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Piston ring

A technology of piston rings and solid lubricants, applied in the direction of piston rings, machines/engines, solid diffusion coatings, etc.

Inactive Publication Date: 2005-09-14
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, although polyamide-imide-silica hybrid materials and polyimide-silica hybrid materials have excellent heat resistance and mechanical strength, they do not necessarily satisfy the aluminum sticking prevention effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Pretreatment

[0049] The surface of the top ring base material made of martinite stainless steel was subjected to nitriding treatment using a gas nitriding method, and then degreased with a commercially available alkaline degreasing solution. It is then washed with water and then fully dried.

[0050] (2) Preparation of coating liquid

[0051] As a heat-resistant material, a silane-modified polyamideimide resin was dissolved in a solvent in which N-methyl-2-pyrrolidone and xylene were mixed in a mass ratio of 80:20 to form a varnish (manufactured by Arakawa Chemical Industry Co., Ltd. , Konpocelan H901), so that the total concentration of polyamideimide and silica is 30% by mass, molybdenum disulfide with an average particle size of 5 μm and an average particle size of 5 μm are added to the varnish as a solid lubricant. Graphite of 4 μm was used to adjust the solid content to 30 mass % and 10 mass %, respectively, and stirred sufficiently to prepare a coating liq...

Embodiment 2

[0055] A varnish prepared by dissolving a silane-modified polyimide resin in a solvent obtained by mixing N-methyl-2-pyrrolidone and xylene at a mass ratio of 80:20 (Konpocellan H800, manufactured by Arakawa Chemical Industry Co., Ltd.) was used. , wherein the total concentration of polyimide and silica is 18% by mass. Except that the curing temperature was 300°C, in the same manner as in Example 1, a coating liquid was applied to one side of the top ring base material, and then a curing treatment was performed to form a polyimide-dilubricated solid lubricant dispersed Resin coating made of silicon oxide mixed material. The composition and thickness of the cured film are shown in Table 1.

Embodiment 3

[0057] In order to make the mass ratio of the polyamideimide-silica mixed material and the polyimide-silica mixed material after curing treatment to be 1:1, N-methyl-2 was mixed in a mass ratio of 80:20. - The silane-modified polyamideimide resin used in Example 1 and the silane-modified polyimide resin used in Example 2 were dissolved in a solvent consisting of pyrrolidone and xylene to form a varnish. Using the varnish described above, except that the curing temperature was 300°C, the coating liquid was applied to one side of the top ring base material in the same manner as in Example 1, and the curing treatment was carried out to form a solid lubricant dispersed solid lubricant. Resin film composed of polyamideimide-silica hybrid material. The composition and thickness of the cured film are shown in Table 1.

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Abstract

The film made of the heat resistant material at least on one side surface of which the solid lubricant is dispersed is provided on the piston ring for an internal combustion engine, and the heat resistant material is formed of at least one kind of a polyamide-imide silicon dioxide hybrid material and a polyimide silicon dioxide hybrid material.

Description

technical field [0001] The present invention relates to a piston ring for an internal combustion engine covered with a resin film with a low friction coefficient. Background technique [0002] In an internal combustion engine, the reciprocating motion of the piston is repeated due to the explosion of the fuel in the combustion chamber, and along with this, the piston ring groove of the piston and the piston ring are repeatedly collided. By the explosion, the temperature in the vicinity of the top ring of a gasoline engine rises to around 250° C., and in a diesel engine, it rises further to a high temperature. When the piston ring is impacted at such a high temperature, fatigue fracture occurs on the surface of the piston ring groove of the piston made of aluminum alloy, and surface peeling occurs, and small aluminum pieces fall off. Further, the aluminum alloy sheet that has fallen off, or the aluminum alloy exposed on the surface caused by the falling off, is glued to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/80C23C30/00F16J9/26
CPCC23C8/80C23C30/00F16J9/26
Inventor 村松晓井上茂夫
Owner RIKEN CO LTD