Rating of thermal wear of clay materials and estimation of molding mixture freshening
Thermal wear rate is the impartial characteristic of bentonites and clays thermal resistance. It determines the part of clay materials loss after the molds pouring depending on thermal load on mixture, which is characterized by the met-al/mixture ratio. The application of thermal wear rate essentially simplifies the control of molding mixture composition and regulation of its quality. The arti-cle shows the methodology of experimental estimation of the thermal wear rate value, which is highly accurate due to the application of temperature indicators together with molding mixture. Temperature indicators register the spread of temperature field up to 3000С inside the mold. Additives of electrocorundum and starch ware used as thermal indicators. The values of thermal wear rate for Khakasskiy bentonite and Druzhkovskaya clay are shown, and also the example of estimation of bentonite quantity, which should be added to mixture for the loss compensation, is given.