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Preparation method of molten aluminum wetting resistant aluminium nitride castable

An anti-aluminum liquid and aluminum nitride technology is applied in the field of refractory materials. Good anti-aluminum wettability, improving the effect of not being wetted by molten aluminum

Active Publication Date: 2014-09-17
广东鸿劲金属铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing materials in this part have poor wettability against aluminum liquid, and are easy to contaminate the composition of aluminum liquid, resulting in unqualified composition of aluminum alloy products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: Anti-aluminum liquid wetting aluminum nitride castable consists of 8mm-0mm aluminum nitride particles 69wt%, 4 0.4wt%, TiB 2 0.2wt%, SrTiO 3 0.2wt%, Na 3 AlF 6 0.2wt%); and add 0.12% of the total weight of the raw material sodium tripolyphosphate and 0.03% of the polycarboxylate as a dispersant; when preparing, first use the anti-aluminum liquid wetting agent and aluminum nitride with a particle size of <0.044mm The fine powder raw materials are pulverized in a vibration mill for 30 minutes; make the anti-aluminum liquid wetting agent and aluminum nitride fine powder fully homogenized in advance to make a homogenized powder, and then press the homogenized powder into the anti-aluminum liquid wetting agent and aluminum nitride The proportion of the fine powder in the aluminum nitride refractory castable is 22wt% and the other components are mixed uniformly. Approximately 5wt% aluminum sol is added during construction and mixing, and the mixing is uniform. It i...

Embodiment 2

[0016] Example 2: Anti-aluminum liquid wetting aluminum nitride castable made of 8mm-0mm aluminum nitride particles 66wt%, 4 1.6wt%, TiB 2 0.8wt%, SrTiO 3 0.8wt%, Na 3 AlF 6 0.8wt%); and add 0.12% of the total weight of the raw materials sodium tripolyphosphate and 0.03% of polycarboxylate as a dispersant; the preparation process is the same as in Example 1, and about 6wt% of aluminum sol is added during construction and mixing, and the mixing is uniform , Vibration pouring at the furnace site, and use after conventional curing and baking.

Embodiment 3

[0017] Example 3: Anti-aluminum liquid wetting aluminum nitride castable is made of 8mm-0mm aluminum nitride particles 65wt%, 4 1.6wt%, TiB 2 0.8wt%, SrTiO 3 0.8wt%, Na 3 AlF 6 0.8wt%); and add 0.12% of the total weight of the raw materials sodium tripolyphosphate and 0.03% of polycarboxylate as a dispersant; the preparation process is the same as in Example 1, and about 8wt% of aluminum sol is added during construction and mixing, and the mixing is uniform , Vibration pouring at the furnace site, and use after conventional curing and baking.

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Abstract

The invention belongs to the field of refractory materials and relates to a preparation method of a molten aluminum wetting resistant aluminium nitride castable. The castable comprises the following raw materials by weight percent: 63-69wt% of aluminium nitride particles with sizes of 8-0mm, 18-21wt% of aluminium nitride fine powder with particle size less than 0.044mm, 4-7wt% of pure calcium aluminate cement with particle size less than 0.074mm and 5-6wt% of silicon dioxide micro powder with D90 equivalent to 0.1mu m. The castable is characterized in that a compound of BaSO4, TiB2, SrTiO3 and Na3AlF6 is adopted as a molten aluminum wetting resisting agent; the addition of the compound is 1-6wt%; 0.12% of sodium tripolyphosphate and 0.03% of sodium hexametaphosphate are added as dispersing agents; alumina sol serves as construction liquid. The prepared castable has enough strength, excellent thermal shock resistance and good volume stability and chemical stability, is mainly resistant to molten aluminum wetting, has good thermal stability, is resistant to molten aluminum corrosion, does not affect the components of molten aluminium and has long service life.

Description

Technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a preparation method of aluminum nitride castables resistant to liquid aluminum wetting. Background technique [0002] The non-ferrous industry produces large-scale aluminum alloy ingots, as well as further processing aluminum strips, aluminum foils and other products that require high control accuracy of aluminum alloy components. As the key equipment of aluminum alloy deep processing projects, large-scale aluminum smelting furnace lining materials, especially the lining materials used in the bottom of the aluminum inlet sloping groove, sidewalls, and aluminum troughs of the aluminum smelting furnace, can control the composition of aluminum alloy. Plays an important role. Liquid aluminum not only contains elements such as magnesium, silicon and zinc with high chemical activity, but also has excellent fluidity. Its viscosity at 750°C is only 0.104 Pa·s, which is similar to th...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/581
Inventor 汤炼芳
Owner 广东鸿劲金属铝业有限公司
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