Sand-sodium-silicate rods structured by steam-microwave solidification knockout from castings

Purpose.Influence of preheating temperature and sodium silicate solute content in sand-sodium-silicate mixtures structured by SMS-process on their destruction work under knock loading action has been established. Methodology. Quartz sand brand 1K2O202, water, with specific gravity 1.42…1.44 g/cm3 modulus 2.8… 3.0 have used this work. Mixtures structuring realized microwave furnace frequency 2.45 GHz magnetron power 0.9 kW. Samples heat treatment performed laboratory resistance range from 100 to 1100С sample isothermal tempering at fixed for 45...50 minutes. knockout calculated according CNIITMASH method. impact machine 5033A. structure examined optical microscope 100-times magnification. Results. With increasing steam-microwave environment SMS-method, containing 0.5 2.5% 2.8 ... 3.0, decreases exponentially. At 800 1100°C it becomes practically zero. Mixtures, preheated 600°C, does not exceed 20J. It follows that such rods or individual parts can be removed castings shock-vibration method, even copper aluminum based alloys. Knockout the parts, which after contact poured into mold melt did recommended carry out immersing water. Scientific originality. Mold core solves problem sandsodium-silicate mixtures, up 2.5%, most foundry alloys industry. Practicalvalue. Investigation results will useful removal molds, SMS-process, technologies equipment development.