A solution is provided comprising a strong base, a corrosion inhibitor, wherein the strong base is an alkali metal hydroxide, wherein the corrosion inhibitor is at least one of an organic acid having a-COOH functional group or an alkali metal salt one of an organic acid having a-COOH functional groups.

The present invention relates to a core for hollow product manufacture including a multilayer filling material, which may be used in forming a cooling water circulation channel through which a fluid such as cooling water may pass, and a method of manufacturing a hollow product using the core, and the core includes a pipe, having a hollow formed in the pipe and an opening formed at both ends of the pipe so that the hollow is exposed to the outside through the opening, a first support member, being disposed inside the hollow and having a space formed in the first support member, a second support member, being disposed in the space, and a melting bar, passing through the second support member in a longitudinal direction of the melting bar, wherein the melting bar melts and forms a space in the second support member when the melting bar is heated.

A method of forming channels within a substrate includes: (a) molding a sacrificial component directly into the substrate; (b) igniting the sacrificial component to cause a deflagration of the sacrificial component, thereby forming a channel in the substrate; and (c) cleaning the channel in the substrate to remove byproducts of the deflagration of the sacrificial component. The sacrificial component includes a combustible material with a protective shell, and the substrate includes a polymeric material.

A method of removing a core of a cast component includes providing a casting that includes a silica based ceramic core in a temperature controlled closed volume; cycling temperature between a first temperature and a second temperature within the temperature controlled closed volume that repeatedly subjects the silica based ceramic core to a beta-to-alpha cristobalite transition that induces microfractures in the silica based ceramic core; and after the cycling temperature, chemically dissolving the silica based ceramic core from the casting.

A container structure having one or more sections and a method for manufacturing such a structure is provided. Using an additive manufacturing process, a mold material is applied to produce a shaped substrate in the form of the desired sections and/or structure. Multiple reinforcement members are disposed within the substrate and extend between and are at least partially exposed at the inner and outer substrate surfaces. A coating material is applied to the inner and outer substrate surfaces and bonds to the exposed portions of the reinforcement members. The mold material is removed and replaced with another material among the reinforcement members between the substrate coatings.

A method of removing a core of a cast component includes providing a casting that includes a silica based ceramic core in a temperature controlled closed volume; cycling temperature between a first temperature and a second temperature within the temperature controlled closed volume that repeatedly subjects the silica based ceramic core to a beta-to-alpha cristobalite transition that induces microfractures in the silica based ceramic core; and after the cycling temperature, chemically dissolving the silica based ceramic core from the casting.

A container structure having one or more sections and a method for manufacturing such a structure is provided. Using an additive manufacturing process, a mold material is applied to produce a shaped substrate in the form of the desired sections and/or structure. Multiple reinforcement members are disposed within the substrate and extend between and are at least partially exposed at the inner and outer substrate surfaces. A coating material is applied to the inner and outer substrate surfaces and bonds to the exposed portions of the reinforcement members. The mold material is removed and replaced with another material among the reinforcement members between the substrate coatings.

A method of forming channels within a substrate includes: (a) molding a sacrificial component directly into the substrate; (b) igniting the sacrificial component to cause a deflagration of the sacrificial component, thereby forming a channel in the substrate; and (c) cleaning the channel in the substrate to remove byproducts of the deflagration of the sacrificial component. The sacrificial component includes a combustible material with a protective shell, and the substrate includes a polymeric material.

A solution is provided and includes a strong base, a corrosion inhibitor, wherein the strong base is an alkali metal hydroxide, wherein the corrosion inhibitor is at least one of an organic acid having a-COOH functional group or an alkali metal salt of one of an organic acid having a-COOH functional group.

A core discharge device is provided for discharging a sand core from a cast material in which the sand core contains a binder having water glass. The core discharge device includes a humidified gas supply device that supplies humidified gas to the sand core inside the cast molded article. The humidified gas is a gas to which humidity has been added and from which droplets have been removed.