Corundum bricks are refractory products with corundum as the main crystal phase, in which the Al2O3 content is greater than 90%. It has high compressive strength at room temperature (up to 340MPa). The load softening starting temperature is high (greater than 1700℃). There are two types of sintered corundum bricks and fused corundum bricks. It can be made of sintered corundum or fused corundum as raw materials, or bauxite clinker with a relatively high Al2O3/SiO2 and sintered corundum by sintering method. It can also be made of unburned corundum bricks using phosphoric acid or other binders.
| 项目/等级 | GYZ-99A | GYZ-99B | GYZ-98 | GYZ-95 | |
|---|---|---|---|---|---|
| ω（Al2O3)/% | μ0 ≥ | 99.0 | 99.0 | 98.0 | 95.0 |
| ở | 0.30 | ||||
| ω (SiO2)/% | μ0 ≤ | 0.15 | 0.2 | 0.5 | / |
| ở | 0.08 | ||||
| ω（铁2O3)/% | μ0 ≤ | 0.10 | 0.15 | 0.2 | 0.3 |
| ở | 0.03 | ||||
| 表观孔隙率/% | μ0 ≤ | 19 | 19 | 19 | 20 |
| ở | 1 | ||||
| 体积密度（克/立方厘米） | μ0 ≤ | 3.20 | 3.15 | 3.15 | 3.1 |
| ở | 0.05 | ||||
| 冷压强度/兆帕 | μ0 ≥ | 80 | 80 | 80 | 100 |
| ở | 15 | ||||
| 永久线性变化 (1600℃*3h)/% | X分钟 X最大 | -0.2~+0.2 | -0.2~+0.2 | -0.2~+0.2 | -0.3~+0.3 |
| 0.2MPa 0.6% 折射率 负载/温度 | X分钟 | 1700 | 1700 | 1700 | 1700 |
刚玉莫来石砖主要材料为进口板状刚玉、高纯电熔刚玉，采用先进的超细粉体添加技术，经混料、干燥、成型、高温梭式窑烧制而成。
电熔刚玉砖是在电弧炉中熔化氧化铝，然后浇铸成特定形状的模型。通过退火和保温，然后用金刚石磨料进行加工，即可获得所需的产品。
铬刚玉砖又称高耐磨铬刚玉攻丝砖。以α-Al2O3 为原料，加入适量铬亚粉和铬刚玉熟料细粉，经高温烧成成型。主要矿物成分为 α-Al2O3-Cr2O3 固溶体。次要矿物包括少量复合尖晶石（或无复合尖晶石）、氧化铬含量为 1% 至 30% 的耐火砖。
高铬砖以氧化铬和氧化铝为主要原料，或加入少量氧化锆。经过高温烧制而成。氧化铬含量不低于 75%，氧化铬和氧化铝含量不低于 98% 的定型耐火制品。高铬砖具有优异的抗浸出性、常温抗压强度高、耐磨性优异、耐高温、抗热震性好等特点。
1.High Hardness
2.Corrosion Resistance
3.High Temperature Resistance
4.Dimensional Stability
5.Excellent Insulation Performance
6.Good Air Permeability
用于炼铁高炉和热风炉、炼钢炉外部精炼炉、滑动式热水器、玻璃熔化炉和石化工业炉窑。