Krosakiharima Corporation

Taro Makino

Kazuo Ito

Katsumi Morikawa

Keiichiro Akamine

Akinari Sasaki

Ling Li

Zenta Oomaru

A refractory material contains: 40 mass % or more of MgO; 4 to 30 mass % of a free carbon component; and one or more of BO, PO, SiOand TiO, in a total amount of 0.3 to 3 mass %, with the remainder being at least one other type of additional refractory component. A void layer exists in an interface between a carbon-containing matrix microstructure residing at least on opposite sides of a maximum-size one of a plurality of MgO-containing particles in the refractory material, and the maximum-size MgO-containing particle. A sum of respective thicknesses of the void layer at two positions on the opposite sides is 0.2 to 3.0% of a ratio with respect to particle size of the maximum-size MgO-containing particle. An inorganic compound of MgO and the one or more of BO, PO, SiOand TiOexists entirety or partially in a surface of each of the MgO-containing particles.

Refractory material and casting nozzle

A refractory to be used repeatedly or for a long period of time, such as a refractory for casting, especially a nozzle for casting and an SN plate, has improved tolerance. The refractory for casting contains AlOC in the range of 15 to 60% by mass, both inclusive, an Al component as a metal in the range of 1.2 to 10.0% by mass, both inclusive, and a balance including AlO, a free C, and other refractory component; a sum of AlOC, AlO, and the Al component as a metal is 85% or more by mass; and a content of AlOC (AlOC), a content of the Al component as a metal (Al), and a content of the free carbon (C). The contact of the free carbon satisfies the following Equation 1 and Equation 2:1.0&#x2266;C/(AlOC&#xd7;0.038+Al&#xd7;0.33)&#x2003;&#x2003;(Equation 1)and1.0&#x2267;C/(AlOC&#xd7;0.13+Al&#xd7;0.67)&#x2003;&#x2003;(Equation 2).

Refractory for casting, nozzle for casting and sliding nozzle plate using same

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Taro Makino