Le 13 juillet 2016, 11:53 dans Humeurs • 0
The casting process of most fused cast refractories, especially those with multi-component, is very complex, since every component has its melting point and crystallization temperature and they can be quite different.
Before discharged, the melt of fused cast refractories should be heated. For steel, before casting, it should be heated to 100℃ higher than its melting point, so as to completely fill the model and obtain castings with exact dimensions. For fused cast AZS, the temperature should be 200℃ higher. When melting and casting multi-component materials, each component can only crystallize simultaneously at their eutectic point or invariant point.
If the temperature of the melt of multi-component fused cast refractories does not reach the temperature of the component most difficult to be melt, it relies on the excessive heating of other components to discharge the melt. But in this case, there will be unmelted components. In general, each component of refractory material has no big difference, but in the ternary system of fused cast AZS and chrome spinel, the biggest difference is about 1000℃.