Solder containing rare earth, tin and zinc, and preparation method thereof

A tin-zinc and rare-earth technology, applied in the field of rare-earth-containing tin-zinc solder and its preparation, can solve the problems of high silver price, high cost, easy to open welding and the like, and achieve the effect of dense alloy structure

Inactive Publication Date: 2005-07-06
戴国水
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Problems solved by technology

[0003] Existing lead-free solders are representative, such as Sn35Ag in tin-silver series alloys, which is a tin-silver eutectic alloy with a low melting temperature (221°C), but silver is expensive and has a slightly higher melting point. In order to reduce For its melting temperature, the usual method is to add a large amount of bismuth (Bi) and / or indium (In), but the addition of bismuth makes the alloy hard and brittle, which not only makes processing difficult, but also makes the brazing joint unable to withstand impact, Easy to open soldering; and the addition of indium is unacceptably high due to the limited reserves of indium and the high price

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  • Solder containing rare earth, tin and zinc, and preparation method thereof

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Embodiment Construction

[0016] Take the configuration of 500kg rare earth-containing Sn-9Zn solder as an example:

[0017] Melt 454.75kg of tin ingots first, then add 40.25kg of zinc ingots, keep the temperature at 380°C and start stirring after the zinc ingots are melted, add 5kg of zinc-based master alloy containing 5% mixed rare earth metals after 2 hours, stir and wait for it to melt Then continue to stir for half an hour, and then start the subsequent casting, extrusion, and wire drawing processes, and draw the rare earth-containing tin-zinc solder with the required finished product diameter.

[0018] According to the above-mentioned embodiment, the composition of each component in the rare earth-containing tin-zinc solder is as follows: zinc (Zn) 9%, a mixture mainly composed of light rare earth elements such as lanthanum (La) and cerium (Ce) Rare earth metal (RE) 0.05%, the rest is tin (Sn) and impurities with a total amount not greater than 0.12%. The composition of each component in the imp...

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Abstract

This invention relates to solder with rare earth tin and zinc and its process materials in electron parts welding technique, which comprises the components as weight percentages as following: zinc for 8í½10 úÑ; mixture rare earth metal with light metal of lanthanum and cerium for 0.01í½0.12 úÑ; the rest are tin and impurity less than 0.12 %. ú¼ The process method comprises the following steps; melting tin and adding zinc ingot; then adding the zinc base middle alloy with rare earth metals after zinc is melt; keeping blending with temperature increasing and drilling into round section pressed stock; then pressing it into thick line stock and into solder with rare earth tin zinc after several drawing.

Description

technical field [0001] The invention relates to a rare earth-containing tin-zinc solder and a preparation method thereof, belonging to the technical field of preparation of tin-zinc alloys for welding electronic components. Background technique [0002] Pb-tin alloy is a kind of soldering material that has been widely used. However, due to the great toxicity of lead to humans, it has attracted great attention in the world and the trend of lead-free has arisen. The existing requirements for lead-free solder mainly include: 1. The lead content is less than 0.1%; 2. The closer the melting point is to the lead-tin eutectic alloy, the better; 3. Good electrical and thermal conductivity; 4. It has certain strength and ductility. Good machinability; 5. The supply of raw materials is sufficient and the price is low; 6. The ingredients should not be too complicated to facilitate recycling. [0003] Existing lead-free solders are representative, such as Sn35Ag in t...

Claims

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Application Information

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IPC IPC(8): B23K35/26B23K35/40
Inventor 戴国水金成焕
Owner 戴国水
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