Abstract:
Provided is an improvement to the erosion and thermal shock resistance of zirconia/carbon-containing refractory material in the high zirconia range where the zirconia content exceeds some 80 mass%. A zirconia/carbon-containing refractory material containing at least 80 mass% zirconia and carbon base material, in which carbon bonds are formed between the aggregate particles, wherein the sum of the open pore volume within the refractory material structure and the volume of the carbon base material is not more than 42 vol% but at least 25 vol%, the pores of 10 µm or more among all of the open pores in the refractory material structure account for not more than 30%, and the carbon base material particles of maximum length exceeding 45 µm in the carbon base material in said zirconia/carbon-containing refractory material account for less than 60 mass% of all of the carbon base material, excluding the bonding carbon, in said zirconia/carbon-containing refractory material.
Abstract:
The present invention relates to a well block for use in a metallurgical vessel. The well block (1) is designed for receiving a nozzle (5) or a porous plug. The well block comprises a pressed carbon bonded sleeve (2) for improved wear resistance and easier nozzle repair. The present invention also relates to a process for making a well block according to the invention.
Abstract:
The present invention concerns an element for the casting of a liquid metal, comprising a base body made from a refractory material, said body comprising an outer surface and an inner surface defining a pouring channel for the casting of the liquid metal. This element is characterized in that at least a part of the element inner surface is coated with an insulating coating forming, at the metal liquid contact, a gas impermeable layer. Such an element has an excellent thermal shock resistance which permits its use without preheating. Then a layer reducing advantageously the gas permeability is formed.
Abstract:
Die Erfindung betrifft einen keramischen Formkörper, dessen Oberfläche zumindest abschnittsweise von einer Stahlverkleidung verdeckt ist, wobei die Stahlverkleidung auf ihrer den Formkörper nicht verdeckenden Fläche zumindest abschnittsweise mit einem zunderhemmenden Stoff belegt ist.
Abstract:
A continuous casting nozzle for molten steel, wherein a nozzle inner hole surface layer, in contact with the molten steel, of the continuous casting nozzle is obtained by adding, before kneading and molding, a binder to Al2O3 or a composition consisting of Al2O3 as a main component, 15 to 60 wt. % of an aggregate having a melting temperature of not lower than 1800 DEG C and agalmatolite as the remaining part, and firing the molded product in a non-oxidizing atmosphere.
Abstract translation:一种用于钢水的连续铸造喷嘴,其中连续铸造喷嘴的与钢水接触的喷嘴内孔表面层通过在捏合和模塑之前将粘合剂加入到Al 2 O 3或由Al 2 O 3组成的组合物中获得 主要组分,15至60wt。 熔融温度为1800℃以上的骨料的%,作为剩余部分的石榴石,在非氧化性气氛中烧成成型品。
Abstract:
The invention relates to a ceramic composite body, especially used in secondary metallurgy, comprising at least one first layer that is made of an oxidic refractory material that contains carbon, and at least one second layer that is made of an oxidic refractory material that does not contain carbon and is bonded with a binding agent.