Novel active copper-phosphorus brazing alloy

Abstract

The invention relates to a novel active copper-phosphorus brazing alloy, belonging to a medium-temperature brazing material. Currently, no copper-phosphorus brazing alloy with reasonable formulation design, low price and high performance-price ratio is presented. The novel active copper-phosphorus brazing alloy comprises the following components by weight percent: 1-3.5% of Ag, 6.0-7.5% of P, 0.5-2.5% of Sn, 0.1-1.5% of Ni, 0.1-2.0% of Sb, 0.01-0.5% of Zr and balance of Cu. The novel active copper-phosphorus brazing alloy has the advantages of reasonable formulation design, low price, high performance-price ratio, low melting temperature and good wettability, flowability and plasticity, can be processed to be a welding wire with the minimum diameter of 0.5mm, a welding ring with the minimum inner diameter of 3.0mm and a thin strip with the minimum thickness of 0.1mm and can be widely used for resistance brazing, flame brazing and high-frequency induction brazing in industries of refrigeration, machinery, electromechanics, electrical appliances and valve fittings.

Description

technical field [0001] The invention relates to a brazing filler metal, in particular to a novel active copper-phosphorus brazing filler metal, which is suitable for brazing copper and copper alloys, copper and carbon steel, copper and nickel-plated and galvanized Bondi tubes, and can be widely used in Resistance brazing, flame brazing and high-frequency induction brazing in refrigeration, machinery, electromechanical, electrical appliances, valve fittings and other industries are medium temperature brazing materials. Background technique [0002] In recent years, with the improvement of living standards, the demand for electrical appliances represented by air conditioners, refrigerators, and home appliances has gradually increased, and the demand for brazing materials for valve fittings and compressor pipelines has also increased. BCu80PAg with a silver content of 15%, BCu75PAg with a silver content of 20%, and other copper-phosphorus solders are widely used in the welding ...

AI Technical Summary

Problems solved by technology

However, the market consumption is relatively large, and copper-phosphorus solder and silver solder with better performance need to consume more precious metal silver. With the increasing price of precious metal silver, refrigeration, machinery, electromechanical, electrical appliances, instruments, valves The production cost of brazing manufacturers in pipe fittings and other industries has been greatly increased, which not only increases the manufacturing cost of products, but also leads to a sharp increase in silver consumption, making it difficult for resources to be rationally utilized

[0003] At present, there are also some copper-phosphorus solders with less silver content, such as BCu89PAg copper-phosphorus solder containing 5% silver, BCu91PAg copper-phosphorus solder containing 2% silver, etc. Although these copper-phosphorus solders are relatively low in price, their melting temperature Higher, the brazing process performance and the mechanical strength of the brazing joint are not up to the use requirements, and the brazing performance in the welding of copper and copper alloys, copper and Bondi tubes is not as good as BCu80PAg, BCu75PAg copper-phosphorus solder and BAg30CuZnSn silver brazing material, therefore unable to meet customer requirements

[0004] Of course, there are also some brazing filler metals with relatively good performance. For example, the Chinese patent whose publication date is July 25, 2007 and whose publication number is CN101003109 discloses a kind of active medium-temperature copper-based brazing filler metal and its preparation method. Although the content of Ag is less, its plasticity is poor, and it is difficult to process into a welding wire with a minimum diameter of 0.5mm, which brings some inconvenience to use, and the brazing filler metal is copper-based brazing filler metal, which is difficult to replace copper-phosphorus brazing filler metal

Another example is that the publication date is May 24, 2006, and the publication number is CN1775978 in the Chinese patent, which discloses a multi-element alloy copper-based solder. Although the Ag content in this solder is also less, it is also a copper alloy. base solder, and the wettability of the solder is poor, and the wetting angle is about 9°

[0005] In summary, there is no copper with reasonable formula design, low price, high cost performance, low melting temperature, good wettability, fluidity and plasticity Phosphorus solder

The melting temperature of the existing high-silver copper-phosphorus solder is too high, the temperature range between the solidus line and the liquidus line is too large, the silver content is too high, the production and use costs are high, and the plasticity is poor, so it is difficult to process it into a solder with a minimum diameter of 0.5mm. Welding wire, welding rings with a minimum inner diameter of 3.0mm and thin strips with a minimum thickness of 0.1mm cannot be used in the brazing of copper and carbon steel, copper and nickel-plated and galvanized Bondi tubes, and the applicable surface is narrow, which hinders development in the field of brazing

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