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Preparation method of enhanced ultra-low carbon Al2O3-ZrO2-SiC-C refractory material

A refractory and ultra-low carbon technology is applied in the field of preparation of enhanced ultra-low carbon Al2O3-ZrO2-SiC-C refractory materials, which can solve the problems of thermal shock resistance and erosion resistance of refractory products, and achieves It is beneficial to mass production, the process is simple and easy, and the effect of enhancing the compressive strength

Active Publication Date: 2017-12-01
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And low carbon / ultra-low carbon Al 2 o 3 -C or carbon-free refractories due to the reduction of graphite content, and without the addition of thermal shock-resistant components such as fused silica and silicon carbide, the thermal shock resistance and erosion resistance of refractory products are significantly reduced

Method used

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  • Preparation method of enhanced ultra-low carbon Al2O3-ZrO2-SiC-C refractory material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A kind of enhanced ultra-low carbon Al 2 o 3 -ZrO 2 -The preparation method of SiC-C refractory material, carry out according to the following steps:

[0040] Step 1: Pre-synthesis of ZrO 2 -SiC composite fine powder

[0041] (1) The raw material zircon (ZrO 2 and SiO 2 The mass fractions are respectively 66% and 33%), activated carbon (chemical reagent), and yttrium oxide (chemical reagent) powder, which are accurately weighed and fully ball-milled according to the experimental ratio (100:20:1.9);

[0042] (2) Press the ball-milled raw materials into the sample;

[0043] (3) After fully drying the sample at 120°C, put it into a graphite crucible, and place it in a high-temperature furnace at 1600°C for 2 hours to carry out carbothermal reduction reaction to synthesize composite micropowder.

[0044]Step 2: Ultra Low Carbon Al 2 o 3 -ZrO 2 - Preparation of SiC-C refractory samples

[0045] (1) The raw materials fused white corundum aggregate and fine powder...

Embodiment 2

[0052] A kind of enhanced ultra-low carbon Al 2 o 3 -ZrO 2 -The preparation method of SiC-C refractory material, with embodiment 1, difference is, w(ZrSiO 4 +C) is 15%.

[0053] After testing, the resulting ultra-low carbon Al 2 o 3 -ZrO 2 -The main crystal phase of SiC-C refractories is still Al 2 o 3 , ZrO 2 and SiC, ZrO 2 Mainly c-ZrO 2 and t-ZrO 2 Form exists; ZrO 2 The diffraction intensity is obviously enhanced, and the diffraction intensity of corundum is reduced; adding La to the sample 2 o 3 Afterwards, a plate-shaped LaAl was formed inside the sample. 11 o 18 ; A large amount of plate-like Al can be observed in the sample 2 o 3 -LaAl 11 o 18 The composite body, which is distributed among the corundum particles, greatly improves the normal temperature compressive strength of the refractory matrix, which is as high as 62MPa, which is about 6.2 times that of the sample without additives.

Embodiment 3

[0055] A kind of enhanced ultra-low carbon Al 2 o 3 -ZrO 2 - The preparation method of the SiC-C refractory material is the same as in Example 1, except that the high-temperature sintering temperature is 1500° C. for 3 hours.

[0056] After testing, the resulting ultra-low carbon Al 2 o 3 -ZrO 2 -The main crystal phase of SiC-C refractories is still Al 2 o 3 , ZrO 2 and SiC, ZrO 2 Mainly c-ZrO 2 and t-ZrO 2 form; add La to the sample 2 o 3 Afterwards, a plate-shaped LaAl was formed inside the sample. 11 o 18 ; A large amount of plate-like Al can be observed in the sample 2 o 3 -LaAl 11 o 18 The composite body, which is distributed among the corundum particles, greatly improves the normal temperature compressive strength of the sample, which is as high as 68MPa, which is about 6.8 times that of the sample without additives.

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Abstract

The invention relates to a preparation method of an enhanced ultra-low carbon Al2O3-ZrO2-SiC-C refractory material, belonging to the technical field of preparation of refractory materials for clean steel metallurgy. The preparation method concretely comprises the following steps: carrying out full ball-milling on zircon, activated carbon and yttrium oxide powder according to an experimental proportion, carrying out compression molding, and then carrying out heat preservation for 2h at the temperature of 1600 DEG C so as to synthesize ZrO2-SiC composite powder in advance; after that, evenly mixing fused white corundum aggregate with fine powder, alpha-Al2O3, zircon and activated carbon, the ZrO2-SiC composite powder synthesized in advance, natural graphite, solid phenolic resin, additives-rare earth oxides, and the like according to a certain ratio, and molding to produce a biscuit having a certain size; finally, putting the obtained biscuit into a high temperature furnace with protective atmosphere for sintering so as to obtain the ultra-low carbon Al2O3-ZrO2-SiC-C refractory material. The method provided by the invention enhances the mechanical properties and thermal shock resistance of the refractory material under the premise of reducing the carbon content of an Al2O3-C refractory material. The method is simple in technology, easy to implement, low in price of raw materials and easy in obtaining of the raw materials, and can easily realize mass production.

Description

technical field [0001] The invention belongs to the technical field of preparing refractory materials for clean steel metallurgy, and relates to a reinforced ultra-low carbon Al 2 o 3 -ZrO 2 - Preparation method of SiC-C refractory material. Background technique [0002] With the continuous development of the steel industry, the quality and performance requirements of steel are getting higher and higher, and the production of low-cost and high-efficiency clean steel has become the focus of future steel development. The production of high-clean steel is not only related to the smelting process, but also closely related to the quality of related refractory materials. [0003] Al 2 o 3 -C refractories have the characteristics of high strength and refractoriness, excellent slag erosion resistance, etc., and are widely used in steelmaking and continuous casting processes. However, Al 2 o 3 The carbon content of -C refractories is generally higher than 8%, which will incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10
CPCC04B35/10C04B35/66C04B2235/3227C04B2235/3246C04B2235/3826C04B2235/422C04B2235/96C04B2235/9607
Inventor 马北越张亚然苏畅李世明于景坤
Owner NORTHEASTERN UNIV LIAONING