A new patent

pouring and self-setting core

was introduced.The core materials consist of soluble phosphate binder

magnesium oxide hardener and high-purity silicon oxide as refractory aggregate materials.Composition of the core and hardening mechanism were briefly introduced.Some key technological parameters

such as strength at both room and high temperatures and gas evolution

were tested under various conditions

and the influential factors were analyzed and concluded.Some other applying performances were also evaluated or described

including the bench time of the slurry and core accuracy

surface roughness

thermal shock resistance

collapsibility

easiness of chemical cleaning

high-temperature chemical stability of metal melt.