Thermoluminescence dating of brazilian indigenous ceramics

24-Dec-2017 04:07

In the case of porcelain, where different materials and higher firing-temperatures are used, the physical, chemical and mineralogical properties of the constituents in the body are greatly altered.In all cases, the object of firing is to permanently harden the wares and the firing regime must be appropriate to the materials used to make them.This is called de-airing and can be accomplished either by a machine called a vacuum pug or manually by wedging.Wedging can also help produce an even moisture content.Thus, the maximum temperature within a kiln is often held constant for a period of time to soak the wares to produce the maturity required in the body of the wares.The atmosphere within a kiln during firing can affect the appearance of the finished wares.A common component of clay bodies is the mineral kaolinite.

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In lower-fired pottery, the changes include sintering, the fusing together of coarser particles in the body at their points of contact with each other.

Different clay bodies also differ in the way in which they respond when fired in the kiln.

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