Connection method of Si3N4 ceramics and titanium alloy

A connection method and technology of titanium alloy, applied in the field of welding, can solve the problems of low joint strength, low connection strength, unable to meet the practical application of engineering, etc., and achieve the effect of high connection strength, good wetting performance, and repeatable performance.

Inactive Publication Date: 2012-08-15
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies by Xiong Baiqing and Chu Jianxin in China have shown that adding an intermediate layer can effectively control the influence of residual thermal stress on the performance of Si3N4 / metal brazed joints; Zhai Yang, Ren Jialie, etc. use amorphous alloys as the intermediate layer to diffusely connect Si3N4 and 40Cr steel, but the connection The strength is not high; He Peng, Feng Jicai, etc. studied the distribution characteristics of the residual stress and the role of the intermediate layer in the Si3N4 ceramic and stainless steel diffusion connection joints, but the joint strength is low
The above connection between Si3N4 and metal can effectively reduce the residual stress of the joint, but all of them have low joint strength and cannot meet the requirements of practical engineering applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Select industrial-grade brazing material amorphous Ti40Zr25Cu20Ni15 brazing filler metal with a thickness of 30 μm; the pure metal intermediate layer uses an industrial-grade product with a purity of Ni foil of 99.8% or more and a thickness of 100 μm. The connection steps are as follows:

[0021] 1. Preparatory stage: First, the end faces of the Si3N4 ceramics and titanium alloy samples to be connected are ground flat with diamond abrasive paste, and then the amorphous Ti40Zr25Cu20Ni15 solder and Ni foil are polished with No. 5 metallographic sandpaper, and then placed together in acetone Perform ultrasonic cleaning for 10 minutes;

[0022] 2. Assembly steps: The polished amorphous Ti40Zr25Cu20Ni15 solder, Ni foil, ground Si3N4 ceramics and titanium alloy are installed in the special fixture in the order of Si3N4 ceramics, amorphous Ti40Zr25Cu20Ni15 solder, Ni, and titanium alloy. Medium; at the same time, place a small weight on the parts to be connected to generate a...

Embodiment 2

[0027] Select industrial-grade brazing material amorphous Ti40Zr25Cu20Ni15 brazing filler metal, industrial-grade products with a thickness of 45 μm; the pure metal intermediate layer uses Ni foil with a purity of more than 99.8% and an industrial-grade product with a thickness of 250 μm. The connection steps are as follows:

[0028] 1. Preparatory stage: First, the end faces of the Si3N4 ceramics and titanium alloy samples to be connected are ground flat with diamond abrasive paste, and then the amorphous Ti40Zr25Cu20Ni15 solder and Ni foil are polished with No. 5 metallographic sandpaper, and then placed together in acetone Perform ultrasonic cleaning for 10 minutes;

[0029] 2. Assembly steps: The polished amorphous Ti40Zr25Cu20Ni15 solder, Ni foil, ground Si3N4 ceramics and titanium alloy are installed in the special fixture in the order of Si3N4 ceramics, amorphous Ti40Zr25Cu20Ni15 solder, Ni, and titanium alloy. Medium; at the same time, place a small weight on the part...

Embodiment 3

[0034] Industrial-grade solder amorphous Ti40Zr25Cu20Ni15 solder with a thickness of 45 μm is selected; the pure metal intermediate layer is an industrial-grade product with a purity of Ni foil of more than 99.8% and a thickness of 180 μm. The connection steps are as follows:

[0035] 1. Preparatory stage: First, the end faces of the Si3N4 ceramics and titanium alloy samples to be connected are ground flat with diamond abrasive paste, and then the amorphous Ti40Zr25Cu20Ni15 solder and Ni foil are polished with No. 5 metallographic sandpaper, and then placed together in acetone Perform ultrasonic cleaning for 10 minutes;

[0036] 2. Assembly steps: The polished amorphous Ti40Zr25Cu20Ni15 solder, Ni foil, ground Si3N4 ceramics and titanium alloys are installed in the order of Si3N4 ceramics, amorphous Ti40Zr25Cu20Ni15 solder, Ni, and titanium alloys. In the special fixture; at the same time, place a small weight on the parts to be connected to generate a pressure of 0.04MPa;

...

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Abstract

The invention belongs to the technical field of welding, and relates to connection of a dissimilar material, in particular to a connection method of Si3N4 ceramics and titanium alloy. The method comprises the step of: connecting an industrial-grade solder and a pure metal intermediate layer in vacuum, wherein the industrial-grade solder is an amorphous Ti40Zr25Cu20Ni15 solder with the thickness of 30-45 mu m, and the pure metal intermediate layer is Ni foil with the thickness of 100-250 mu m. According to the invention, the residual stress of the joint between the ceramics and the titanium alloy can be reduced and the strength of the joint is improved.

Description

technical field [0001] The invention belongs to the field of welding technology and relates to the connection of dissimilar materials. 3 N 4 The joining method of ceramic and titanium alloy. Background technique [0002] Structural ceramic materials have unique properties such as high strength, high temperature resistance, and corrosion resistance, but their shortcomings such as high brittleness, scattered strength, and difficult processing limit their application as an integral mechanism in engineering. Realizing the connection between structural ceramics and metals is of great significance to expand the application fields of ceramics. [0003] The connection between ceramics and metals is mainly active brazing and diffusion welding, in addition to some new methods such as instantaneous liquid phase connection and secondary PTLP. Due to the large difference in the physical and chemical properties of ceramics and metals, especially the large difference in thermal expansio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02
Inventor 邹家生许祥平严铿高飞刘欢冯俊
Owner JIANGSU UNIV OF SCI & TECH
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