STUDIES ON SEGER CONS, PART I

Feldspar is essential for the ceramic industry, as raw material for various potteries, glazes, Seger cones and so on. The quality of Seger cones, especially, depends on that of feldspar, which varies greatly according to the kind and the quantities of its impurities. Hence, on manufacturing Seger cones of superior quality, it is essential to execute most carefully various preliminary tests, physically and chemically.We examined firstly various kinds of feldspar, such as orthoclase, anorthoclase, albite, oligoclase, andesine, labradrite and anorthite, by physical and chemical methods, and confirmed mutual close relation between them. Next we prepared the mixtures of orthoclase and albite, and heating at high temperatures, confirmed their eutectic phenomenon: the point is the most important factor on manufacture of Seger cones. Lastly MgO, CaO, borax, PbO, quartz and kaoline are added respectively to orthoclase and albite, and examined various fusing phenomena due to the additions.