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    MAGNESIA CARBON BRICK
    3.
    发明公开
    MAGNESIA CARBON BRICK 有权
    MAGNESIUMOXID-KOHLENSTOFF斯坦

    公开(公告)号：EP2952494A1

    公开(公告)日：2015-12-09

    申请号：EP14745785.7

    申请日：2014-01-29

    申请人： Krosakiharima Corporation

    发明人： SHIOHAMA, Michiharu ,  TANAKA, Masato ,  MATSUO, Yoshinori ,  YOSHITOMI, Jouki

    IPC分类号： C04B35/043

    CPC分类号： 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

    摘要： 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.

    摘要翻译： 在本发明中，尝试增加氧化镁碳砖的致密度（降低孔隙率），从而提供具有过去从未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，以及粒径为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; 并且在1400℃下在还原气氛中烧成3小时后的表观孔隙率为7.8％以下。