The production process of sinter paste

The production process of sinter paste varies according to its specific type and application field. The following is the general sintering paste production process, as well as the detailed production process for specific types of sintering paste (such as nano silver paste, self-sintering nano brazing paste).

General sinter paste production process

Material preparation: According to the formula of the sinter paste, prepare the required raw materials, such as metal powder, additives (such as dispersants, adhesives, thinners, etc.), solvents, etc.

Mixing and dispersion: the metal powder and additives, solvents, etc., are mixed evenly to form a uniform paste. This process may require the use of dispersants to prevent the agglomeration of metal particles, and the use of adhesives and thinners to regulate the viscosity and fluidity of the paste.

Grinding and filtration: The mixed paste is ground to ensure an even distribution of metal particles, and impurities and particles are removed by filtration.

Molding and drying: The ground paste is made into the desired shape by an appropriate molding process (such as extrusion, injection molding, etc.) and is dried to remove solvents and moisture in the paste.

Sintering: The dried sinter paste is placed in the sintering furnace and sintered at high temperature to form a metallurgical bond between the metal particles and form a dense sintered body.

Nano silver paste production process

Material preparation: Prepare nano silver particles, dispersants (such as sodium citrate), adhesives, diluents, etc.

Mixing and dispersing: the nanoparticle silver particles are evenly mixed with dispersants, adhesives, diluents, etc., to form a uniform nanoparticle silver paste.

Grinding and filtration: The mixed nano silver paste is ground to ensure a uniform distribution of nano silver particles and to remove impurities and particles through filtration.

Molding and drying: The nano-silver paste after grinding is made into the required shape through the appropriate molding process and is dried.

Sintering: The dried nano silver paste is placed in the sintering furnace, and the pressure free sintering or hot press sintering is carried out at low temperature, so that the metallurgical bond between the nano silver particles is formed to form a dense sintered body.

Production process of self sintering nano brazing paste

Preparation of copper paste: Dissolve copper chloride in hot water, add citric acid and sodium hypophosphite reaction, centrifuge cleaning, to obtain citric acid-coated copper nanoparticles. Copper paste was formed by mixing nano copper particles with ethanol.

Preparation of firing aid: the complexing agent, reducing agent and surfactant are uniformly mixed to form firing aid.

Mixing and drying: the copper paste and the burning agent are mixed evenly according to a certain proportion, and dried.

Sintering: The self-sintering nano brazing paste after drying is placed in the appropriate position, without additional heating or atmosphere protection, and can be sintered only by the heat release of its own chemical reaction.

Matters needing attention

In the production process, the process parameters of each step should be strictly controlled, such as temperature, time, pressure, etc., to ensure the quality and performance of the sinter paste.

Different types of sinter paste may require the use of different equipment and tools, such as sintering furnaces, grinders, filtration devices, etc.

When using sintered paste for connection or packaging, the corresponding process specifications and safety operating procedures should be followed.

To sum up, the production process of sinter paste is a complex and delicate process that needs to be adjusted and optimized according to the specific type and application field.