| Almost all the felspars investigated showed partial kaolinization.
A/war soda felspar had the lowest softening point The
Alwar felspars had a medium, the Nellore felspars a short and the
Jh~nsi and Kodarma felspars a relati-vely long softening range.
Tzvo eutectics, one in the binary system of 4lwar soda and
Alzoar potash felspar ( 40% of the former and 60% of the latter )
and another in the binary system of Ahoar Soda and Nellore
potash felspar (equal quantities of the tzoo) were observed. The
blends of felspars when used in a porcelain body developed, earlier
verification and greater strength, but their translucency was very
poor. Trials on a low melting leadless glaze showed that the
gloss of the glaze increased zvith increase of potash felspar in the
blends. |
