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PVD chromium based ceramic composite coating piston ring and method for producing the same

A ceramic composite, piston ring technology, applied in the direction of piston ring, coating, metal material coating process, etc., can solve the problems of incapable of large-scale industrial production, reduction of coating growth rate, increase of coating cost, etc. Good prospects for industrial application, good wear resistance and low cost

Inactive Publication Date: 2009-05-13
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General-purpose electrochrome plating generally requires a thickness of 50-150 microns. If the traditional method is used, it means plating for 10-30 hours, and the coating cost will rise sharply.
The above method reduces the growth rate of the coating after reaching a certain thickness during thick film preparation, and at the same time, the coating will fall off due to the increase of stress, so large-scale industrial production cannot be carried out.

Method used

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  • PVD chromium based ceramic composite coating piston ring and method for producing the same
  • PVD chromium based ceramic composite coating piston ring and method for producing the same
  • PVD chromium based ceramic composite coating piston ring and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Glow cleaning is performed on the nitriding piston ring at 400°C in an argon environment. During the glow discharge process, the bias voltage on the workpiece is -1000V, and the glow time is 30 minutes; glow cleaning After the end, a transition metal Cr layer with a thickness of 150 nanometers was deposited by arc discharge method under 0.3Pa pressure condition; then 20 micron Cr / CrN main wear-resistant layer was deposited by arc discharge method under 450°C, -150V bias, and 2.3Pa pressure condition. layer, wherein each layer of Cr is 0.2 microns, each layer of CrN is 4.8 microns, the thickness of Cr and CrN two layers is 5 microns, and the main wear-resistant layer includes 4 layers of Cr and 4 layers of CrN; Depositing 10 micron Cr / Cr by arc discharge method at 450°C, -200V bias, and 3.3Pa pressure 2 o 3 Anti-friction layer, wherein each layer of Cr is 0.1 micron, and each layer of Cr 2 o 3 1.9 µm, Cr and Cr 2 o 3 The thickness of the two layers is 2 m...

Embodiment 2

[0019] Example 2: Glow cleaning is performed on the nitriding piston ring at 430°C in an argon environment. During the glow discharge process, the bias voltage on the workpiece is -1200V, and the glow time is 60 minutes; glow cleaning After the end, a transition metal Cr layer with a thickness of 100 nanometers was deposited by arc discharge method at 0.5Pa pressure condition; then 18 micron Cr / CrN main wear-resistant layer was deposited by arc discharge method at 430°C, -200V bias voltage and 3Pa pressure condition , where each layer of Cr is 0.2 microns, each layer of CrN is 4.3 microns, the thickness of the two layers is 4.5 microns, the main wear-resistant layer includes 4 layers of Cr and 4 layers of CrN; when the main wear-resistant layer is deposited, at 450 ° C, - Deposition of 6 micron Cr / Cr by arc discharge under 200V bias and 4.3Pa air pressure 2 o 3 Anti-friction layer, wherein each layer of Cr is 0.2 microns, and each layer of Cr 2 o 3 1.8 µm, Cr and Cr 2 o 3...

Embodiment 3

[0020] Example 3: Glow cleaning the nitriding piston ring at 450°C in an argon environment, the bias voltage on the workpiece during the glow discharge process is -1200V, and the glow time is 30 minutes; glow cleaning After the end, a transition metal Cr layer with a thickness of 150 nanometers was deposited by arc discharge method at 1.0Pa pressure; then a 15 micron Cr / CrN main wear-resistant layer was deposited by arc discharge at 450°C, -230V bias, and 5Pa pressure conditions , wherein each layer of Cr is 0.1 micron, each layer of CrN is 4.9 micron, the thickness of two layers of Cr and CrN is 5 microns, and the main wear-resistant layer includes 3 layers of Cr and 3 layers of CrN; when the main wear-resistant layer is deposited, at 440 Deposit 10 micron Cr / Cr by arc discharge method under the condition of -150V bias voltage and 3.3Pa air pressure 2 o 3 Anti-friction layer, wherein each layer of Cr is 0.1 micron, and each layer of Cr 2 o 3 2.4 microns, Cr and Cr 2 o 3 ...

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Abstract

The invention discloses a PVD chromium base ceramic composite coating piston ring and a preparation method thereof, and the piston ring is manufactured by plating a chromium base ceramic composite coating on a basal body of the piston ring which is treated by nitriding by adopting high power electric arc discharge method; the chromium base ceramic composite coating is composed of a bonding layer, a main wearing layer and an anti-attrition layer, wherein, the bonding layer is binded with the basal body of the piston ring in a metallurgical way, the main wearing layer is arranged on the bonding layer, and the anti-attrition layer is positioned on the surface of the main wearing layer; the bonding layer is Cr, the main wearing layer is a Cr / CrN multilayer coating formed by the Cr and the CrN which are alternately arranged, and the anti-attrition layer is a Cr / Cr2O3 multilayer coating formed by the Cr and the Cr2O3 that are alternately arranged. The coating structure has reasonable design, and the manufactured coating has good cementing property, high hardness and good lubricating property. Furthermore, the method used for manufacturing the piston ring has no pollution in the preparation process, and overcomes the serious problem of environmental pollution of the conventional electrodeposited chromium; as the manufactured coating has better abrasion resistant and corrosion resistant performance compared with the electrodeposited chromium, the service life of the piston ring is greatly prolonged.

Description

technical field [0001] The invention relates to a PVD chromium-based ceramic composite coating piston ring and a preparation method thereof, belonging to the field of thin film materials. Background technique [0002] Piston rings and pistons are one of the most critical components in an engine. At present, nitriding and chrome plating are the most widely used technologies on the surface of piston rings. Since the wear resistance of nitriding piston rings is worse than that of electrochrome plating, chrome plating on the surface of piston rings has become the main measure to improve their service life. It changes the nature of the friction surface by covering the outer circle or the upper and lower end faces or even the inner circle surface with a chrome layer to improve the wear resistance of the piston ring. Practice has proved that after the first ring is chrome-plated, its service life is 3 to 5 times longer than that of cast iron rings. At the same time, the service li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26F02F5/00C23C14/54C23C14/06
Inventor 杨兵丁辉付德君
Owner WUHAN UNIV
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