Low-silver solder containing in, li, zr and la and its preparation method and use

Abstract

The invention relates to the metal material and metallurgy field, in particular to low silver brazing and soldering alloy with In, Li, Zr and La and a preparation method and application thereof. The low silver brazing and soldering alloy with In, Li, Zr and La belongs to a medium-temperature soldering and brazing material and comprises, by weight, 3%-5% of Ag, 6%-8% of P, 0.05%-2.5% of In, 0.05%-2.5% of Li, 0.005%-0.1% of Zr, 0.005%-0.1% of La, and the balance Cu. Silver ingot, phosphori, electrolytic copper, metal In, metal Li, metal Zr and rare earth La, which are sold in the market, are used, matching is carried out according to the design composition, conventional intermediate-frequency smelting and pouring are adopted, a wire can be obtained through squeezing and drawing, and a flux-cored colder wire can be obtained by adding brazing flux. The brazing and soldering alloy has the characteristics of low silver content, a low melting point, good wettability and high strength, and can replace BCu75PAg with 20% of silver and BAg25CuZnSn brazing and soldering alloy with 25% of silver, and the BCu75PAg with 20% of silver and the BAg25CuZnSn brazing and soldering alloy with 25% of silver are widely used in the refrigeration industry.

Description

technical field [0001] The invention relates to the field of metal materials and metallurgy, in particular to a low-silver solder containing In, Li, Zr and La, a preparation method and application thereof. Background technique [0002] With the strict restrictions on the use of solder containing harmful element cadmium in industry at home and abroad, especially in the home appliance industry, silver solder with higher silver content has been widely used as an alternative in the industry. With the improvement of living standards, the demand for refrigeration appliances represented by air conditioners and refrigerators is increasing, and the demand for silver brazing materials used in compressors and refrigeration pipelines is also increasing. At present, brazing of dissimilar materials such as copper and copper alloys, copper and Bondi tubes in refrigeration and other industries generally use solders with relatively high silver content, such as: BCu75PAg with 20% silver and B...

AI Technical Summary

Problems solved by technology

However, the amount of silver accounts for one-third. Silver is a precious metal and an important strategic metal of the country. The use of a large amount of high-silver solder not only increases the production cost of industrial products, but also leads to a sharp increase in silver consumption. Resources are inevitably wasted and cannot be used rationally. Therefore, research and development of a phosphorus copper solder with low content, low melting point and good wettability, which can widely replace high-silver solder, has important practical industrial application significance