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I work at an Aluminum sheet casting plant, we use AlTiB as the grain refiner for our cast products.Ti:B ratio as indicated on certificates is 5:1 .We recently received a new consignment of AlTiB from another supplier in India.The certificates from our new supplier show that the The AlTiB we bought is of the same composition as the old one.However the new one doesn't yield good grains even when the rod is fed into the molten metal at faster rates.I decided to melt samples of the two Grain Refiners and determine their compositions with AAS.I made the following observations the two samples had the same composition.Interestingly the Ti: B Ratio was 20:1.Ti composition was about 10% whiles that of Boron was about 0.5%The only noticeable physical difference between the two refiner rods is the lustre, the new rod has a dull surface appearance.
QUESTION 1 : Both samples have the same composition , why don't I get good grains with new sample ?
Is there any other factor that influences AlTiB refiner properties aside composition ?
QUESTION 2 : How come Ti:B ratio for both samples(as determined by me after melting and analysing) is 20:1 rather that 5:1 as indicated on the product certificate.
QUESTION 1 : Both samples have the same composition , why don't I get good grains with new sample ?
Is there any other factor that influences AlTiB refiner properties aside composition ?
QUESTION 2 : How come Ti:B ratio for both samples(as determined by me after melting and analysing) is 20:1 rather that 5:1 as indicated on the product certificate.