| 摘要 |
The invention relates to a process for producing an immersion nozzle for molten metal, in particular molten steel, from a starting mixture comprising alumina and boron nitride, using at least one flux, a binder and, if appropriate, further conventional additives, by making up the starting mixture with liquid, moulding, drying and, if appropriate, burning of the moulding, and to immersion nozzles produced by the process. The process according to the invention is characterised in that a) a part of the alumina employed is replaced by other additives having a lower tendency to form deposits than alumina and b) alumina having a maximum grain size of 250 mu m is used. The immersion nozzle produced by the process according to the invention has the advantage that is shows only a very slight tendency for oxidic constituents from the melt to adhere, or none at all, and nevertheless possesses an adequately high thermal shock resistance. |
