1. Chemical composition

Main components: silver (Ag), copper (Cu), zinc (Zn), tin (Sn), nickel (Ni), etc., with different proportions depending on the grade (such as Ag20CuZn, Ag72Cu, etc.).

Silver content: directly affects the melting point, wettability, and cost of brazing materials, and must strictly comply with standards (such as GB/T 10046 and AWS A5.8).

Impurity control: Harmful impurities such as lead (Pb), bismuth (Bi), and sulfur (S) need to be limited (usually ≤ 0.1%) to avoid affecting the performance of brazed joints.

2. Physical properties

Melting point range: Select according to application requirements (such as the melting point of low-temperature brazing material Ag Cu Zn system is 600~800 ℃).

Particle size distribution: The powder particle size (such as -200 mesh, -300 mesh) needs to be uniform, which affects the flowability and coating performance.

Loose density: reflects the state of powder accumulation and affects filling properties (usually 1.5-4.0 g/cm3).

Liquidity: measured by Hall flowmeter (unit: s/50g), affecting the powder feeding performance in automatic production.

3. Compliance with standards

International/Industry Standards:

China: GB/T 10046 "Silver Solder"

US: AWS A5.8 (such as BAg-1 to BAg-24 series)

Europe: EN ISO 17672 (e.g. Ag 100~Ag 800 series)

4. Scope of application

Silver brazing powder (silver based brazing material powder) is widely used in multiple industrial fields due to its excellent wettability, conductivity, corrosion resistance, and low to medium temperature brazing performance. The following are its main usage classifications and typical application scenarios:

① Electronics and Electrical Industry

-Microelectronics packaging: used for soldering chips and substrates (such as ceramics and copper substrates) to ensure high conductivity and thermal conductivity (such as Ag Cu eutectic solder).

-Relay/switch contacts: brazed silver alloy contacts reduce contact resistance and improve durability.

-Vacuum electronic devices: In sealed welding of vacuum tubes, X-ray tubes, etc., silver solder powder can form airtight joints.

② Refrigeration and air conditioning equipment

-Compressor pipeline connection: brazed copper pipes and stainless steel components (such as Ag-Cu-P, Ag Cu Zn series), resistant to cold and hot cycles and vibration.

-Manufacturing of heat exchangers: used for brazing copper tubes and aluminum fins (requiring specialized brazing agents).

③ Aerospace and Military Industry

-Engine components: high-strength brazing of turbine blades and fuel nozzles (such as Ag Cu Ni brazing material containing nickel, high temperature resistance).

-Spacecraft thermal control system: brazed heat pipes and radiators, requiring high reliability and adaptability to vacuum environments.

④ Automotive industry

-Sensor brazing: Sealing welding of oxygen sensors and pressure sensors (such as Ag Cu Sn low-temperature brazing material).

-Battery connection: Copper/aluminum conductive plates for brazing of new energy vehicle battery modules require low resistance and high fatigue resistance.

⑤ Tools and Hard Alloys

-Cutting tool manufacturing: brazing of hard alloy cutting heads with steel substrates (such as Ag Cu Zn Cd or environmentally friendly Ag Cu Zn Sn brazing materials).

-Diamond tools: Brazing diamond abrasive particles onto a metal substrate to improve tool life.

⑥ Medical equipment

-Surgical instrument welding: Precision brazing of stainless steel or titanium alloy instruments, requiring biocompatibility (such as cadmium free brazing materials).

-Dental restorations: brazing of precious metal crowns and bridges using Ag Au Pd brazing materials.

⑦ Energy and Electricity

-Solar collector: The brazing of copper pipes and heat absorbing plates requires weather resistance and thermal conductivity efficiency.

-Power bus connection: low resistance brazing of high current conductors (such as high silver content brazing materials).

⑧ Jewelry and Precision Machinery

-Precious metal jewelry repair: seamless brazing of gold and silver jewelry (low-temperature silver brazing material to avoid deformation).

-Clock parts: micro brazing of precision gears and shaft sleeves.