Repairing method for surface of draught fan blade

A technology for surface repair and fan blades, applied in chemical instruments and methods, inorganic chemistry, coatings, etc., can solve problems affecting fan efficiency, erosion and wear of fan blades, etc., to reduce coating peeling or even failure, and reduce heat loss. Effects of stress and oxidation inhibition

Inactive Publication Date: 2017-10-17
安徽威龙再制造科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem in the prior art that the erosion and wear of the fan blades affects the e

Method used

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  • Repairing method for surface of draught fan blade
  • Repairing method for surface of draught fan blade
  • Repairing method for surface of draught fan blade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The fan blade surface repair method of this embodiment is applied to the repair of large fan blades, and the steps are:

[0061] Step 1, blade surface pretreatment:

[0062] A. Grind the worn parts of the blades, weld the damaged parts with new materials and then grind them, so that all parts meet the specified requirements;

[0063] B. Remove oil stains, rust stains, oxide skin and welding slag particles on the surface of the blade;

[0064] C. Clean the surface to be sprayed with detergent;

[0065] D. Perform magnetic particle inspection on all welds to ensure that there are no fatal defects such as cracks in the blades;

[0066] E. Roughen the blades before spraying to improve the adhesion of the coating;

[0067] Step 2. Preheating before spraying: place the blade in the preheating device for preheating treatment to eliminate moisture and moisture on the surface to be sprayed, increase the interface temperature between the sprayed particles and the workpiece, and ...

Embodiment 2

[0076] The fan blade surface repairing method of the present embodiment, basic steps are the same as embodiment 1, and difference and improvement are: in the E step of step one, carry out roughening treatment with 24# special-purpose corundum for thermal spraying; In step two, the preheated The temperature is controlled at about 80°C; in step 3, the base layer is made of NiAl material with a thickness of 0.08mm, which can eliminate the mismatch of the thermal expansion coefficient between the wear-resistant working layer and the base layer of the blade, so as to reduce the friction between the working layer and the blade. The thermal stress caused by the mismatch of the expansion coefficient of the base layer improves the mechanical matching and physical compatibility between the working layer and the blade base layer; the working layer is a WC-12Co composite coating with a thickness of 0.18mm;

[0077] After testing, the alloy coating prepared in Example 2 has strong adhesion,...

Embodiment 3

[0079] The basic steps of the method for repairing the surface of fan blades in this embodiment are the same as those in Embodiment 1. The differences and improvements are as follows: step 4, hole sealing treatment: the spraying method is used to carry out sealing treatment on the metal sprayed layer. When spraying, it should be diluted with ketone, aromatic hydrocarbon and absolute ethanol as diluent. After spraying, it should be dried in the air for 30-60 minutes, and fully cured in 1-5 hours.

[0080] The working layer adopts NiCr-Cr 3 C 2 Composite coating with a thickness of 0.20mm. NiCr alloy has excellent heat resistance, corrosion resistance, high temperature oxidation resistance and other properties, and also plays the role of bonding phase. Cr 3 C 2 It has good high-temperature hardness and high-temperature oxidation resistance, and acts as a hard phase. In the coating, it also mainly plays the role of dispersion strengthening of the second phase particles, which c...

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Abstract

The invention discloses a repairing method for the surface of a draught fan blade and belongs to the technical field of draught fan repairing. According to the repairing method for the surface of the draught fan blade, the method comprises the steps of blade surface pre-treatment, preheating before spraying, preparation before material spraying, ultrasonic spraying and hole sealing treatment. According to a spraying material, an NiAl material is chosen and used to conduct bottoming, and the problem that the material thermal expansion coefficients of an abrasion-resisting work layer and a blade base layer are not matched can be solved, so that thermal stress caused by the fact that the expansion coefficients of the work layer and the blade base layer are not matched is reduced, and the mechanical matching and physical compatibility between the work layer and the blade base layer are improved. The work layer is a WC-12Co composite coating or an NiCr-Cr3C2 composite coating. According to the repairing method for the surface of the draught fan blade, by optimizing the repairing steps, multi-element alloy coating components and distribution, the good erosion and abrasion resistance performance is achieved, and the technical problem that the efficiency of a draught fan is affected due to draught fan blade erosion and abrasion is solved.

Description

technical field [0001] The invention relates to the technical field of fan repair, in particular to a method for repairing the surface of fan blades. Background technique [0002] Wear is one of the three main causes of failure of metal parts (wear, corrosion and fatigue). The economic loss it causes is very huge, such as the figure announced by the United States in 1981, the annual loss due to wear and tear is as high as 100 billion US dollars. Among them, the material consumption is about 20 billion US dollars, which is equivalent to 7% of the annual output of materials. Due to the poor wear resistance of materials, the lost life of a large number of basic parts in my country is generally much lower than that of foreign advanced products, so the direct and indirect economic losses are also very alarming. According to the incomplete statistics of the five industrial sectors of metallurgy, mining, agricultural machinery, coal, electric power, and building materials, the sp...

Claims

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Application Information

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IPC IPC(8): C23C4/08C23C4/06C23C4/18C23C4/129C01B32/914B82Y40/00
CPCB82Y40/00C23C4/06C23C4/08C23C4/18C23C4/129
Inventor 凤国保李志忠
Owner 安徽威龙再制造科技股份有限公司
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