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AgCuNi silver-copper-nickel alloy powder
Specifically designed for brazing and soldering · -300 mesh Best-selling particle size
★ Core supply particle size: -300 mesh (D50 ≈ 35–48 μm) — Optimized for welding applications, readily available in stock, and customizable.
Why choose -300 mesh for precision brazing?
Ideal particle size distribution
-300 mesh (≤48 μm) exhibits excellent particle size distribution, resulting in a uniform paste that does not settle; dispensing and printing are crisp, solder melts consistently, and 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 a gap‑filling capability of ≥95%.
High-strength, high-conductivity brazed joint
The joint exhibits a shear strength of 220–280 MPa and an electrical conductivity exceeding 45% IACS, meeting the stringent reliability requirements of aerospace and electronic packaging applications.
Low oxygen · Minimal spatter
Oxygen content ≤ 0.05%; minimal oxidic inclusions under vacuum brazing or atmosphere‑protected conditions; bright weld seams; extended service life of the vacuum furnace.
Product Real-World Photos & Microscopic Morphology
High-spherical -300 mesh powder
Sphericity ≥ 92%, with 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 consistent welding quality.
Typical Brazed Joint Case Studies
Vacuum brazing of stainless steel/copper assemblies yields fully filled, porosity-free brazed joints with strength exceeding the yield strength of the base material.
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, with a particle size of –300 mesh, specifically designed for use in brazing pastes, preformed brazing foils, and powder‑spray brazing processes. The addition of 0.5–1.0% nickel significantly enhances the thermal stability, creep resistance, and corrosion resistance of brazed joints, enabling the material to maintain high strength even at service temperatures up to 350°C. Produced by vacuum atomization, this powder exhibits excellent sphericity and flowability; when blended with organic carriers, it demonstrates outstanding thixotropic properties. It is widely employed in electronic packaging, aerospace heat exchangers, vacuum arc‑extinguishing chambers, medical device brazing, and other applications. The powder complies with AWS A5.8 BAg‑24 and ISO 17672 standards and meets RoHS environmental requirements.
Typical Chemical Composition (wt%, in accordance with AWS A5.8 / ISO 17672)
| 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 of the -300 mesh powder batch is consistently maintained below 400 ppm, significantly exceeding the requirements of the brazing industry. Nickel content can be finely adjusted to meet customer specifications (0.3–1.2%).
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 packing 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, with a Hall flow rate of ≤22 s/50 g, making it suitable for preparing high-precision brazing pastes. Other particle sizes, such as -200/+325 mesh, are available upon request, with a lead time of 3–5 days.
| 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) | 240~280 MPa | 30% higher than that of conventional Ag–Cu eutectic brazing alloys, meeting the requirements for aerospace structural components. |
| Electrical conductivity | 45~50% IACS | Suitable for conductive and grounding components; RF devices exhibit no signal attenuation. |
| Thermal conductivity (20°C) | ≈170 W/(m·K) | 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 | Shear strength of the joint (MPa) | Welding characteristics |
|---|---|---|---|---|
| Stainless steel (304/316L) | 820~850 | Vacuum <5×10⁻³ Pa / Pure hydrogen | 250~280 | Wetting angle ≤ 15°, with smooth solder spreading. |
| Superalloy (GH4169) | 840~870 | Vacuum or argon gas | 220~260 | 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 | 190~240 | The diffusion layer is thin, with excellent electrical and thermal conductivity. |
| Kovar alloy | 820~850 | Ammonia decomposition or vacuum | 200~240 | High airtightness, compatible with ceramic-metal packaging. |
* It is recommended to mix -300 mesh powder with a dedicated brazing paste carrier (solid content 85–90%), apply the paste by dispensing or printing, and then perform vacuum brazing to obtain bright, clean welds.
AgCuNi vs. Conventional AgCu28 Brazing Advantages
| Comparison dimension | AgCuNi (-300mesh) | Traditional AgCu28 brazing alloy |
|---|---|---|
| High-Temperature Strength (300°C) | ✓ Retains 90% of its room-temperature strength | A decrease of approximately 40% |
| Corrosion resistance (salt spray/weak acid) | ✓ Significant improvement, nickel passivation | Generally, interfacial corrosion is likely to occur. |
| Wettability (on stainless steel) | ✓ Spreading area increased by 25% | Good, but requires a higher temperature. |
| Brazed joint density | ✓ Porosity < 0.5% (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. Traceable 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
Why choose TIJO’s AgCuNi welding powder?
- Vacuum atomization dedicated line + precision screening – Backed by Central South University’s powder metallurgy expertise, with excellent sphericity and flowability, and consistently reliable quality control.
- Sufficient monthly production capacity and ample in-stock inventory. – Four atomization powder‑making lines with a monthly capacity exceeding 200 tons, ensuring large‑scale, continuous production and on‑time delivery.
- Welding Process Support – Free powder and solder paste formulation testing, with support to help customers optimize their brazing temperature profiles.
- Free sample (300g–500g) – Real batch samples are provided and can be used directly for brazing tests.
- Customized Particle Size and Composition – Customization services are available
- End-to-end technical search – From powder selection to brazing defect analysis, experienced engineers provide one-on-one support.
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.
