Structured sand-sodium-silicate mixtures gluing with sodium silicate solute

Abstract

Purpose – method of gluing with pure silicon silicate solute (SSS) molds and cores made of structured sand-sodiumsilicate mixtures (SSSM) investigation, which solidification has been realized by microwave radiation, and engineering method for calculating the minimum admissible tensile strength of gluing joint for structured mixtures elaboration. Methodology. Quartz sand grade 1K3O3016 and RS (GOST 13078-81) with silicate modulus of 2.9 and specific density of 1.44 g/cm3 has been used in this study. Samples processing that were glued with microwave radiation have been carried out in microwave furnace with nominal magnetron power of 700 and 900W and radiation frequency of 2.45GHz.Mixtures tensile strength has been determined on LRu-2e device using figure-eight samples. Results. Method for minimum admissible tensile strength of gluing joint calculating has been developed. Taking into account its value in casting molds and rods manufacturing development will ensure molten-filled molds integrity and prevent rods displacement or separation installed in them. It has been established that pure silicon silicate solute can be used as gluing material solidifying by microwave radiation for bonding SSSM structured by steam-microwave solidification process (SMS-process).It has not been recommended to use SSS in original form as gluing material solidified by microwave radiation for bonding SSSM structured by convection heat drying. Scientific originality. For the first time, phenomenon of sodium silicate solute and quartz sand saturated with sodium silicate solute in structured SSSM simultaneous transfer during their treatment with steam-microwave radiation and new capillary-porous structures with sodium silicate increased content in them appearance have been established. Practical value. Method for calculating the gluing joint minimum permissible strength under tension will allow to obtain practical data, taking into account which, when casting molds and rods manufacturing technology developing, will ensure molds integrity when they are filled with melt and prevent rods installed in themd is placement or separation. This will generally improve castings quality. Pure SSS applying in casting molds and rods made by SMS-process gluing joints manufacturing will reduce castings production cost due to eliminating of other gluetypes using. Keywords: sodium silicate solute, microwave radiation, mold, rod, mixture, strength, gluing