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Wear-resistant piston ring with hard-soft composite coating and textured surface and preparation method

A composite coating and textured technology, applied in the field of piston rings, can solve the problems of cylinder liner aggressiveness, high friction coefficient, piston ring wear, etc.

Inactive Publication Date: 2015-09-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hardness of the hard coating is high, resulting in an increase in the brittleness of the coating, poor matching and bonding with the substrate, and easy peeling off during the friction process
In addition, this type of coating has a high friction coefficient and is highly aggressive to the cylinder liner. It is prone to severe wear of the piston ring when the lubricating oil film fails or the oil supply is insufficient.

Method used

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  • Wear-resistant piston ring with hard-soft composite coating and textured surface and preparation method
  • Wear-resistant piston ring with hard-soft composite coating and textured surface and preparation method
  • Wear-resistant piston ring with hard-soft composite coating and textured surface and preparation method

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Experimental program
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Effect test

Embodiment 1

[0029] 1) Degrease and ultrasonically clean the outer surface of the piston ring before plating; 2) Use a bidirectional pulse plating power supply for electrodeposition, and the plating solution contains chromic anhydride (CrO 3 ) 100 g / L, sulfuric acid 1 g / L, the weight ratio of the two is 100:1, Cr 3+ The content is controlled at 3 g / L, the bath temperature is 30 °C, and the cathode current density is 10 A / dm 2About, electroplating time 360 ​​min; 3) Nd: YAG pulsed laser is used to texture the outer surface of piston ring, the microhole spacing is 400 μm, the laser pulse is repeated once at the same point, the microhole diameter is 50 μm and the depth is 6 μm , the micropore area occupancy rate is 1%; 4) Electroless silver plating is carried out on the surface of the textured chrome-plated piston ring. The plating solution contains 30 g / L silver nitrate, 200 g / L sodium thiosulfate, and 80 g / L sodium bisulfite. L, sodium acetate 20 g / L, thiosemicarbazide 0.5 g / L, pH controll...

Embodiment 2

[0031] 1) Degrease and ultrasonically clean the outer surface of the piston ring before plating; 2) Use a bidirectional pulse plating power supply for electrodeposition, and the plating solution contains chromic anhydride (CrO 3 ) 125 g / L, sulfuric acid 1 g / L, the weight ratio of the two is 125:1, Cr 3+ The content is controlled at 5 g / L, the bath temperature is 50 °C, and the cathode current density is 40 A / dm 2 About, electroplating time 360 ​​min; 3) Nd: YAG pulsed laser was used to texture the outer surface of the piston ring, the microhole spacing was 800 μm, the number of laser pulses was repeated 4 times at the same point, the micropore diameter was 150 μm and the depth was 40 μm , the micropore area occupancy rate is 2.8%; 4) Electroless silver plating is carried out on the surface of the textured chrome-plated piston ring. The plating solution contains 40 g / L silver nitrate, 200 g / L sodium thiosulfate, and 80 g / L sodium bisulfite. L, sodium acetate 20 g / L, thiosemica...

Embodiment 3

[0033] 1) Degrease and ultrasonically clean the outer surface of the piston ring before plating; 2) Use a bidirectional pulse plating power supply for electrodeposition, and the plating solution contains chromic anhydride (CrO 3 ) 150 g / L, sulfuric acid 1 g / L, the weight ratio of the two is 150:1, Cr 3+ The content is controlled at 7 g / L, the bath temperature is 60 °C, and the cathode current density is 60 A / dm 2 About, electroplating time 360 ​​min; 3) Nd: YAG pulsed laser is used to texture the outer surface of the piston ring, the microhole spacing is 400 μm, the number of laser pulses is repeated 8 times at the same point, the microhole diameter is 200 μm and the depth is 55 μm , the micropore area occupancy rate is 20%; 4) Electroless silver plating is carried out on the surface of the textured chrome-plated piston ring, the plating solution contains silver nitrate 50 g / L, sodium thiosulfate 200 g / L, sodium bisulfite 80 g / L L, sodium acetate 20 g / L, thiosemicarbazide 1 g...

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Abstract

The invention discloses a wear-resisting piston ring with a hard-soft composite coating and the textured surface and a wear-resisting piston ring manufacture method. A hard coating like a chromium coating or a carburization / nitriding layer or a nickel base layer is deposited on an outer circle face of the piston ring, the hard coating is textured by pulse laser to achieve a regular and even micropore array, and a soft coating like a silver coating or a tin coating or a magnetic control sputtering MoS2 coating is prepared on the textured surface. The hard coating can serve as a hard support layer to improve wear resistance of the outer circle face of the piston ring. The surface micropore array can enhance fluid hydrodynamic effects of lubrication oil, can serve as a storage tank for lubrication oil / agent and can collect abrasive dust particles. The soft coating can serve as lubrication phase to achieve self lubrication and self repair of the friction surface.

Description

technical field [0001] The invention relates to a piston ring, in particular to a friction-reducing and wear-resistant piston ring with a hard-soft composite coating and a textured surface and a preparation method thereof. Background technique [0002] Piston ring is one of the key parts of the internal combustion engine, which plays the roles of sealing, lubrication, heat conduction and positioning in the internal combustion engine. The working conditions of piston ring and cylinder liner are very severe, often in the state of high temperature, high pressure and high impact load. The combustion of fuel in the cylinder makes the temperature up to 2500 K, and the piston ring generates thermal stress due to thermal expansion; Large impact; when the piston reciprocates up and down, the cylinder liner generates radial pressure on the piston ring, and the reverse pressure generated by the compressed gas plus thermal stress makes the contact surface pressure as high as 5-10 MPa. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F5/00C23F17/00C25D3/04C23C8/36
Inventor 熊党生秦永坤李建亮
Owner NANJING UNIV OF SCI & TECH
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