Saturday, September 8, 2012

how to minimize/stop the erosion in high alumina bottom pouring sets, without much cost increase.

One can try magnesia - carbon refractory coating over the high alumina bottom pouring sets. The coating can be applied using carbonaceous adhesives.

Using BP set manufactured by small companies then probable cause of this erosion can be lower alumina content than specified or using a low melting clay as binder to reduce firing temperature. Total alumina can be checked by sending sample to any reputed lab for chemical testing. However for checking low melting matrix, you have to test hot MOR or RUL property of the sample. In case of low melting matrix, it will fuse at steel temperature and will not hold the grains, so more erosion. So buy only from manufacturers who have high temperature kilns to make fire proper grade of BP sets.


 Reduced oxygen content in the steel will be better for the refractories. I recall a case where the customer "killed" the steel in the ladle with some aluminum prior to casting. It is costly to measure oxygen but will give good information if you can do this.

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