C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 41/87 (2006.01) B22D 17/30 (2006.01) C04B 41/50 (2006.01) C04B 41/85 (2006.01)
Patent
CA 2205632
A riser tube for transfer of molten metal therethrough, including a porous ceramic substrate having a hollow cylindrical structure and ceramic impregnant material penetrating into pores of the substrate and plugging at least a portion of the surface pores thereof, to improve gas impermeability of the substrate. According to the present invention, the porous ceramic substrate is immersed in impregnation media containing ceramic particles, the impregnation media is subjected to an elevated pressure such that the media penetrates the pores of the substrate, and the impregnated substrate is then fired, whereby the ceramic particles form a ceramic impregnant material that plugs at least a portion of the surface pores of the substrate.
Colonne montante pour transfert de métal fondu comprenant un substrat en céramique poreuse à structure cylindrique creuse et une matière d'imprégnation à la céramique pénétrant dans les pores du substrat et bouchant au moins une partie des pores de surface de manière à améliorer l'imperméabilité au gaz du substrat. Selon la présente invention, le substrat de céramique poreuse est immergé dans une matière d'imprégnation contenant des particules de céramique, la matière d'imprégnation est soumise à une pression élevée de manière que ladite matière pénètre les pores du substrat, et le substrat imprégné est ensuite cuit, de sorte que les particules de céramique forment une matière d'imprégnation à la céramique qui bouche au moins une partie des pores de surface du substrat.
Gardner Matthew T.
Larsen David A.
Blasch Precision Ceramics Inc.
Dimock Stratton Llp
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