Abstract
In order to observe the deformation behaviour and further to follow qualitatively the change of viscosity and the surface tension of high feldspathic bodies in the feldspar-quartz system, small tablets, 20mm in diameter, consisting of 100-75% potash or soda feldspar and 0-25% quartz were fired in an electric furnace, and then abruptly cooled in air. Degrees of deformation of the fired specimences were measured on their vertical section, as shown in Fig. 1, microscopically and then the course of their deformation was plotted on a diagram.From the diagrams obtained, following results were concluded.:(1) Viscosity and surface tension of the bodies of feldspar-quartz system are decreasing with increase of firing temperature and soaking time.(2) Bodies of soda feldspar-quartz system have markedly lower viscosity than those of potash feldspar-quartz system and with rising temperature, the formers also show more remarkable decrease of their viscosity than the lotters do. While in the bodies containing more quartz than 20-25%, soda feldsparthic bodies rarely show a little higher viscosity than the potash feldspathic ones.(3) The surface tension of the bodies of soda feldspar-quartz system is higher than that of the bodies of potash feldspar-quartz system, but lowering of the former's surface tension with rising temperature is more striking than the latter's.(4) Flow point of soda feldspar specimen, fired with the rate of 60°C/hr, is 1270°-1280°C, and this is markedly lower than that of potash feldspar, which is 1350°-1360°C.(5) Viscosity of the bodies of feldspar-quartz system is increased with the increase of their quartz content. The increase is more remarkable and regular in soda feldspathic bodies. Tendency of this viscosity increase is reduced with rising temperature, or with prolonged soaking.(6) Bodies consisting of 90-95% potash feldspar and 10-5% quartz show a distinguishedly large deformation than anyother's, therefore “deformation eutectic”, while no such phenomena in the bodies of soda feldspar-quartz system.
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