Welding method for relieving residual stress of ceramic and metal brazed joint

A technology of metal brazing and residual stress, which is applied in the direction of welding/welding/cutting articles, welding equipment, metal processing equipment, etc., can solve the problems of poor reliability, large residual stress, and low mechanical properties, so as to reduce the coefficient of thermal expansion, The effect of large modulus of elasticity and low coefficient of thermal expansion

Active Publication Date: 2020-03-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims to solve the problem of low mechanical properties and poor reliability of ceramic / titanium-based material joints due to large residual stress to a certain extent

Method used

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  • Welding method for relieving residual stress of ceramic and metal brazed joint
  • Welding method for relieving residual stress of ceramic and metal brazed joint
  • Welding method for relieving residual stress of ceramic and metal brazed joint

Examples

Experimental program
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Effect test

Embodiment 1

[0087] This embodiment provides a welding method for alleviating the residual stress of ceramic and metal brazing joints, which specifically includes:

[0088] S1, select Al 2 o 3 For ceramics, first use 800#~2000# diamond sand discs to Al 2 o 3 The surface to be connected of the ceramics is polished, and secondly, the surface to be connected is polished with 1000#~7000# SiC water sandpaper in sequence, and then mechanically polished until the surface to be connected is a mirror surface, and the Al 2 o 3 Surface to be joined of ceramics.

[0089] Select titanium-based material Ti-6Al-4V, use 1000#~7000# water sandpaper to polish the surface to be connected of Ti-6Al-4V in sequence, and then perform mechanical polishing until the surface to be connected is a mirror surface, to obtain Ti-6Al Modified surface of -4V.

[0090] The polished ZrC-SiC ceramics and Ti-6Al-4V were ultrasonically cleaned 4 times with acetone, each time for 10 minutes, and then dried to obtain the Z...

Embodiment 2

[0099] The difference between this embodiment 2 and embodiment 1 is that this embodiment uses Al 2 o 3 Ceramics and Ti-6Al-4V are directly brazed, and no surface modification layer is set on the titanium-based material Ti-6Al-4V.

[0100] In the specific preparation process, the main difference between embodiment 2 and embodiment 1 is that embodiment 2 does not include steps S2 and step S3 described in embodiment 1, and in the brazing process of step S4, it is in direct contact with the solder Al 2 o 3 Ceramic surface to be connected and Ti-6Al-4V surface to be connected.

[0101] Comparing Example 1 and Example 2, using the brazing joint 1 obtained by the welding method described in Example 1 to relieve the residual stress of ceramic and metal brazing joints, the joint 1 has a shear strength of 242MPa. However, for the brazed joint 2 obtained by the direct brazing method described in Comparative Example 2, the measured shear strength of the brazed joint 2 is only 60 MPa. ...

Embodiment 3

[0104] This embodiment provides a welding method for alleviating the residual stress of ceramic and metal brazing joints, which specifically includes:

[0105] S1. Select ZrC-SiC ceramics. First, use 800#~2000# diamond sand discs to polish the surface to be connected of ZrC-SiC ceramics. Secondly, use 1000#~7000# SiC water sandpaper to polish the surface to be connected. Afterwards, mechanical polishing is carried out until the surface to be connected is a mirror surface, and the surface to be connected of ZrC-SiC ceramics is obtained.

[0106] Select titanium-based material Ti-6Al-4V, use 1000#~7000# water sandpaper to polish the surface to be connected of Ti-6Al-4V in sequence, and then perform mechanical polishing until the surface to be connected is a mirror surface, to obtain Ti-6Al Modified surface of -4V.

[0107] The polished ZrC-SiC ceramics and Ti-6Al-4V were ultrasonically cleaned 4 times with acetone, each time for 10 minutes, and then dried to obtain the ZrC-SiC ...

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Abstract

The invention provides a welding method for relieving residual stress of a ceramic and metal brazed joint. The method comprises the following steps: S1, respectively carrying out surface treatment ona ceramic material and a titanium-based material to obtain a to-be-connected ceramic material and a to-be-modified titanium-based material; S2, preparing a mixture for generating a surface modification layer; S3, coating the modified surface of the to-be-modified titanium-based material with the mixture, and performing connection treatment to obtain a modified titanium-based material with a surface modification layer; and S4, sequentially connecting the modified titanium-based material, a brazing filler metal and the to-be-connected ceramic material, and performing brazing. The brazing fillermetal is connected with the to-be-connected surface of the to-be-connected ceramic material and the surface modification layer. According to the method, the surface modification layer with the small thermal expansion coefficient is prepared on the surface of the titanium-based material in advance, then brazing connection is conducted, on the premise that the elasticity modulus of the brazing filler metal layer is not increased, the thermal expansion coefficient of the surface modification layer can be reduced, and the residual stress of a brazed joint is effectively reduced.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding method for alleviating the residual stress of ceramic and metal brazing joints. Background technique [0002] Ceramic / metal composite components combine the advantages of ceramic materials and metal materials, and have great application prospects; however, due to the large difference in thermal expansion coefficients between ceramic materials and titanium-based materials, ceramic materials and titanium-based materials will be separated during the connection process. Unavoidable welding residual stress. Larger stress will significantly reduce the fracture strength of the joint, causing it to initiate cracks or cracks under a small applied load; even cause the joint to fail to achieve effective connection. Therefore, how to relieve the high stress in the joint is the premise and key to realize the reliable connection of materials with significant thermal expansion misma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/19B23K1/20B23K1/008
CPCB23K1/008B23K1/19B23K1/20B23K2103/14B23K2103/52
Inventor 何鹏林盼盼冯青华林铁松张秋光
Owner HARBIN INST OF TECH
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