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By Tyrrel E. Biddle

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Thus a typical fire-clay sanitary ware glaze is as given in B9 in Table 3-2. T1 The glaze used for refire can either be the same as for the first fire (refire at the same temperature), or a variation on the first glaze where the fluxes are modestly increased so that the refire can be at lower temperature. M7The opacity arises from the high concentrations of zinc oxide that are used. A Bristol glaze can be formulated from porcelain glazes through substitutions of large quantities of zinc oxide for the alkalies and alkaline earths.

These glazes are typical of those suitable for use on artware and hobbyware bodies. At still lower maturing temperatures, glazes become simpler again, involving the use of only one basic oxide, lead oxide, and eliminating boric oxide. These glazes are based on lead bisilicate with small additions of alumina to retard phase separation. Some examples ofJead bisilicate glazes are also given in Table 3-6. These glazes can be fired as low as cone 010 for special effects in artware and hobbyware glazing.

E24 The interface between the glass coating and the metal substrate is critical to the development of bonding between these two dissimilar materials. The glass coating must not only act as a protective and aesthetically pleasing surface, but also must bond to the metal substrate. 1 Adherence Before proceeding to a discussion of materials for porcelain enameling, a few words about the phenomenon of adherence is in order. A more comprehensive discussion will be found in Chapter 14. p2 As will be discussed later, this is accomplished by saturating both the enamel coating and the substrate metal with an oxide of the metal.

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