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AgCuNi silver-copper-nickel alloy powder · ISO 17672 Ag 672
Specifically designed for brazing and welding · High strength and high conductivity -300mesh
Why choose -300 mesh for precision brazing?
Ideal particle size distribution
-300 mesh exhibits excellent particle size distribution, yielding a uniform paste that does not settle; dispensing and printing are crisp and precise, the solder melts consistently, and the joints are fully filled with no porosity.
Excellent wettability
Nickel synergistically purifies the powder surface, exhibiting strong wettability on stainless steel, Kovar alloy, and high‑temperature alloys, with excellent gap‑filling performance.
High-strength, high-conductivity brazed joint
The joint exhibits high strength and excellent electrical conductivity, meeting the stringent reliability requirements of aerospace and electronic packaging applications.
Low oxygen · Minimal spatter
Oxygen content is well controlled, resulting in minimal oxide inclusions under vacuum brazing or atmosphere‑protected conditions; the welds exhibit a bright finish, and the service life of the vacuum furnace is extended.
Product Real-World Photos & Microscopic Morphology
High-spherical -300 mesh powder
Good sphericity, very few satellite particles, and uniform particle size, meeting the requirements for high-precision brazing pastes.
Vacuum packaging / Batch traceability
Aluminum foil pouches plus dedicated plastic containers, accompanied by a full‑inspection COA report to ensure welding consistency.
Typical Brazed Joint Case Studies
Vacuum brazing of stainless steel/copper assemblies yields fully filled, porosity-free brazed joints with excellent bond strength.
AgCuNi -300 mesh powder: the performance benchmark for welding applications
AgCuNi (silver–copper–nickel) alloy powder is a high‑end silver‑based brazing filler metal that conforms to AWS A5.8 BAg‑24, ISO 17672 Ag 672, and GB/T 10046 BAg72CuNi standards. It contains approximately 72% silver, 28% copper, and 0.5–1.0% nickel. Compared with conventional AgCu28 eutectic brazing alloys, the addition of nickel significantly enhances the thermal stability, creep resistance, and corrosion resistance of brazed joints, ensuring excellent strength even at elevated service temperatures. Its particle size, screened through a 300‑mesh sieve, is specifically engineered for use in brazing pastes, preformed solder foils, and powder‑spray brazing processes, making it the performance benchmark in the field of high‑precision brazing.
This product is manufactured using a non‑vacuum gas atomization process, yielding excellent sphericity, superior flowability, and a narrow particle size distribution. When blended with organic carriers, it exhibits outstanding thixotropy, enabling crisp dispensing and printing; the brazing alloy melts uniformly, producing well‑filled joints free of porosity. The nickel content synergistically purifies the powder’s surface activity, ensuring strong wettability on base materials such as stainless steel, Kovar alloy, high‑temperature alloys, and copper alloys, with excellent gap‑filling capability. With tightly controlled oxygen levels, minimal oxide inclusions form during vacuum brazing or under protective atmospheres, resulting in bright welds and extended service life for vacuum furnaces. This product is widely employed in high‑end applications including electronic packaging, aerospace heat exchangers, vacuum arc‑extinguishing chambers, and brazing of medical devices.
TIJO employs a non‑vacuum atomization process to produce spherical AgCuNi powder, with the -300 mesh specification (D50 35–48 μm) as its flagship grade. The powder features an oxygen content of ≤0.05%, a loose packing density of ≥4.9 g/cm³, and a flow time of ≤22 s/50 g. It complies with AWS A5.8, ISO 17672, and GB/T 10046 standards and meets RoHS environmental requirements, with no detectable cadmium or lead. This product is suitable for vacuum brazing (<5×10⁻³ Pa), brazing under hydrogen, argon, or dissociated ammonia atmospheres, automated dispensing, screen printing, and pre‑formed solder tabs, among other processes. Nickel content and particle size can be finely adjusted to meet specific customer requirements.
💡 Sample Description: Due to the relatively high price of silver-based brazing filler metal, this product does not offer free samples. We do provide small‑quantity powder samples in 50 g, 100 g, 500 g, and other weights; please contact our sales team for sample pricing inquiries.
Typical Chemical Composition (wt%)
| element | Ag | Cu | Ni | Total impurities | O (oxygen content) | Other heavy metals |
|---|---|---|---|---|---|---|
| Standard specification value | Margin (71–73) | 26.5~28.5 | 0.5~1.0 | ≤0.15 | — | ≤0.05 |
| Typical Values for Internal Control | 72.0±0.3 | 27.2±0.3 | 0.75±0.1 | ≤0.08 | ≤0.05 | Cd and Pb were not detected. |
* The oxygen content in the -300 mesh powder batches is well controlled, meeting the requirements of the brazing industry. The addition of nickel significantly enhances the joint’s high-temperature strength and corrosion resistance, with the Ni content readily adjustable to meet customer specifications. Harmful heavy metals such as Cd and Pb were not detected, ensuring compliance with RoHS environmental standards.
