公开(公告)号：US09821371B2

公开(公告)日：2017-11-21

申请号：US14777909

申请日：2014-03-19

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Katsumi Morikawa ,  Akinari Sasaki ,  Taro Makino ,  Ling Li

IPC: B22D41/08 ,  B22D41/54 ,  C04B35/01 ,  C04B35/043 ,  C04B35/106 ,  C04B35/482

CPC classification number: B22D41/54 ,  C04B35/013 ,  C04B35/043 ,  C04B35/0435 ,  C04B35/106 ,  C04B35/482 ,  C04B2235/3206 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/3232 ,  C04B2235/3244 ,  C04B2235/34 ,  C04B2235/3409 ,  C04B2235/3418 ,  C04B2235/3821 ,  C04B2235/3826 ,  C04B2235/401 ,  C04B2235/402 ,  C04B2235/422 ,  C04B2235/425 ,  C04B2235/428 ,  C04B2235/5427 ,  C04B2235/5436 ,  C04B2235/5445 ,  C04B2235/5472 ,  C04B2235/72 ,  C04B2235/9607

Abstract: A refractory material contains: 40 mass % or more of MgO; 4 to 30 mass % of a free carbon component; and one or more of B2O3, P2O5, SiO2 and TiO2, 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 B2O3, P2O5, SiO2 and TiO2 exists entirety or partially in a surface of each of the MgO-containing particles.