Preparation method of amorphous alloy coating on surface of magnesium alloy

A technology of amorphous alloy and magnesium alloy, which is applied in the field of surface modification and coating of magnesium alloy materials, and can solve problems such as thermal damage on the surface of magnesium alloys

Inactive Publication Date: 2017-11-10
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-temperature cold spray preparation method for amorphous alloy coating on the surface of magnesium alloy, which overcomes the shortcomings of oxidation, crystallization and thermal damage to the surface of magnesium alloy in the preparation process of existing high-temperature technology.

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  • Preparation method of amorphous alloy coating on surface of magnesium alloy
  • Preparation method of amorphous alloy coating on surface of magnesium alloy

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preparation example Construction

[0023] The invention discloses a method for preparing a low-temperature cold spray coating of an amorphous alloy coating on the surface of a magnesium alloy, which comprises the following steps:

[0024] (1) Raw powder material of amorphous alloy: Al with powder particle size 85 Y 10 Ni 5 Aluminum-based amorphous alloy powder is used as raw material. The powder is sieved, and the powder with a particle size distribution of 5-25 μm is selected as the original powder material for cold spraying.

[0025] (2) Magnesium alloy substrate surface treatment: Use 400-1200 No. metallographic sandpaper to polish the magnesium alloy surface, and then clean the workpiece surface with acetone or alcohol to remove oil stains and surface oxide scales to improve the bonding between the coating and the substrate strength.

[0026] (3) Preparation of amorphous alloy coating:

[0027] The first step is to use an electronic balance to weigh the original Al with a particle size of 5-25 μm 85 Y ...

Embodiment example 1

[0031] (1) The magnesium alloy is pre-polished with No. 400 metallographic sandpaper to achieve a smooth surface and remove surface oxide skin. Then use No. 600 and No. 1200 metallographic sandpaper for grinding treatment in turn, and finally use alcohol to ultrasonically clean the matrix sample for 5 minutes, take it out and dry it.

[0032] (2) Use an electronic balance to weigh Al with a particle size distribution of 5-25 μm 85 Y 10 Ni 5 2 kg of aluminum-based amorphous alloy powder. Put the powder into a vacuum drying oven and vacuumize to 0.5×10 -3 Pa, the drying temperature is set at 80° C., and the drying time is 10 hours.

[0033] (3) Pour the dried powder into the powder feeder, and use an 80-mesh filter screen at the lower end of the drain. The powder feeder is connected to a high-pressure gas tank, the gas is helium with a purity >99.9%, the gas pressure is 2MPa, and the temperature of the gas heater is set at 300°C. The distance between the outlet of the spra...

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Abstract

The invention provides a preparation method of an amorphous alloy coating on the surface of a magnesium alloy. The preparation method comprises the steps that Al85Y10Ni5 aluminum base amorphous alloy powder is dried for 8-12 h at 80 DEG C, wherein a drying oven is vacuumized to be 10<2>-10<3> Pa; and the alloy powder is placed into a cold spraying system, a high-pressure gas serves as the gas source, the gas pressure is 1.5-3 MPa, the powder feeding amount is controlled to be 10-12 g / min, and it is guaranteed that the alloy powder is sprayed out of a spray gun at the speed of 500-1200 m / s. According to the preparation method provided by the invention, a low-temperature cold spraying mode is adopted, the powder particle temperature is not greater than 150 DEG C, the Al85Y10Ni5 aluminum base amorphous alloy powder is kept in a solid state in the whole spraying process and free of the fusion phenomenon, and therefore, the amorphous alloy powder is free of oxidation and phase change phenomena; and high-speed flying particles deposit to form the coating after colliding with the surface of a substrate at a high speed, the material of the coating has an amorphous structure consistent with that of the original powder, amorphous oxidation and crystallization do not exist, and the compact amorphous alloy coating with the complete amorphous structure can be obtained.

Description

【Technical field】 [0001] The invention relates to surface modification and coating technology of magnesium alloy materials, in particular to a preparation method of amorphous alloy coating on the surface of magnesium alloy. 【Background technique】 [0002] Magnesium alloys have excellent properties such as low density, high specific strength and specific stiffness, good thermal and electrical conductivity, and good biocompatibility. However, magnesium atoms are relatively active, resulting in poor corrosion resistance of magnesium alloys, which greatly limits the development and application of magnesium alloys. The coating made of amorphous alloy material has a unique structure of long-range disorder and short-range order in its atomic arrangement, without crystal defects such as grain boundaries and dislocations, and has a series of excellent physical and chemical properties, such as high strength, High hardness, excellent corrosion resistance, wear resistance, etc. [000...

Claims

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Application Information

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IPC IPC(8): C23C24/08C22C45/08
CPCC23C24/087C22C45/08
Inventor 王强牛文娟王快社高原王文
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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