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
Effect test

Embodiment 1

[0018] Choose 3D printed stainless steel and silicon nitride ceramics for vacuum brazing of butt joints. Among them, the size of 3D printed stainless steel and silicon nitride ceramics is 20mm×20mm×5mm, and the surface to be brazed 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 60 μm, the thickness of the copper foil is 60 μm, and 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 impurities, oil stains and oxide films on the surface, and use W40~W7 metallographic sandpaper to grind the 3D printed stainless steel smoothly. Grind the solder foil and copper foil on both sides with W7 metallographic sandpaper. After grinding, put the sample to be welded, solder and copper foil together in acetone, use ultrasonic cleaning for ...

Embodiment 2

[0025] Vacuum brazing of butt joints between 3D printed stainless steel and silicon nitride ceramics. Among them, the size of 3D printed stainless steel and silicon nitride ceramics is 20mm×20mm×5mm, and the surface to be brazed 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 solder provided is 80μm, the thickness of the copper foil is 70μm, and 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 impurities, oil stains and oxide films on the surface, and use W40~W7 metallographic sandpaper to grind the 3D printed stainless steel smoothly. Grind the solder foil and copper foil with W7 metallographic sandpaper. After grinding, put the sample to be welded, solder and copper foil together in acetone, use ultrasonic cleaning for 18 minutes...

Embodiment 3

[0032] Choose 3D printed stainless steel and silicon nitride ceramics for vacuum brazing of butt joints. Among them, the size of 3D printed stainless steel and silicon nitride ceramics is 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm.

[0033] The composition and mass percentage ratio of the solder are: Cu25.0%, In18.0%, Ti8.0%, Zr10.0%, Ce0.05%, and the balance is Ag. The solder thickness provided is 150μm, and the copper foil thickness 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 impurities, oil stains and oxide films on the surface, and use W40~W7 metallographic sandpaper to grind the 3D printed stainless steel smoothly. Grind the solder foil and copper foil with W7 metallographic sandpaper. After grinding, put the sample to be welded, solder and copper foil together in acetone, use ultrasonic cleaning for 20 minutes...

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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

technical field [0001] The invention relates to a solder and a brazing method for brazing 3D printed stainless steel and silicon nitride ceramics, and belongs to the field of brazing. Background technique [0002] 3D printing is a new type of rapid prototyping manufacturing technology. It uses 3D modeling software to model the shape parts, slices the 3D model through the software, and finally controls the special 3D printer to print through the computer output control signal. Stainless steel has the characteristics of corrosion resistance, high temperature resistance and excellent mechanical properties. Due to its good powder characteristics, simple preparation process and low cost, it is very suitable for 3D printing technology. The stainless steel printed by 3D has no defects such as casting and melting, has uniform structure composition and excellent mechanical properties. Silicon nitride ceramic is an excellent high-temperature engineering material with high hardness, ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K1/008B23K1/20
CPCB23K35/3006B23K1/008B23K1/20
Inventor 许祥平何力邹家生夏春智
Owner JIANGSU UNIV OF SCI & TECH
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