A Welding Method of Kovar Alloy and Titanium Alloy Based on Silver Intermediate Layer

A welding method and titanium alloy technology, which is applied in the field of material welding, can solve the problems of multi-application limitations and high assembly requirements, and achieve the effects of excellent mechanical properties, low assembly requirements, and grain refinement and reduction

Active Publication Date: 2021-01-01
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness of the middle layer of the double sandwich scheme needs to be strictly designed, and the assembly requirements during welding are high, and there are many application limitations.

Method used

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  • A Welding Method of Kovar Alloy and Titanium Alloy Based on Silver Intermediate Layer
  • A Welding Method of Kovar Alloy and Titanium Alloy Based on Silver Intermediate Layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Use 4J29 Kovar alloy, TC4 titanium alloy and silver foil samples with a purity of 99wt%, grind the surface of the sample to be welded, and put the polished sample into acetone or sodium carbonate solution for ultrasonic cleaning for 15 minutes. For Kovar alloy, use 20% sulfuric acid solution to remove the oxide film, and then ultrasonic cleaning with alcohol for 5 minutes, for titanium alloy and silver, use a mixed solution of hydrofluoric acid and nitric acid to remove the oxide film, and then ultrasonic cleaning with alcohol for 5 minutes. Place the 0.8mm thick silver foil between the Kovar alloy and the titanium alloy, fix it with a clamp, and clamp it. When clamping the sample, control the maximum gap between the adjacent sample materials to not exceed 0.1mm, specifically as follows figure 2 As shown, the welding surfaces of Kovar alloy, titanium alloy and silver foil are on the same plane. The fixed sample is placed in the vacuum chamber of the vacuum electron bea...

Embodiment 2

[0021] The same sample cleaning and placement method as in Example 1 was used to weld the Kovar alloy and the titanium alloy. The thickness of the silver foil is 0.5mm, the accelerating voltage is 55kV, the electron beam current is 8mA, and the welding speed is 6mm / s. The injection position of the electron beam is located in the middle of the silver foil, and the welding starts when the vacuum degree of the welding chamber is higher than 0.1Pa. After welding, wait for the sample to cool down, then open the vacuum chamber of the welding machine, take out the sample, and obtain a composite component of Kovar alloy and titanium alloy. The flat butt welds obtained by using the above welding specifications are well formed, and there are no defects such as cracks, incomplete penetration and incomplete fusion inside the welds, no visible inclusions, and no pores.

Embodiment 3

[0023] The same sample cleaning and placement method as in Example 1 was used to weld the Kovar alloy and the titanium alloy. The thickness of the silver foil is 0.4mm, the accelerating voltage is 45kV, the electron beam current is 7mA, and the welding speed is 5mm / s. The injection position of the electron beam is located in the middle of the silver foil, and the welding starts when the vacuum degree of the welding chamber is higher than 0.1Pa. After welding, wait for the sample to cool down, then open the vacuum chamber of the welding machine, take out the sample, and obtain a composite component of Kovar alloy and titanium alloy. The flat butt welds obtained by using the above welding specifications are well formed, and there are no defects such as cracks, incomplete penetration and incomplete fusion inside the welds, no visible inclusions, and no pores.

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Abstract

The invention discloses a welding method of a Kovar alloy and a titanium alloy based on a silver intermediate layer. The welding method comprises the following specific steps: step (1). cleaning the surfaces of the Kovar alloy, the titanium alloy and a silver foil; step (2). placing the silver foil between the kovar alloy and the titanium alloy, fixing and clamping by using a clamp; step (3). putting a sample in a vacuum chamber, setting the welding parameters of an electron beam, and setting the injection position of the electron beam; and step (4). welding by using an electron beam welder. According to the dissimilar metal welding method of the Kovar alloy and the titanium alloy, silver is used as an intermediate transition layer, and can effectively prevent the formation of brittle intermetallic compounds in the welding process; special pre-weld and post-weld treatment is not needed; and an obtained joint has the advantages of high tensile strength, no pores and cracks and the like.

Description

technical field [0001] The invention relates to a dissimilar metal electron beam welding method, in particular to a dissimilar metal electron beam welding method based on an intermediate layer of Kovar alloy and titanium alloy, and belongs to the technical field of material welding (connection). Background technique [0002] Kovar alloy has a wide range of applications in the field of electronic packaging due to its linear expansion coefficient being close to that of glass, sapphire and other materials. With the continuous expansion of packaging scale, the requirements for lightweight packaging components are getting higher and higher, especially in the field of cryogenic packaging. Larger, the heat loss of the components will be aggravated. Titanium alloy materials have shown great advantages due to the characteristics of low density, low thermal conductivity, low outgassing, and high strength. Since the Dewar needs to maintain a vacuum state during low-temperature packag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/06B23K15/00
CPCB23K15/00B23K15/0006B23K15/0046B23K15/06
Inventor 莫德锋汪洋余利泉龚海梅
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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