Patent ID: 9522846
Filing Date: 2016-12-20
CPC Classification: C04B

Claim Text:
1. A magnesia carbon brick, comprising a magnesia raw material and a graphite, wherein the magnesia carbon brick contains the graphite with amount thereof in the range of 8% or more by mass and 25% or less by mass and the magnesia raw material with amount thereof in the range of 75% or more by mass and 92% or less by mass, the both amounts being relative to 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 amount thereof being 35% or more by mass relative to total amount of the magnesia raw material and the graphite, and a mass ratio of the magnesia raw material having particle diameter of in the range of 0.075 mm or more and 1 mm or less to the magnesia raw material having 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.