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Preparation method of remanufactured coating for inner wall of air cylinder sleeve

A cylinder liner and remanufacturing technology, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of material selection and processing technology without breakthrough, and achieve material cost saving, low environmental pollution, and material good selectivity

Inactive Publication Date: 2017-01-11
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent is limited to size repair, and has not achieved breakthroughs in material selection and processing technology

Method used

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  • Preparation method of remanufactured coating for inner wall of air cylinder sleeve
  • Preparation method of remanufactured coating for inner wall of air cylinder sleeve
  • Preparation method of remanufactured coating for inner wall of air cylinder sleeve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 20g of Al with a particle size of about 20μm 2 o 3 The powder is evenly mixed with 180g of NiCrBSi powder with a particle size of 40-50μm, bonded by gluing, put into the powder feeder tube 7, and the powder feeding rate is controlled at 30g / min, and sent into the plasma flame flow, and deposited on the inner wall of the cylinder liner to form For composite coating, too much or too little powder feeding will lead to unmelting or overoxidation during the powder feeding process, which will directly affect the spraying quality and coating thickness. Spraying parameters are set to H 2 The flow rate is 7L / min, the Ar flow rate is 40L / min, the current is 500A, and the voltage is 56V. In order to ensure uniform coating and controllable thickness, the moving speed of the spray gun is set at 200mm / s, moving down 3mm each time, and spraying continuously for 6 times. The phase structure was observed with an X-ray diffractometer. Such as figure 2 As shown, the coating contains...

Embodiment 2

[0051] 40g of Al with a particle size of about 20μm 2 o 3 The powder is evenly mixed with 160g of NiCrBSi powder with a particle size of 40-50μm, due to Al 2 o 3 The density is smaller than alloy powders such as NiCrBSi, Al 2 o 3 The mass ratio is controlled at 10%-30% to prevent the self-fluxing property of the obtained coating from being poor due to excessive content, which reduces the quality of the coating. After bonding by adhesive method, it is sent to the spraying device, and the powder feeding amount is controlled to be 35g / min. Into the plasma flame flow, deposited on the inner wall of the cylinder liner to form a composite coating. h 2 The flow rate is 5L / min, the Ar flow rate is 40L / min, the current is 500A, and the voltage is 56V. The moving speed of the spray gun is 200mm / s, moving down 3mm each time, due to the large amount of powder feeding, the number of spraying is appropriately reduced to control the thickness of the obtained coating, and the spraying i...

Embodiment 3

[0053] Compared with NiCrBSi, FeCrBSi has lower cost and is more suitable for industrial mass production. Combining FeCrBSi with Al 2 o 3 Mix uniformly with a mass ratio of 8:2, and send it into the flame flow of a flame spray gun after being glued, and deposit on the substrate to form a metal-ceramic composite coating. The gas used in the spray gun is oxygen and acetylene, and its combustion temperature can reach 3000 ° C, which fully meets the requirements of FeCrBSi and Al 2 o 3 The melting temperature of the material, the moving speed of the spray gun is 150mm / s, each time moving down 2mm, continuous spraying 15 times. The cross-sectional morphology was observed with a Veka microscope, such as Figure 4 As shown, the thickness of the coating is about 150 μm, the dispersion is uniform, the bonding of the layer and the base is good, and it meets the high-strength wear resistance test.

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Abstract

The invention relates to a preparation method of a remanufactured coating for the inner wall of an air cylinder sleeve. According to the preparation method, a thermal spraying mode is adopted; a base body of the inner wall of the air cylinder sleeve of a vehicle is remanufactured from a powdered material; the base body is made of carbon steel or stainless steel or other types of metal; the spraying powdered material is a metallic-nonmetallic composite and composite powder; after entering flame flow, the composite powder is deposited onto the base body through all or part of fusion and acceleration processes; and the composite powder is sprayed to the inner wall of the air cylinder sleeve of the vehicle, so that the composite coating is formed. By means of the method, defects existing in previous various air cylinder sleeve restoration methods are overcome. The thermal spraying method is adopted, and the high-performance composite coating is remanufactured on the inner wall of the cylinder sleeve; the service life of an engine of the vehicle is recovered; a mixed power gluing method is adopted in the spraying process, and the coating lamination phenomenon caused by density variation of the composite powder is effectively avoided; it is helpful to improve performance of the coating; and the service life of the coating is prolonged to a large extent.

Description

technical field [0001] The invention relates to engineering and material science, in particular to a method for preparing a remanufactured coating on the inner wall of a cylinder liner. Background technique [0002] As an important part of the engine, the cylinder liner is the most vulnerable to damage, and it is very necessary to reduce or reduce the damage. The most common failure mode of engine cylinder liner is wear failure, which mainly includes abrasive wear, corrosion wear and adhesive wear. Therefore, it is believed that no matter what type of internal combustion engine, the requirements for its cylinder liner are basically the same, that is, the inner surface of the cylinder liner must meet high anti-wear performance, low friction coefficient with the piston ring, corrosion resistance, and corrosion resistance. Abrasiveness and sufficient tensile strength, etc. [0003] Before the present invention, people adopt many ways to try to improve its wear resistance etc....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/129C23C4/06
CPCC23C4/06
Inventor 张超吴庆丹刘黎明徐海峰肖金坤
Owner YANGZHOU UNIV
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