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Preparation method of diamond-like carbon film on magnesium alloy surface

A diamond and magnesium alloy technology, which is applied in the field of magnesium alloy surface treatment, can solve the problems of elastic modulus and hardness difference, low magnesium alloy electrode potential, easy peeling and failure of the film, etc., and achieve high hardness, dense coating, and coating Effects with controllable layer structure

Active Publication Date: 2020-03-20
CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still two key problems in the research field of magnesium alloy materials: one is that magnesium alloys have low electrode potential and poor corrosion resistance, and severe corrosion will occur in humid air, sulfur-containing atmospheres, oceans, and human environments; Magnesium alloy is soft in texture and low in hardness. As a structural material, it is easy to cause components to be scrapped due to wear and tear.
[0007] However, there is a significant difference in elastic modulus and hardness between the magnesium alloy substrate and the DLC film, which has become a key factor restricting the application of DLC film surface modified magnesium alloys.
On the one hand, it is difficult to prepare high-hardness DLC films on the surface of magnesium alloy, a material with high chemical activity and soft texture.
On the other hand, high residual stress inevitably accumulates during the thin film deposition process, which not only leads to poor adhesion of the film base, easy peeling and failure of the film, but also greatly restricts the growth of thick films, which greatly limits its application.

Method used

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  • Preparation method of diamond-like carbon film on magnesium alloy surface
  • Preparation method of diamond-like carbon film on magnesium alloy surface
  • Preparation method of diamond-like carbon film on magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A. Perform acetone cleaning and sand blasting roughening treatment on the surface of the magnesium alloy substrate in sequence to obtain a treated substrate. The sandblasting pressure is 1.0MPa, the sandblasting time is 30s, and the number of sand shot used for sandblasting is 200 mesh.

[0035] B. Spraying a layer of cold sprayed WC-17Co coating with a thickness of 300 μm on the substrate obtained in step A by using cold spraying technology, and obtaining the cold sprayed intermediate layer on the surface of the magnesium alloy substrate. The process parameters of cold spraying are: the working gas preheating temperature is 800°C, the pressure is 3.0MPa, the spraying distance is 20mm, the spray gun moving speed is 400mm / s, and the spraying gas is helium.

[0036] C. Mechanically polish the cold sprayed WC-17Co coating obtained in step B to make the roughness Ra reach 0.4.

[0037] D. In the magnetron sputtering equipment, deposit a diamond-like carbon film with a thic...

Embodiment 2

[0041] A. Perform acetone cleaning and sand blasting roughening treatment on the surface of the magnesium alloy substrate in sequence to obtain a treated substrate. The sandblasting pressure is 0.5MPa, the sandblasting time is 20s, and the number of sand shot used for sandblasting is 100 mesh.

[0042] B. Spraying a layer of 316L stainless steel coating with a thickness of 1 mm on the substrate obtained in step A by using cold spray technology, and obtaining the cold sprayed intermediate layer on the surface of the magnesium alloy substrate. The process parameters of cold spraying are: the working gas preheating temperature is 600°C, the pressure is 2.5MPa, the spraying distance is 30mm, the moving speed of the spray gun is 200mm / s, and the spraying gas is nitrogen.

[0043] C. Mechanically polishing the cold-sprayed intermediate layer obtained in step B to make its roughness Ra reach 0.1.

[0044] D. In a magnetron sputtering device, deposit a diamond-like carbon film with a...

Embodiment 3

[0047] A. Perform acetone cleaning and sand blasting roughening treatment on the surface of the magnesium alloy substrate in sequence to obtain a treated substrate. The sandblasting pressure is 0.5MPa, the sandblasting time is 10s, and the number of sand shot used for sandblasting is 40 mesh.

[0048] B. Spraying a layer of 500 μm thick 420 stainless steel coating on the substrate obtained in step A by cold spraying technology, and obtaining the cold sprayed intermediate layer on the surface of the magnesium alloy substrate. The process parameters of cold spraying are: the working gas preheating temperature is 700°C, the pressure is 3.0MPa, the spraying distance is 20mm, the moving speed of the spray gun is 50mm / s, and the spraying gas is nitrogen.

[0049] C. Mechanically polishing the cold-sprayed intermediate layer obtained in step B to make its roughness Ra reach 0.2.

[0050] D. In a magnetron sputtering device, deposit a diamond-like carbon film with a thickness of 2 μm...

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Abstract

The invention provides a preparation method of a diamond-like carbon film on the surface of magnesium alloy. The preparation method is characterized by comprising the following steps that (1) the surface of a magnesium alloy base material is cleaned and is subjected to sand-blasting roughening treatment, so that the treated base material is obtained; (2) a metal or metal ceramic coating is sprayed on the surface of the base material through cold spraying, and thus a cold-spayed intermediate layer is obtained on the surface of the magnesium alloy base material; (3) the cold-sprayed intermediate layer is polished, so that the set roughness is obtained; and (4) the polished magnesium alloy base material provided with the cold-sprayed intermediate layer is placed in magnetron sputtering deposition equipment, and a diamond-like carbon film is prepared on the surface of the cold-sprayed intermediate layer after coating technological parameters are set. Compared with the prior art, the cold-sprayed metal or metal ceramic coating is used as the intermediate layer, so that the heat effect on the magnesium alloy base material is small, oxidization and deformation of the base material are avoided, and the coating is compact in bonding and has high bonding strength; and the preparation method is simple in process and environmentally friendly, and the structure of the coating can be controlled.

Description

technical field [0001] The invention relates to an alloy surface treatment method, in particular to a magnesium alloy surface treatment method. Background technique [0002] Magnesium alloy has excellent characteristics such as low density, high specific strength, good damping performance and biocompatibility, and has broad application prospects in transportation, aerospace, information, and medical fields. However, there are still two key problems in the research field of magnesium alloy materials: one is that magnesium alloys have low electrode potential and poor corrosion resistance, and severe corrosion will occur in humid air, sulfur-containing atmospheres, oceans, and human environments; Magnesium alloy is soft in texture and low in hardness. As a structural material, it is easy to cause components to be scrapped due to wear and tear. Preparation of wear-resistant and corrosion-resistant surface modification coating materials on magnesium alloy substrates is considere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/06C23C14/02C23C24/08C23C28/00
CPCC23C14/024C23C14/025C23C14/0605C23C14/35C23C24/085C23C28/343
Inventor 陈杰宋惠马冰刘光舒文波崔烺冯胜强郑子云戴宇贾利赵健
Owner CHINA WEAPON SCI ACADEMY NINGBO BRANCH
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