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A Characterization Method for Residual Stress of Ceramic/Metal Heterogeneous Brazed Joints

A technology of brazing joints and residual stress, applied in the direction of force/torque/work measuring instruments, instruments, measuring devices, etc., to achieve strong applicability, high measurement accuracy, and simple and easy methods

Active Publication Date: 2021-04-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of how to accurately characterize the residual stress of ceramic / metal heterogeneous brazing joints to a certain extent

Method used

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  • A Characterization Method for Residual Stress of Ceramic/Metal Heterogeneous Brazed Joints
  • A Characterization Method for Residual Stress of Ceramic/Metal Heterogeneous Brazed Joints
  • A Characterization Method for Residual Stress of Ceramic/Metal Heterogeneous Brazed Joints

Examples

Experimental program
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Embodiment 1

[0079] This embodiment provides a method for characterizing the residual stress of ceramic / metal heterogeneous brazing joints, which specifically includes:

[0080] S1. The ceramic base material is alumina Al2O3 (6×5×2mm), the metal base material is titanium alloy Ti-6Al-4V (6×5×2mm), and the brazing filler metal is 100 μm thick Ag-28Cu (wt.%) Foil, no interlayer in the weld. The 6×5mm plane of Al2O3 and Ti-6Al-4V is the connection surface, and the four sides of the connection surface are aligned after purification treatment. The Ag-28Cu (wt.%) foil is directly placed on the connection surface of Al2O3 and Ti-6Al-4V directly to form a sandwich structure as the brazed joint to be characterized. At the same time, determine the brazing process parameters: brazing connection temperature, connection time, temperature and time of each heat preservation section, heating rate and cooling rate of each stage, and applied pressure.

[0081] S2. Cutting and obtaining two pieces of Al2O3...

Embodiment 2

[0089] The difference between this embodiment and Embodiment 1 is that in the method for characterizing the residual stress of a ceramic / metal heterogeneous brazing joint provided by this embodiment, the ceramic base material is zirconium carbide (ZrC). The remaining characterization steps and experimental parameters are the same as in Example 1.

[0090] A simple characterization method for the residual stress of a ceramic / metal heterogeneous brazed joint in Example 2, the joint of the obtained test piece, the measured bending angle of the stress characterization sheet is symmetrical up and down, and the bending angle α is 19 ° (in the accompanying drawing not shown).

[0091] It can be seen from Example 1 and Example 2 that under the same conditions of brazing process parameters, the bending angle of the stress characterization sheet in Example 2 is greater than the bending angle of the stress characterization sheet in Example 1, that is, the bending angle of the stress char...

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Abstract

The invention provides a characterization method for residual stress of a ceramic / metal heterogeneous brazed joint. The characterization method comprises the following steps: S1, collecting connectionparameters of a brazed joint to be characterized; S2, selecting ceramic eta which is homogeneous with the ceramic parent material of the brazed joint to be characterized, cutting and polishing to obtain ceramic eta to be diffused and connected; S3, assembling the ceramic eta to be diffused and connected and a metal sheet to form an assembly to be diffused and connected; S4, cutting the assembly to be diffused and connected to form a stress characterization sheet, replacing the ceramic parent material with the stress characterization sheet, and performing brazing connection according to the connection parameters in the step S1 to obtain an imitation connection assembly; and S5, cutting the simulation connecting assembly to obtain a test piece, and testing the bending degree of the stress characterization sheet contained on the test piece. According to the method, the test piece which is completely the same as the brazed heterogeneous joint to be characterized in process condition and welding seam microstructure is prepared, the residual stress is characterized by utilizing the bending degree of the stress characterization sheet, and the characterization method is simple and easy toimplement and the measurement accuracy is high.

Description

technical field [0001] The invention relates to the field of measuring material processing and testing, in particular to a method for characterizing the residual stress of ceramic / metal heterogeneous brazing joints. Background technique [0002] Ceramics have good mechanical properties and stable chemical properties, and can be used in some extremely harsh physical and chemical environments. However, due to the high brittleness and poor machinability of ceramics, they generally need to be connected with metals to form ceramic / metal composite components that combine the advantages of both ceramics and metals. However, since the thermal expansion coefficient of ceramics is much smaller than that of metals, during welding, due to the uneven heating of materials, large residual stresses will be generated in the welded structure, resulting in the redistribution of stress and strain in the joint area when the welded structure is loaded, affecting the size and shape of the parts. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00
CPCG01L5/0047
Inventor 林盼盼何鹏冯青华林铁松张秋光
Owner HARBIN INST OF TECH
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