Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of silicon nitride ceramic/stainless steel brazed joint with corrosion resistance and stress relief

A technology of silicon nitride ceramics and brazing joints, applied in welding equipment, welding/welding/cutting articles, manufacturing tools, etc., can solve the problem of large expansion coefficient of metal base material, poor corrosion resistance of brazing material, and cracking of silicon nitride ceramics And other issues

Active Publication Date: 2021-06-25
HARBIN INST OF TECH
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem that the existing silicon nitride ceramics and metal active metals are brazed due to the excessive expansion coefficient of the brazing filler metal and the metal base material itself, which causes the silicon nitride ceramics to crack due to large residual stress, and the brazing In view of the technical problem that the material itself is not corrosion-resistant, a method for preparing a silicon nitride ceramic / stainless steel brazing joint with corrosion resistance and stress relief is provided

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of silicon nitride ceramic/stainless steel brazed joint with corrosion resistance and stress relief
  • Preparation method of silicon nitride ceramic/stainless steel brazed joint with corrosion resistance and stress relief
  • Preparation method of silicon nitride ceramic/stainless steel brazed joint with corrosion resistance and stress relief

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0020] Embodiment 1: This embodiment is a method for preparing a silicon nitride ceramic / stainless steel brazed joint with corrosion resistance and stress relief. The specific process is as follows:

[0021] 1. The base material Si 3 N 4 The surface of the ceramic to be welded is polished to smooth with 300# metallographic sandpaper, 600# metallographic sandpaper and 1000# metallographic sandpaper in turn, ultrasonically oscillated in acetone for 3min to 5min, and then placed in an oven for drying;

[0022] 2. Grind the base material 316L stainless steel with 600#SiC sandpaper and #1000SiC sandpaper in turn to remove the surface oxide layer, then polish it with 800# metallographic sandpaper and 1000# metallographic sandpaper in turn until bright, and then clean it with ultrasonic vibration in acetone for 3min ~5min, and finally put the material into the oven to dry;

[0023] Repeat the above operations in step 2 for the X metal foil, Ag foil, solder AgCuTi and solder AgCu re...

specific Embodiment approach 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the ultrasonic vibration described in step 1 is performed in an ultrasonic oscillator. Others are the same as the first embodiment.

specific Embodiment approach 3

[0029] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the frequency of the ultrasonic vibration described in step 1 is 40KHz. Others are the same as those in Embodiment 1 or 2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a silicon nitride ceramic / stainless steel brazed joint with corrosion resistance and stress relief, and relates to a preparation method of a silicon nitride ceramic / stainless steel brazed joint. The invention aims to solve the technical problems that silicon nitride ceramic cracks due to bearing of large residual stress and brazing filler metal is not corrosion-resistant due to overlarge expansion coefficients of the brazing filler metal and base metal when existing silicon nitride ceramic and active metal are brazed. A composite brazing filler metal layer suitable for connecting the silicon nitride ceramic and 316L stainless steel is developed on the basis of brazing filler metal AgCuTi and AgCu, the brazing filler metal AgCuTi and Ag foil are mutually dissolved, the brazing filler metal AgCu and Ag foil are mutually dissolved, then Ag-based solid solutions are formed on two sides of Mo, thus the residual stress of the connector can be reduced, the overall corrosion resistance of the connector can be improved, no large holes exist in the whole welding seam area after corrosion, and the whole joint shows relatively good corrosion resistance.

Description

technical field [0001] The invention relates to a method for preparing a silicon nitride ceramic / stainless steel brazing joint. Background technique [0002] Silicon nitride ceramics (Si 3 N 4 ) is a high-temperature ceramic with high strength, high hardness, wear resistance, oxidation resistance and self-lubrication, and has become the most promising candidate material that can be widely used in high-tech fields, and Si 3 N 4 It has excellent corrosion resistance, such as acid resistance, molten salt corrosion, etc., so it can serve in relatively harsh corrosive environments. But since Si 3 N 4 Ceramic itself is brittle, which limits its development, while metal materials have excellent room temperature strength and ductility. If the two materials can be combined to produce complex components that meet the requirements, it will make Si 3 N 4 A major breakthrough has been made in the application of ceramics, and scholars at home and abroad have conducted extensive res...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/00B23K1/008B23K1/20
CPCB23K1/0008B23K1/008B23K1/20B23K2103/05B23K2103/52
Inventor 张杰郭松松孙良博刘春凤方健
Owner HARBIN INST OF TECH