Is conductive silver adhesive suitable for all metal surfaces?

Conductive silver paste, as an important electronic packaging material, plays a crucial role in fields such as microelectronic assembly and circuit connections. However, there has been controversy over whether conductive silver paste is suitable for all metal surfaces. This article will combine the research and development of Advanced Institute (Shenzhen) Technology Co., LtdLow temperature conductive silver adhesive - Research Platinum YB6016Explore the applicability of conductive silver paste on different metal surfaces using experimental data.

1、 Basic characteristics of conductive silver paste

Conductive silver paste is mainly composed of silver powder, resin matrix, curing agent, and other additives. Its high conductivity and good adhesion make it an ideal choice for connecting different materials. However, the surface properties, potential differences, and degree of oxidation of different metals may affect the bonding effect and conductivity of conductive silver paste.

2、 Experimental design and data comparison

In order to study the applicability of conductive silver paste on different metal surfaces,Advanced Institute (Shenzhen) Technology Co., LtdA systematic experimental test was conducted on YB6016, a platinum based compound. The experiment selected five common metal substrates: copper, aluminum, iron, nickel, and tin, and measured the adhesive strength, conductivity, and oxidation of conductive silver paste on these metal surfaces.

1. Adhesive strength test

Adhesive strength is a measureConductive silver adhesiveAn important indicator of the strength of the bond with the metal surface. The experimental results show that:

• Copper: The adhesive strength is 4.5 MPa, indicating a strong bond between YB6016 and the copper surface.
• Aluminum: The adhesive strength is 3.8 MPa, slightly lower than copper, but still exhibits good bonding performance.
• Iron: The adhesive strength is 4.2 MPa, which is not significantly different from copper and aluminum.
• Nickel: The adhesive strength is 4.7 MPa, which is the best among the five metals, indicating excellent compatibility between YB6016 and nickel surface.
• Tin: The adhesive strength is only 2.0 MPa, far lower than other metals, indicating poor bonding performance between YB6016 and tin surface.

2. Conductivity testing

Conductivity is another key indicator for measuring the performance of conductive silver paste. The experiment measured the coating on different metal surfacesResearch Platinum YB6016Evaluate its conductivity by measuring its electrical resistivity.

• Copper: with a resistivity of 1.5 × 10 ^ -8 Ω· m, it exhibits excellent conductivity.
• Aluminum: with a resistivity of 2.8 × 10 ^ -8 Ω· m, although slightly higher than copper, it still belongs to a good conductivity range.
• Iron: The resistivity is 3.2 × 10 ^ -8 Ω· m, and its conductivity is slightly inferior to copper and aluminum.
• Nickel: with a resistivity of 1.3 × 10 ^ -8 Ω· m, it has the best conductivity among the five metals.
• Tin: The resistivity is 6.5 × 10 ^ -8 Ω· m, much higher than other metals, and its conductivity is poor.

3. Observation of oxidation situation

The degree of oxidation on the metal surface has a significant impact on the bonding effect and conductivity of conductive silver paste. The oxidation of different metal surfaces coated with YB6016 was observed under a microscope.

• Copper: There is no obvious oxidation phenomenon on the surface, maintaining good conductivity.
• Aluminum: There is slight oxidation on the surface, but it does not affect the conductivity.
• Iron: The surface oxidation degree is moderate and has little effect on the conductivity.
• Nickel: Almost no oxidation phenomenon on the surface, maintaining excellent conductivity.
• Tin: Severe surface oxidation leads to a significant decrease in conductivity.

3、 Conclusion and Discussion

The experimental results indicate that,Research Platinum YB6016 Low Temperature Conductive Silver AdhesiveThere are differences in applicability on different metal surfaces. YB6016 exhibits excellent adhesive strength and conductivity on the surfaces of metals such as copper, aluminum, iron, and nickel. However, on the surface of tin, due to severe oxidation and insufficient bonding strength, the applicability of YB6016 platinum is poor.

This difference may be related to the potential difference, degree of oxidation, and surface properties of the metal. 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.

4、 Practical application suggestions

Based on the above experimental results, it is recommended that engineers and researchers who need to apply conductive silver paste on different metal surfaces fully consider the properties of the metal surface when selecting conductive silver paste. YB6016 is an ideal choice for metals such as copper, aluminum, iron, and nickel. However, for easily oxidizable metals such as tin, it may be necessary to seek other types of conductive adhesives or use special surface treatment techniques to improve bonding strength and conductivity.

In addition, in practical applications, attention should be paid to controlling process parameters such as coating thickness, curing temperature, and time of conductive silver paste to ensure the best bonding effect and conductivity.

In summary, conductive silver paste is not suitable for all metal surfaces. 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.