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Interactions between Clay Bodies and Lead Glazes
Author(s) -
Molera Judit,
Pradell Trinitat,
Salvadó Nati,
VendrellSaz Màrius
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00799.x
Subject(s) - glaze , mineralogy , clay minerals , feldspar , materials science , diffusion , dissolution , metallurgy , geology , chemistry , thermodynamics , ceramic , quartz , physics
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.