Dispensing – Molten metal dispensing – Flow controllers or assists
Patent
1990-09-14
1991-12-17
Kastler, S.
Dispensing
Molten metal dispensing
Flow controllers or assists
222597, B22D 4132
Patent
active
050728644
ABSTRACT:
Disclosed are wearable carbon-containing refractory elements, such as wearable refractory parts of a slide valve for use in controlling flow of molten metal from a metallurgical vessel, which are impregnated with tar or other wear reducing agent. In order to prevent decarburization of the refractory elements, they are saturated in an aqueous borate solution and then dried, so that the borate will migrate outwardly toward the surfaces of the elements and form protective layers which will prevent infiltration of ambient air into the refractory material. Prior to saturation of the elements in the borate solution, the wearable surfaces of the elements, such as those surfaces which will be subject to contact with molten metal, are coated with film which will prevent saturation by the borate solution, such that no protective layer is formed at the wearable surfaces. This allows the tar or other wear reducing agent to migrate outwardly through the wearable surfaces so as to reduce wear caused by the molten metal.
REFERENCES:
patent: 4108675 (1978-08-01), Tomita et al.
patent: 4617232 (1986-10-01), Chandler et al.
Page 288 of "6001 Chemical Abstracts" 104 (1986) May.
Page 348 of "6001 Chemical Abstracts" 122 (1990) Feb.
Hintzen Ullrich
Luhrsen Ernst
Schuler Andreas
Didier-Werke AG
Kastler S.
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