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Oxide and non-oxide composite integral stopper rod

A non-oxide and oxide technology, which is applied in the direction of casting molten material containers, metal processing equipment, casting equipment, etc., can solve problems such as difficulty in meeting actual needs, easy turning of stopper rods, excessive erosion, etc., and achieve excellent anti-calcium treatment, Improved service life and high thermal conductivity

Inactive Publication Date: 2012-06-13
北京利尔高温材料股份有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the extension of the casting time and the deterioration of the casting conditions, the common magnesium carbon material has a large amount of erosion and excessive erosion during use, which is difficult to meet the actual needs
Moreover, due to the difference in thermal expansion between magnesium-carbon and aluminum-carbon materials, the stopper rod is easy to turn around and the tip of the rod is broken during use. Therefore, seeking a magnesium-carbon material with low expansion and high erosion resistance will improve the overall stopper rod. life expectancy is positive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Rod head: 80% fused magnesia, 8% graphite, 10% Sialon, 2% metal silicon powder, plus 10% phenolic resin. After granulation and drying, it is compounded with aluminum-carbon rod body, and after isostatic pressing, it is fired at a temperature of 900°C in a non-oxidizing atmosphere. It has been used for 16 hours. During the use, the flow control is good. After use, the closing condition is very good, and there is no phenomenon of flowing steel or flowing steel.

Embodiment 2

[0018] Rod head: 65% fused magnesia, 12% graphite, 20% Sialon, 3% metal silicon powder, plus 10% phenolic resin. After granulation and drying, it is compounded with aluminum-carbon rod body, and after isostatic pressing, it is fired at a temperature of 1100°C in a non-oxidizing atmosphere. It has been used for 12 hours. During use, the flow control is good. After use, the closure is very good, and there is no phenomenon of steel flowing or flowing.

Embodiment 3

[0020] Rod head: fused magnesia 70%, graphite 8%, sialon 10%, aron 10%, metal aluminum powder 2%, plus phenolic resin 10%. After granulation and drying, it is compounded with aluminum-carbon rod body. After isostatic pressing, it is fired at a temperature of 1000°C in a non-oxidizing atmosphere. It has been used for 22 hours. During use, the flow control is good. After use, the closure is very good, and there is no phenomenon of flowing steel or flowing steel.

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Abstract

The invention belongs to the field of novel refractory materials with a continuous casting function, and provides an oxide and non-oxide composite integral stopper rod for continuous casting. The rod body of the integral stopper rod is made of an aluminum-carbon material; the head of the stopper rod is made of an oxide and non-oxide composite material; the space between the rod head and the rod body is formed by a mixed transition material between the rod head and the rod body; and the rod head comprises 65 to 80 percent of electric melting magnesia serving as a main raw material and is added with 5 to 20 percent of non-oxide, 7 to 12 percent of graphite and 8 to 12 percent of phenolic resin. According to the stopper rod, the molten steel scouring and corrosion resistance of the rod head material during use is improved by adding the non-oxide, appropriately reducing the content of the graphite and fully utilizing the advantages of high melting point, low thermal expansion rate, high thermal shock stability and difficulty in molten steel infiltration of the non-oxide.

Description

Technical field [0001] The invention belongs to the field of novel continuous casting functional refractory materials and provides a method for manufacturing an oxide-non-oxide composite integral stopper for continuous casting. Background technique [0002] The integral stopper is used in the continuous casting tundish. Its main function is to control the opening, closing and crystallization of the tundish by adjusting the fit gap between the integral stopper head and the integral submerged nozzle or the bowl of the upper nozzle of the tundish. The steel flow of the device is used to ensure the stability of the liquid level of the molten steel in the mold and the stability of the continuous casting process. The use conditions of the stopper are very harsh, not only to withstand high-temperature gas baking, strong thermal shock and severe erosion at the initial stage of steel pouring, but also to withstand the erosion of molten steel and covering agent. [0003] At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/18
Inventor 鄢凤明王次明赵伟任林胡玲军樊浩勇赵传亮刘靖轩张艳凤
Owner 北京利尔高温材料股份有限公司
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