Method for preparing high-silicon coating on aluminum alloy surface

A technology of aluminum alloy surface and casting aluminum alloy, applied in metal material coating process, coating, solid-state diffusion coating, etc. The effect of improving, good wear resistance and prolonging service life

Inactive Publication Date: 2012-07-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, aluminum and its alloy materials, as a sunrise industry, have an unstoppable development trend due to their own advantages. However, the performance of pure aluminum cannot meet the demand in most...

Method used

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  • Method for preparing high-silicon coating on aluminum alloy surface
  • Method for preparing high-silicon coating on aluminum alloy surface
  • Method for preparing high-silicon coating on aluminum alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Under the protection of argon atmosphere, with 7 kW cross-flow CO 2 The laser strengthens the preset layer, and the laser cladding process parameters are: P=2 kW, scanning speed V=100 mm / min, and spot diameter D=4 mm, so as to prepare a silicon coating on the aluminum alloy surface.

[0023] The laser-treated sample was placed in a conventional heat treatment furnace for diffusion heating treatment. The diffusion heating temperature was set at 450 °C and the holding time was set at 36 h, so as to prepare a high-silicon aluminum alloy with a gradient distribution of silicon content and microhardness, as shown in figure 1 As shown in a, the silicon content gradually decreases from the surface to the matrix; figure 1 As shown in b, the microhardness of the high-silicon coating is 250-320 HV, which is significantly higher than that of the substrate, and the cladding layer is well bonded to the substrate.

Embodiment 2

[0025] Under the protection of argon atmosphere, with 7 kW cross-flow CO 2 The laser strengthens the preset layer, and the laser cladding process parameters are: P=2.4 kW, scanning speed V=300 mm / min, and spot diameter D=4 mm, so that a silicon coating is prepared on the aluminum alloy surface.

[0026] The laser-treated sample was placed in a conventional heat treatment furnace for diffusion heating treatment. The diffusion heating temperature was set at 500 °C, and the holding time was set at 36 h, so as to prepare a high-silicon aluminum alloy with a very small silicon content and a gradient distribution of microhardness, such as figure 2 As shown in a, the silicon content gradually decreases from the surface to the matrix; figure 2 As shown in b, the microhardness of the high-silicon coating is 300-320 HV, the hardness increase is the most obvious, and the cladding layer is well bonded to the substrate.

Embodiment 3

[0028] Under the protection of argon atmosphere, with 7 kW cross-flow CO 2 The laser strengthens the pre-set layer. The laser cladding process parameters are: P=2.8 kW, scanning speed V=500 mm / min, and spot diameter D=4 mm, so that a silicon coating is prepared on the aluminum alloy surface.

[0029] The laser-treated sample was placed in a conventional heat treatment furnace for diffusion heating treatment. The diffusion heating temperature was set at 550 °C and the holding time was set at 36 h, thereby preparing a high-silicon aluminum alloy with a very small silicon content and a gradient distribution of microhardness, as shown in image 3 As shown in a, the silicon content gradually decreases from the surface to the matrix; image 3 As shown in b, the microhardness of the high-silicon coating is 250-320 HV, which is significantly higher than that of the substrate, and the cladding layer is well bonded to the substrate.

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Abstract

The invention discloses a method for preparing a high-silicon coating on an aluminum alloy surface. The method comprises the steps that: firstly, the aluminum alloy surface is ground and polished and is soaked in NaOH solution with the mass percentage of 5 percent for blackening treatment, then, acetone and alcohol are used for cleaning and drying in the air, Si powder and light absorption paint capable of enhancing the CO2 laser absorption rate are uniformly stirred and are then uniformly coated on the surface of an aluminum alloy covered base body to be melted, and the preset coating thickness is within 3mm; under the argon gas atmosphere protection, and a 7kW transverse flow CO2 laser is used for carrying out laser enforcement on the preset layer; samples after laser enforcement treatment are placed in a vacuum condition to be heated to 450 DEG C to 550 DEG C, in addition, the heat insulation is carried out for 36 hours, and the high-silicon coatings are prepared. The method has the advantages that the goal of improving the silicon content of the aluminum alloy surface is realized, the laser-assisted siliconizing technology combining laser melting cladding and diffusion heating is adopted, the high-silicon aluminum alloy with high surface hardness and high internal roughness is prepared, and the high-silicon aluminum alloy has the characteristics that certain depth requirements are met, the hardness is high, the abrasion performance is good, and the like.

Description

technical field [0001] The invention relates to a metal surface modification method, in particular to a method for preparing a high-silicon coating on the surface of an aluminum alloy by adopting a laser-assisted siliconizing technology. Background technique [0002] Aluminum and aluminum alloys have the advantages of light specific gravity, high specific strength, good corrosion resistance, good electrical and thermal conductivity, non-magnetic, good toughness, etc., and the content of aluminum resources on the earth is abundant, and its content is second only to oxygen and silicon, so it shows Broad application prospects. With the rapid development of modern industry, the technical level of the aluminum industry has reached a very high level, and the production scope has spread all over the world. At present, aluminum and aluminum alloys are still the largest users in the use of materials. Therefore, aluminum and its alloy materials, as a sunrise industry, have an unsto...

Claims

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Application Information

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IPC IPC(8): C23C10/30C23C24/10
Inventor 席珍强周成菊杜平凡徐敏
Owner ZHEJIANG SCI-TECH UNIV
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