公开(公告)号：US10800707B2

公开(公告)日：2020-10-13

申请号：US16345386

申请日：2017-10-16

Applicant: KROSAKIHARIMA CORPORATION ,  NIPPON STEEL CORPORATION

Inventor： Yuya Tomita ,  Masato Tanaka ,  Shigeto Sawai

IPC: C04B35/043 ,  C04B35/01 ,  F27D1/00

Abstract: Provided are a magnesia carbon brick which does not include graphite yet has excellent spalling and corrosion resistances, and a method for producing thereof. The brick is obtained by adding an organic binder to a refractory raw material mixture followed by kneading, molding, and heat-treating, wherein the mixture includes total 0.1 to 2.0 mass % of pitch and/or carbon black, total 0.1 to 1.0 mass % of aluminum and/or aluminum alloy, 3.0 to 10.0 mass % of magnesia having particle diameter of less than 0.075 mm, and 87.0 to 96.0 mass % of magnesia having particle diameter of 0.075 to 5 mm; and a mass ratio of magnesia having particle diameter of 1 to 5 mm to that of 0.075 to 1 mm is 1.66 to 2.34; graphite is not included therein; and an apparent porosity thereof after heat-treatment under reductive atmosphere at 1400° C. for 3 hours is 8.0% or less.

公开(公告)号：US09522846B2

公开(公告)日：2016-12-20

申请号：US14763905

申请日：2014-01-29

Applicant: KROSAKIHARIMA CORPORATION

Inventor： Michiharu Shiohama ,  Masato Tanaka ,  Yoshinori Matsuo ,  Jouki Yoshitomi

IPC: C04B35/52 ,  C04B35/043

CPC classification number: C04B35/0435 ,  C04B2235/3205 ,  C04B2235/3821 ,  C04B2235/402 ,  C04B2235/425 ,  C04B2235/428 ,  C04B2235/5427 ,  C04B2235/5436 ,  C04B2235/5472 ,  C04B2235/652 ,  C04B2235/6567 ,  C04B2235/77 ,  C04B2235/9692

Abstract: In the present invention, the attempt was made to increase the denseness (to lower the porosity) of a magnesia carbon brick furthermore thereby providing the magnesia carbon brick having a high durability never found in the past. The magnesia carbon brick of the present invention comprises a magnesia raw material and a graphite, wherein the magnesia carbon brick contains the graphite with the amount thereof in the range of 8% or more by mass and 25% or less by mass and the magnesia raw material with the amount thereof in the range of 75% or more by mass and 92% or less by mass, the both amounts being relative to the total amount of the magnesia raw material and the graphite; as a grain size distribution of the magnesia raw material, the magnesia raw material having particle diameter of in the range of 0.075 mm or more and 1 mm or less is blended with the amount thereof being 35% or more by mass relative to the total amount of the magnesia raw material and the graphite, and a mass ratio of the magnesia raw material having the particle diameter of in the range of 0.075 mm or more and 1 mm or less to the magnesia raw material having the particle diameter of less than 0.075 mm is 4.2 or more; and an apparent porosity thereof after firing in reducing atmosphere for 3 hours at 1400° C. is 7.8% or less.

Abstract translation: 在本发明中，尝试增加氧化镁碳砖的致密度（降低孔隙率），从而提供过去没有发现的高耐久性的氧化镁碳砖。 本发明的氧化镁碳砖包括氧化镁原料和石墨，其中，氧化镁碳砖含有其量为8质量％以上且25质量％以下的石墨，氧化镁原料 其量为75质量％以上且92质量％以下的材料，两者的量相对于氧化镁原料和石墨的总量; 作为氧化镁原料的粒度分布，将粒径为0.075mm以上且1mm以下的氧化镁原料配合成相对于总量的35质量％以上的量 的氧化镁原料和石墨，并且具有粒径在0.075mm以上至1mm以下的氧化镁原料与粒径小于0.075mm的氧化镁原料的质量比 是4.2以上; 在1400℃下还原气氛烧成3小时后的表观孔隙率为7.8％以下。