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
CN105541366AInactive Publication Date: 2016-05-04WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV OF TECH
Publication Date
2016-05-04
Estimated Expiration
Not applicable · inactive patent

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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.
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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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