Study on the stability of conductivity of low-temperature conductive silver paste after low-temperature curing

With the rapid development of modern electronic technology, conductive silver paste has been widely used in fields such as electronic packaging, interconnection, and surface packaging due to its excellent conductivity and good adhesive properties. However, traditional conductive silver adhesives have high curing temperatures and long curing times, which not only increase production costs but may also have adverse effects on the substrate. Therefore, the development of low-temperature curing conductive silver paste is particularly important. This article will combine the research and development of Advanced Institute (Shenzhen) Technology Co., LtdResearch Platinum Brand YB6016 Low Temperature Conductive Silver AdhesiveExplore in depth the stability of its conductivity after low-temperature curing using experimental data.

Experimental Materials and Methods

The experimental materials mainly include YB6016 low-temperature conductive silver paste from Yanbo brand, as well as five common metal substrates: copper, aluminum, iron, nickel, and tin. The experimental method includesConductive silver adhesiveApply evenly on the metal surface, control the coating thickness to be consistent, and then cure at 100 ℃ for 30 minutes. Afterwards, measure the adhesive strength, electrical resistivity, and oxidation status of the cured sample separately.

Experimental data and result analysis

Adhesive strength:

The experimental results show that,Research Platinum YB6016 Low Temperature Conductive Silver AdhesiveThe adhesive strength on copper, aluminum, iron, and nickel surfaces is relatively high, at 4.5MPa, 3.8MPa, 4.2MPa, and 4.7MPa, respectively, while the adhesive strength on tin surfaces is relatively low, at only 2.0MPa. This indicates that YB6016 has good bonding properties with copper, aluminum, iron, and nickel, but poor bonding properties with tin.

Electrical resistivity:

In terms of resistivity, YB6016 exhibits low resistivity on copper, aluminum, iron, and nickel surfaces, with resistivity values of 1.5 × 10 ^ -8 Ω· m, 2.8 × 10 ^ -8 Ω· m, 3.2 × 10 ^ -8 Ω· m, and 1.3 × 10 ^ -8 Ω· m, respectively, demonstrating excellent conductivity. On the surface of tin, the resistivity is relatively high, at 6.5 × 10 ^ -8 Ω· m, and the conductivity is relatively poor.

Oxidation situation:

In terms of oxidation, there is almost no oxidation phenomenon on the surfaces of copper and nickel, while there is slight oxidation on the surfaces of aluminum and iron, but it does not affect the conductivity. However, the surface oxidation of tin is severe, resulting in a significant decrease in conductivity.

Analysis and Discussion

1. Curing conditions: YB6016 can achieve good conductivity and adhesive strength by curing at 100 ℃ for 30 minutes, which is much lower than the curing conditions of traditional conductive silver adhesives, demonstrating its excellent low-temperature curing characteristics.

2. Metal surface properties: Differences in potential, degree of oxidation, and surface properties of different metal surfacesConductive silver adhesiveThe bonding effect and conductivity have a significant impact. For example, tin has a lower potential and is prone to galvanic corrosion with silver, leading to surface oxidation and decreased adhesive strength. Nickel has a higher potential and better compatibility with silver, thus exhibiting excellent conductivity and adhesive strength.

3. Stability of conductivity: Experimental results show that after low-temperature curing, YB6016 exhibits stable conductivity on copper, aluminum, iron, and nickel surfaces with minimal changes in resistivity. This indicates that YB6016 has good conductivity stability and is suitable for electronic packaging and interconnection applications under various low-temperature curing conditions.

conclusion

in summary,Research Platinum Brand YB6016 Low Temperature Conductive Silver AdhesiveAfter low-temperature curing, the conductivity and adhesive strength on the surfaces of metals such as copper, aluminum, iron, and nickel are good, and they exhibit high stability. However, on the surface of easily oxidizable metals such as tin, their conductivity and adhesive strength are poor. Therefore, when selecting and applying conductive silver paste, the properties and compatibility of the metal surface should be fully considered to ensure the quality and reliability of electronic products.

The above data is for reference only, and specific performance may vary due to production processes and product specifications.