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Preparation and application methods of brazing filler metal used for brazing between high-silicon aluminum alloy and kovar alloy

A high-silicon aluminum alloy and alloy technology, which is applied in welding equipment, metal processing equipment, welding/cutting media/materials, etc., can solve the problems of difficult connection, large differences in properties, and different elements, and achieves relatively high performance differences. Large, uniform thickness, high brightness effect

Inactive Publication Date: 2019-09-27
HENAN POLYTECHNIC UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the above deficiencies, the present invention provides a method for preparing and using brazing filler metals for brazing high-silicon aluminum alloys and Kovar alloys. Larger, more difficult to connect issues

Method used

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  • Preparation and application methods of brazing filler metal used for brazing between high-silicon aluminum alloy and kovar alloy
  • Preparation and application methods of brazing filler metal used for brazing between high-silicon aluminum alloy and kovar alloy
  • Preparation and application methods of brazing filler metal used for brazing between high-silicon aluminum alloy and kovar alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A preparation method of brazing material for welding high-silicon aluminum alloy and Kovar alloy is completed according to the following steps:

[0040] S1, taking material: Weigh the raw material according to the mass percentage of 25%Al30Si, 23%Cu, 0.5%Ni and the balance is Al, the purity of the Al, Cu, Ni and Al30Si should be higher than 99.99%;

[0041] S2, Cleaning: Grind the weighed raw materials with sandpaper to remove oxides and oil stains on the surface; then put 23% Cu into HCl aqueous solution with a mass fraction of 10% for ultrasonic cleaning for 15 minutes, and then use deionized water Wash for 15 minutes, and finally put it into an alcohol-acetone solution with a volume ratio of 1:1 to wash it for 15 minutes, and dry the liquid on the surface of Cu with a hair dryer to obtain clean Cu raw materials; put 25% Al30Si, 0.5% Ni and Al into deionized water Clean for 15 minutes, and finally put it into an alcohol-acetone solution with a volume ratio of 1:1 to c...

Embodiment 2

[0058] The difference from Example 1 is: a preparation method of brazing material for welding high-silicon aluminum alloy and Kovar alloy, S1, taking material: 25% Al30Si, 23% Cu, 1% Ni and the balance is Al Weigh raw materials.

[0059] The brazing material obtained in this embodiment can make the welding joint of high-silicon aluminum alloy and Kovar alloy dissimilar materials reach 50.24MPa, and the sealing performance can reach 10 -8 Pa·m 3 Performance indicators below / s.

Embodiment 3

[0061] The difference from Example 1 is: a preparation method of brazing material for welding high-silicon aluminum alloy and Kovar alloy, S1, taking materials: 25% Al30Si, 23% Cu, 1.5% Ni and the balance being Al Weigh raw materials.

[0062] The brazing material obtained in this embodiment can make the welding joint of high-silicon aluminum alloy and Kovar alloy dissimilar materials reach 58.37MPa, and the sealing performance can reach 10 -8 Pa·m 3 Performance indicators below / s.

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Abstract

The invention discloses preparation and application methods of brazing filler metal used for brazing between dissimilar materials, namely a high-silicon aluminum alloy and a kovar alloy. The preparation method comprises the steps that raw materials are weighed according to the fact that the brazing filler metal is composed of, by mass percent, 15%-45% of an Al30Si alloy, 18%-30% of Cu, 0.5%-5% of Ni and the balance Al; the raw materials are ground and cleaned; the raw materials are subjected to high-temperature smelting; quenching is performed for preparing the foil-shaped brazing filler metal; and the like. The application method comprises the processes that to-be-welded surfaces are pretreated; the foil-shaped brazing filler metal is pretreated; and welding is performed. The preparation and application methods provided by the invention aim at solving the problems that the performance difference between the dissimilar materials, namely high-silicon aluminum and the kovar alloy is large, and welding is difficult; and the foil-shaped brazing filler metal prepared through the method is consistent in thickness and uniform in component, the brazing filler metal has metallurgical reaction with elements in high-silicon aluminum alloy and kovar alloy base materials in the high-temperature welding process, new phases are formed, and in addition, formed weld joints are good in continuity, high in compactness, high in connecting strength and can be widely applied to T / R module shell sealing.

Description

technical field [0001] The invention relates to the technical field of electronic packaging material engineering, in particular to a method for preparing and using a brazing filler metal for brazing high-silicon aluminum alloys and Kovar alloys. Background technique [0002] As an important connection method with good effect in the connection technology of high-silicon aluminum alloy and Kovar alloy dissimilar materials, brazing is to use (or automatically generate during the process) a solder with a lower melting temperature than the base metal, and the operating temperature is lower than that of the base metal. A welding technique in which the solidus of the base metal is higher than the liquidus of the solder. During brazing, the workpiece is often heated as a whole or evenly heated over a large area around the brazing seam, so the relative deformation of the workpiece and the residual stress of the welded joint are small; since the high-silicon aluminum alloy contains ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/40B23K35/28B23K1/008B23K1/19B23K1/20
CPCB23K1/008B23K1/19B23K1/20B23K1/206B23K35/286B23K35/40
Inventor 高增杨环宇王振江纪霏巴现礼邱得超楚军龙李子发王琰牛济泰
Owner HENAN POLYTECHNIC UNIV
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