A kind of ultrasonic brazing method of Kovar alloy and ceramic material

A technology of ultrasonic brazing and ceramic materials, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of increased residual stress of joints, reduced performance of joints, high production costs, etc., and accelerates metallurgical reactions , low production cost and short process time

Inactive Publication Date: 2018-08-14
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are mainly two problems in the traditional brazing connection process. On the one hand, the traditional brazing process needs to be carried out under vacuum conditions, and it takes a long time, the process is complicated, and the production cost is high; The brittle intermetallic compounds generated in the joint will increase the residual stress in the joint and reduce the performance of the joint

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A method for ultrasonic brazing of Kovar alloy and ceramic material, which comprises the following steps:

[0015] (1) Material cleaning: the Kovar alloy to be welded and Al 2 o 3 Ultrasonic cleaning of ceramics in acetone for 5 minutes;

[0016] (2) Assembly: Assemble Kovar alloy, ceramics and Cu-Sn-Ti-Ni solder into Al 2 o 3 "Sandwich" three-layer structure of ceramic / Cu-Sn-Ti-Ni / Kovar alloy;

[0017] (3) Ultrasonic brazing: place the three-layer structure of ceramic / brazing filler metal / Kovar alloy in step 2 on a heating table, and heat and pressurize to melt the brazing filler metal. The heating temperature is 830°C and the pressure is 1MPa. Start the ultrasonic vibration after the solder is melted, the vibration frequency is 30kHz, and the amplitude is 6μm; stop heating after the heating time lasts for 30s, and stop the pressure and ultrasonic vibration after the joint brazing seam layer is completely solidified to obtain a cutting alloy / ceramic brazing joint. ...

Embodiment 2

[0020] A method for ultrasonic brazing of Kovar alloy and ceramic material, which comprises the following steps:

[0021] (1) Material cleaning: the Kovar alloy to be welded and ZrO 2 Ceramics were ultrasonically cleaned in acetone for 8 minutes;

[0022] (2) Assembly: Assemble Kovar, ceramics and AgCuTi solder into ZrO 2 The "sandwich" structure of ceramic / AgCuTi / Kovar alloy is placed on the heating table;

[0023] (3) Ultrasonic brazing: Place the three-layer structure of ceramic / brazing material / Kovar alloy in step 2 on a heating table, heat and pressurize to melt the brazing material, wherein the heating temperature is 980°C, and the pressure is 0.2MPa. The pressure in the ultrasonic brazing continues until the end of the brazing; when the solder melts, the ultrasonic vibration is started, wherein the vibration frequency is 20kHz, and the amplitude is 10μm; the ultrasonic vibration continues until the solder is completely solidified. After the heating time lasted for 90...

Embodiment 3

[0026] A method for ultrasonic brazing of Kovar alloy and ceramic material, which comprises the following steps:

[0027] (1) Material cleaning: Put the Kovar alloy and AlN ceramics to be welded into acetone and ultrasonically clean them for 10 minutes;

[0028] (2) Assembly: Assemble Kovar alloy, AlN ceramic and Ag-Ti solder into a "sandwich" structure of ceramic / Ag-Ti / Kovar alloy, and place it on the heating table;

[0029] (3) Ultrasonic brazing: place the three-layer structure of ceramic / brazing filler metal / kovar alloy in step 2 on a heating table, heat and pressurize to melt the brazing filler metal, wherein the heating temperature is 940°C, and the pressure is 0.8MPa, Start the ultrasonic vibration after the solder is melted, the vibration frequency is 50kHz, and the amplitude is 1μm; stop heating after the heating time lasts for 60s, and stop the pressure and ultrasonic vibration after the joint brazing seam layer is completely solidified to obtain a cutting alloy / cera...

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PUM

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Abstract

The invention relates to a method for ultrasonic brazing of kovar alloy and ceramic material, which comprises the following steps: putting the kovar alloy and ceramic material to be welded into acetone and ultrasonically cleaning them for 5-10 minutes; Assemble with brazing material to form a three-layer structure of ceramic / brazing material / Kovar alloy; place it on a heating table and heat and pressurize it. The heating temperature is 830~980°C and the pressure is 0.2~1MPa. When the brazing material is melted, start the ultrasonic wave. Vibration, wherein the vibration frequency is 10-110kHz, and the amplitude is 1-10μm; stop heating after the heating time lasts 20-90s, stop pressurization and ultrasonic vibration after the joint brazing seam layer is completely solidified, and obtain a cutting alloy / ceramic brazing joint. The invention realizes the brazing connection of the kovar alloy and the ceramic material under the condition of non-vacuum and no brazing agent, and at the same time, the joint structure is refined, the residual stress level of the joint is low, and the joint has good sealing performance.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to an ultrasonic brazing method of Kovar alloy and ceramic material. Background technique [0002] Kovar alloy, also known as iron-nickel-cobalt alloy, has a high Curie point and good low-temperature structural stability. The oxide film of the alloy is dense, easy to weld and weld, has good plasticity, and can be machined. However, the inherent hardness and brittleness of ceramic materials make it difficult to process and manufacture, and they need to be connected with metals to achieve complementary properties with metals, in order to obtain ceramic-metal composite components with both excellent properties of ceramics and metals. Therefore, the connection of Kovar alloy and ceramic material has broad application prospects, and the sealing components of Kovar alloy and ceramic material are mostly used in devices in vacuum electronics, power electronics and other industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/06B23K1/20B23K103/18
CPCB23K1/06B23K1/206B23K2103/18
Inventor 赵洪运刘积厚李卓霖刘多宋晓国董红杰牛红伟赵一璇
Owner HARBIN INST OF TECH AT WEIHAI
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