Iron-based crucible protection composite coating for refined aluminum purification

A composite coating and crucible technology, which is applied in the field of metallurgy, can solve problems such as thermal expansion coefficient coating layer cracks, and achieve the effects of improving service life, avoiding pollution, and high bonding strength

Active Publication Date: 2015-09-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that cracks occur in the paint layer due to the large difference in thermal expansion coefficient between the paint composed of a single substance and a compounding agent and the iron crucible, the present invention proposes an iron-based crucible protective composite coating for refined aluminum purification, which has high strength, High density and easy release performance

Method used

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  • Iron-based crucible protection composite coating for refined aluminum purification
  • Iron-based crucible protection composite coating for refined aluminum purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment includes the following steps:

[0038] 1) Prepare the isolation layer, the specific steps are as follows:

[0039] a. Weigh 15% of aluminum oxide, 15% of aluminum dihydrogen phosphate and 70% of water by weight percentage, add aluminum dihydrogen phosphate and aluminum oxide powder into the water, and ball mill for half an hour to mix evenly to obtain the isolation layer slurry.

[0040] b. Thoroughly remove rust and dirt on the surface of a cast iron crucible to be coated with dilute acid, then heat it to 200-300°C and keep it warm for 1 hour.

[0041] c. Spray the slurry prepared in step a evenly on the inner wall of the crucible with a thickness of 0.2mm.

[0042] d. Carry out curing heat treatment at 80-120°C for 24 hours and 350-500°C for 1 hour to obtain the isolation layer.

[0043] 2) Prepare the anti-friction layer, the specific steps are as follows:

[0044] a. Weigh 20% of boron nitride, 5% of aluminum dihydrogen phosphate, 5% of polyvinyl ...

Embodiment 2

[0048] This embodiment includes the following steps:

[0049] 1) Prepare the isolation layer, the specific steps are as follows:

[0050] a. Weigh 18% of aluminum oxide, 12% of aluminum dihydrogen phosphate and 70% of water by weight percentage, add aluminum dihydrogen phosphate and aluminum oxide powder into the water, and ball mill for half an hour to mix evenly to obtain the isolation layer slurry.

[0051] b. Thoroughly remove rust and dirt on the surface of a cast iron crucible to be coated with dilute acid, then heat it to 200-300°C and keep it warm for 1 hour.

[0052] c. Spray the slurry prepared in step a evenly on the inner wall of the crucible with a thickness of 0.2mm.

[0053] d. Carry out curing heat treatment at 80-120°C for 24 hours and 350-500°C for 1 hour to obtain the isolation layer.

[0054] 2) Prepare the anti-friction layer, the specific steps are as follows:

[0055]a. Weigh 25% of boron nitride, 5% of aluminum dihydrogen phosphate, 5% of polyvinyl a...

Embodiment 3

[0059] This embodiment includes the following steps:

[0060] 1) Prepare the isolation layer, the specific steps are as follows:

[0061] a. Weigh 20% of alumina, 10% of aluminum dihydrogen phosphate and 70% of water by weight percentage, add aluminum dihydrogen phosphate and alumina powder into the water, and ball mill for half an hour to mix evenly to obtain the isolation layer slurry.

[0062] b. Thoroughly remove rust and dirt on the surface of a cast iron crucible to be coated with dilute acid, then heat it to 200-300°C and keep it warm for 1 hour.

[0063] c. Spray the slurry prepared in step a evenly on the inner wall of the crucible with a thickness of 0.2 mm.

[0064] d. Carry out curing heat treatment at 80-120°C for 24 hours and 350-500°C for 1 hour to obtain the isolation layer.

[0065] 2) Prepare the anti-friction layer, the specific steps are as follows:

[0066] a. Weigh 30% of boron nitride, 5% of aluminum dihydrogen phosphate, 5% of polyvinyl alcohol and 6...

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Abstract

An iron-based crucible protection composite coating for refined aluminum purification comprises an isolation layer and an abrasion reduction layer. The isolation layer comprises aluminum oxide serving as refractory aggregates and aluminum dihydrogen phosphate serving as bonding agents. The abrasion reduction layer comprises boron nitride serving as refractory aggregates, polyvinyl alcohol serving as thermal expansion buffering agents and aluminum dihydrogen phosphate serving as bonding agents. By means of the composite coating, the problem of cracks of acoating layer caused by large differences between thermal expansion coefficients of coatings formed by single substance and blending agents and the iron crucible in the prior art is solved. The composite coating has the advantages that the strength and the compactness are high, and de-molding can be performed easily.

Description

technical field [0001] The invention relates to a technology in the field of metallurgy, in particular to an iron-based crucible protective composite coating for refining aluminum. Background technique [0002] During the smelting process of aluminum and aluminum alloys, crucibles are required to contain high-temperature molten aluminum. Crucible material has great influence on production cost, production efficiency and product quality. The commonly used crucible materials are graphite clay crucible, ceramic crucible and iron crucible. The advantage of graphite clay crucibles and ceramic crucibles is that they can fundamentally eliminate the iron-increasing phenomenon of molten aluminum. However, due to the low thermal conductivity of non-metallic materials, poor high-temperature strength, low surface strength and hardness, difficult manufacturing, and high prices, other reasons Application is limited. The cost of iron crucibles is relatively low. At the same time, this t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/38B05D3/02C03C8/00F27B14/10
Inventor 孙宝德张佼万祥辉东青李飞韩延峰董安平
Owner SHANGHAI JIAO TONG UNIV
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