Interactions between Clay Bodies and Lead Glazes
Judit MoleraDepartament de Cristallografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, 08028 Barcelona, SpainTrinitat PradellEscola Universitària d'Enginyeria Tècnica Agrícola, Universitat Politècnica de Catalunya, 08036 Barcelona, SpainNati SalvadóDepartment d'Enginyeria Tècnica, EUPVG, Universitat Politècnica de Catalunya, 08800 Vilanova i la Geltrú, SpainM. Vendrell‐SazDepartament de Cristallografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, 08028 Barcelona, Spain
2001en
ABI
Abstract
A set of laboratory experiments has been developed to determine the nature and importance of the interaction between clay bodies and lead glazes during firing following different thermal paths (firing time and temperature, cooling rates) and using different glaze compositions and different bodies (illitic, kaolinitic, and calcareous clays). It is shown that the interaction consists of a digestion/diffusion process. This process involves (i) decomposition of the phases forming the clay body (digestion), (ii) chemical diffusion of elements between clay body and glaze, and (iii) formation of a layer (interface between clay and glaze) of small K‐Pb feldspar crystallites.
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