Filtering medium for molten metal and method for producing...

B - Operations – Transporting – 22 – D

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B22D 43/00 (2006.01)

Patent

CA 2670723

A filtering medium for molten metal which is excellent in inclusion removal performance and durability and further may provide sufficient throughput and a method for producing the same. A filtering medium for molten metal in the present invention includes a two-layered structure of a macropore ceramic layer at the inflow side and a micropore ceramic layer at the outflow side. The average pore diameter of the micropore ceramic layer is from 100 to 500 µm and the average pore diameter of the macropore ceramic layer is 1.1 to 3.0 times as large as that of the micropore ceramic layer. When respective layers are formed of aggregates bonded with an inorganic binder and the inorganic binder has a needle crystal structure with an aspect ratio of 2 to 50, the inside of filtering medium may be contributed to the filtration and the compatibility between inclusion-trapping performance and lifetime may be ensured.

Divulgation d'un milieu de filtration pour métal en fusion qui présente une excellente performance pour l'élimination d'inclusions et une excellente durabilité, et qui peut aussi permettre un rendement suffisant. Divulgation aussi d'une méthode pour produire ce milieu. Un milieu filtrant pour métal en fusion de la présente invention comprend une structure à deux couches constituée d'une couche de céramique macroporeuse du côté du flux entrant et une couche de céramique microporeuse du côté du flux sortant. Le diamètre moyen des pores de la couche de céramique microporeuse est de 100 à 500 µm et celui des pores de la couche macroporeuse est 1,1 à 3,0 fois celui des pores de la couche microporeuse. Quand les couches respectives sont formées d'agrégats liés avec un liant inorganique et le liant inorganique a une structure de cristaux en aiguille avec un rapport d'aspect de 2 à 50, l'intérieur du milieu filtrant peut contribuer à la filtration et la compatibilité entre la performance inclusion-piégeage et la durée de vie peut être assurée.

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