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Aluminum silicate ramming mass is made of pure raw materials with low iron and low impurity content through reasonable grading and high-efficiency admixture. It has high fire resistance, good abrasion resistance, strong thermal shock resistance, strong corrosion resistance, and other excellent characteristics. It can be divided into different materials according to the raw materials used.
Technical Parameter of aluminum silicate ramming material
| Item | Silicon carbide | Zirconium Chrome Corundum | ||
| NMK4 | NMK5 | NMK6 | NMK7 | |
| Al2O3 % | / | / | / | ≥80 |
| SiC % | ≥40 | ≥60 | ≥70 | / |
| Cr2O3 % | / | / | / | ≥3 |
| ZrO2 % | / | / | / | ≥2 |
| Bulk Density g/cm3 110℃×24h | ≥2.4 | ≥2.5 | ≥2.6 | ≥2.8 |
| Permanent Linear Change % 1000℃×3h | -0.4~0 | -0.5~0 | -0.6~0 | -0.6~0 |
| Cold Crush Strength MPa 1000℃×3h | ≥60 | ≥70 | ≥80 | ≥90 |
| Wear resistance at room temperature cm3 1000℃×3h | ≤7 | ≤6 | ≤5 | ≤5 |
| Thermal shock stability cycle 1000℃ water cooling | ≥30 | ≥35 | ≥40 | ≥30 |
| Plasticity Index % | 15~55 | |||
| Plasticity W/(m·K) 1000℃ | 3~5 | 5~7 | 6~8 | 2~3 |
| Maximum service temperature ℃ | 1400 | 1500 | 1600 | 1600 |
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