A kind of production method of nanocomposite surface piston ring

A production method and nano-composite technology, applied in the field of piston rings, can solve the problems of high spraying noise, increased brittleness, roughness, etc., and achieve the effects of prolonging service life, improving toughness and wear resistance, and improving bite

Inactive Publication Date: 2016-04-13
江苏仪征金派内燃机配件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermal spraying is the first dry chromium replacement technology approved by the US Department of Defense so far. The advantage of this method is that it can deposit various materials and get thick coatings. The deposition speed is faster than chrome plating, but the cost is high and the spraying noise Large and can only be deposited on small areas, not suitable for large and complex parts, the plating layer is stressed and rough
Ion implantation modification can be harder and more wear-resistant than the chromium layer; physical vapor deposition and chemical vapor deposition have the characteristics of hard film, wear-resistant, porous, etc. These technologies are also complicated in process and high in cost
The piston rings developed by the composite coating technology developed in recent years, the solid particles in the wear-resistant composite coating are generally ceramic particles, and their particle sizes are all in the micron order. The wear resistance is excellent, but the wear reduction and corrosion resistance are not ideal. In particular, it is difficult to balance the hardness and toughness of the coating; increasing the hardness is often at the expense of toughness, resulting in increased brittleness, resulting in poor matching and bonding between the coating and the substrate, the coating is easy to crack, and the hard phase is easy to fall off

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for producing a nano-composite surface piston ring. The cast iron matrix piston ring blank is de-oiled before plating, and the surface is cleaned; The surface of the part is uniform tile gray; put the piston ring blank into the electroplating solution 1 for reverse etching. The electroplating solution 1 uses water as a solvent, in which 1.3 g / L of sulfuric acid is dissolved, the control voltage is 3 volts, and the time is 35 Second, the temperature is 55 ° C; the piston ring blank after reverse etching is put into electroplating solution II for electrodeposition. Electroplating solution II uses water as a solvent, and dissolves 180 g / L of nickel sulfate and 30 g of nickel chloride. / L, boric acid 15 g / L, phosphorous acid 10 g / L, nano-carbon 0.05 / L, inorganic dispersant 0.01 g / L, PH value 1.2-1.8; iron ion in electroplating solution II is less than 10 g / L, during electrodeposition The temperature is 60-70℃, the pulse width is 2ms, and the average current density...

Embodiment 2

[0020] A method for producing a nano-composite surface piston ring. The cast iron matrix piston ring blank is de-oiled before plating, and the surface is cleaned; The surface of the parts is uniform tile gray; put the piston ring blank into the electroplating solution 1 for reverse etching. The electroplating solution 1 uses water as a solvent, in which 1.7 g / L of sulfuric acid is dissolved, and the control voltage is 5 volts, and the time is 65 Second, the temperature is 65 ° C; the piston ring blank after reverse etching is put into electroplating solution II for electrodeposition. Electroplating solution II uses water as a solvent, and dissolves 260 g / L of nickel sulfate and 60 g of nickel chloride. / L, boric acid 40g / L, phosphorous acid 40g / L, nano carbon 2.0g / L, inorganic dispersant 0.8g / L, PH value 1.2-1.8; iron ion in electroplating solution II is less than 10g / L, electrodeposition The temperature is 60-70℃, the pulse width is 2 milliseconds, and the average current den...

Embodiment 3

[0022] A method for producing a nano-composite surface piston ring. The cast iron matrix piston ring blank is de-oiled before plating, and the surface is cleaned; The surface of the part is uniform tile gray; put the piston ring blank into the electroplating solution 1 for reverse etching. Second, the temperature is 60 ° C; the piston ring blank after reverse etching is put into electroplating solution II for electrodeposition. Electroplating solution II uses water as a solvent, and dissolves 220 g / L of nickel sulfate and 50 g of nickel chloride. / L, boric acid 25g / L, phosphorous acid 30g / L, nano carbon 1g / L, inorganic dispersant 0.5g / L, PH value 1.2-1.8; iron ion in electroplating solution II is less than 10g / L, electrodeposition The temperature is 60-70℃, the pulse width is 2 milliseconds, and the average current density is 1.5-5.0A / cm 2 , the duty ratio is 1:2-1:8, and the thickness of the nano-coating formed by electrodeposition to the outer surface of the piston ring bla...

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PUM

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Abstract

The invention discloses a production method of a nanocomposite surface piston ring. The method comprises the following steps: performing degreasing to a piston ring blank made of cast iron substrate before planting, cleaning the surface of the blank, performing sand blasting to the blank, adding the piston blank into electroplate liquid I to be subjected to reverse etching, adding the blank subjected to reverse etching into electroplate liquid II to be subjected to electrolytic deposition till the thickness of nano-coating formed on the outside circle surface of the blank is 0.06 to 0.12mm, and adding a semi-finished piston ring into a grinding cylinder to grind the semi-finished piston ring till the thickness of the nano-coating is 0.04 to 0.10mm to form a finished piston ring. According to the method, a nano wild phase with high wearing resistance, corrosion resistance, good tenacity and self-lubrication to replace micron-sized traditional solid particles to modify the surface of the piston ring, an electric pulse technology is adopted to realize the nanocrystallization of Ni-P crystal grain on the surface of the piston ring, and nano-coating with the nano-phase embedded uniformly further improves the tenacity and the wearing resistance of the surface of the piston ring.

Description

technical field [0001] The invention relates to the field of piston rings, in particular to a production method of a nano-composite surface piston ring. Background technique [0002] At present, the competitive high-end piston ring products in the market are products using thermal spraying, ion implantation, physical vapor deposition, chemical vapor deposition and other technologies. Thermal spraying is the first dry chrome replacement technology approved by the US Department of Defense so far. The advantages of this method are that various materials can be deposited, thick coatings can be obtained, the deposition speed is faster than chrome plating, but the cost is high and the spraying noise Large and can only be deposited on a small area, not suitable for large and complex parts, the coating is stressed and rough. Ion implantation modification can be harder and more wear-resistant than the chromium layer; physical vapor deposition and chemical vapor deposition have the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D7/04C25D15/00C25D5/36C25D5/18C25D5/52
Inventor 魏青松
Owner 江苏仪征金派内燃机配件有限公司
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