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Chromium based diamond composite chrome plating coating piston ring and method of processing the same

A piston ring and diamond technology, applied in the field of piston rings, can solve the problems of high brittleness of the coating, low content of diamond particles, falling off under force, etc., and achieve the effect of improving wear resistance and tensile cylinder performance

Active Publication Date: 2012-08-29
ASIMCO SHUANGHUAN PISTON RING YIZHENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to a large amount of extreme hydrogen during chromium plating, the content of diamond particles in the composite layer is extremely low, generally not more than 1%; and because diamond particles are mixed between chromium grains, the coating is prone to greater brittleness, which is easy to cause force to fall off

Method used

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  • Chromium based diamond composite chrome plating coating piston ring and method of processing the same
  • Chromium based diamond composite chrome plating coating piston ring and method of processing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take a piston ring with a diameter of φ60 mm, and put it in 1000 liters of chromium plating solution, including 250 grams / liter of chromic anhydride, 2.5 grams / liter of sulfuric acid, 3 grams / liter of trivalent chromium, appropriate amount of catalyst A, current density of 70A / square decimeter, plating time For 15 minutes, first coat a layer of 25 micron hard chromium; process the chromium layer texture by physical and chemical method, with a density of 120 strips / mm, a width of 2.5 microns, and a depth of 11 microns; diamond particles are embedded in the mesh and fixed, and the particle size of the diamond particles is 0.05-8.0 Micron; in 1000 liters of chrome plating solution (250 g / L of chromic anhydride, 2.5 g / L of sulfuric acid, 3 g / L of trivalent chromium, 1 g / L of potassium fluorosilicate, 1 g / L of potassium methanesulfonate, current The density is 70A / square decimeter, the electroplating time is 3 minutes, and the sealing is carried out; then repeat 25 times from...

Embodiment 2

[0025] Take a piston ring with a diameter of φ300 mm, and put it in 1000 liters of chromium plating solution, including 350 grams / liter of chromic anhydride, 4 grams / liter of sulfuric acid, 4 grams / liter of trivalent chromium, 2 grams / liter of potassium fluorosilicate, and 3 grams / liter of potassium methanesulfonate. g / L, current density 40A / square decimeter, electroplating time 40 minutes, first plate a layer of 50 micron hard chromium; process the chromium layer texture by physical and chemical method, density 150 strips / mm, width 5 microns, concentration 20 microns; The particles are embedded in the mesh and fixed, and the particle size of the diamond particles is 0.05-2.0 microns; in 1000 liters of chrome plating solution (350 g / L of chromic anhydride, 4 g / L of sulfuric acid, 4 g / L of trivalent chromium, and 2 g / L of potassium fluorosilicate gram / liter, potassium methanesulfonate 3 grams / liter) current density 100A / square decimeter, electroplating time 2 minutes, seal; Repe...

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Abstract

The invention relates to a piston ring with a chromium-base carbite compounding chroming coating and a processing method of the piston ring. The piston ring adopts the structure that the excircle surface of the piston ring is coated with a carbite compounding chroming coating, the thickness of the carbite compounding chroming coating reaches 0.03-0.30 millimeters. The processing method of the piston ring comprises the following steps: preparing a plating solution by the ingredients such as chromic anhydride, sulphuric acid, trivalent chromium, potassium fluosilicate, potassium methionate, carbite particulates and the balance deionized water; stirring the plating solution; and carrying out the compounding chroming of the carbite. The invention has the advantages that the chromium-base carbite compounding chroming coating comprises a plurality of unit compounding chroming coatings and is in a typical layer structure, the chroming coating body of each unit compounding chroming coating has certain density, depth, width and intercrossed reticulate patterns, and the carbite particulates are embedded into the reticulate patterns. Because section holes are formed by the intercrossing of the reticulate patterns, and the carbite particulates are distributed in the holes, the piston ring has high carbite content without abnormal brittleness, can bear heavy heat load and mechanical load without causing cylinder scuffing and has high abrasion resistance and cylinder scuffing resistance.

Description

technical field [0001] The invention relates to a processing method of a chromium-based diamond composite coating with a diamond particle content of 0.5-5.0% and diamonds distributed in the original cracks and pores of the chromium layer and a piston ring thereof. It belongs to the technical field of piston rings. Background technique [0002] At present, hard chrome plating is widely used for surface strengthening of internal combustion engine piston rings. The thickness of the hard chromium coating is generally 0.05-0.20mm. The whole composition is chromium and a small amount of adsorbed H and O. The hardness is 750-1100HV0.1. There are pores formed by the interlacing of cracks in the layer, which has good wear resistance. However, in the case of poor lubrication conditions or high thermal load, the friction between the hard chrome-plated piston ring and the cylinder wall deteriorates, and fusion wear is prone to occur. In severe cases, "cylinder scuffing" or chrome layer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F5/00F16J9/26C25D15/00C25D3/04
Inventor 吴映雪刘千喜陈耀文
Owner ASIMCO SHUANGHUAN PISTON RING YIZHENG
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