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BAg45CuZnSn silver-copper-zinc-tin brazing alloy
Powdered · Paste-like, available in dual forms High silver content · Excellent wetting · High-strength joints
Core Advantages of BAg45CuZnSn Brazing Alloy
Excellent wettability · High fluidity
With a tin content of 2.0–3.0%, it significantly reduces surface tension and exhibits excellent wetting and spreading on stainless steel, cemented carbides, and copper alloys.
High bonding strength
The brazed joint is dense, with a tensile strength of ≥300 MPa, and exhibits excellent resistance to thermal cycling and corrosion, making it suitable for high-reliability joints.
Medium-Temperature Brazing · Base-Material Friendly
The brazing temperature ranges from 677 to 813°C, which is lower than that of high-silver brazing alloys, thereby minimizing overheating of the base metal and grain coarsening.
Dual Form · Process Compatibility
The powder form (−200/−300 mesh) is suitable for automated powder feeding and laser cladding; the paste form can be used for dispensing and screen printing, and is ready to use straight out of the container.
Product Real-World Photos & Microscopic Morphology
Powder SEM (-300 mesh)
Spherical or near-spherical particles with uniform particle size and excellent flowability.
Real-life photo of powdered brazing filler metal
Yellowish-brown powder, packaged in vacuum-sealed aluminum foil bags or plastic canisters.
Real-life photo of paste-type solder alloy
Syringe/plastic can packaging, stable viscosity, optional no‑clean formulation.
BAg45CuZnSn high-silver, tin-containing silver-based brazing alloy
BAg45CuZnSn is a silver‑copper‑zinc‑tin brazing alloy containing 44–46% silver; the addition of 2–3% tin lowers its melting point (solidus at 640°C) and significantly enhances its wettability compared with conventional BAg45CuZn. Joints made with this alloy exhibit high tensile strength (≥300 MPa), excellent electrical and thermal conductivity, and superior corrosion resistance. The powdered form is produced via vacuum atomization followed by precision sieving, yielding particle sizes down to −200 mesh (≤75 μm) and −300 mesh (≤48 μm), with outstanding flowability suitable for automated powder feeding, laser cladding, and the pressing of preformed solder foils. The paste formulation combines the powder with an organic binder, achieving a solids content of 80–90%, a viscosity of 50–200 Pa·s, and good thixotropy, making it ideal for automated dispensing, screen printing, and manual coating. This material finds broad applications in electronic packaging, the refrigeration industry, cemented carbide tools, medical devices, and other fields.
Chemical Composition (wt%, powder)
| Grade | Ag | Cu | Zn | Sn | Solidus (°C) | Liquidus temperature (°C) | Brazing temperature (°C) |
|---|---|---|---|---|---|---|---|
| BAg45CuZnSn | 44-46 | 26-28 | 23.5-27.5 | 2.0-3.0 | 640 | 680 | 677-813 |
* Complies with AWS BAg-36 and meets RoHS requirements. Powder specifications: -200 mesh, -300 mesh; custom particle sizes available.
Solder Paste Specifications
| Grade | Alloy powder content (wt%) | Binder (wt%) | Solidus (°C) | Liquidus temperature (°C) | Viscosity (Pa·s) | Recommended Process |
|---|---|---|---|---|---|---|
| BAg45CuZnSn solder paste | 80-90 | Margin | 640 | 680 | 50-200 | Automatic dispensing, screen printing, manual application |
Reference for BAg45CuZnSn Brazing Process
| Base material combination | Recommended Brazing Temperature (°C) | Flux/Atmosphere | Joint strength |
|---|---|---|---|
| Stainless steel - stainless steel | 730-780 | FB102 / Argon/Vacuum | ≥320MPa |
| Stainless steel–copper | 700-760 | FB102 / Argon gas | ≥300MPa |
| Carbide-steel | 740-800 | FB104 / Vacuum | ≥280MPa |
| Copper alloy - copper alloy | 680-730 | FB102 / Nitrogen | ≥280MPa |
* It is recommended to use a flux specifically designed for silver brazing; vacuum or inert-gas protection yields the best joint quality.
BAg45CuZnSn vs. traditional BAg45CuZn
| Performance Comparison | BAg45CuZnSn (containing Sn) | BAg45CuZn (Sn-free) |
|---|---|---|
| Liquidus temperature (°C) | 680 | 720 |
| Wettability (on stainless steel) | ✓ Significant improvement | Good |
| Caulking ability | ✓ Better | General |
| Brazing seam toughness | ✓ Improve | Medium |
| Liquidity | ✓ Excellent | Good |
The addition of tin enables BAg45CuZnSn to achieve a lower melting point and improved wettability while maintaining a high silver content, making it particularly well suited for brazing stainless steel and dissimilar materials.
Typical application areas
Electronic packaging
Semiconductor chips, vacuum tube components, electrical contacts, precision connectors
Refrigeration industry
Automated welding of compressor piping, condensers, and heat exchangers
Carbide cutting tools
High-strength bonding of cutting tools, drill bits, and dies to steel substrates
Medical device
Stainless steel instruments, miniature components, brazing in an oxygen-free environment
Automotive industry
Sensors, heat exchangers, fuel line fittings
Precision instruments
Instrument components, optical devices, robotic joints
Powdered brazing filler metal (-200 mesh / -300 mesh)
- Excellent flowability, with a Hall flow rate of ≤28 s/50 g, making it suitable for automated powder feeding.
- The powder can be applied directly, or pre‑formed solder tabs can be pressed on.
- Vacuum-packed for a long shelf life.
- It can be blended with other metal powders to formulate special compositions.
Paste-type brazing filler metal (ready-to-use)
- Open the can and use immediately—no need to mix powder and adhesive on site.
- Excellent thixotropy, precise dispensing and printing, no sagging.
- The carrier volatilizes completely, leaving minimal residue (a no‑clean formulation is available).
- Viscosity is adjustable, making it compatible with various dispensing equipment and manual coating applications.
End-to-end testing capability
Each batch of BAg45CuZnSn powder and solder paste is tested for chemical composition (Ag, Cu, Zn, Sn), particle size distribution, oxygen content, flowability, and loose bulk density, with a Certificate of Analysis (COA) provided.
Packaging & Delivery
Welding powder packaging
Double-layer aluminum‑film pouch or plastic canister, vacuum‑sealed, then packed in a steel drum or plastic drum.
Specifications: 1 kg, 5 kg, 10 kg, 25 kg
Solder paste packaging
Syringe or plastic container
Store refrigerated; shelf life: 6 months.
Delivery time
In-stock items ship within 2–4 days after order confirmation.
Custom solder paste, ships in 3–7 days.
Batch Traceability
Sample retained for each batch; COA report shipped with the goods.
Quality documents are available.
Free sample
Provide samples
For brazing process validation
Technical Support
Provide brazing temperature recommendations.
Assist customers in resolving welding-related issues.
Inquire Now for Free Samples
Fill out the form on the right or contact us directly; we will provide product samples, technical data sheets, and price quotes to help you quickly complete your additive manufacturing process validation.
Address: No.39, Liandong Yougu lnd. Park, Bachelor Street,Changsha City,Hunan Province, China.
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Address: No.39, Liandong Yougu lnd. Park, Bachelor Street,Changsha City,Hunan Province, China.
