Silver metal powders
















Silver Metal Powder

  Silver metal powder is produced by a chemical reduction method using silver nitrate as a starting raw material, sodium hydroxide or ammonium hydroxide as a reactant, and formaldehyde as a reducing agent. The effects of changes in the ratio of silver nitrate to base concentration on the properties of silver microparticles were investigated.  The particle dimension and figure of the silver metal powder depended on the molar ratio of silver nitrate to a base and the properties of the ground.

History of Silver

Silver was known for its ancient civilization. Silver is a smooth, shapeable metal with a special glow. Also, thermal conductivity and electrical conductivity are the highest among metals. Silver is typically found in a single ore or in ores containing sulfides and arsenic, which is then recovered as cyanide and then reduced to metal in an aqueous solution using zinc. Although pure metals are stable to water and oxygen, they are eroded by sulfur-containing compounds in the air, forming a characteristic black layer of silver sulfide.

Physical properties of Sliver

Metal silver is available in shapes such as shots, pieces, powders, nanoparticles, Nanopowders, flakes, foils, wires, and tubes.   The following grades are available for powdered silver:  
  • Powdered Silver 81-451 is a high-purity, high-density spherical silver powder produced by the atomization method. By sieving 325/450 meshes, the grain size is 32-45 microns.
 
  • Powdered Silver 81-637 is a high-purity, high-density spherical silver powder produced by the atomization method. The particle size is 20-45 μm and can be applied to a 450/635 mesh sieve.
 
  • Silpowder 305 is a chemically precipitated, submicron-size, high-purity, highly dispersed silver powder. D50=1 micron.
   

Applications of pure Silver Powder

 

Press and bonding

Pure Silver powder with tiny average grain size is used for press and bonding of sputtering targets, chemical vapor deposition (CVD) and physical vapor deposition (PVD) (thermal deposition, electron beam (E-Beam) deposition, low-temperature organic deposition, atomic layer deposition (ALD), and organometallic chemical vapor deposition (MOCVD).  

High Surface area Treatment

Powders are also useful for all applications requiring high surface areas, such as water treatment, fuel cells, and solar cells. Nanoparticles also achieve a very high surface area. The average particle size of our standard powders ranges from -325 mesh, -100 mesh, 10 to 50 micron, and submicron (<1 micron). We also offer several nano-scale materials. Silver is also produced in compounds such as rods, ingots, pieces, pellets, disks, granules, wires, and oxides. Other shapes are also available upon request.

Jewelry

Jewelry, silver products, electronics, electrical contacts, stuffing of dental alloys, photo processing, batteries, solder and brazing alloys, water sterilization, etc

Photography

Silver powder is a precious metal, and its halide salts, especially silver nitrate, are widely used in photography. Its main applications include photography, the electrical and electronics industries, household tableware, jewelry, and mirrors.

Reaction with Light

Silver bromide and silver iodide react to light. When light is applied to the film-coated with these compounds, a part of the silver ions becomes a small core and returns to the metal, and when the film is developed with a reducing agent, other silver adheres to the body. When the negative reaches the desired density, the unaffected silver bromide or silver iodide is dissolved in a fixing agent to remove and leave an image.

Electrical Industry

Pure Silver powder is also used in the electrical industry, with silver paint used for printed circuits and silver electrical contacts used for computer keyboards. Since silver has catalytic activity, it is suitable for oxidation reactions. It is also used in dentistry, high capacity, and long-life zinc batteries.  

Bottom lines

Silver metal powders are suitable for conductive and thermal bonding of ambient-hardened welds, such as quartz resonators, infrared pyroelectric detectors, piezoelectric ceramics, potentiometers, flash tubes, shields, and circuit repair. Metal Silver Powder Converted to Low-Temperature Silver Paste for PET Substrate-Based Membrane Switches and Flexible Circuit Boards.