Method for coating silicon nitride film layer on piston ring surface

A technology of silicon nitride film and surface coating, which is applied in the direction of piston ring, coating, metal material coating process, etc., to achieve the effect of prolonging life, improving performance, widely promoting value and application prospect.

Inactive Publication Date: 2010-02-10
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Previously, there were few reports at home and abroad on the coating of silicon nitride film on the surface of piston rings.

Method used

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  • Method for coating silicon nitride film layer on piston ring surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The ordinary piston ring is polished with a DJP-II electrolytic polishing machine, the purpose is to improve the surface finish of the piston ring to be deposited and remove the oxide skin on the surface. Put the polished piston ring in an ultrasonic cleaner for 15 minutes, take it out and clean the surface with acetone. Then put the piston ring into the deposition chamber of the HQ-2 RF-PECVD equipment, and the system is evacuated to 5×10 -3 Pa. Set the temperature to 300°C, turn on the heater, and start deposition when the temperature of the deposition chamber stabilizes at the set value. The selected radio frequency power is 150W, and the flow rates of silane and ammonia are respectively 45 sccm and 90 sccm by adjusting a mass flow meter (MFC). After the deposition time reaches 20 minutes, the reaction gas source, radio frequency source and heater are turned off, and the deposition is stopped. After the piston ring is cooled, it is taken out, and a uniform and dens...

Embodiment 2

[0021] The ordinary piston ring is polished with a DJP-II electrolytic polishing machine, the purpose is to improve the surface finish of the piston ring to be deposited and remove the oxide skin on the surface. Put the polished piston ring in an ultrasonic cleaner for 15 minutes, take it out and clean the surface with acetone. Then put the piston ring into the deposition chamber of the HQ-2 RF-PECVD equipment, and the system is evacuated to 5×10 -3 Pa. Set the temperature to 400°C, turn on the heater, and start deposition when the temperature of the deposition chamber stabilizes at the set value. The selected radio frequency power is 90W, and the flow rates of silane and ammonia are respectively 15 sccm and 60 sccm by adjusting a mass flow meter (MFC). After the deposition time reaches 30 minutes, the reaction gas source, radio frequency source and heater are turned off, and the deposition is stopped. After the piston ring is cooled, it is taken out, and a uniform and dense...

Embodiment 3

[0023] The ordinary piston ring is polished with a DJP-II electrolytic polishing machine, the purpose is to improve the surface finish of the piston ring to be deposited and remove the oxide skin on the surface. Put the polished piston ring in an ultrasonic cleaner for 15 minutes, take it out and clean the surface with acetone. Then put the piston ring into the deposition chamber of the HQ-2 RF-PECVD equipment, and the system is evacuated to 5×10 -3 Pa. Set the temperature to 500°C, turn on the heater, and start deposition when the temperature of the deposition chamber stabilizes at the set value. The selected radio frequency power is 120W, and the flow rates of silane and ammonia are respectively 30 sccm and 90 sccm by adjusting a mass flow meter (MFC). After the deposition time reaches 10 minutes, the reaction gas source, radio frequency source and heater are turned off, and the deposition is stopped. After the piston ring is cooled, it is taken out, and a uniform and dens...

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Abstract

The invention discloses a method for applying a silicon nitride film layer on the surface of a piston ring. The method comprises the following steps of: electro-polishing and ultrasonic-cleaning the piston ring; disposing the cleaned piston ring in RF plasma-enhanced chemical vapor deposition equipment, vacuumizing the system to 5*10<-3> Pa, reacting in the presence of silicane and ammonia gas asreaction gas resource at a deposition temperature of 300 to 500 DEG C and RF power of 90 to 150 W for 10 to 30 min to deposit the silicon nitride film on the upper surface and the side surface of thepiston ring, wherein the a flow rate of the silicane is 15 to 45 sccm and the flow rate ratio of the silicane to the ammonia gas is 1 / 2 to 1 / 4; and naturally cooling and taking out. The surface hardness of the piston ring deposited with the silicon nitride film layer is 900 to 1,400 HV, which is far higher than the hardness 800 HV of common chromium-plated products. The film layer has good corrosion resistance, abrasion resistance and self-lubrication characteristic, thus effectively improving the use performance of the piston ring, and improving the operation stability and prolonging the service life. The method overcomes the disadvantages of conventional chromium-plated piston ring such as larger energy consumption, serious pollution and complex process.

Description

technical field [0001] The invention relates to surface modification of piston rings, in particular to a method for coating silicon nitride film on the surface of piston rings. Background technique [0002] Piston ring is an important part of the internal combustion engine, and its quality directly affects the technical indicators such as power output, fuel consumption, and combustion emissions of the internal combustion engine. The working surface of the piston ring is often in a semi-dry friction state, and the working conditions are harsh and prone to wear. At the same time, reciprocating motion and high-temperature combustion will cause great mechanical stress and thermal stress on the piston ring. Therefore, improving the friction performance of the piston ring is of great significance to prolong the service life of the piston ring. [0003] In order to improve the performance of the piston ring, in addition to changing the material, more methods of surface strengthen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/517C23C16/02F02F5/00F16J9/26
Inventor 杜平凡席珍强王龙成徐敏汪新颜姚剑
Owner ZHEJIANG SCI-TECH UNIV
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