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Low-pressure cold spraying copper-based self-lubrication coating and preparation method thereof

A self-lubricating coating and cold spraying technology, applied in the field of surface lubrication and protection of metal materials, can solve the problems of insignificant lubrication effect and wear, and achieve the effects of low spraying cost, uniform and dense coating, and good wear resistance.

Active Publication Date: 2018-09-04
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, in the research of copper-based self-lubricating coatings, the literature [Tribology letter 2016, 62(9):1-12] adopts high-pressure (>1.0 MPa) cold spray prepared Cu-MoS 2 Compared with pure copper coating, the composite coating has good lubricating effect but also has the disadvantages of serious wear; Cu-Al prepared by literature [Wear 2015, 336-337:96-107] 2 o 3 Composite coating can significantly improve the wear resistance of pure copper coating, but the lubricating effect is not obvious

Method used

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  • Low-pressure cold spraying copper-based self-lubrication coating and preparation method thereof

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Effect test

Embodiment 1

[0023] (1) Electrolytic copper powder with a particle size of about 20 μm (purity ≥99.0%), polygonal alumina powder with a particle size of 2 to 10 μm (purity ≥98.0%) and flake copper-clad graphite powder with a particle size of about 47 μm (purity ≥ 98.0%) as a spraying powder, wherein the weight percentages of copper, alumina and copper-coated graphite powder are 80%, 10% and 10% respectively; then the three powders are mixed evenly and placed in a vacuum drying oven at 80 °C Dry for 1 h.

[0024] (2) The low-pressure cold spraying equipment uses the three-dimensional numerical control slide rail as the spraying manipulator, and the surface of the 304 stainless steel sheet after polishing with 300-500 mesh tungsten carbide sandpaper and ultrasonic cleaning in acetone solution is coated with 80-100 mesh polygonal alumina at 0.80 MPa Under gas pressure, it is subjected to 45° sandblasting treatment, the sandblasting distance is 25 mm, and the sandblasting moving speed is 25 mm...

Embodiment 2

[0027] (1) Electrolytic copper powder with a particle size of about 30 μm (purity ≥99.0%), polygonal alumina powder with a particle size of 4-20 μm (purity ≥98.0%) and flake copper-clad graphite powder with a particle size of 30-60 μm (purity ≥98.0%) as spraying powder, which is composed of 68% electrolytic copper, 12% polygonal alumina powder and 20% copper-clad graphite powder, mixed evenly and placed in a vacuum drying oven to dry at 75 °C 2 h.

[0028] (2) Use low-pressure cold spraying equipment to polish the surface of 304 stainless steel sheet after polishing with 300-500 mesh tungsten carbide sandpaper and ultrasonically clean it in acetone solution. For sandblasting, the distance of sandblasting is 28 mm, and the speed of sandblasting is 28 mm / s; the distance between adjacent spraying paths is controlled to be 1 mm by CNC USB Controller software programming for coating preparation; the compressed air pressure is 0.85 MPa, and the gas heating temperature is 500 °C, th...

Embodiment 3

[0031] (1) Electrolytic copper powder with a particle size of about 15 μm (purity ≥99.0%), polygonal alumina powder with a particle size of 2-25 μm (purity ≥98.0%) and flake copper-clad graphite powder with a particle size of 25-75 μm (purity ≥98.0%) as spraying powder, its mass percentages were 62%, 8% and 30%, respectively, mixed evenly and dried in a vacuum oven at 75 °C for 2 h.

[0032](2) Use low-pressure cold spraying equipment to polish the surface of 304 stainless steel sheet after polishing with 300-500 mesh tungsten carbide sandpaper and ultrasonically clean it in acetone solution, and use 80-100 mesh polygonal alumina to perform 45° sandblasting under 0.80 MPa gas pressure The sandblasting distance was 30 mm, and the sandblasting speed was 30 mm / s; the coating preparation was programmed with CNC USB Controller software to control the distance between adjacent spraying paths to be 1 mm; the compressed air pressure was 0.80 MPa, and the gas heating temperature was 500...

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Abstract

The invention discloses a low-pressure cold spraying copper-based self-lubrication coating which comprises the following raw materials by weight percentage: 10-30% of copper-coated graphite, 8-12% ofaluminum oxide and the balance of copper. The invention further discloses preparation of the coating on the surface of stainless steel 304 by a low-pressure cold spraying technology. The coating is uniform in texture, is well combined with a substrate and has excellent mechanical properties and lubrication and antiwear performance. In addition, a preparation technology of the coating is green, environmentally friendly, convenient to operate and good in controllability; and the coating as a lubrication component in an oil-less or oil-lack environment has wide application prospects and an important practical value.

Description

technical field [0001] The invention relates to a low-pressure cold-sprayed copper-based self-lubricating coating and a preparation method thereof, belonging to the technical field of metal material surface lubrication and protection. Background technique [0002] In the fields of mechanical engineering, energy chemical industry and equipment manufacturing industry, the friction and wear of moving parts in the mechanical system seriously affects the precision, reliability and service life of the entire system. Therefore, the preparation of coatings with good self-lubricating properties and good mechanical properties on the surface of commonly used metal materials has a wide range of application requirements and important application value. Soft metal copper can play a good lubricating effect in the friction process because of its good ductility and easy shearing characteristics; however, there are problems such as oxidation, low hardness and poor bearing capacity in the prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04C22C9/00C22C32/00
CPCC22C9/00C22C32/00C22C32/0084C23C24/04
Inventor 杨军刘维民陈文元于源朱圣宇乔竹辉程军王帅
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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