Core particle size specifications: -300 mesh (for welding applications) and other optional particle sizes.
| Particle size specification | Corresponding Mesh Count/Usage | D10 (μm) | D50 (μm) | D90 (μm) | Loose bulk density (g/cm³) | Flowability (s/50g) | Typical Welding/Process Matching |
|---|---|---|---|---|---|---|---|
| ★ -300 mesh | ≤48μm | ≥12 | 35~48 | ≤70 | ≥4.9 | ≤22 | Vacuum/atmosphere brazing paste, automated dispensing, preformed solder foil powder |
* -300 mesh is the preferred particle size for welding applications and is suitable for preparing high-precision brazing pastes. Other particle sizes are available upon request.
| Parameter item | Value/Condition | The significance of welding |
|---|---|---|
| Melting point range | Solidus ~790°C, liquidus ~850°C | Narrow melting range and stable fluidity, making it suitable for rapid heating and precision brazing. |
| Recommended brazing temperature | 860℃ ~ 950℃ (vacuum/hydrogen/argon) | The joint is dense, with no risk of overheating the base metal, and features a wide process window. |
| Shear strength of the joint (stainless steel/316L) | Excellent | Meets the requirements for aerospace structural components. |
| Electrical conductivity | Excellent | Suitable for conductive and grounding components; RF devices exhibit no signal attenuation. |
| Thermal conductivity (20°C) | Excellent | Rapid heat dissipation to prevent thermal stress concentration. |
-300 mesh AgCuNi powder brazing process reference
| Base material type | Recommended Brazing Temperature (°C) | Protective atmosphere/vacuum level | Welding characteristics |
|---|---|---|---|
| Stainless steel (304/316L) | 820~850 | Vacuum <5×10⁻³ Pa / Pure hydrogen | Good wetting, with smooth solder spreading. |
| Superalloy (GH4169) | 840~870 | Vacuum or argon gas | The interface is free of brittle phases, and the high-temperature performance is stable. |
| Copper alloy (CuCrZr) | 800~830 | Hydrogen atmosphere or nitrogen plus hydrogen | The diffusion layer is thin, with excellent electrical and thermal conductivity. |
| Kovar alloy | 820~850 | Ammonia decomposition or vacuum | High airtightness, compatible with ceramic-metal packaging. |
* It is recommended to mix -300 mesh powder with a dedicated brazing paste carrier, dispense or print the mixture, and then perform vacuum brazing to achieve bright, clean welds.
AgCuNi vs. Conventional AgCu28 Brazing Advantages
| Comparison dimension | AgCuNi (-300mesh) | Traditional AgCu28 brazing alloy |
|---|---|---|
| High-temperature strength | ✓ Maintain high room-temperature strength | A significant decline |
| Corrosion resistance (salt spray/weak acid) | ✓ Significant improvement, nickel passivation | Generally, interfacial corrosion is likely to occur. |
| Wettability (on stainless steel) | ✓ Increased spreading area | Good, but requires a higher temperature. |
| Brazed joint density | ✓ Low porosity (not produced by vacuum atomization) | Micro-pores may occur. |
The addition of nickel refines the grain structure and enhances the joint’s creep resistance and thermal shock resistance, making it the standard upgrade for aerospace‑grade brazing.
End-to-end inspection capability (ensuring weld batch consistency)
Each batch of –300 mesh powder undergoes comprehensive inspection for particle size, oxygen content, chemical composition, flowability, and tapped density, and brazing test specimens are periodically prepared to verify joint strength and wetting angle. COA reports and recommended process parameters are provided to ensure consistent weld quality across batches.
Typical welding application scenarios
Vacuum & Refrigeration
Vacuum interrupter contacts, refrigerant piping fittings, and compressor sealing assemblies
Aerospace
Brazed joints for aerospace structural components and heat exchangers in aircraft engines
Electronic packaging
Power semiconductor modules, integrated circuit lead frames, vacuum electronic devices
Precision manufacturing
Brazing of medical devices, precision sensors, and optical components
Packaging & Delivery
Powder packaging
Vacuum-sealed in a double-layer aluminum foil pouch (to prevent oxidation), with an outer iron or plastic drum.
Specifications: 1 kg, 5 kg, 10 kg, 25 kg, 50 kg per drum
Export packaging
Export orders are packed in wooden crates or palletized and reinforced to protect against moisture and impact.
Compatible with sea, air, and international express shipping.
Delivery time
Standard particle size in stock; ships within 5–7 days after order confirmation.
Custom particle size or minor formulation adjustments: 7–15 days
Batch Traceability
For each batch, a sample is retained, and the COA report is shipped with the goods.
Supports third-party testing (e.g., SGS)
Small-gramage sample
Supports the purchase of 50 g, 100 g, and 500 g samples of powders and solder pastes.
Due to the high price of silver-based brazing filler metal, free samples are not available; trial samples must be purchased.
Customized Services
Grain size customization, fine-tuning of Ni content
Meets special operating conditions and equipment requirements
Shipping documents
COA, MSDS, ingredient list, packing list
Meets export customs clearance requirements and customer in-plant inspection standards.
Technical Support
Provide guidance on brazing process parameters.
Assist in resolving issues encountered during use.
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.
