Low-temperature brazing method for ceramics

A brazing method and ceramic technology, applied in the field of brazing, can solve problems such as poor interface bonding performance, low temperature of ceramic materials, and difficulty in realizing high-strength connections, so as to improve mechanical properties, improve microstructure and mechanical properties, reduce The effect of the difference in coefficient of thermal expansion

Inactive Publication Date: 2016-05-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the interfacial bonding performance between the plated metal and the ceramic substrate is usually poor, making low-temperature, high-strength bonding of ceramic materials still difficult to achieve

Method used

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Examples

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Effect test

Embodiment 1

[0032] A low-temperature brazing method, the ceramic base material selected is alumina ceramics, and the brazing filler metal is pure Sn brazing filler metal, and the specific steps are as follows:

[0033] 1) Take two cylindrical ceramic base materials 1 with a size of Ф5mm×5mm×5mm, and plate a layer of Ni layer with a thickness of 2 μm on the surfaces to be welded of the two ceramic base materials 1 by physical vapor deposition method;

[0034] 2) if figure 1 As shown, the Ni layer of the two ceramic base materials 1 is immersed in the molten Sn pool 2 respectively, and the ultrasonic probe 3 is placed 1000 μm above the Ni coating, and the ultrasonic vibration is turned on. The vibration frequency, power, time and amplitude used 30kHz, 100W, 1min and 5μm respectively, the vibration direction is perpendicular to the upper surface of the ceramic base material 1, remove the ultrasonic probe 3 after the vibration is over, and take out the obtained base material to be welded (wit...

Embodiment 2

[0038] A low-temperature brazing method, the ceramic base material selected is zirconia ceramics, and the solder is Sn-Bi solder, and the specific steps are as follows:

[0039] 1) Take two cylindrical ceramic base materials 1 (zirconia ceramics) whose dimensions are both Ф5mm×5mm×5mm, and plate a layer of 2 μm thick on the surface to be welded of the two ceramic base materials 1 by electroless plating process. Ni layer;

[0040] 2) if figure 1 As shown, the Ni layer of the two ceramic base materials 1 is immersed in the molten Sn pool 2 respectively, and the ultrasonic probe 3 is placed 100 μm above the Ni coating layer, and the ultrasonic vibration is turned on. The vibration frequency, power, time and amplitude used 30kHz, 100W, 5min and 5μm respectively, the vibration direction is perpendicular to the upper surface of the ceramic base material 1, after the vibration is over, remove the ultrasonic probe 3, and take out the obtained base material to be welded (with Sn metal...

Embodiment 3

[0044] A low-temperature brazing method, the ceramic base material selected is alumina ceramics, and the brazing filler metal is pure Sn-based brazing filler metal, and the specific steps are as follows:

[0045] 1) Take two cuboid ceramic base materials 1 whose dimensions are 4mm×4mm×3mm, and plate a layer of Ni layer with a thickness of 2 μm on the surfaces to be welded of the two ceramic base materials 1 respectively by electroplating process;

[0046] 2) if figure 1 As shown, the Ni layer of the two ceramic base materials 1 is immersed in the molten Sn pool 2 respectively, and the ultrasonic probe 3 is placed 100 μm above the Ni coating layer, and the ultrasonic vibration is turned on. The vibration frequency, power, time and amplitude used 30kHz, 100W, 2min and 5μm respectively, the vibration direction is perpendicular to the upper surface of the ceramic base material 1, remove the ultrasonic probe 3 after the vibration is over, and take out the obtained base material to ...

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Abstract

The invention discloses a low-temperature brazing method for ceramics. The method includes the steps that a to-be-welded surface of ceramic parent metal is plated with an active metal coating; the active metal coating is modified with ultrasonic waves; ultrasonic-assisted brazing is conducted. Particularly, the to-be-welded surface of ceramic parent metal is plated with one active metal coating through a coating technology; then the ceramic parent metal with the active metal coating is soaked in melt Sn, by means of a phonochemistry effect formed by the ultrasonic waves in the melt Sn medium, the bonding performance between the active metal coating and a ceramic matrix is improved, and a layer of Sn metal is attached to the surface of the active metal coating; low-melting-point brazing filler metal combined with the ultrasonic-assisted brazing technology is used for brazing the ceramic matrix coated with the Sn metal surface layer and the active metal middle layer at low temperature, and therefore low-temperature and high-strength connection of the ceramic material is achieved.

Description

technical field [0001] The invention belongs to the technical field of brazing, and in particular relates to a ceramic low-temperature brazing method. Background technique [0002] Ceramic materials have high hardness and excellent high-temperature physical and chemical stability, and are widely used in cutting tools, gas turbines, oxygen sensors, solid oxide fuel cells, optical instruments, electronic devices and other components. The extensive use of ceramic materials inevitably brings about the connection problems of this material. At present, the connection methods of ceramic materials that are widely used mainly include sintered metal powder connection, diffusion connection, brazing connection and so on. Among them, the brazing method has a low operating temperature, which can reduce the damage of high temperature to the base metal, and the residual stress of the joint after welding is small, so its application is the most common. In particular, for ceramic joints in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/00
CPCC04B37/006C04B2237/12C04B2237/123
Inventor 肖勇罗丹姜少堃黄尚宇杜学铭张元其王文涛
Owner WUHAN UNIV OF TECH
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