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The quality of molten aluminum is dependent on the methods used for its treatment, and the rigid media tube filter RMF is the most reliable means of removing inclusions from molten aluminum. In the present study, we examined the effects of adding SiO 2 to alumina filters bound by aluminum borate 9Al 2 O 3 · 2B 2 O 3 : 9A2B to improve the penetration of molten aluminum into the filter. With the addition of SiO 2 , although the amount of 9A2B crystal was decreased by formation of borosilicatedoi:10.2464/jilm.60.55 fatcat:ah2rxmy4ofbzpoi3y6dhjrlz34