公开(公告)号：US20230028785A1

公开(公告)日：2023-01-26

申请号：US17780392

申请日：2020-12-08

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Kouhei TAKAMI ,  Katsumi MORIKAWA ,  Shigefumi MATSUMOTO

IPC: B22D41/54 ,  C04B35/106 ,  C04B38/00

Abstract: Provided is a refractory product which is not impregnated with pitch or the like, wherein it has higher corrosion-erosion resistance and thermal shock resistance as compared to a refractory product subjected to pitch or the like-impregnation treatment. The refractory product which is not impregnated with tar or pitch is characterized in that, in terms of values of physical properties of a sample of the refractory product as measured after heat-treating the sample in a non-oxidizing atmosphere at 1200° C.: an apparent porosity is 7% or less; a total void volume of pores having a pore diameter of 1 μm or less is 80% or more of an integrated void volume of pores of the entire sample of the refractory product; and a gas permeability is 50×10−17 m2 or less.

公开(公告)号：US20220388910A1

公开(公告)日：2022-12-08

申请号：US17770387

申请日：2020-10-23

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Ling LI ,  Katsumi MORIKAWA ,  Akinari SASAKI ,  Shigefumi MATSUMOTO

IPC: C04B35/484 ,  C04B35/057 ,  C04B35/653 ,  C04B41/50 ,  C04B41/87 ,  B22D11/10

Abstract: Provided is a ZrO2—CaO—C based refractory material which is capable of maintaining high adhesion resistance over a long period of time, while exhibiting significant slaking resistance, and suppressing self-fluxing, i.e., exhibiting corrosion-erosion resistance. The refractory material comprises a CaO—ZrO2 composition containing a CaO component in an amount of 40% by mass to 60% by mass, wherein a mass ratio of the CaO component to a ZrO2 component is 0.67 to 1.5, and wherein the CaO—ZrO2 composition includes a eutectic microstructure of CaO crystals and CaZrO3 crystals, wherein a width of each of the CaO crystals observable in a cross-sectional microstructure is 50 μm or less.