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A study on the performance of the casting clay moulds in warring states in Yan-xiadu couty in Heibei province

Lian Haiping;Shanghai Museum;  
In this paper,the macrostructure and microstructure of the Yan-xiadu clay moulds are observated,which were found in Yi couty in Hebei province.Through testing the chemical composition,mud content and size,fire-resistant,heating expansion coefficient of the Yan-xiadu clay moulds,it is found that the Yan-xiadu clay moulds had fine carving and duplicating,high dry strength,good heat stability and enough fire-resistand,low heating expansibility.Before making clay moulds,clay was sized,beated,and kept static state for some time.Before pouring liquid alloy in it,the clay mould was cured in high temperature.So the Yan-xiadu clay moulds in warring states could be used to making complicated shape and big bronze casting or iron casting.
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