Brazing filler metal for brazing 3D printing stainless steel and silicon nitride ceramic and brazing method

A technology of silicon nitride ceramics and 3D printing, which is applied in the direction of welding/cutting media/materials, welding media, welding equipment, etc., can solve the problems of large stress concentration in the welding layer and large difference in linear expansion coefficient, etc. Good corrosion resistance, good wettability and spreading effect

Inactive Publication Date: 2017-05-31
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solder can successfully complete the connection of ceramics and stainless steel, due to the large difference in the linear expansion coefficients of ceramics and stainless steel, it is easy to generate a large stress concentration in the welding layer after welding, forming defects.

Method used

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  • Brazing filler metal for brazing 3D printing stainless steel and silicon nitride ceramic and brazing method
  • Brazing filler metal for brazing 3D printing stainless steel and silicon nitride ceramic and brazing method

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0017] Example 1

[0018] Choose 3D printed stainless steel and silicon nitride ceramics for vacuum brazing of butt joints. The dimensions of the 3D printed stainless steel and silicon nitride ceramics are both 20mm×20mm×5mm, and the brazing surface is 20mm×5mm.

[0019] The composition and mass percentage ratio of the solder are: Cu20.0%, In15.0%, Ti5.0%, Zr5.0%, Ce0.01%, and the balance is Ag. The thickness of the solder is 60μm and the thickness of the copper foil is 60μm. The brazing process steps are:

[0020] (1) Preparation stage: clean the end faces of the 3D printed stainless steel and silicon nitride ceramic samples to be welded to remove surface impurities, oil stains and oxide films. Use W40~W7 metallographic sandpaper to grind and smooth the 3D printed stainless steel. W7 metallographic sandpaper grinds both sides of the solder foil and copper foil smoothly. After grinding, put the sample to be soldered, solder and copper foil together in acetone, clean it with ultrasonic

Example Embodiment

[0024] Example 2

[0025] 3D printing stainless steel and silicon nitride ceramics for vacuum brazing of butt joints. The dimensions of the 3D printed stainless steel and silicon nitride ceramics are both 20mm×20mm×5mm, and the brazing surface is 20mm×5mm.

[0026] The composition and mass percentage ratio of the solder are: Cu22.0%, In16.0%, Ti7.0%, Zr8.0%, Ce0.03%, and the balance is Ag. The thickness of the provided solder is 80μm, and the thickness of the copper foil is 70μm. The brazing process steps are:

[0027] (1) Preparation stage: clean the end faces of the 3D printed stainless steel and silicon nitride ceramic samples to be welded to remove surface impurities, oil stains and oxide films. Use W40~W7 metallographic sandpaper to grind and smooth the 3D printed stainless steel. W7 metallographic sandpaper grinds both sides of the solder foil and copper foil smoothly. After grinding, put the sample to be soldered, solder and copper foil together in acetone, clean it with ultras

Example Embodiment

[0031] Example 3

[0032] Choose 3D printed stainless steel and silicon nitride ceramics for vacuum brazing of butt joints. The dimensions of the 3D printed stainless steel and silicon nitride ceramics are both 20mm×20mm×5mm, and the brazing surface is 20mm×5mm.

[0033] The composition and mass percentage ratio of the solder is: Cu25.0%, In18.0%, Ti8.0%, Zr10.0%, Ce0.05%, and the balance is Ag. The thickness of the provided solder is 150μm, and the thickness of the copper foil is 80μm.

[0034] The brazing process steps are:

[0035] (1) Preparation stage: clean the end faces of the 3D printed stainless steel and silicon nitride ceramic samples to be welded to remove surface impurities, oil stains and oxide films. Use W40~W7 metallographic sandpaper to grind and smooth the 3D printed stainless steel. W7 metallographic sandpaper grinds both sides of the solder foil and copper foil smoothly. After grinding, put the sample to be soldered, solder and copper foil together in acetone, clean

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Abstract

The invention discloses brazing filler metal for brazing 3D printing stainless steel and silicon nitride ceramic and a brazing method. The brazing filler metal comprises, by weight, 20.0 %-25.0% of Cu, 15.0 %-18.0% of In, 5.0 %-8.0% of Ti, 5.0 %-10.0% of Zr, 0.01%-0.05% of Ce, and the balance Ag. According to the copper-based brazing filler metal provided by the invention, the brazing temperature is 750 DEG C-800 DEG C; the melting temperature of the brazing filler metal is moderate; melting of the brazing filler metal is uniform; compared with existing patents in this respect, the Zr element is added, the melting point of the brazing filler metal can be further reduced, meanwhile, the Zr and Fe are mutually diffused to form FeZr2, Fe2Zr and other solid solutions, the Zr and the Cu form a Cu-Zr phase, and the Zr and C form a ZrC compound; the silver-based structure can be refined to the greatest extent through the trace rare earth element Ce, and a grain refining strengthening effect is achieved; the solid solutions and the phase are distributed in a connecting layer and a diffusion layer, the proportion is uniform, and the structure is tight; by means of copper foil of a middle layer, the brazing filler metal has good wettability and spreadability on parent metal; and obtained brazing joints are high in strength and good in corrosion resistance.

Description

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Claims

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Application Information

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Owner JIANGSU UNIV OF SCI & TECH
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