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Piston ring and method for manufacturing same

A piston ring and chromium nitride technology, which is applied in the field of piston rings for automobile engines, can solve problems such as insufficient intermediate layers, and achieve the effects of reducing thermal stress, high heat transfer function, and excellent wear resistance

Inactive Publication Date: 2016-06-15
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the actual situation is that the above-mentioned intermediate layer is not sufficient enough to completely solve the problem of film peeling including the generation of cracks and chips of the amorphous hard carbon film.

Method used

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  • Piston ring and method for manufacturing same
  • Piston ring and method for manufacturing same
  • Piston ring and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A piston ring with a rectangular cross-section having a nominal diameter (d) of 96mm, a thickness (a1) of 3.8mm, and a width (h1) of 2.5mm and a barrel-shaped outer peripheral surface is produced from a wire rod of a material equivalent to SWOSC-V. 50 of these piston rings are overlapped, and the outer peripheral surface is adjusted to Rz by sandblasting JIS A surface roughness of 1.6 μm was measured and set into the AIP unit. As the evaporation source, metallic chromium with a purity of 99.9% was used for all relative evaporation source targets. First, in an atmosphere of 1.0 Pa of Ar gas with a purity of 99.99%, a bias voltage of -900V was applied to clean the outer peripheral surface of the piston ring as the base material by bombardment treatment, and then in order to improve the adhesion between the base material and the base layer, Only the metal Cr layer is formed into a film.

[0060] (formation of basal layer)

[0061] As the base layer of embodiment 1, the ...

Embodiment 2～6

[0086] In Examples 2 to 6, as in Example 1, an underlayer including a CrN / Cr laminate film was formed by ion plating under the film formation conditions shown in Table 1. Table 1 also shows the film formation conditions of Example 1 together. In addition, the film-forming conditions not described in Table 1 were set to be the same as Example 1. The formation time of the CrN layer and the Cr layer of setting embodiment 2 is shorter than embodiment 1, and embodiment 3 improves the N when the CrN layer is formed. 2 Divide the pressure and reduce the bias to make a relatively porous CrN layer. In addition, in Examples 4, 5 and 6, the formation time of the CrN layer and the Cr layer is prolonged to make a thicker laminated unit thickness. In Example 4, the formation time of the CrN layer was extended to be longer than the formation time of the Cr layer, and the ratio of the Cr layer was reduced.

[0087] [Table 1]

[0088]

[0089] For the base layer including the CrN / Cr lam...

Embodiment 7

[0100] In Example 7, a base layer including a CrCN / Cr laminate film was formed in the same manner as in Example 1 except that a CrCN layer was used instead of the CrN layer. Here, the process gas used for the formation of the CrCN layer is N 2 Gas 0.87Pa, CH 4 Gas 0.54Pa and Ar gas 0.09Pa. In Example 8, the formation time of the CrCN layer in Example 7 was made longer than that of the Cr layer, that is, the formation time was set to 0.9 minutes and 0.6 minutes, respectively, and the ratio of the Cr layer was reduced. Furthermore, the film-forming time was changed to reduce the thickness of the intermediate layer and the hard amorphous carbon film. The film-forming conditions of the base layer are shown in Table 5, the results of the film thickness measurement and X-ray diffraction measurement of the base layer are shown in Table 6, the film-forming conditions of the intermediate layer and the amorphous hard carbon film are shown in Table 7, Table 8 shows the results of meas...

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Abstract

In the present invention, in order to provide a piston ring covered with an amorphous hard carbon film that has low friction characteristics and outstanding abrasion resistance and film peeling resistance in order to achieve lower fuel consumption in an automobile, the outer peripheral surface of a steel piston ring base material is covered with a non-crystalline hard carbon film with a thickness of 0.4-20 [mu]m, with the following interposed therebetween: a base layer that comprises a CrN / Cr layered film or CrN / TiN layered film with a thickness of 10-60 [mu]m, in which CrN-type chromium nitride and chromium metal or TiN-type titanium nitride are layered alternately; and an intermediate layer that comprises chromium metal and / or titanium metal and has a thickness of 0.05-1.0 [mu]m.

Description

technical field [0001] The present invention relates to piston rings for automobile engines, and more particularly to piston rings coated with a film of amorphous hard carbon (hereinafter also referred to as "DLC (diamond-like carbon)") excellent in low friction, wear resistance, and film peeling resistance . Background technique [0002] In recent years, due to rising crude oil prices and deepening environmental problems, there has been a strong demand for low fuel consumption of automobiles. For piston rings, reduction of ring tension, application of an amorphous hard carbon film in which low friction is desired, and the like are being studied. Although these actually contribute to low fuel consumption, the reduction of the ring tension is close to the limit from the viewpoint of sealing performance, and there is a high-pressure stress generated during the film formation of the amorphous hard carbon film, which is different from the base material. The problem of poor adh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26C23C14/06C23C14/14F02F5/00
CPCC23C14/0641C23C14/0664C23C14/16C23C28/042C23C28/044C23C28/322C23C28/34C23C28/42F16J9/26C23C28/343
Inventor 佐藤雅之村山祐一岩本阳平关矢琢磨
Owner RIKEN CO LTD
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