Chromium based ceramic composite coating process and piston ring thereby

A technology of ceramic composite and processing method, applied in the field of piston rings, can solve the problems of large brittleness of the coating, low content of ceramic particles, falling off under force, etc., and achieves the effect of meeting high performance requirements and improving wear resistance.

Inactive Publication Date: 2003-06-18
ASIMCO SHUANGHUAN PISTON RING YIZHENG
View PDF0 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to a large amount of hydrogen evolution during chromium plating, the content of ceramic particles in the composite layer is extremely low, generall...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Take a piston ring with a diameter of 12 mm, and put it in 1000 liters of chromium plating solution, including 150 g / l of chromic anhydride, 1 g / l of sulfuric acid, 2 g / l of trivalent chromium, appropriate amount of catalyst AFC, current density of 100A / square decimeter, plating time For 5 minutes, a layer of 10 micron hard chromium was first plated; the chromium layer texture was processed by physical and chemical methods, with a density of 40 strips / mm, a width of 0.1 microns, and a depth of 2 microns; silicon nitride ceramic particles were embedded in the texture and fixed, and the particle size of the ceramic particles was 0.05-2 microns; in 1000 liters of chromium plating solution (150 g / L chromic anhydride, 1 g / L sulfuric acid, 2 g / L trivalent chromium, appropriate amount of catalyst AFC), current density 100A / square decimeter, plating time 5 Minutes, for sealing; then repeat twice from the beginning, the thickness of the chromium-based ceramic co...

Embodiment 2

[0009] Take a piston ring with a diameter of 100 mm, and put it in 1000 liters of chrome plating solution, including 250 g / l of chromic anhydride, 2.5 g / l of sulfuric acid, 3 g / l of trivalent chromium, an appropriate amount of catalyst AFC, and a current density of 70A / square decimeter , the electroplating time is 15 minutes, firstly plate ~ 25 microns of hard chromium; the physical and chemical method processes the chromium layer texture, the density is 120 strips / mm, the width is 2.5 microns, and the depth is 11 microns; the silicon carbide ceramic particles are embedded in the texture, and the ceramic particles The particle size is 1-5 microns; in 1000 liters of chromium plating solution (250 g / L of chromic anhydride, 2..5 g / L of sulfuric acid, 3 g / L of trivalent chromium, and an appropriate amount of catalyst AFC), the current density is 70A / square minute m, the electroplating time was 3 minutes, and the sealing was carried out; and repeated 25 times from ...

Embodiment 3

[0011] Take a piston ring with a diameter of 400 mm, and put it in 1000 liters of chromium plating solution, including 350 g / l of chromic anhydride, 4 g / l of sulfuric acid, 4 g / l of trivalent chromium, appropriate amount of catalyst AFC, current density of 40A / square decimeter, plating time For 40 minutes, first coat a layer of 50 micron hard chrome; process the texture of the chromium layer by physical and chemical methods, with a density of 200 strips / mm, a width of 5 microns, and a depth of 20 microns; the mixed ceramic particles of silicon nitride and silicon carbide are embedded in the texture and fixed , the particle size of ceramic particles is 1-10 microns; in 1000 liters of chromium plating solution (350 g / L of chromic anhydride, 4 g / L of sulfuric acid, 4 g / L of trivalent chromium, and an appropriate amount of catalyst AFC), the current density is 100A / square minute m, the electroplating time was 2 minutes, and the sealing was carried out; and repeate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Granularityaaaaaaaaaa
Thicknessaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

A plated composite Cr-base ceramic layer of piston ring is prepared through electroplating hard Cr layer on piston ring in the liquid containing CrO3, H2SO4, 3-valence Cr and catalyst AFC, chemically and physical generating cross hatches, inlaying ceramic microparticles, covering, sealing, and repeating several times. Its advantages are high power to bear heat load and mechanical load, and high antiwear performance.

Description

technical field [0001] The invention relates to a processing method and a piston ring of a novel chromium-based ceramic composite coating with ceramic particle content as high as 2-10% and ceramics distributed in the original cracks and pores of the chromium layer. 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, all components are chromium and a small amount of adsorbed H and O, the hardness is 750-1100HV0.1, and 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 heavy thermal and mechanical loads, the friction between the hard chrome-plated piston ring and the cylinder wall deteriorates, and fusion wear is prone to occur. High power, long life, low emission...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C25D15/00
Inventor 吴映雪刘千喜
Owner ASIMCO SHUANGHUAN PISTON RING YIZHENG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap