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Carbon-based antifriction wear resistant coat and production method thereof

A wear-resistant coating, carbon-based technology, applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve the problems of difficult erosion/corrosion characteristics, anti-friction and wear-resisting characteristics, long life, and limited bearing capacity etc. to achieve the effect of improving corrosion/erosion resistance

Inactive Publication Date: 2015-06-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the preparation thickness of traditional graphite-like amorphous carbon coatings is mostly less than 5 μm, which makes it difficult to exert its excellent anti-friction and wear-resisting properties for a long life, and its load-carrying capacity is limited
At the same time, the traditional graphite-like amorphous carbon coating has a single interface structure, and its single-layer (substrate directly deposited graphite-like amorphous carbon layer) or double-layer (transition layer + graphite-like amorphous carbon layer) structure is difficult to interrupt the continuous growth defects. , providing a potential channel for the erosion / corrosion of water molecules or corrosive molecules, so it is difficult to show sufficient erosion / corrosion resistance in the water environment, resulting in a short service life

Method used

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  • Carbon-based antifriction wear resistant coat and production method thereof
  • Carbon-based antifriction wear resistant coat and production method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the above-mentioned carbon-based anti-friction and wear-resistant coating, which includes the following steps: pre-treating the substrate 100; performing plasma cleaning on the surface of the pre-treated substrate 100; The above-mentioned carbon-based anti-friction and wear-resistant coating is deposited on the surface of the substrate 100 . Generally, the base 100 in the present invention is a friction pair component for water environment, such as a hard-sealed valve, a water-lubricated bearing, and a water environment gear transmission member. Depositing the carbon-based anti-friction and wear-resistant coating of the present invention on the working surface of the substrate 100 can obtain a workpiece with excellent tribological properties.

[0035] In the preparation method of the present invention, the purpose of pretreatment and plasma cleaning is to expose the substrate 100 to a fresh surface, so that the ...

Embodiment approach

[0037] As a possible embodiment, the plasma cleaning includes the following steps: placing the pre-treated substrate 100 on the sample holder in the vacuum chamber of the magnetron sputtering system, and vacuuming it; -3 When Pa and below, enter Ar gas and adjust the air pressure to 1Pa~10Pa; turn on the bias power supply, adjust the bias voltage to 500V~1000V, and the bias duty ratio to 40%~60%; Excited into plasma, the surface of the pretreated substrate 100 is etched, and the etching time is 5 minutes to 50 minutes. Plasma cleaning is to use high-energy particles to bombard the surface of the substrate 100, which can remove stubborn stains or scale remaining in the pretreatment, so that the surface of the substrate 100 has a higher degree of cleanliness and enhance the deposition quality of subsequent coatings.

[0038] Compared with the graphite-like amorphous carbon coating, the bonding layer 200 in the present invention has better compatibility with the friction pair par...

Embodiment 1

[0047] The carbon-based anti-friction and wear-resistant coating is prepared on the hard sealing surface of the titanium alloy ball valve. In this embodiment, the substrate 100 is a titanium alloy ball valve, the bonding layer 200 is a metal Ti film, and the metal Ti film and graphite-like amorphous carbon film are alternately deposited to form a composite coating with a thickness of 45 μm. The specific implementation steps are as follows:

[0048] 1) Pretreatment

[0049] Use ordinary detergent to treat the substrate 100 to remove oil stains on the hard sealing surface of the titanium alloy ball valve and impurities absorbed during processing, transportation or long-term storage; then sandblast the hard sealing surface of the titanium alloy ball valve, Remove the oxide film and machining burrs; then use an industrial cleaning agent to ultrasonically clean the hard sealing surface of the titanium alloy ball valve to further remove the physical and chemical adsorbates on the su...

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Abstract

The invention provides a carbon-based antifriction wear resistant coat and a production method thereof. The carbon-based antifriction wear resistant coat is a multilayer film structure formed through alternative deposition of a bonding layer and a working layer; the bonding layer is a film of simple substance or nitride or carbide of one of Ti, Cr and W elements, or a film of the Si element; and the working layer is a graphite-like amorphous carbon film, and the atom percentage content of the graphite structure in the graphite-like carbon film is not lower than 70%. The alternative deposition of the bonding layer and the working layer realizes heavy gauge production of the graphite-like amorphous carbon coat, so the water environment friction performance of the graphite-like amorphous carbon coat is stable for a long time; and the above alternative deposition multi-interface design improves the corrosion / erosion resistance of the graphite-like amorphous carbon coat in various water-based fluid environments.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a carbon-based friction-reducing and wear-resistant coating and a preparation method thereof. Background technique [0002] For friction pair components such as hard-sealed valves, water-lubricated bearings, and water-environment gear transmission parts, the low-lubrication characteristics of the water medium make it often in a semi-dry friction state when it is frequently opened / closed (or started / stopped) and instantaneously overloaded , the coefficient of friction between the frictional contact surfaces will increase sharply, and the accompanying wear damage will also increase sharply. When there are acids, alkalis and salts in the water-based fluid, its chemical or electrochemical corrosion characteristics will further aggravate the friction and wear of the working surfaces of such friction pairs. Therefore, friction and wear are the key issues that restrict the ...

Claims

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Application Information

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IPC IPC(8): C23C14/35C23C14/02C23C14/06B32B15/04B32B9/04
Inventor 王永欣王立平李金龙薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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