它用于高炉、转炉、电炉和钢包等冶金设备的内衬和炉顶。
含有一定比例氧化铝的氧化镁尖晶石砖也叫氧化镁铝尖晶石砖，结构为 MgAl2O4 或 MgO-Al2O3。氧化镁铝尖晶石砖不仅硬度高、热膨胀系数低、密度大，而且具有耐淬火、加热快等优点，对氧化铁、碱渣等溶剂具有良好的耐腐蚀性。
镁铝尖晶石砖
| 项目 | 索引 | |
|---|---|---|
| ω（氧化镁）/% | μ0 ≥ | 80 |
| ω（Al2O3)/% | μ0 ≥ | 10 |
| 表观孔隙率/% | μ0 ≤ | 17 |
| ở | 0.8 | |
| 体积密度（克/立方厘米） | μ0 ≥ | 2.90 |
| ở | 0.03 | |
| 冷压强度/兆帕 | L ≥ | 50 |
| ở | 5 | |
| 永久线性变化（1500℃*2 小时）/% | L~U | 0~+0.3 |
| ở | 0.05 | |
| 高温弯曲强度 (1350℃*0.5h)/MPa | μ0 ≥ | 3.5 |
| ở | 0.6 | |
| 抗热震性（1100℃，水冷）/周期 | μ0 ≥ | 12 |
| ở | 2 | |
1.Anti-Corrosion And Anti-Stripping 2.Good Thermal Shock Stability 3.Lower Thermal Conductivity 4.Good Electrical Insulation Properties
Magnesia spinel bricks are extensively used in the steel industry. They line the linings of converters, protecting against molten steel and slag corrosion. In electric arc furnaces, they endure arc impacts and temperature fluctuations. Also, they’re applied in ladles, safeguarding against steel – water erosion for stable operations.