Combination material of fluorine-free flux and cadmium-free silver solder for copper-brass brazing

A technology of combining materials and silver solder, applied in welding/cutting medium/material, welding medium, welding equipment, etc., can solve the problems of difficult cleaning and strong corrosion, and achieve good wettability, good plasticity and comprehensive The effect of mechanical properties

Inactive Publication Date: 2009-09-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brazing flux currently used, whether it is matched with copper-based brazing filler metal or silver-based brazing filler metal, all use FB102 / QJ102, FB112 / QJ112 and other fluxes, which contain a large amount of KF and KBF 4 、KHF 2 , CaF 2 Fluoride, etc., the post-welding residue produced by the above-mentioned fluoride is very corrosive, and it is difficult to clean it completely

Method used

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Effect test

specific Embodiment approach 1

[0011] Proportioning by mass percentage, its composition is: 2.0% boric acid (H 3 BO 3 ), 28.0% boric anhydride (B 2 o 3 ), 15.0% carbonate (K 2 CO 3 or Na 2 CO 3 ), 0.1% nitrate (KNO 3 or NaNO 3 ), the rest are borates (K 2 B 4 o 7 or Na 2 B 4 o 7 ).

specific Embodiment approach 2

[0012] Proportioning by mass percentage, its composition is: 8.0% boric acid (H 3 BO 3 ), 38.O% boron anhydride (B 2 o 3 ), 5.0% carbonate (K 2 CO 3 or Na 2 CO 3 ), 1.0% nitrate (KNO 3 or NaNO 3 ), the rest are borates (K 2 B 4 o 7 or Na 2 B 4 o 7 ).

specific Embodiment approach 3

[0013] Proportioning by mass percentage, its composition is: 5.0% boric acid (H 3 BO 3 ), 33.0% boric anhydride (B 2 o 3 ), 10% carbonate (K 2 CO 3 or Na 2 CO 3 ), 0.3% nitrate (KNO 3 or NaNO 3 ), the rest are borates (K2B4O7 or Na 2 B 4 o 7 ).

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Abstract

The invention relates to a composite material of fluorine-free brazing flux and cadmium-free silver brazing filler metal for copper-brass brazing, belonging to brazing materials. This brazing material is a combination of fluorine-free flux and cadmium-free silver solder, wherein the fluorine-free flux includes 2% to 8% boric acid (H3BO3), 28% to 38% boric anhydride (B2O3), 5% to 15% % carbonate (K2CO3 or Na2CO3), 0.1% to 1.0% nitrate (KNO3 or NaNO3), the rest is borate (K2B4O7 or Na2B4O7); cadmium-free silver solder includes 15% to 45% silver (Ag) , 3% to 10% of phosphorus (P), 0.001% to 0.030% of zirconium (Zr), 0.001% to 0.010% of cerium (Ce), and the rest is copper (Cu). The composite material has good wettability when brazing copper-copper, brass-brass, and copper-brass, and the brazing joint has good plasticity and comprehensive mechanical properties, and there is no residual fluorine ion at all. It is especially suitable for brazing copper materials that are used in harsh environments (high humidity, high temperature, high salt spray, etc.).

Description

1. Technical field [0001] The invention relates to a combination of fluorine-free brazing flux and cadmium-free silver brazing material suitable for copper-brass brazing. Brazing materials in the field of materials and metallurgy. 2. Background technology [0002] Copper (typical materials such as T 2 ) and brass (typical materials such as H62), whether copper-based solder or silver-based solder is used, flux is required to ensure that the oxide film on the brazing part can be removed so that the liquid solder can fill the Brazing gap. The brazing flux currently used, whether it is matched with copper-based brazing filler metal or silver-based brazing filler metal, all use FB102 / QJ102, FB112 / QJ112 and other fluxes, which contain a large amount of KF and KBF 4 、KHF 2 , CaF 2 Fluoride, etc., the post-welding residue produced by the above-mentioned fluoride is very corrosive, and it is difficult to clean it completely. For many important products or products that need to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/363
Inventor 薛松柏顾文华李滨呼义通
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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