Solder for brazing red copper and graphite and brazing method

A technology of solder and graphite, which is applied in the direction of welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of limited practical application and complicated process, and achieve good corrosion resistance, excellent high temperature performance, and brazing Simple and reasonable process

Inactive Publication Date: 2017-02-15
JIANGSU YANGMING SHIP EQUIP MFG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method adds a process, the process is complicated, and the actual application is not wide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Choose copper and graphite for vacuum brazing of butt joints. Among them, the size of copper and graphite samples is 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm.

[0022] The composition and mass percentage ratio of the solder are: Ag20%, Cu10%, Ti10%, and the balance is Al. The thickness of the solder is 0.1 mm.

[0023] The brazing process steps are:

[0024] (1) Preparation stage: Clean the end faces of the red copper and graphite samples to be welded, remove impurities, oil stains and oxide films on the surface, use W40~W7 metallographic sandpaper to grind and smooth, use W7 metallographic sandpaper After grinding, put the sample to be welded and the solder foil together in acetone, ultrasonically clean it for 15 minutes, and dry it;

[0025] (2) Assembling stage: place the cleaned solder foil between the surface of copper and graphite to be welded, put the copper, graphite and solder in the order of copper on top, graphite on the bottom, and solder i...

Embodiment 2

[0029] Choose copper and graphite for vacuum brazing of butt joints. Among them, the size of copper and graphite samples is 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm.

[0030] The composition and mass percentage ratio of the solder are: Ag22%, Cu12%, Ti12%, and the balance is Al. The thickness of the solder is 0.3 mm.

[0031] The brazing process steps are:

[0032] (1) Preparation stage: Clean the end faces of the red copper and graphite samples to be welded, remove impurities, oil stains and oxide films on the surface, use W40~W7 metallographic sandpaper to grind and smooth, use W7 metallographic sandpaper After grinding, put the sample to be welded and the solder foil together in acetone, ultrasonically clean it for 15 minutes, and dry it;

[0033] (2) Assembling stage: place the cleaned solder foil between the surface of copper and graphite to be welded, put the copper, graphite and solder in the order of copper on top, graphite on the bottom, and solder i...

Embodiment 3

[0037] Choose copper and graphite for vacuum brazing of butt joints. Among them, the size of copper and graphite samples is 20mm×20mm×5mm, and the surface to be brazed is 20mm×5mm.

[0038] The composition and mass percentage ratio of the solder are: Ag25%, Cu15%, Ti15%, and the balance is Al. The thickness of the solder is 0.5mm.

[0039] The brazing process steps are:

[0040] (1) Preparation stage: Clean the end faces of the red copper and graphite samples to be welded, remove impurities, oil stains and oxide films on the surface, use W40~W7 metallographic sandpaper to grind and smooth, use W7 metallographic sandpaper After grinding, put the sample to be welded and the solder foil together in acetone, ultrasonically clean it for 15 minutes, and dry it;

[0041] (2) Assembling stage: place the cleaned solder foil between the surface of copper and graphite to be welded, put the copper, graphite and solder in the order of copper on top, graphite on the bottom, and solder in t...

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Abstract

The invention discloses solder for brazing red copper and graphite and a brazing method. The solder comprises the following elemental compositions in percent by weight: 20-25 percent of Ag, 10-15 percent of Cu, 10-15 percent of Ti and the balance of Al. The brazing temperature of the Al-based Ag-Cu-Ti lead-free solder is 950-1,030 DEG C, and the melting temperature of the solder is moderate; through addition of related beneficial elements, graphite is wetted and spread well by the solder; an obtained brazed joint is high in strength and high in corrosion resistance, can be completely applied in a complex environment, and is economic solder with high comprehensive performance; the brazing process is simple and reasonable; by adoption of a vacuum furnace brazing method, brazing flux is not required and other protection measures are not taken during the brazing process; and a high vacuum environment cooperates with setting of reasonable technological parameters, so that the whole component is free from deformation, micro cracks, air holes and impurities, and the brazed joint with high mechanical property is beneficial for being obtained.

Description

technical field [0001] The invention relates to a brazing filler metal for red copper and graphite and a brazing method, belonging to the field of brazing. Background technique [0002] Graphite has a high melting point, low density, low coefficient of thermal expansion, and high thermal shock resistance. Graphite also has good electrical conductivity and excellent corrosion resistance. Graphite is a high-temperature-resistant material with high specific strength. However, the low mechanical strength of graphite itself limits its application, and often requires a composite material composed of a metal matrix to achieve complementary performance. Copper has excellent electrical conductivity, plasticity, ductility and corrosion resistance. The reliable connection of copper and graphite can expand the application of both materials, in these applications, brazing plays a very important role. [0003] The brazing of graphite and metal mainly has the following difficulties: (1)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/28B23K1/20B23K1/008
CPCB23K35/286B23K1/008B23K1/20B23K1/206
Inventor 邹家生黄晓龙许祥平严铿叶有利施志强高飞
Owner JIANGSU YANGMING SHIP EQUIP MFG TECH
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