Silver powder is a precious metal powder with very high electrical and thermal conductivity. It is used, amongst other things, for electrical contacts, electrodes, conductive adhesives, conductive varnishes and functional coatings. Different grain sizes and shapes allow it to be tailored to various industrial manufacturing processes.
NMD Metalpowders can help you choose the right grade of silver powder. As part of our range of special metal powders Silver powder offers a wide range of possibilities for electronics, materials development and demanding technical applications.
Technical specifications and powder variants
- Material: Silver, chemical symbol Ag, a member of the group of precious metals.
- Grain sizes: Depending on the manufacturing process and the quality of the powder, from around 50 nm to 500 µm.
- Grain shapes: Spherical, platelet-shaped (like silver flakes), spongy or crystalline.
- Electrical conductivity: Very high, and therefore of particular interest for conductive materials and contact materials.
- Thermal conductivity: Ideal for heat transfer and heat dissipation applications.
The particle sizes mentioned describe different grades of powder. For a specific application, the particle size distribution, particle shape, purity and surface characteristics are tailored to the requirements of the process.
Applications of silver powder
Electrical contacts and electrodes
In the Semiconductors and electronics Silver powder is used to produce conductive structures, electrodes and contact materials. This also includes silver composites, in which silver is combined with other materials. Its high conductivity facilitates the development of components with low electrical resistance.
Conductive adhesives, conductive varnishes and conductive coatings
Silver powder and silver flakes are used as conductive fillers in adhesives, pastes, printing inks and varnishes. Such formulations are used, for example, in printed electronics, electrical connections and functional Surface coatings used.
The particle shape influences how the particles interact within the formulation and form conductive networks. The silver content, the binder system and the processing are also crucial to the result.
Thermally conductive materials for electronics
Silver’s high thermal conductivity is utilised in thermally conductive adhesives, pastes and interface layers. These materials aid heat dissipation from electronic components. The thermal conductivity that can actually be achieved depends on the composition and structure of the finished material.
Additive manufacturing and component development
For selected processes in the additive manufacturing Silver powders with the appropriate properties are suitable for this purpose. They can be used to develop complex geometries and functional components that utilise the electrical or thermal properties of the precious metal.
Particle size distribution, particle shape, flow behaviour and process parameters are particularly relevant to the manufacturing process. Consequently, a powder quality suitable for structural adhesives does not automatically meet the requirements of a powder-based 3D printing process.
Antimicrobial applications and medical technology
Silver-containing materials are also being developed for antimicrobial surfaces. Their effectiveness depends, amongst other things, on the release of active silver ions, their concentration and how they are incorporated into the material. It must therefore be assessed in the finished product.
Silver-containing materials are also used in medical and dental technology. This requires the selection of materials tailored to the specific application and appropriate evidence of suitability.
Choosing the right silver powder for your manufacturing process
Whether for electrical contact materials, conductive coatings or additive manufacturing: the appropriate grade of silver powder depends on the desired function and the manufacturing process. In addition to particle size and shape, purity, dispersibility, flow behaviour and, where applicable, sintering behaviour should also be taken into account.
With our tailor-made powder solutions NMD Metalpowders helps you to define your requirements and source materials of the appropriate quality.
Enquire about silver powder at NMD Metalpowders
You will need Silver powder for your industrial applications?
Please let us know the intended application, the quantity required and your specifications regarding particle size, particle shape and purity.
Enquire about silver powder from NMD Metalpowders and let us advise you on the right grade of powder.
