A method for producing a salt core includes a step A of adding a saturated sodium chloride aqueous solution to a sodium chloride crystal that is granular, to prepare a slurry mixed material of sodium chloride and water, a step B of subjecting the slurry mixed material to pressure molding to obtain a molded article, and a step C of drying the molded article to remove moisture.

A method for producing a salt core includes a step A of adding a saturated sodium chloride aqueous solution to a sodium chloride crystal that is granular, to prepare a slurry mixed material of sodium chloride and water, a step B of subjecting the slurry mixed material to pressure molding to obtain a molded article, and a step C of drying the molded article to remove moisture.

A powder binder product for use in making a slurry for investment casting molds comprising Nano-sized powders; and an organic polymer powder, wherein it does not require aqueous colloidal silica to produce slurries used to build investment casting molds. The Nano-sized powders comprise fumed alumina, boehmite, fumed silica, or fumed titanium oxide or combinations thereof. The coarse refractory powder, combined with the powder binder for mold manufacture, comprises milled zircon, tabular alumina or fused alumina, fused silica, alumino-silicate, zirconia, and yttria or combinations thereof. The organic polymer in a powder binder comprises a cellulose-based material. A powder investment casting binder, that once fired, consists of up to 96 weight percent aluminum oxide.

A casting mold to cast a TiAl alloy includes a casting mold body formed into a bottomed shape and provided with a cavity. The casting mold body includes a reaction-resistant layer provided on the cavity side, formed from a refractory material containing at least one of cerium oxide, yttrium oxide, and zirconium oxide and a back-up layer formed on the reaction-resistant layer. The back-up layer includes a weakening layer formed from a refractory material including a silica material in a range from 80% by mass to 100% by mass inclusive, the silica material containing cristobalite in a range from 26% by mass to 34% by mass inclusive and the rest being fused silica, the weakening layer being designed to reduce casting mold strength and a shape-retention layer formed from a refractory material.

A casting mold to cast a TiAl alloy includes a casting mold body formed into a bottomed shape and provided with a cavity. The casting mold body includes a reaction-resistant layer provided on the cavity side, formed from a refractory material containing at least one of cerium oxide, yttrium oxide, and zirconium oxide and a back-up layer formed on the reaction-resistant layer. The back-up layer includes a weakening layer formed from a refractory material including a silica material in a range from 80% by mass to 100% by mass inclusive, the silica material containing cristobalite in a range from 26% by mass to 34% by mass inclusive and the rest being fused silica, the weakening layer being designed to reduce casting mold strength and a shape-retention layer formed from a refractory material.

The present invention relates to a steel powder having a composition containing, in mass %, 0.10≤C<0.25, 0.005≤Si≤0.600, 2.00≤Cr≤6.00, −0.0125×[Cr]+0.125≤Mn≤−0.100×[Cr]+1.800 in which the [Cr] represents the value of Cr content in mass %, 0.01≤Mo≤1.80, −0.00447×[Mo]+0.010≤V≤−0.1117×[Mo]+0.901 in which the [Mo] represents the value of Mo content in mass %, 0.0002≤N≤0.3000, and the balance being Fe and unavoidable impurities.

The present invention relates to a steel powder having a composition containing, in mass %, 0.10≤C<0.25, 0.005≤Si≤0.600, 2.00≤Cr≤6.00, −0.0125×[Cr]+0.125≤Mn≤−0.100×[Cr]+1.800 in which the [Cr] represents the value of Cr content in mass %, 0.01≤Mo≤1.80, −0.00447×[Mo]+0.010≤V≤−0.1117×[Mo]+0.901 in which the [Mo] represents the value of Mo content in mass %, 0.0002≤N≤0.3000, and the balance being Fe and unavoidable impurities.

A kneaded sand property adjusting system including: a kneading device; a kneaded sand storage hopper that stores kneaded sand; a molding device that molds the sand conveyed from the sand storage hopper; a control device that controls water injection until a property of the sand meets a kneaded sand target property; and kneaded sand amount measuring instruments that measure the amount of sand stored in storage hopper, wherein the control device stores the batch number of each kneaded batch and the kneaded sand property measured at the time of kneading, calculates the batch number of the kneaded batch that corresponds to the molding sand being loaded into the molding device by the kneaded sand amount measuring instruments, associates the property of the molding sand with the property stored on by the batch number that was calculated, and corrects the target property on the basis of the values of the properties.

A kneaded sand property adjusting system including: a kneading device; a kneaded sand storage hopper that stores kneaded sand; a molding device that molds the sand conveyed from the sand storage hopper; a control device that controls water injection until a property of the sand meets a kneaded sand target property; and kneaded sand amount measuring instruments that measure the amount of sand stored in storage hopper, wherein the control device stores the batch number of each kneaded batch and the kneaded sand property measured at the time of kneading, calculates the batch number of the kneaded batch that corresponds to the molding sand being loaded into the molding device by the kneaded sand amount measuring instruments, associates the property of the molding sand with the property stored on by the batch number that was calculated, and corrects the target property on the basis of the values of the properties.

A lining structure for a refractory vessel contains a first layer containing refractory material; a second layer, in communication with and parallel to the first layer, containing a metal layer or component; and a third layer, in communication with and parallel to the second layer, containing refractory material. The metal component in the second layer contains filled transverse passages, between the surface of the second layer in contact with the first layer and the surface of the second layer in contact with the third layer, producing support structures to maintain the structural integrity of the refractory vessel in use.