CO₂ Microwave Hardened Sodium Silicate Sand Study and Mechanism Analysis for the Moisture Resistance

Limitations and advancements of Sodium Silicate inorganic sand binders; A review

“…Furthermore, the concentration of the siloxane linkages, where hydration occurs, is higher in the case of physically dehydrated mold. Moreover, the presence of chemical species, Sodium Carbonate, lowers the effect of water polarization and diffusion [6,13].…”

“…Another proposed solution was the utilization of additives that reduce the number of hydrophilic groups within the binder. Sond et al identified that adding micro silica, polyvinyl alcohol solution, borax, and an agent called B agent in the ratio of 25: 20: 2: 1 increased the tensile strength more than four times (1.19 MPa vs 0.27 MPa) when tested after 4 hours in 90% relative humidity [13,14].…”

Enhancing fracture strength of ceramic core using sodium silicate as the binder

“…Several researchers have extensively investigated the use of sodium silicate solution as an inorganic binder for castings, which forms a slurry with high wettability when mixed with casting sands 23,24 . The kneaded sand is then placed in a mold with a specific shape (to acquire that shape), and the handling and casting are carried out through drying 25,26 . The sodium contained in the sodium silicate lowers the melting point of the glass; however, it reduces the strength of the ceramic core owing to its hygroscopicity.…”

“…23,24 The kneaded sand is then placed in a mold with a specific shape (to acquire that shape), and the handling and casting are carried out through drying. 25,26 The sodium contained in the sodium silicate lowers the melting point of the glass; however, it reduces the strength of the ceramic core owing to its hygroscopicity. Therefore, the sodium content in sodium silicate should be reduced.…”