Le 21 juillet 2016, 05:58 dans Humeurs • 0
Since AZS brick is a multi-component product, each component has its melting point and crystallization temperature and differ from each other by hundreds or thousands of degrees.
As we all know, melt should be heated before casting to make its temperature a little higher than its melting point, generally by 100℃. This can ensure the melt can fully fill the mold and obtain castings with precise dimensions. For AZS bricks, the temperature should be 200℃ higher. When melting and casting multi-component melt, the casting temperature is up to the eutectic point or invariant point. At this temperature, different components can crystallize simultaneously.
If the temperature of AZS melt does not reach the melting point of the component with the highest melting point, the casting of melt can rely on the overheating of other components with low melting point. But, in this case, the melt will contain unmelted components. In general, each component of common refractory materials will not differ from each other too much in the melting point. But, for the ternary system of AZS bricks, the difference is about 1000℃. This makes the casting of AZS bricks more difficult.