| 摘要 |
PROBLEM TO BE SOLVED: To provide a silica castable refractory excellent in thermal shock resistance during heating, having suppressed shrinkage under load at high temperature, good in creep resistance at high temperature, hardening in appropriate time and capable of being flow molding easily even when being a large molded body.SOLUTION: There is provided a silica castable refractory by adding Portland cement of 0.7 to 2 mass%, a water-reducing agent of 0.03 to 0.3 mass%, sodium silicate of 0.04 to 0.30 mass% in terms of NaO, by outer multiplication, based on 100 mass% of a silica refractory raw blended article consisting of molten quartz, crystalline silica consisting of cristobalite and quartz and silica superfine powder. There is provided a silica castable refractory which has blended ratio of the silica refractory raw material blended article of the molten quartz of 96 to 70 mass%, the crystalline silica consisting of cristobalite and quartz of 0 to 20 mass% and the silica superfine powder of 3.8 to 10 mass%, and may contain burnt silica of 10 mass% or less as a part of the silica refractory raw material blended article.SELECTED DRAWING: None |
