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Preparation method of wear-resistant self-lubricating gradient coating for crane wheel

A gradient coating and powder spraying technology, which is applied in the coating, metal material coating process, fusion spraying, etc., can solve the problem of affecting the service life of the wear-resistant protective coating, the friction coefficient of the friction system is large, shrinkage cavities or blisters, etc. problems, to achieve the effect of retaining the content and uniform distribution of ingredients, reducing the friction coefficient and increasing the weight

Active Publication Date: 2022-05-27
XIAN SPECIAL EQUIP INSPECTION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(3) Local crushed depressions on the tread surface: due to the defects such as looseness, shrinkage cavities or sand holes in the interior of individual cast wheels during casting, surface pits and depressions will appear when the unit pressure increases, resulting in the scrapping of the wheel body
However, in the actual working environment, due to the high hardness of the molybdenum carbide coating, the friction coefficient of the friction system is relatively large, which will cause serious wear to the friction pair with it, and even affect the service life of the wear-resistant protective coating.

Method used

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  • Preparation method of wear-resistant self-lubricating gradient coating for crane wheel
  • Preparation method of wear-resistant self-lubricating gradient coating for crane wheel
  • Preparation method of wear-resistant self-lubricating gradient coating for crane wheel

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Embodiment 1

[0037] The preparation method of the wear-resistant self-lubricating gradient coating for crane wheels of the present embodiment includes the following steps:

[0038] Step 1. Molybdenum trioxide powder (MoO 3 The mass content is greater than 99%, the average particle size is less than 10 μm), and the drying temperature is 80 ° C and the time is 1 h to obtain dry powder; the dry powder is placed in a sintering furnace, and the sintering furnace is continuously passed through. The mixed gas of carbon monoxide and argon is added for sintering, the heating rate of sintering is 6°C / min, the sintering temperature is 900°C, and the holding time is 10min to obtain molybdenum carbide powder; the volume of carbon monoxide in the mixed gas of carbon monoxide and argon The percentage is 20%, and the balance is argon; the atmospheric pressure of the carbon monoxide and argon mixed gas is 0.2MPa;

[0039] Step 2, the graphene powder (commercially enhanced graphene, the specific surface ar...

Embodiment 2

[0053] The preparation method of the wear-resistant self-lubricating gradient coating for crane wheels of the present embodiment includes the following steps:

[0054] Step 1. Molybdenum trioxide powder (MoO 3The mass content is greater than 99%, the average particle size is less than 10 μm), and the drying temperature is 100 ° C and the drying time is 1.5 h to obtain dry powder; The mixed gas of carbon monoxide and argon is introduced for sintering, the heating rate of sintering is 7°C / min, the sintering temperature is 1000°C, and the holding time is 15min to obtain molybdenum carbide powder; The volume percentage is 30%, and the balance is argon; the atmospheric pressure of the carbon monoxide and argon mixed gas is 0.3MPa;

[0055] Step 2, the graphene powder (commercially enhanced graphene, the specific surface area is 180m 2 / g~280m 2 / g, the C content is 70% to 80%, the average particle size is less than 10 μm) and anhydrous ethanol are mixed uniformly, and then deion...

Embodiment 3

[0068] The preparation method of the wear-resistant self-lubricating gradient coating for crane wheels of the present embodiment includes the following steps:

[0069] Step 1. Molybdenum trioxide powder (MoO 3 The mass content is greater than 99%, the average particle size is less than 10 μm), and the drying temperature is 120 ° C and the drying time is 2 hours to obtain dry powder; the dry powder is placed in the sintering furnace, and the sintering furnace is continuously passed through. A mixed gas of carbon monoxide and argon is added for sintering, the heating rate of sintering is 8°C / min, the sintering temperature is 1100°C, and the holding time is 20min to obtain molybdenum carbide powder; the volume of carbon monoxide in the mixed gas of carbon monoxide and argon The percentage is 40%, and the balance is argon; the atmospheric pressure of the carbon monoxide and argon mixed gas is 0.4MPa;

[0070] Step 2, the graphene powder (commercially enhanced graphene, the specif...

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Abstract

The invention discloses a preparation method of a wear-resistant self-lubricating gradient coating for a crane wheel, comprising: 1. drying and sintering molybdenum trioxide powder to obtain molybdenum carbide powder; 2. preparing a graphene dispersion; 3. mixing molybdenum The precursor is added to the graphene dispersion, and after stirring evenly, the precipitate is suction-filtered and dried to obtain a dry powder; 4. The dry powder is sintered to obtain a modified graphene powder with nano-molybdenum carbide particles attached to the surface; 5. Preparation Molybdenum carbide / modified graphene mixed spray powder; 6. Use molybdenum carbide / modified graphene mixed spray powder to carry out supersonic flame spraying on the outer edge surface of the crane wheel. The self-lubricating gradient coating prepared by the invention has extremely high wear resistance and self-lubricating properties. When used for crane wheel rim protection, the coating material shows excellent wear resistance and self-lubricating properties, which can meet the requirements of crane wheel rim protection. Due to the requirements of the working environment, it has a good application prospect in this field.

Description

technical field [0001] The invention belongs to the technical field of thermal spraying treatment, and in particular relates to a preparation method of a wear-resistant self-lubricating gradient coating for crane wheels. Background technique [0002] The wheel wear problem during the operation of the crane is mostly caused by the problem of the crane wheel gnawing on the rail or the phenomenon. The problem of the crane wheel gnawing on the rail will not only cause the crane wheel to be damaged, but also the wear resistance generated by the wheel gnawing on the rail. During the operation of the crane, certain noises are generated, and even lead to unsafe problems such as derailment during the operation of the crane. During the production and operation of the crane, the main reasons for the failure of the wheel gnawing on the rail are that the wheel installation of the crane equipment is unreasonable, or the installation quality of the crane equipment operating rail is not up ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/129C23C4/04
CPCC23C4/129C23C4/04
Inventor 丁勇刘金娥贠科鲁元毕成杨旭
Owner XIAN SPECIAL EQUIP INSPECTION INST
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