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A method for surface treatment of dispersed aluminum copper

A surface treatment, aluminum-copper technology, applied in the field of metal surface treatment, to achieve the effect of increasing the weldability of the workpiece, uniform thickness of the nickel layer, and reducing the stress of the workpiece

Active Publication Date: 2022-04-29
XIAN SEAL ELECTRONICS MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the interface reaction during brazing of dispersed aluminum and copper, the present invention provides a surface treatment method for dispersed aluminum and copper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071]The dispersed aluminum copper bottom plate with Al2O3 content of 0.3% is used using 200# brown corundum sand, and the blasting machine pressure is 0.5MPa, and the sandblasting treatment is carried out. The bottom plate after sandblasting is tied to the electroplating fixture, and then the electroplating fixture is placed in the ultrasonic oil removal tank, the ultrasonic oil removal tank is a mixture of pure water and neutral phosphorus-free oil removal powder, the concentration of the oil removal powder is 4% (compared with the volume of pure water), the use temperature is 72 °C, and the ultrasonic time is 4min. The bottom plate after ultrasonic degreasing is put into the electric release oil tank, further cleaning, the electric release oil tank is a mixed solution of the electric release oil powder and pure water, the proportion concentration is 60g / L, the use temperature is 70 °C, and the electrolysis time is 40S. The product after the electric release of oil is washed a...

Embodiment 2

[0073]The dispersed aluminum copper bottom plate with Al2O3 content of 1.1% was used using 280# brown corundum sand and the blasting machine pressure was 0.6MPa for sandblasting treatment. The blasted bottom plate is tied to the electroplating hanger, and then the electroplating fixture is placed in the ultrasonic degreasing tank, the ultrasonic degreasing tank is a mixture of pure water and neutral phosphorus-free degreasing powder, the concentration of the degreasing powder is 5% (compared with the volume of pure water), the use temperature is 74 ° C, and the ultrasonic time is 3min. The bottom plate after ultrasonic degreasing is put into the electric release oil tank, further cleaning, the electric release oil tank is a mixed solution of the electric release oil powder and pure water, the proportion concentration is 80g / L, the use temperature is 72 °C, and the electrolysis time is 60S. The product after the electric release of oil is washed at room temperature, and the washed...

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Abstract

The surface treatment method of dispersed aluminum and copper of the invention adopts a neutral phosphorus-free degreasing agent, reduces environmental pollution, changes the pickling treatment method before electroplating, and reduces coating defects caused by pretreatment. Electroless nickel plating is added to ensure uniform thickness of the nickel layer, increase the firmness of the nickel layer and the weldability of the workpiece. The annealing process after electroplating is added to reduce the stress of the workpiece and at the same time make the nickel layer penetrate into the substrate and make the plating layer more compact. Using the surface-treated dispersed aluminum-copper of the present invention reduces interface reaction after brazing, improves product yield, and increases economic benefits.

Description

Technical field [0001] The present invention relates to the field of metal surface treatment technology, specifically a diffuse aluminum copper surface treatment method. Background [0002] With the increasing degree of chip integration, the demand for high-power package shell is more and more, the requirements for heat dissipation performance are also getting higher and higher, the base plate or hot sink of the high-power shell is mostly anaerobic copper or copper matrix composite material, diffusion aluminum copper has a thermal conductivity and thermal expansion coefficient close to copper, but the high temperature strength performance is better than copper, becoming a better choice for high-performance high-power package shell bottom plate. [0003] Since the high-power shell baseplate is brazed to the housing, the enhancement of the performance of diffuse aluminum-copper comes from the addition of Al 2 O 3 Granules, Al 2 O 3 The thermal stability of the particles is excelle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/02C23C18/32C23G1/02C25D3/12
CPCC23C28/02C25D3/12C23G1/02C23C18/32C23C18/1653
Inventor 朱训
Owner XIAN SEAL ELECTRONICS MATERIAL TECH CO LTD