| 摘要 |
PROBLEM TO BE SOLVED: To provide a basic brick capable of inhibiting the wear of bricks lined in a tank such as a metal-melting vessel, especially RH, DH, CAS, etc., which are secondary refining installations, and improving the durability and productivity of the installations, and to provide a method for producing the basic brick. SOLUTION: This basic brick has a chemical component composition comprising >=20 wt.% of MgO, >=10 wt.% of Cr2 O3 and 1-20 wt.% of ZrO2 , and has a micro tissue whose matrix portion comprises MgO and ZrO2 and whose other portions comprise >100 μm Cr2 O3 particles and MgO particles. The brick is produced from a MgO source comprising one or more kinds of sintered magnesia, electrically fused magnesia, electrically fused magnesia-chrome and sintered magnesia-chrome, a Cr2 O3 source comprising one or two kinds of >100 μm chromite and chromium oxide, and <=100 μm zirconia as starting raw materials. |
