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A thermal shock-resistant lining composite body for shrouds and its preparation process

A composite and anti-thermal shock technology, applied in the direction of manufacturing tools, casting equipment, metal processing equipment, etc., can solve the problems of difficult control and cumbersome process, and achieve the effect of reducing thermal stress, reducing thermal conductivity, and delaying temperature rise

Inactive Publication Date: 2018-05-11
LUOYANG INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the effect of this method is better, its technological process is more loaded down with trivial details and difficult to control

Method used

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  • A thermal shock-resistant lining composite body for shrouds and its preparation process
  • A thermal shock-resistant lining composite body for shrouds and its preparation process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A process for preparing a heat-shock-resistant lining composite body for shrouds. The lining composite body is composed of aggregate, light-burned alumina, high-temperature pre-synthesized material, magnesium carbonate and phenolic resin. The weight percentage of each material is: bone 40% of raw material, 10% of light-burned alumina, 40% of high-temperature pre-synthesized material, and 10% of magnesium carbonate. The amount of phenolic resin added is 8% of the total weight of aggregate, light-burned alumina, high-temperature pre-synthesized material and magnesium carbonate Among them, the high temperature presynthesis material is Al 2 o 3 -MgO-TiO 2 Synthetic material; the inner lining composite body contains Al 1.8 Mg 0.1 Ti 1.1 o 5 phase, including the following steps:

[0023] Step 1. According to the weight ratio of 1:3:3, weigh the microcapsule powder, titanium dioxide and absolute ethanol, mix them and disperse them ultrasonically at a frequency of 45KHz f...

Embodiment 2

[0028] A process for preparing a heat-shock-resistant lining composite body for shrouds. The lining composite body is composed of aggregate, light-burned alumina, high-temperature pre-synthesized material, magnesium carbonate and phenolic resin. The weight percentage of each material is: bone 40% of raw materials, 15% of light-burned alumina, 30% of high-temperature pre-synthesized materials, and 15% of magnesium carbonate. Among them, the high temperature presynthesis material is Al 2 o 3 -MgO-TiO 2 Synthetic material; the inner lining composite body contains Al 1.8 Mg 0.1 Ti 1.1 o 5 Mutually. Weigh the aggregate, light-burned alumina, high-temperature pre-synthesized material, magnesium carbonate and phenolic resin according to the weight percentage, mix and stir evenly, and place them in a granulator to make mixed granules, and pass the mixed granules through cooling etc. The static press presses the liner composite. Wherein, the preparation process of the aggregate...

Embodiment 3

[0030] A process for preparing a heat-shock-resistant lining composite body for shrouds. The lining composite body is composed of aggregate, light-burned alumina, high-temperature pre-synthesized material, magnesium carbonate and phenolic resin. The weight percentage of each material is: bone 50% of raw materials, 10% of light-burned alumina, 30% of high-temperature pre-synthesized materials, and 10% of magnesium carbonate. Among them, the high temperature presynthesis material is Al 2 o 3 -MgO-TiO 2 Synthetic material; the inner lining composite body contains Al 1.8 Mg 0.1 Ti 1.1 o 5 phase, including the following steps:

[0031] Step 1. According to the weight ratio of 1:3:3, weigh the microcapsule powder, titanium dioxide and absolute ethanol, mix them and disperse them ultrasonically at a frequency of 45KHz for 25min, and then carry out suction filtration under a vacuum condition of 0.098MPa , stop the suction filtration when there are no more ethanol droplets dripp...

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Abstract

The invention discloses a thermal shock resistant liner composite body for a long nozzle and a preparation process thereof. The liner composite body consists of 30-50% of aggregate, 10-15% of light roasting aluminum oxide, 30-50% of high-temperature pre-synthesized material, 10-15% of magnesium carbonate, and phenolic resin with an adding quantity being 6-10% of total weight of aggregate, light burning aluminum oxide, high-temperature pre-synthesized material and magnesium carbonate. The preparation process comprises the following steps: all the raw materials are weighed according to the weight percentages, are uniformly mixed, and are put in a pelletizer to prepare mixed particles; and the mixed particles are pressed to the liner composite body through a cold isostatic press. The liner composite body contains a lot of micropores uniformly distributed, so that the liner composite body is much lower in heat conductivity compared with a common Al2O3-C material. In addition, the liner composite body is excellent in thermal shock resistance.

Description

technical field [0001] The invention relates to a shroud for cast steel, in particular to a heat-shock-resistant lining composite body for a shroud and a preparation process thereof. Background technique [0002] The long nozzle is installed under the ladle, and the molten steel is poured into A1 of the tundish from the ladle 2 o 3 - C-quality cylindrical channel, which plays the role of guiding flow and preventing secondary oxidation and splashing of molten steel. It is an important functional refractory material to realize the protective casting of molten steel to improve the quality of billets, and its use will directly affect whether the entire continuous casting process can be carried out normally. However, in the early stage of molten steel pouring, when the hot molten steel flows through the long nozzle, a large thermal stress will be generated inside it, which will cause it to crack. Therefore, the shroud must be preheated to over 1000°C before use, which not only...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/54
CPCB22D41/54
Inventor 刘辉敏茹晓红肜芳珍
Owner LUOYANG INST OF SCI & TECH