Piston ring and thermal sprayed coating for use therein, and method for manufacture thereof

A manufacturing method and spray coating technology, applied in the field of piston rings, can solve the problems of height difference, wear of piston rings, etc.

Inactive Publication Date: 2005-12-07
RIKEN CO LTD
View PDF4 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the film structure is not homogeneous, even if it is polished, the surface roughness of the sprayed film will not become below the desired level, and the counterpart piston ring will be worn.
Furthermore, since there is a very hard part locally composed only o

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Piston ring and thermal sprayed coating for use therein, and method for manufacture thereof
  • Piston ring and thermal sprayed coating for use therein, and method for manufacture thereof
  • Piston ring and thermal sprayed coating for use therein, and method for manufacture thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] (1) Manufacture of test piece

[0083] Manufacture a prism with a length of 5mm, a width of 5mm, and a length of 20mm made of the same spherical graphite cast iron (FCD600) as the base material of the piston ring, and grind one end surface (5mm×5mm) into a curved surface with a radius of curvature R of 10mm . On this curved surface, using #30 alumina particles, plasma treatment was performed to make the surface roughness (10-point average roughness Rz) 20 μm, and a test piece base material was produced. The spraying powder used was rapid solidification fine particles ("Sulzer Metco 5241", manufactured by Sulzer Metco). Sulzer Metco5241 is a spraying powder that melts a raw material having a composition of Cr:Ni:C=54:39:7 (mass%) and micronizes it by rapid solidification. Cr and C generate chromium carbide by melting and rapid solidification , Ni and Cr generate Ni-Cr alloy. That is, Sulzer Metco 5241 has a structure in which precipitated chromium carbide particles ar...

Embodiment 2

[0103] As the spraying powder, except using CRC-410 (mass ratio of chromium carbide particles: Ni-Cr alloy = 70: 30) manufactured by Praxair manufactured by the rapid solidification particle method, the same method as in Example 1 was used to produce a powder equivalent to Piston ring test piece. The surface roughness (10-point average roughness Rz) of the sprayed coating subjected to finishing processing was 2.64 μm.

[0104] The area ratio of the pores in the sprayed coating was 5% (therefore, the porosity was 5% by volume), and the average pore diameter of the pores was 3 μm. The area ratio of chromium carbide particles in the sprayed coating except for pores was 63%, and the average pore diameter of chromium carbide was 2.8 μm. As in Example 1, it has a characteristic shape in a dendritic or non-equiaxed coagulated tissue. As in Example 1, the average hardness of the measured spray coating was 815Hv0.1, and the standard deviation of hardness was 142Hv0.1.

[0105] As a ...

Embodiment 3

[0107] Add 15 parts by mass of polyvinyl alcohol as a binder, after spray drying and granulation, classification, sintering at 800°C, manufacturing Figure 8 Granulated sintered powder of chromium carbide particles / Ni-Cr alloy powder shown. The particle size of the granulated sintered powder is below 325 meshes.

[0108] After the plasma treatment was performed on the curved surface of the prism made of spherical graphite cast iron (FCD600) as in Example 1, activation treatment was performed just before thermal spraying in the same manner as in Example 1. Use the HVAF spraying gun (manufactured by Intelli-Jet Co., Ltd.) to carry out high-speed flame spraying on the curved surface of the prism with the above-mentioned granulated sintering powder under the conditions of flame velocity 2100m / sec and particle velocity 800m / sec, to form a thickness of 300μm. coating. As in Example 1, after finishing, the surface roughness (10-point average roughness Rz) of the thermal sprayed co...

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
Surface roughnessaaaaaaaaaa
Outer diameteraaaaaaaaaa
Lengthaaaaaaaaaa
Login to view more

Abstract

The piston ring of the present invention comprises a thermal spray coating comprising chromium carbide particles having an average particle size of 5 mum or less, and a matrix metal composed of a Ni-Cr alloy or a Ni-Cr alloy and Ni at least on an outer peripheral surface, said thermal spray coating having an average pore diameter of 10 mum or less and a porosity of 8% or less by volume. A piston ring having excellent wear resistance, scuffing resistance and peeling resistance with little attackability on a mating member is obtained by forming a homogeneous thermal spray coating having a fine microstructure.

Description

technical field [0001] The present invention relates to piston rings, sprayed coatings for piston rings, and manufacturing methods thereof, especially suitable for internal combustion engines, compressors, etc., which not only have excellent wear resistance, anti-sintering resistance, and peeling resistance, but also have excellent impact resistance to target materials Low piston ring, spray coating for piston ring and manufacturing method. Background technique [0002] Piston rings are required to have high performance such as high output of internal combustion engines, as well as excellent wear resistance and anti-seizing properties, so hard chrome plating is applied to the outer peripheral sliding surface of cast iron or steel piston rings Surface treatment such as plating, nickel composite plating, ion plating such as nitriding / chromium nitride, spray plating, etc. If it is a diesel engine with particularly harsh operating conditions, a cermet spray coating is used, but...

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): C23C4/04
Inventor 小原亮泷口胜美细坪幸男
Owner RIKEN CO LTD
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