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Diamond-like coating piston ring with double transition layers

A technology of diamond coating and transition layer, which is applied in the field of piston rings, can solve the problems of surface coating failure, uneven stress release, and carbon coating layer collapse, so as to improve the bonding effect, relieve peeling, and improve Effect of Hardness Gradient

Pending Publication Date: 2021-10-26
ANQING TP GOETZE PISTON RING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. In the prior art, due to the uneven stress release of the carbon coating on the surface of the piston ring, the carbon coating is prone to film collapse during use, resulting in the inability of the surface coating to effectively reduce friction loss. Effect

Method used

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  • Diamond-like coating piston ring with double transition layers
  • Diamond-like coating piston ring with double transition layers
  • Diamond-like coating piston ring with double transition layers

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0054] The preparation method of above-mentioned piston ring comprises the steps:

[0055] The first step is to roughen the piston ring base 1 and perform degreasing and hydrocarbon cleaning;

[0056] In the second step, the treated piston ring base 1 is clamped, wiped and then loaded into a furnace;

[0057] The third step is to add the piston ring substrate 1 treated in the second step into the vacuum coating equipment, vacuumize to the set vacuum degree after sealing, perform ion cleaning on the piston ring substrate 1 after preheating, stop heating and let it stand 0.5h to a temperature of 90-100°C;

[0058] The preheating time is 20min, and the preheating temperature is 120°C;

[0059] The fourth step is to prime the chromium target and then the titanium target. The conditions for chromium target shooting are 1~2h, 110~130°C, and the conditions for titanium target shooting are 1.5~3h, 110~130°C, and then proceed Alternate coating of hard carbon coating and soft carbon ...

Embodiment 1

[0062] In a specific embodiment of the present application, the carbon coating 4 includes ten groups of soft carbon coatings and hard carbon coatings combined with each other, wherein the hard carbon coating is along the direction from the inside to the outside of the piston ring. The hardnesses are 1800, 1920, 2040, 2160, 2280, 2400, 2520, 2640, 2760, 2880; the hardness of the soft carbon coating along the piston ring from inside to outside is 1300, 1350, 1400, 1450, 1500, 1550, 1600, 1650, 1700;

[0063] Carry out ball milling test to the carbon coating of above-mentioned molding, test result sees figure 2 ;

[0064] The conditions of the ball milling test are: grind the coating for 10 minutes with a diamond powder abrasive with a thickness of 1 to 2 microns, and then grind with a diamond powder abrasive with a thickness of 0.25 to 0.5 microns for 20 minutes. The grinding angle: 45° to 60° with the horizontal line .

Embodiment 2

[0066] A double transition layer diamond-like coating piston ring, comprising a piston ring base 1 and a transition layer bonded to the piston ring base 1, and also including a carbon coating 4 bonded to the surface of the transition layer;

[0067] The transition layer includes chromium coating 2 and titanium coating 3 combined with each other, wherein the thickness of chromium coating 2 is 150nm, and the thickness of titanium coating 3 is 350nm;

[0068] The distribution of carbon coating 4 is the same as in Example 1

[0069] Wherein the chromium coating 2 is combined with the piston ring substrate 1, the hard carbon coating in the carbon coating 4 is combined with the titanium coating 3, and the total thickness of the carbon coating 4 is 8 μm;

[0070] Test formed piston rings:

[0071] Electron microscope image of the transition layer and carbon coating 4 of the formed piston ring image 3 shown;

[0072] The SEM structure spectrum of the DLC coating of the formed pist...

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Abstract

The invention discloses a diamond-like coating piston ring with double transition layers. The diamond-like coating piston ring comprises a piston ring base body, the transition layers and a carbon coating, wherein the transition layers comprise a chromium coating and a titanium coating which are combined with each other; and the carbon coating comprises at least one group of soft carbon coating and hard carbon coating which are combined with each other, the hardness of the soft carbon coating of the piston ring in the direction from inside to outside is gradually increased, and the hardness of the hard carbon coating of the piston ring in the direction from inside to outside is gradually increased. According to the piston ring, the chromium-titanium composite coating is adopted as the transition layers, the overall hardness gradient of the coating is effectively improved, then the combination effect between the carbon coating and the transition layers and the combination effect between the transition layers and the piston ring base body are improved, and the problem that the coating is peeled off in the high-temperature environment is solved. The composite structure that the hard carbon coatings and the soft carbon coatings are alternately arranged is adopted, so that part of stress released by the hard carbon coatings is absorbed through the soft carbon coatings, and the problem of coating disintegration caused by uneven stress release in the carbon coating can be solved.

Description

technical field [0001] The invention belongs to the technical field of piston rings, in particular to a diamond-like coating piston ring with double transition layers. Background technique [0002] Piston rings are metal rings used to embed in piston grooves. Piston rings are divided into two types: compression rings and oil rings. Compression rings can be used to seal the combustible mixture in the combustion chamber; Engine oil, the piston ring is a metal elastic ring with a large outward expansion deformation, which is assembled into the section and its corresponding annular groove, and the reciprocating and rotating piston ring relies on the pressure difference of gas or liquid to move outside the ring A seal is formed between the circular face and the cylinder and one side of the ring and the ring groove; [0003] In order to reduce the friction loss of the piston ring, the most commonly used method is to set a coating with a low friction coefficient on the friction su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26F02F5/00C23C14/02C23C14/16C23C14/06
CPCF16J9/26C23C14/025C23C14/16C23C14/022C23C14/0605
Inventor 程伟胜金皖娟金鹏程子阳
Owner ANQING TP GOETZE PISTON RING
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