| 摘要 |
PROBLEM TO BE SOLVED: To provide a new magnesia-carbon brick having higher durability by achieving the further improvement in denseness (reduction in porosity) of magnesia-carbon brick.SOLUTION: In the magnesia-carbon brick comprising a magnesia raw material and graphite, not less than 8 mass% to not more than 25 mass% of graphite and not less than 75 mass% to not more than 92 mass% of magnesia raw material are contained in a proportion of the respective components in the total amount of the magnesia raw material and the graphite. As a particle size composition of the magnesia raw material, the magnesia raw material having a particle size of not less than 0.075 mm to not more than 1 mm is blended in a proportion of not less than 35 mass% in the total amount of the magnesia raw material and the graphite and a mass ratio of the magnesia raw material having a particle size of not less than 0.075 mm to not more than 1 mm to the magnesia raw material having a particle size of less than 0.075 is 4.2 or more. The magnesia-carbon brick has an apparent porosity after reduction firing at 1,400°C for 3 hours of 7.8% or less. |
