What are the differences between silver-containing solder paste and lead-free copper-containing solder paste?

The metal components of lead-free solder paste include: tin, silver, copper, bismuth and other metals. Then, the one containing silverLead-free solder pasteWhat are the similarities and differences with lead-free solder paste containing copper? The common points of silver-containing solder paste and copper-containing solder paste: Both are lead-free solder paste series products and have passed the European UnionROHSCertified, it has the inherent characteristics of lead-free solder paste. Now, the solder paste manufacturer will provide a detailed explanation and analysis for everyone:

The main differences between lead-free solder paste containing silver and lead-free solder paste containing copper are as follows:

First, the metal compositions are different:Silver-containing lead-free solder paste is composed of tin-silver-copper or tin-bismuth-silver alloys, while tin-copper lead-free solder paste is made up of tin and copper alloys and does not contain silver metal components.

Second, different melting points: Due to the differences in metal alloys, their melting points also vary. containing3.0The melting point of silver solder paste is:217The melting point of lead-free tin-copper solder paste is:227Degree. Difference10Degree.

Iii. Different luster colors of solder joints: The luster color of solder joints affects the brightness and color of their appearance. Since silver metal is a matte metal rather than a bright one, the solder joints of silver-containing solder paste do not have a bright luster and present a matte color. In contrast, the luster of lead-free tin-copper solder paste shows a certain degree of brightness and looks more attractive. This is also one of the advantages of copper-containing solder paste. However, the luster color of the solder joint does not represent the soldering performance of the solder joint itself.

Fourth, different comprehensive performance: Due to the effect of silver metal, silver-containing solder paste has better and stronger firmness than copper-containing lead-free solder paste, and the solder joints are more secure. Secondly, electrical conductivity is also a very important indicator in solder joints. Silver is a metal with excellent electrical conductivity, so silver-containing solder paste has better electrical conductivity, thermal conductivity, etc. than copper-containing lead-free solder paste. These performances are all beyond the reach of copper-containing lead-free solder paste.

Five. Different costs: Due to the high price of silver metal, silver-containing solder paste is more expensive than lead-free copper-containing solder paste. This is the greatest advantage of copper-containing lead-free solder paste. The higher the silver content in silver-containing solder paste is, the more expensive the cost will be.

Shenzhen JJY Industrial Technology Co., Ltd. mainly engages in:LEDType solder paste, lead-containing solder paste, lead-containing silver solder paste, stainless steel plate type solder pasteSMTManufacturers of solder paste, lead-free flux, no-clean solder wire, lead-free solder wire, leaded solder wire, wave soldering strips, automatic soldering wires, etc.