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Method for repairing surface of copper roller of amorphous nanocrystalline crystallizer

A crystallizer copper repair method technology, applied in nanocrystalline crystallizer copper roll surface repair, amorphous field, can solve the problem of shortened mold life, lower production efficiency and product quality of amorphous alloy, matrix expansion and deformation, etc. Achieve excellent wear resistance and cold and heat fatigue resistance, improve production efficiency and product quality, and achieve uniform and dense coating thickness

Inactive Publication Date: 2013-09-18
QINGDAO YUNLU ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] To sum up, since the crystallizer is continuously in the environment of alternating cold and heat, when the copper material of the amorphous crystallizer body is used as a direct working surface in contact with molten steel, it will cause serious damage to the body of the amorphous crystallizer.
If the surface of the crystallizer is not modified in advance, in actual use, the heat alternating process on the surface of the crystallizer will be uneven, and the thermal stress and mechanical stress generated during casting will cause serious damage to the body of the amorphous crystallizer, making crystallization The service life of the device is shortened, which leads to an increase in the production cost of the amorphous alloy, and a reduction in the production efficiency and product quality of the amorphous alloy
[0004] The existing technology usually uses laser cladding, spraying, surfacing and other technologies to modify the surface of the crystallizer. The methods of laser cladding, thermal spraying, and surfacing will inevitably bring about damage to the coating material and the substrate due to high temperature. Deterioration of physical and chemical properties, oxidation of materials, high thermal stress of materials, expansion and deformation of substrates, etc.
Although the cold spray technology can avoid the above-mentioned problems caused by high temperature, the bonding strength between the coating and the substrate is not good, especially in the production process of amorphous alloys with severe alternating cold and heat, it is even more required that the coating and the crystallizer body have a good The bonding strength

Method used

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  • Method for repairing surface of copper roller of amorphous nanocrystalline crystallizer
  • Method for repairing surface of copper roller of amorphous nanocrystalline crystallizer
  • Method for repairing surface of copper roller of amorphous nanocrystalline crystallizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 single-layer coating—electroplating Ni-Co coating

[0035] 1. Carry out machining treatment on the surface of the copper roller of the amorphous and nanocrystalline crystallizer to remove the surface oxide layer and defect parts. And detect the size data of the removed crystallizer to determine the surface repair size of the crystallizer.

[0036] 2. Use alcohol to clean the oil and metal slag on the surface of the copper roller of the amorphous and nanocrystalline crystallizer, and then clean it with water. Use electroplating to wipe the surface of the substrate with a conventional alkaline degreasing solvent, the temperature of the solution is about 50°C, and then clean it with water. Electrolytic degreasing is performed on the surface of the copper roller of the amorphous and nanocrystalline crystallizer, and the copper roller of the amorphous and nanocrystalline crystallizer is immersed in the degreasing liquid, the degreasing temperature is 75°C, and ...

Embodiment 2

[0042] Embodiment 2 single-layer coating—electroplating Ni-Co gradient coating

[0043] The steps are the same as in Example 1, except that in step 3, the coating layer with a composition gradient structure is prepared by continuously changing the current density, and the current density is changed from 120mA / cm 2 down to 15mA / cm 2 , the gradient Ni-Co coating with increasing Co content from inside to outside is obtained.

[0044] The Ni-Co coating with gradient structure obtained according to the above process has a uniform and dense coating thickness, good bonding strength with the substrate, excellent wear resistance, thermal fatigue resistance, and good thermal conductivity. Demand for the production of amorphous and nanocrystalline ribbons.

Embodiment 3

[0045] Embodiment 3 single-layer coating—electroplating Ni-diamond composite coating

[0046] The steps are the same as in Example 1, except that in Step 3, this example is electroplating a Ni-diamond composite coating, the bath temperature is 45°C, and the current density is 35mA / cm 2 , the plating solution is stirred by air, and the diamond content in the obtained composite coating is about 10%, and a horizontal electroplating tank is used. The composition ratio of the electroplating solution is as follows:

[0047] Nickel sulfamate

300g / L

nickel chloride

20g / L

boric acid

30g / L

Diamond (0.5-1 micron)

10g / L

Sodium dodecyl sulfonate

0.1g / L

Dispersant

0.1g / L

[0048] The Ni-diamond composite coating obtained according to the above process has uniform thickness and compactness, and has good bonding strength with the substrate. Its wear resistance, cold and heat fatigue resistance are particularly excell...

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Abstract

The invention discloses a method for repairing a surface of a copper roller of an amorphous nanocrystalline crystallizer. The method comprises the steps as follows: an oxidation layer and a defect part on the surface of the copper roller of the amorphous nanocrystalline crystallizer are removed, and a reparation size is determined; proper pretreatment is performed on the surface of the copper roller of the crystallizer; the surface of the copper roller of the amorphous nanocrystalline crystallizer is plated with a plating; and electroplating is stopped when the plating reaches the reparation size, and the surface of the copper roller of the crystallizer is machined. The plating can be a single layer of a nickel base alloy; or pure nickel is taken as a pre-plating, and the pre-plating is plated with the nickel base alloy, so that double layers of the plating are formed; or the nickel base alloy is taken as the pre-plating, and the pre-plating is plated with the nickel base alloy and chromium, so that a plurality of layers of the plating are formed. The abrasion resistance and the cold and hot fatigue resistance of the crystallizer repaired with the method are excellent, the requirement for production of an amorphous nanocrystalline strip can be met, the production cost of the amorphous nanocrystalline strip is reduced, and the production efficiency and the product quality are improved.

Description

technical field [0001] The invention relates to the field of novel metal materials, in particular to a method for repairing the surface of a copper roller of an amorphous or nanocrystalline crystallizer. Background technique [0002] The basic principle of amorphous alloy production is rapid cooling and solidification, and the cooling rate must be greater than 10 5 -10 8 °C / s. The roller cover of the crystallizer must maintain a constant smoothness and geometric shape on the surface under the conditions of long-term pouring of molten steel and rising temperature. Therefore, the material thermal conductivity and hardness of the roll sleeve of the crystallizer must meet the requirements, and the material and the amorphous alloy to be prepared have good wettability. At present, in the process of amorphous alloy preparation, the surface temperature of the mold contacting the molten steel is about 600°C, and when the amorphous alloy is prepared by the crystallizer, the surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P6/00
Inventor 庞靖宋安康李晓雨张雪松
Owner QINGDAO YUNLU ENERGY TECH
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