or to produce limited-edition, one-off objects, especially reproductions of antique dolls and modern porcelain doll-making.

Thermodynamic temperature (degrees kelvin), Thermal conductivity (watts per meter-kelvin)

500        0.34

700        0.39

900        0.45

1100             0.51

1300             0.62

900        0.63

1000             0.66

1100             0.69