Basic concepts, characteristics, preparation methods, and application fields of pressure sintered silver

Pressure sintered silver is an efficient and reliable electronic packaging material widely used in the electronics industry.
This article will introduce the basic concepts, characteristics, preparation methods, and application fields of pressure sintered silver.

1、 Basic concepts of pressure sintered silver

Pressure sintered silver refers to the formation of silver materials with high conductivity, strength, and corrosion resistance through atomic diffusion and recrystallization mechanisms under high temperature and pressure conditions. Its main component is Ag, and its performance is usually improved by adding other elements such as Ni, Cu, Sn, etc.

2、 Characteristics of pressure sintered silver

1. Good conductivity: Pressure sintered silver has good electrical conductivity and is suitable for fields such as high-frequency circuits and microelectronic devices.

2. High strength: Pressure sintered silver has excellent mechanical properties, with a strength that can reach 2-3 times or more that of similar materials, making it more suitable for the high-strength connection requirements of electronic devices.

3. Good corrosion resistance: Pressure sintered silver has good chemical corrosion resistance and is not easily oxidized or reacted with other metals, which increases its application range in electronic devices.

4. Low coefficient of thermal expansion: The linear expansion coefficient of pressure sintered silver is low, which matches common circuit board materials and reduces the risk of failure caused by temperature differences.

5. Simple production process: The process of preparing pressure sintered silver is relatively simple, with low production costs and easy scale production.

3、 Preparation method of pressure sintered silver

The preparation of pressure sintered silver generally consists of two steps: preparing sintered powder and sintering molding.

1. Preparation of sintered powder: Firstly, pure silver is mixed with other added metal elements, and then the mixture is made into micrometer sized uniform powder through high-energy ball milling, atomization and other methods.

2. Sintering molding: Powder is added to a steel mold, and after cold pressing and hot pressing, a preliminary compact body is obtained. Then, the green body is placed in the furnace and sintered under high temperature and high pressure to form atomic bonds between the powder particles, ultimately obtaining a silver material with high strength and high conductivity.

4、 Application areas of pressure sintered silver

Pressure sintered silver has a wide range of application fields, mainly including the following aspects:

1. Marine industry: Due to its excellent corrosion resistance, pressure sintered silver is widely used in marine industries, such as ship electronic equipment and submarine cables.

2. Microelectronic devices: The high conductivity and low coefficient of linear expansion of pressure sintered silver make it suitable for fields such as soldering, bonding, and connection in microelectronic devices.

3. New energy vehicles: Pressure sintered silver is used in fields such as battery systems and motor control systems for new energy vehicles,

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