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优质直接结合镁铬砖具有窑皮形成迅速、稳定、导热率小及使用寿命长等优点,总体性能超过了直接结合镁铬砖,满足了大中型回转窑烧成带一年使用周期的要求。
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项 目 | 指 标 |
DMGe—8 | DMGe—9 | DMGe—16 | DMGe—20 |
MgO, % 不小于 | 70 | 70 | 60 | 55 |
Cr2O3, % 不小于 | 8 | 9 | 16 | 20 |
SiO2, % 不大于 | 2.8 | 2.8 | 3.2 | 3.5 |
体积密度,g/cm3 不小于 | 2.98 | 2.98 | 3.0 | 3.05 |
显气孔率,% | 19 | 19 | 18 | 17 |
0.2MPa荷重软化开始温度,℃ 不小于 | 1600 | 1600 | 1700 | 1700 |
常温耐压强度, MPa 不小于 | 45 | 45 | 40 | 40 |
热震稳定性(1100℃水冷),次 不少于 | 4 | 4 | 6 | 6 |
热膨胀(1400℃),% | 1.8 | 1.8 | 1.7 | 1.6 |
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