High-ductility environment friendly silver-saving medium-temperature brazing filler metal
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A technology of high plasticity and brazing filler metal, applied in welding/cutting media/materials, welding media, manufacturing tools, etc., can solve problems such as harm to human body, low brittleness of brazing filler metal alloy, low melting temperature, etc.
Active Publication Date: 2009-01-14
浙江信和科技股份有限公司
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Problems solved by technology
[0005] The purpose of the present invention is to provide a low-cost solder alloy for the shortcomings of the existing cadmium-containing lead-containing silver solder that has serious environmental pollution, cadmium and lead will cause harm to the human body, high brittleness of the solder alloy, and high cost. , Solder alloy with low brittleness, low melting temperature and narrow melting range, high plasticity, environmental protection and silver medium temperature solder without cadmium and lead
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Embodiment 1
[0021] The raw material of a kind of high-plasticity environment-friendly section silver mid-temperature solder adopts Cu (copper), Sn (tin), P (phosphorus), Ni (nickel), Li (lithium) and La (lanthanum), and its proportioning (by weight percentage Calculated) is: Cu 86.09%, Sn 7.4%, P 5.4%, Ni 0.95%, Li 0.04%, La 0.12%, melting temperature 628 ~ 674 ℃, elongation δ ≥ 13.0% when Φ2.0 wire stretched, with There is obvious uniform necking, the rings are Φ1.0mm×D12.8mm, Φ0.9mm×D23.5mm.
Embodiment 2
[0023] The raw materials of a kind of high-plasticity environment-friendly silver middle-temperature solder adopt Cu (copper), Sn (tin), P (phosphorus), Ni (nickel), Ag (silver), Li (lithium) and La (lanthanum), and its compounding The ratio (by weight percentage) is: Cu 83.64%, Sn 7.3%, P 5.7%, Ni 1.2%, Ag 1.3%, Li 0.06%, La 0.8%, melting temperature 621~677℃, Φ2.0 wire drawing When the elongation rate δ ≥ 10.0%, accompanied by obvious uniform necking, ring Φ1.0mm × D12.8mm, Φ0.9mm × D23.5mm.
Embodiment 3
[0025] The raw materials of a kind of high-plasticity environment-friendly silver middle-temperature solder adopt Cu (copper), Sn (tin), P (phosphorus), Ni (nickel), Ag (silver), Li (lithium) and La (lanthanum), and its compounding The ratio (by weight percentage) is: Cu 83.87%, Sn 7.5%, P 5.6%, Ni 1.48%, Ag 1.4%, Li 0.05%, La 0.1%. The melting temperature is 626-672°C, the elongation δ=21.5% when the Φ2.0 wire is stretched, accompanied by obvious uniform necking, and the rings are Φ1.0mm×D12.8mm, Φ0.9mm×D23.5mm.
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Abstract
The invention relates to a high plasticity environment protection silver-saving intermediate temperature solder in which an intermediate temperature solder is used to replace the silver copper zinc cadmium solder with high content of silver, and a processing technology thereof. Aiming at the defects of the prior silver solder which contains cadmium and lead such as the heavy pollution to environment, the hazard of the cadmium and lead to human body, large brittleness of solder alloy and high cost and so on, the purpose of the invention is to provide a cadmium-free and lead-free high plasticity environment protection silver-saving intermediate temperature solder with low cost, small brittleness of solder alloy, comparatively low melting temperature and comparatively small melting range. The high plasticity environment protection silver-saving intermediate temperature solder of the invention comprises Cu, Sn, P, Ni, Ag, Li and La; wherein, Li and Na are active microelements. The preparation steps of the high plasticity environment protection silver-saving intermediate temperature solder of the invention are that raw materials are weighted by formula; the solder alloy is refined into solder ingot castings which are made into filamentous solders by hot-pressing. The filamentous solder can be made into sizes of solder coiling wire, solder straight wire and solder welding ring.
Description
technical field [0001] The invention relates to the technical field of brazing filler metal, in particular to a high-plastic, environment-friendly, silver-saving medium-temperature brazing filler metal used for medium-temperature brazing instead of high-silver-containing silver-copper-zinc-cadmium filler metal and a processing technology of the brazing filler metal. Background technique [0002] The application of silver-based solder in the manufacture of various electromechanical and electrical products has a history of 80 to 90 years. Especially in the past 30 years, the demand for household appliances represented by air conditioners and refrigerators has continued to rise. The popularization of brazing technology and Applications play a very important role. According to incomplete statistics, the domestic appliance manufacturing industry consumes up to 300 tons of silver solder per year, and the electromechanical and tool manufacturing industry consumes about 350 tons of ...
Claims
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