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Aluminum alloy surface strengthening method using laser melting and coating

An aluminum alloy surface, laser cladding technology, applied in laser welding equipment, metal processing equipment, metal material coating technology and other directions, can solve the problems of excessive melting of aluminum alloy substrate, cracking of cladding layer, low melting point, etc. Prevent excessive melting and collapse, reduce interface thermal stress, good metallurgical compatibility

Inactive Publication Date: 2007-08-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The aluminum alloy has a low melting point, and its surface is clad with Ni-based, Co-based, Cu-based, Fe-based alloys or ceramic materials with high melting points, which may easily cause excessive melting of the aluminum alloy substrate and cause the substrate to collapse;
[0005] 2. Cladding layer cracking
[0006] 3. Cladding layer peeling off
Aluminum has a strong electronegative property and forms hard and brittle intermetallic compounds with Ni, Co, Cu, Fe and other elements. Although the intermetallic compounds increase the hardness of the cladding layer, they also make the bonding interface between the cladding layer and the substrate brittle. increase, causing the cladding layer to peel off

Method used

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  • Aluminum alloy surface strengthening method using laser melting and coating
  • Aluminum alloy surface strengthening method using laser melting and coating
  • Aluminum alloy surface strengthening method using laser melting and coating

Examples

Experimental program
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Effect test

Embodiment 1

[0064] 1. The surface pretreatment of aluminum alloy substrates, the process is as follows: first, use 500# metallographic sandpaper to polish the surface to be clad, then immerse in 10% sodium hydroxide aqueous solution for 2 minutes, take it out and wash it with clean water; the aluminum alloy substrate It is ZL102 alloy.

[0065] 2. Preparation of laser cladding materials: Al-Si alloy powder and SiC ceramic powder are used as laser cladding materials. The composition of Al-Si alloy is: Si content 10-15 (wt%), particle size: -140-+325. SiC particle size: -200. Prepare the cladding material according to the volume ratio of Al-Si alloy and SiC as 1:4, and then put it into a drum-type powder mixer for powder mixing, and the powder mixing time is 8 hours;

[0066] 3. Cladding preparation: the mixed cladding material is made into a paste with water glass, and coated on the surface of the aluminum alloy substrate, the thickness of the coating layer is 0.8mm, and dried in an argon...

Embodiment 2

[0069] 1. Substrate surface pre-treatment, the process is: first use 500# metallographic sandpaper to polish the surface to be clad, then immerse in 5% sodium hydroxide aqueous solution for 5 minutes, take it out and wash it with water; in order to prevent rapid oxidation again, Adopt nitric acid passivation process. The base material is ZL104 alloy.

[0070] 2. Preparation of laser cladding materials: Al-Si alloy powder and SiC ceramic powder are used as laser cladding materials. The composition of Al-Si alloy is: Si content 10~15, particle size: -140~+325. SiC particle size: -200. Prepare the cladding material according to the volume ratio of Al-Si alloy and SiC as 1:3, and then put it into a drum-type powder mixer for mixing powder, and the mixing time is 10h;

[0071] 3. Cladding preparation: make the mixed cladding material into a paste with water glass, coat it on the surface of the aluminum alloy substrate, the thickness of the coating layer is 1.0 mm, and dry it in a...

Embodiment 3

[0074] 1. The surface pretreatment of aluminum alloy substrates, the process is: first use 800# metallographic sandpaper to polish the surface to be clad, then immerse in 10% sodium hydroxide aqueous solution for 2 minutes, take it out and wash it with water; in order to prevent rapid Oxidation, passivation with nitric acid. The base material is LY12 alloy.

[0075] 2. Preparation of laser cladding materials: Al-Si alloy powder and SiC ceramic powder are used as laser cladding materials. The composition of Al-Si alloy is: Si content 10~15, particle size: -140~+325. SiC particle size: -200. Prepare the cladding material according to the volume ratio of Al-Si alloy and SiC as 1:2, and then put it into a drum-type powder mixer for powder mixing, and the powder mixing time is 10h;

[0076] 3. Cladding preparation: make the mixed cladding material into a paste with water glass, and coat it on the surface of the substrate. The thickness of the coating layer is 1.2mm, and dry it in...

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Abstract

The invention discloses a reinforcing method of aluminium alloy surface fused and covered by laser, which comprises the following steps: 1. predisposing aluminium alloy base; 2. allocating laser fusing and covering material with the bulk rate of Al-Si alloy powder and SiC ceramic powder at 1:(4-2); setting the Si content in the Al-Si alloy at 10-15(wt%) with grain size at - 140-+325; setting the grain size of SiC at -200; 2. modulating evenly blended fusing and covering material into paste through soluble glass; coating on the surface of aluminium alloy with thickness at 0.8-1.2mm; drying at 100-150 deg.c for 0.5-2h; 4. adopting crossflow CO2 laser to irradiate the coated layer on the surface of aluminium alloy base; setting the output power of laser at 3-4kW and optical beam scanning velocity at 2-5mm / s and optical spot dimension at 1-4mm; protecting fusing pond through high-purity argon in the laser fusing and covering course with argon flow at 20-30L / min.

Description

technical field [0001] The invention relates to a laser metal surface processing technology, specifically a laser cladding aluminum alloy surface strengthening method using a high-energy-density laser beam cladding SiC particle-reinforced Al-Si composite coating. The international patent main classification number is intended to be Int .C1 C23C 8 / 00 (2006.01). Background technique [0002] At present, in the laser cladding aluminum alloy surface strengthening technology, the cladding materials are mainly Ni-based, Co-based, Cu-based, Fe-based alloys or Al alloys. 2 o 3 , TiC, WC and other ceramic materials. For example, R.Volz (see Volz R. Laser Materials Processing, ICALEO'92, USA Florida, 1992.10.25-29, 1992:251-259. Volz R.ICALEO'92 Laser Materials Processing, Florida USA, 25-29 Oct, 1992: 251-259; Volz R. Laser Treating Materials, [European Conference Papers], 1992: 399-404.Volz R. Laser Treat Mater, [Pap.Eur.Conf.], 1992: 399-404) several Ni-based alloy powder is cl...

Claims

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Application Information

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IPC IPC(8): C23C24/10B23K26/34
Inventor 孙荣禄唐英雷贻文牛伟王云山
Owner TIANJIN POLYTECHNIC UNIV
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