Gelcasting of alumina ceramics with improved green strength

摘要

Hydantion cpoxy resin with excellent water solubility and low toxicity which arc important factors in aqueous gelcasting of ceramics in air condition was firstly developed. The effect of Hydantion epoxy resin on the rheological property, gelation behavior and mechanical property was presented using Al_2O_3 as the model system. The results showed that the idle time of Al_2O_3 suspensions with the addition of Hydantion epoxy resin is sufficient for casting at room temperature. With the addition of 15 wt% Hydantion epoxy resin, the llexural strength of Al_2O_3 green body reached 43.4 MPa, which is the highest so far among the existing gelling systems and is 2.6 limes higher than the result in reported water-soluble epoxy resin systems.