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Cold spray-coating method for composite solder of conduit and fin of aluminium alloy heat exchanger

A technology of heat exchangers and composite solders, applied in heat exchange equipment, tubular objects, metal processing equipment, etc., can solve the problems of complex procedures, low production efficiency and low yield of the hot rolling method, and simplify the preparation process , improve production efficiency, simple process effect

Inactive Publication Date: 2007-05-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the complex process of the existing NOCOLOK brazing process, unstable product quality control in the manufacturing process of composite aluminum foil, low production efficiency and low yield of finished products in the hot rolling method; Due to the difficult and unsafe application of the rolling method, a cold spraying method for aluminum alloy heat exchanger tubes and warp composite solder is provided. The specific technical solutions to solve the above problems are as follows:

Method used

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  • Cold spray-coating method for composite solder of conduit and fin of aluminium alloy heat exchanger

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specific Embodiment approach 1

[0010] Specific embodiment one: the steps of the preparation method of this embodiment are as follows:

[0011] Step 1. Al-Si solder, NOCOLOK brazing flux and Zn powder with an average particle diameter of 4.5-5.5 μm in an average particle diameter of 25-100 μm, the weight ratio of Al-Si solder to Zn is 9:3- 4, while the weight ratio of Al-Si solder and NOCOLOK solder is 9: 0.5~4, the weight ratio of Al-Si solder Si is 7~14%, the Al-Si solder, Zn powder and NOCOLOK solder Mix at a weight ratio of 9:3~4:0.5~4, then mix the mixed powder on a three-dimensional mixer for 4 to 5 hours to form a cold spray powder, and then mix the mixed powder at 90~110°C Drying treatment, the drying time is 2 to 4 hours, to make cold spray powder; Zn powder is used as an anti-corrosion additive element.

[0012] Step 2. Clean the surface of the aluminum substrate with industrial ethanol, and then make a cold spray powder after drying in step 1, and deposit it on the surface of the conduit and warp...

specific Embodiment approach 2

[0014] Specific embodiment two: The difference between this embodiment and specific embodiment one is that in step one, the Al-Si solder with an average particle diameter of 25 μm, the average particle diameter of Zn powder is 4.5 μm, and Si in the Al-Si solder The weight ratio is 8%, the above-mentioned Al-Si solder, Zn powder and NOCOLOK solder are mixed in a weight ratio of 9: 3: 0.5, and then the mixed powder is mixed on a three-dimensional mixer for 4 hours to form a cold spray powder , dry the mixed powder at 110°C for 4 hours to make cold spray powder; in step 2, the preheating temperature of the spraying gas is 380°C, the gas supply pressure is 1.5MPa, and the powder The supply rate was 20g / min, and the spraying distance was 20mm. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Specific embodiment three: the difference between this embodiment and specific embodiment one is that in step one, the Al-Si solder with an average particle diameter of 60 μm, the average particle diameter of Zn powder is 5 μm, and Si in the Al-Si solder The weight ratio is 12%. The above-mentioned Al-Si solder, Zn powder and NOCOLOK solder are mixed in a weight ratio of 9: 3.5: 2, and then the mixed powder is mixed on a three-dimensional mixer for 4.5 hours to form a cold spray powder, Dry the mixed powder at 100°C for 2 hours to make a cold spray powder; in step 2, the preheating temperature of the spraying gas is 400°C, the gas supply pressure is 2.5MPa, and the powder supply The rate is 15g / min, and the spraying distance is 25mm. Other steps are the same as in the first embodiment.

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Abstract

The invention discloses a preparing method of automobile aluminium alloy exchanger, which comprises the following steps: 1. blending Al-Si and Zn powder and brazing flux with weight rate at 9: 3-4: 0.5-4; drying; preparing cold spraying powder; 2. cleaning the conductor and fin surface; drying to make cold spraying powder; adopting cold-spraying method to sediment powder on the surface of conductor and fin; 3. assembling the base conductor; brazing according to NOCOLOK technique to obtain the product.

Description

technical field [0001] The invention relates to a preparation method of an automobile aluminum alloy heat exchanger. Background technique [0002] The production of aluminum heat exchangers is mainly assembled by brazing, and vacuum brazing and NOCOLOK methods are often used for connection. Among them, the NOCOLOK process is a flux brazing method, which has now developed into one of the main production methods of heat exchangers. This process uses a small amount of potassium fluoroaluminate flux (NOCOLOK), and there is no need to remove the flux after brazing, and the quality of the brazed joint is good. NOCOLOK flux is KF-AlF 3 The intermediate compound KAlF 4 and K 3 AlF 6 The eutectic composition is insoluble in water, can remove the oxide film on the surface of aluminum, and does not corrode aluminum. When using this brazing process, the brazing filler metal composition is based on the Al-Si eutectic alloy, and the addition amount of Si is generally 7% to 12% by we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/04B23K1/00B23K35/24B23K101/08B23K101/14
Inventor 杨建国吴京洧方洪渊刘雪松徐文立万鑫胡军峰
Owner HARBIN INST OF TECH
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