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Iron crucible composite coating for smelting aluminium alloy

A composite coating and aluminum alloy technology, applied in the field of composite coatings, can solve problems such as cracks in the coating layer and differences in thermal expansion coefficients, and achieve the effect of convenient operation.

Inactive Publication Date: 2012-05-23
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that there is a large difference in the thermal expansion coefficient between the coating composed of a single substance and a blending agent and the iron crucible, resulting in cracks in the coating layer, and to provide a composite coating for iron crucible for melting aluminum alloys

Method used

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  • Iron crucible composite coating for smelting aluminium alloy
  • Iron crucible composite coating for smelting aluminium alloy
  • Iron crucible composite coating for smelting aluminium alloy

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specific Embodiment approach 1

[0011] Specific Embodiment 1: In this embodiment, the iron crucible composite coating for smelting aluminum alloy is composed of thermally conductive aggregate, lubricating flow aid aggregate, refractory aggregate, thermal expansion buffer, binder and solvent, and the parts by weight of each component are as follows: 15-85 parts of heat-conducting aggregate, 25-45 parts of lubricating and flow-aiding aggregate, 18-48 parts of refractory aggregate, 8-25 parts of thermal expansion buffer, 2-12 parts of binder, and heat-conducting aggregate, lubricating and flow-aiding The volume ratio of total volume of aggregate, refractory aggregate, thermal expansion buffer and binder to solvent is 5:3.

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment differs from Embodiment 1 in that the thermally conductive aggregate is graphite powder. Others are the same as in the first embodiment.

[0013] The graphite powder described in this embodiment is commercially available.

specific Embodiment approach 3

[0014] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the lubricating flow aid aggregate is talcum powder. Others are the same as those in the first or second embodiment.

[0015] The talc powder described in this embodiment is commercially available.

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Abstract

The invention discloses an iron crucible composite coating for smelting an aluminium alloy, and relates to a composite coating. The iron crucible composite coating solves the problem in the prior art that the thermal expansion coefficients of a coating consisting of a single substance and a mobilizing agent and an iron crucible are quite different so as to cause cracks of the coating layer. The composite coating consists of heat conducting aggregate, lubricating and flow aiding aggregate, refractory aggregate, a thermal expansion buffering agent, an adhesive and a solvent. When the iron crucible composite coating for smelting the aluminium alloy is brushed, the crucible is not needed to be heated, the operation is carried out at room temperature, and the use is convenient. Besides, the composite coating is nontoxic, odourless, and harmless to human bodies, does not pollute environment, can automatically adjust thermal expansion stress, is changed along with the thermal expansion of the crucible in the heating process, avoids the cracks of the coating layer, effectively prevents aluminium liquid from corroding the crucible, and improves the service life of the iron crucible.

Description

technical field [0001] The invention relates to a composite paint. Background technique [0002] In industrial production, clay graphite crucibles, ceramic crucibles, and cast iron crucibles are generally used for melting aluminum and its alloys. Although clay-graphite crucibles and ceramic crucibles fundamentally eliminate the iron-increasing phenomenon of alloy liquids, they are limited due to expensive prices and low heat transfer rates. Cast iron crucibles are still dominant due to their cheap price and high heat transfer rate. The disadvantage of cast iron crucible is that it is easily corroded by molten aluminum, thus reducing the service life. Moreover, when the corrosion occurs, the harmful element iron enters the molten aluminum, causing the alloy to increase iron and destroy the material properties. In response to this phenomenon, people generally use the method of coating the inner surface of the crucible to improve the service life of the crucible and avoid th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 彭德林
Owner HARBIN INST OF TECH