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Method for processing multilayer Cr based network embedded superhard wear-proof particle plating layer piston ring

A processing method and technology of superhard particles, which can be used in piston rings, engine components, machines/engines, etc., and can solve problems such as easy falling off of coatings

Inactive Publication Date: 2006-08-30
NANJING FAYN PISTON RING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to a large amount of hydrogen evolution during chrome plating, the content of ceramic particles in the composite layer generally does not exceed 1%, and the coating is easy to fall off after being stressed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The following takes the production of piston rings for Yunnei 4102QBZL diesel engine as an example to illustrate the main production process:

[0026] 1. Prepare 3m of plating solution according to the above ratio 3 :

[0027] CrO3 150 g / L, analytically pure sulfuric acid 1.5 g / L, potassium fluorosilicate 9 g / L, the rest is deionized water, the bath temperature is controlled at: 60±2°C

[0028] 2. Put the piston ring into the plating solution, and turn on the forward current at 75A / Dm 2 Plating at a current density of 10 minutes, the outer surface of the piston ring is covered with a layer of hard chromium, and the thickness of the coating is about 0.01-0.02mm.

[0029] 3. With 50A / Dm 2 The current density on the surface of the piston ring is reverse-engraved for 100 seconds, and the grid crack is about 0.008mm deep and 0.005-0.02mm wide

[0030] 4. Add superhard particles SiC, Al2O3, and diamond with a size of 0.0005-0.005 mm into the plating solution and stir them...

Embodiment 2

[0034] This embodiment is to produce piston rings for Xichai 6DL diesel engine, and its process steps and conditions are the same as in Example 1, except that the liquid proportioning ratio is different:

[0035] CrO3380 g / L, sulfuric acid analytically pure 3.5 g / L, potassium fluorosilicate 19 g / L, the rest is deionized water, and the bath temperature is controlled at: 60±2°C.

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PUM

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Abstract

The invention includes the following steps of preparing the bath (g / l): CrO3 100-400, analytically pure sulfate 1-4, potassium fluosilicate 8-20 and the rest is ionic water; putting the piston ring in the bath and striking forward current to make a hard chromium coating cover on the cylindrical surface; striking backward current make the hard chromium coating on the surface of the piston ring be backcut; adding the supperhard particle into the bath to mix to make it be filled in the network crack on the chromium coating surface of the piston ring; electroplating forward to close the network crack, in order to fix the supperhard particle; repeating the steps 2-5 until the coating thickness can reach the request.

Description

technical field [0001] The invention relates to a processing method for a piston ring, in particular to a processing method for a piston ring with a multi-layer chromium-based grid embedded with a superhard wear-resistant particle coating Background technique [0002] Piston ring is an important part of the engine, which is directly related to the working performance and service life of the engine, and the surface treatment of the outer circle of the piston ring is a crucial process in the process of piston ring processing. In order to improve the wear resistance and friction reduction of piston rings, the surface treatment of piston rings is generally carried out by spraying molybdenum, hard chrome plating, flame spraying and other methods to strengthen the surface. At present, on the basis of hard chrome plating, the ceramic infiltration process on the surface of the chrome layer has been developed. This process adopts the conventional composite plating process, and the ce...

Claims

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Application Information

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IPC IPC(8): F02F5/00C25D3/04C25D5/00
Inventor 张昭华张仪王蓬生李正伟
Owner NANJING FAYN PISTON RING
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