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Casting Porosity Of Fused Cast AZS Block

More related products: Fused Cast AZS Block; Fused Cast Alumina Block; Fused Cast High Zirconia Block; Fused Cast Skid Rail Block

It is a normal phenomenon for fused cast azs block to have porosities when pouring, however, the existence of any porosity can directly reduce the quality of fused cast azs block. But where does the porosity come from? They are generally from four aspects: furnace material, melting process, casting material, and casting process. There are two kinds of porosities caused by mold material.

1. The dense subcutaneous honeycomb porosity in perpendicular wall is caused by the working face of wet sand of fused cast azs block. Water is a gas material, a unit volume of water become water vapor when it is heated to 1000 degrees, the volume increases 1700 times when the pressure remains constant, If the temperature is heated to casting temperature, it may be nearly 10000 times. So water on the surface of sand mold forms many water vapors which will form a high pressure and make the air into the edge of melt liquid, meanwhile extending to the direction of lower resistance and then become a long type. So during the casting process, wet sand mold is forbidden to use.

2. Subcutaneous round porosity which is single round porosity within 10 mm from the edge. This kind of porosity is caused by the decomposed air when sand adhesive in contact with the melt liquid, part of the air escapes from sand void, however, part of air gets into the molten liquid of fused cast azs block due to sluggish exhaust. So it is important to note the cavity exhaust. At the same time improving the permeability of sand mold is also important.

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