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Sliding member and production process thereof

A technology of sliding parts and sliding surfaces, applied in the direction of engine components, lubricating compositions, machines/engines, etc., can solve problems such as low friction coefficient

Active Publication Date: 2007-06-06
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But this DLC coating cannot always exhibit a low coefficient of friction in the presence of lubricating oil

Method used

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  • Sliding member and production process thereof
  • Sliding member and production process thereof
  • Sliding member and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0025] According to a first embodiment of the present invention, the outermost surface portion of the hard carbon coating has a lower hydrogen content than the remaining portion thereof. Utilizing such a hydrogen content distribution makes it possible to improve the adhesion of the hard carbon coating to the substrate, and to increase the thickness of the hard carbon coating to a sufficient extent to ensure or improve the low Tribological properties, wear resistance and durability. Here, the "outermost surface portion" of the hard carbon coating is defined as a portion below the sliding surface, for example, a portion extending within 5% of the coating thickness or extending within a thickness of 1.0 μm. part.

[0026] In order to obtain a greater friction reducing effect, it is desirable to minimize the hydrogen content in the outermost surface portion of the hard carbon coating in the first embodiment. The average hydrogen content of the outermost surface portion of the ha...

Embodiment 1

[0080] First, a substantially semi-cylindrical steel piece (as a base) is cut from S45C steel (according to JIS G4051), and its size is 8×12×40 mm. A DLC coating (as an inner coating) having a hydrogen content of 20 atomic % and a thickness of 10 µm was formed on the semicylindrical surface of the cut piece by the CVD method. Then, another layer of DLC coating (as an outer coating) with a hydrogen content of 5 atomic % and a thickness of 0.5 μm was formed by PVD arc ion plating, thereby obtaining a test sample. Then, the test sample was subjected to the friction / wear test described below using polyalphaolefin oil without additives as a lubricating oil.

Embodiment 2

[0082] First, a substantially semi-cylindrical steel piece (as a base) is cut from S45C steel (according to JIS G4051), and its size is 8×12×40 mm. A DLC coating (as an inner coating) having a hydrogen content of 20 atomic % and a thickness of 10 µm was formed on the semicylindrical surface of the cut piece by the CVD method. Then, another layer of DLC coating (as an outer coating) with a hydrogen content of 0.5 atomic % and a thickness of 0.5 μm was formed by PVD arc ion plating, thereby obtaining a test sample. Then, friction / wear tests were performed on the test samples using polyalphaolefin oil without additives as lubricating oil.

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Abstract

There is provided a sliding member including a base body and a hard carbon coating formed on the base body to define a sliding surface for sliding contact with an opposing member under lubrication according to one embodiment of the present invention. The hard carbon coating has an outermost surface portion lower in hydrogen content than a remaining portion thereof, or an outermost coating layer lower in hydrogen content than at least one other coating layer.

Description

[0001] This application is a divisional application of an application with a filing date of August 6, 2004, an application number of 200410056325.8, and an invention title of "Sliding Part and Its Production Method". technical field [0002] The present invention relates to a sliding part, particularly a sliding part having a thin coating of hard carbon, such as diamond-like carbon, which exhibits excellent low-friction characteristics and durability in the presence of a specific lubricant. The invention also relates to a method of producing said slide. Background technique [0003] Global environmental problems such as global warming and the destruction of the ozone layer are imminent. Global warming is mainly caused by CO 2 Emissions impact, set CO 2 emission standards to reduce CO 2 Emissions have become a major concern of every country. In order to reduce CO 2 emissions, improving the fuel efficiency of vehicles is very important. Accordingly, it is desirable to re...

Claims

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Application Information

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IPC IPC(8): F16J9/26F02F3/00C23C28/04C23C16/26C23C14/06C10M105/14C10N40/00C10N40/25
Inventor 浜田孝浩加纳真马渕丰
Owner NISSAN MOTOR CO LTD