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Brazing method capable of reducing residual stress on ceramic and metal joints

A technology of metal joints and residual stress, applied in metal processing equipment, welding media, welding equipment, etc., can solve the problems of large residual stress of brazed joints, difficult brazing connection, and can only be completed under high temperature vacuum or protective atmosphere , to achieve the effect of low brazing temperature and low residual stress level

Active Publication Date: 2013-07-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the existing technical problems such as difficulty in low-temperature brazing connection between ceramics and metals, large residual stress of brazed joints, brazing process can only be completed under high-temperature vacuum or protective atmosphere, etc., and proposes a method for reducing residual stress of ceramics and metal joints Brazing method

Method used

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  • Brazing method capable of reducing residual stress on ceramic and metal joints
  • Brazing method capable of reducing residual stress on ceramic and metal joints
  • Brazing method capable of reducing residual stress on ceramic and metal joints

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specific Embodiment approach 1

[0015] Specific embodiment one: the brazing method of reducing the residual stress of ceramics and metal joints in this embodiment is carried out according to the following steps: one, the parts to be welded are cleaned on the surface of ceramics and metals, and Al-Sn-Si-Zn The solder foil is placed between the ceramic and the metal surface to be connected or the Al-Sn-Si-Zn solder block is placed on the edge of the ceramic and metal lap gap to obtain the workpiece to be welded; 2. At an ultrasonic frequency of 20~ Under the conditions of 100kHz, amplitude 1-10μm, and brazing temperature 600-620°C, perform ultrasonic brazing on the brazing part for 4-30s, keep warm for 0-30min, then cool down with the furnace or air-cool to 300-500°C, and weld the joint Apply a longitudinal pressure of 0-100N, and continue to cool to room temperature with the furnace; that is, the reduction of the residual stress of the ceramic and metal joint is realized.

[0016] The joint shear strength can...

specific Embodiment approach 2

[0017] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the ceramics described in step one are SiC, Al 2 o 3 、Si 3 N 4 or TiC. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0018] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the metal in step 1 is TC4 or stainless steel. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a brazing method capable of reducing residual stress on ceramic and metal joints, relates to ceramic and metal brazing connection methods and solves the technical problems that low-temperature brazing connection for ceramic and metal is difficult, residual stress at the brazing joints is high, the brazing process can be completed in high-temperature vacuum or protective atmosphere only and the like. The brazing method includes: firstly, cleaning surfaces of to-be-brazed portions of ceramic and metal and placing solder foil between to-be-connected surfaces of ceramic andmetal or at the edge of a lapping gap of ceramic and metal; secondly, brazing ultrasonically, preserving heat and cooling, applying longitudinal pressure onto the brazed joints, and cooling the brazed joints along with a furnace until the temperature thereof reaches the room temperature. The brazing process is completed on the condition of atmosphere, the brazing temperature is low, and the residual stress on the ceramic / metal brazed joints is low.

Description

technical field [0001] The invention relates to a brazing connection method of ceramics and metals. Background technique [0002] Ceramics have excellent properties such as strong oxidation resistance, good wear resistance, high hardness, small thermal expansion coefficient, thermal shock resistance and chemical corrosion resistance. Therefore, it has broad application prospects in petroleum, chemical industry, machinery, aerospace, nuclear energy, optics and other fields. In order to give full play to the performance of ceramics, welding technology is required to achieve a reliable connection between ceramics and metals. [0003] Brazing is a very promising technology to realize the connection of ceramics and metals. However, there are two main problems in the process of brazing connection—interfacial wetting and joint residual stress. For the problem of interfacial wetting and bonding, the ceramic side is particularly prominent in the joint between ceramics and metals. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/06B23K1/20B23K35/28
Inventor 陈晓光冷雪松闫久春高飞魏晶慧王谦
Owner HARBIN INST OF TECH
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