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Plasma transfer arc spraying method for strengthening inner wall of cylinder sleeve of heavy truck

A heavy-duty truck, plasma technology, applied in wear-resistant and corrosion-resistant coatings, engineering and material science, can solve the problems of easy cavitation, wear and corrosion of the outer wall, and achieve the effect of high degree of mechanical automation, low cost and simple operation

Active Publication Date: 2017-03-22
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a remanufacturing method of a cylinder liner. Aiming at the disadvantages that the inner wall of the cylinder liner is easy to wear and corrode and the outer wall is easy to cavitate, a high-performance wear-resistant coating is prepared on the inner wall by using an inner hole plasma spray gun, and the supersonic plasma spray gun is excellent in preparing the outer wall. Anti-corrosion coating

Method used

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  • Plasma transfer arc spraying method for strengthening inner wall of cylinder sleeve of heavy truck
  • Plasma transfer arc spraying method for strengthening inner wall of cylinder sleeve of heavy truck

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Clean the cylinder liner 5 of the truck with acetone to remove oil and impurities, and immediately dry it with compressed air to prevent rust after cleaning.

[0042] 2. Use brown corundum with a particle size of 16 mesh to perform sand blasting roughening on the inner wall of the cleaned truck cylinder liner 5, and the roughness of the inner wall of the truck cylinder liner 5 after roughening is required to be Ra 2.0-3.0.

[0043]3. Use pure FeCrBSi with a diameter of 1.6mm (specific element weight percentage: 25-31% Cr, 1.0-1.5% B, 1.0-2.0% Si, 4.0-5.0% C, and the rest is Fe) to fill the welding wire of stainless steel sheath as Spray raw materials, use ABB manipulator to hold spray gun head 7, and the plasma gas flow rate of spray gun head 7 is 80SLPM Ar, 15SLPM H 2 , the carrier gas flow rate is 1200SLPM Air, the current is 120A, the spraying power is 12.5KW, the turntable speed is 25 rpm, the wire feeding speed is 10m / min, the spraying distance is 80mm, and the ...

Embodiment 2

[0049] The difference between this embodiment and embodiment 1 is: the welding wire flux core filling material selected in step 3 is FeCrBSi and 20% mass fraction Al 2 o 3 Mix evenly composite powder, in order to prevent FeCrBSi and Al 2 o 3 Different densities lead to delamination of the coating. The composite powder is bonded by adhesive method and then filled into the stainless steel sheath. In step 6, the porosity of the composite coating was 3.95%, and in step 7, under the same friction conditions, the friction coefficient of the coating was 0.71 and the wear rate was 0.68×10 -5 mm 3 / N·m.

Embodiment 3

[0051] The difference between this embodiment and embodiment 1 is that the filler material of the welding wire flux selected in step 3 is a composite powder uniformly mixed with FeCrBSi and 10% mass fraction Mo powder, in order to prevent the coating from being caused by the difference in density between FeCrBSi and Mo powder In the case of delamination, the composite powder is bonded by adhesive method and then filled into the stainless steel skin. The plasma gas flow rate of the spray gun is 75SLPM Ar, 10SLPM H 2 , the carrier gas flow is 1200SLPM Air, the current is 85A, and the spraying power is 8.6KW. In step 6, the porosity of the composite coating was 2.86%, and in step 7, under the same friction conditions, the friction coefficient of the coating was 0.62, and the wear rate was 0.75×10 -5 mm 3 / N·m.

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Abstract

The invention relates to a plasma transfer arc spraying method for strengthening the inner wall of a cylinder sleeve of a heavy truck. The plasma transfer arc spraying method for strengthening the inner wall of the cylinder sleeve of the heavy truck comprises the steps that the inner wall of the cylinder sleeve is cleaned, and brown fused alumina is used for sand blasting for roughening treatment; an iron-based cored wire is sprayed to the inner wall of the cylinder sleeve of the truck through plasma transfer arc spraying, so that an abrasion-resistant and corrosion-resistant coating is obtained, wherein the iron-based cored wire is provided with stainless steel skin, and a core is formed by using FeCrBSi or FeCrBSi as a metal base material and adding other materials as compound phases; and the obtained coating is honed through a diamond honing stick. By adoption of the plasma transfer arc spraying method for strengthening the inner wall of the cylinder sleeve of the heavy truck, the defects that frictional power consumption is high, abrasion and corrosion occur easily, the fuel efficiency is low, and tail gas combustion is incomplete are overcome; and the friction coefficient between a piston ring and the inner wall of the cylinder sleeve is decreased, fuel is saved, and the service cycle of an engine is remarkably prolonged.

Description

technical field [0001] The invention relates to engineering and material science, namely surface coating technology and the field of wear-resistant and corrosion-resistant coatings, in particular to a plasma transferred arc spraying method for strengthening the inner wall of a cylinder liner of a heavy-duty truck. Background technique [0002] The combustion chamber of a heavy-duty truck is generally composed of a cylinder liner, a cylinder head, a piston and a piston ring. Work under the action of abrasive medium. The inner wall of the cylinder liner is directly in contact with the high-temperature and high-pressure gas, and bears the reciprocating friction of the piston ring. As a result, the surface of the engine will wear out during the working process, resulting in poor airtightness between the piston and the cylinder, which will seriously affect the power performance and use of the locomotive. life. At the same time, the inner wall of the cylinder liner also bears th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06C23C4/02
CPCC23C4/02C23C4/06
Inventor 张超刘黎明葛庆徐海峰肖金坤
Owner YANGZHOU UNIV
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