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AgCuInTi silver-copper-indium-titanium active brazing alloy
Available in three forms: powder, paste, and foil. Low-Temperature Active Brazing · Ceramic/Metal Joining · Specialized for Diamond Tools
Core Advantages of AgCuInTi Active Solder Alloy
Low-temperature active brazing
Brazing temperature: 650–800°C, lower than that of AgCuTi4.5, thereby minimizing the heat-affected zone in the base material; meets the requirements for stepwise brazing and repair welding.
The active role of titanium
The Ti element breaks down the oxide film on the substrate surface and exhibits excellent wettability toward ceramics, graphite, and diamond, eliminating the need for prior metallization.
Indium element–enhanced performance
In elements significantly enhance fluidity and wettability, strengthen the Ag matrix through solid-solution strengthening, and lower the melting point without compromising joint strength.
Flexible configuration across three forms
Available in powder, paste, and foil forms, it is compatible with a variety of soldering techniques, including vacuum brazing, dispensing, screen printing, and pre‑placed solder.
Product Real-World Photos & Microscopic Morphology
Powder SEM (-300 mesh)
Spherical or near-spherical particles with uniform particle size and excellent flowability.
Real-life photos of powder/cream products
Light coffee-colored powder, packaged in vacuum-sealed aluminum foil bags; paste-like formulation in a syringe.
Ceramic/Metal Brazed Components
Al₂O₃–oxygen-free copper brazed joint, diamond tools
AgCuInTi silver-copper-indium-titanium active brazing alloy
AgCuInTi is a silver-based active brazing alloy, classified as a low-temperature active brazing material. By incorporating indium (In) and titanium (Ti), its overall performance has been optimized compared to conventional silver–copper brazing alloys. The addition of titanium enables the alloy to form chemical metallurgical bonds with non-metallic materials such as ceramics (alumina Al₂O₃, aluminum nitride AlN, silicon nitride Si₃N₄), graphite, and diamond, eliminating the need for prior metallization of the ceramic substrate. Indium significantly enhances the alloy’s fluidity and wettability while lowering its melting point without compromising mechanical strength. The product is available in three forms—powder (-200 mesh, -300 mesh), ready-to-use paste (with an organic binder), and foil—suitable for a variety of processes including vacuum brazing, protective-atmosphere brazing, dispensing, and screen printing. It complies with GB/T 10046 “Silver Brazing Alloys” and JB/T 7520 “Silver–Copper–Titanium Brazing Alloys.” It finds extensive applications in aerospace, ceramic–metal packaging, diamond tools, electronics and electrical engineering, and joining dissimilar metals. Joint strengths range from 300 to 400 MPa, and the brazed joints can withstand temperatures exceeding 600°C.
Applicable Standards
| Standard system | Corresponding standard |
|---|---|
| China GB/T | GB/T 10046 “Silver Brazing Alloy” |
| China JB/T | JB/T 7520 “Silver-Copper-Titanium Brazing Alloy” |
| Grade | AgCuInTi |
* Complies with the requirements of GB/T 10046 and JB/T 7520. The specific composition shall be subject to the batch inspection report.
Chemical Composition (wt%)
Powder & Solder Paste
| Element | Content range |
|---|---|
| Ag | 42.6-44.6 |
| Cu | Margin (Bal.) |
| In | 23.3-25.3 |
| Ti | 2.0-4.0 |
| O ≤ | 0.05 |
* The solder paste contains 80–90% alloy powder, with the remainder being binder.
Foil sheet
| Element | Content range |
|---|---|
| Ag | 58.2-60.2 |
| Cu | 22.0-24.0 |
| In | 13.0-15.0 |
| Ti | 2.0-5.0 |
* The foil and powder compositions are slightly different to accommodate various brazing processes.
Physical Properties & Brazing Temperature
| Product form | Solidus (°C) | Liquidus temperature (°C) | Recommended Brazing Temperature (°C) | Recommended vacuum level |
|---|---|---|---|---|
| Powder / Solder Paste | 540 | 650 | 650-800 | ≥1.0×10⁻² Pa |
| Foil sheet | 610 | 710 | 740-780 | ≥1.0×10⁻² Pa |
* The solid–liquid phase temperature for powders and solder pastes is 540–650°C, while for foil it is 610–710°C. The loose packing density of the powder is ≥3.5 g/cm³, and the oxygen content is ≤500 ppm (0.05%).
Particle Size Specifications & Morphology Selection Guide
| Specification/Format | Granularity/Features | Recommended Process | Typical Applications |
|---|---|---|---|
| -200 mesh | ≤74μm | Vacuum brazing, powder pre‑placement | General-purpose powder specification, suitable for most brazing applications. |
| -300 mesh | ≤48μm | Precision brazing, paste formulation | Fine-gap joints, brazing of precision components, solder paste raw materials |
| Paste-like | 80–90% alloy powder + binder | Dispensing, screen printing, manual coating | Complex-shaped workpieces, automated welding, mass production |
| Foil sheet | 0.05-0.1mm | Vacuum brazing, furnace brazing | Pre‑placed solder, face‑to‑face bonding, mass production |
* Powder products are primarily offered in 200-mesh and 300-mesh grades; pastes and foil sheets can be customized to meet customer‑specific size and viscosity requirements.
Brazing Process Reference
| Brazing method | Recommended vacuum level | Brazing temperature (°C) | Holding time | Applicable form |
|---|---|---|---|---|
| Vacuum brazing | ≥1.0×10⁻² Pa | 650-800 | 10-30 min | Powder/Paste/Foil |
| Protective-atmosphere brazing | High-purity argon gas | 650-800 | 10-30 min | Powder/Paste |
* Prior to brazing, the base material surface must be thoroughly cleaned to remove oil and oxide scale. In ceramic–metal brazing, pre‑metallization of the ceramic is not required. Ag–Cu–In–Ti brazing filler metal can achieve vacuum‑activated joining of ceramics to metals at approximately 750°C.
Typical application areas
Aerospace
Engine components, heat exchangers, high-temperature structural parts, high-strength and high-temperature resistant
Ceramic-Metal Bonding
Al₂O₃/Cu, AlN/Kovar: Ti breaks the oxide film, eliminating the need for prior metallization.
Diamond tools
PDC/PCD/diamond brazed to metal, with excellent wettability and strong bonding strength.
Electronics and Electrical Engineering
Semiconductor packaging, vacuum device sealing, electron vacuum devices
Refrigeration industry
Compressor and condenser piping connections, with low-temperature brazing to minimize thermal impact.
Cemented carbide
Vacuum brazing of YG16 to carbon steel yields joints with high strength and excellent interfacial bonding.
Dissimilar metal joining
Welding of ferrous and non-ferrous metals exhibits good fluidity and wettability.
Energy equipment
Solar thermal collector panels, nuclear energy components—high-temperature resistant and thermally shock‑resistant.
AgCuInTi vs. related active brazing alloys
| Comparison item | AgCuInTi (this product) | AgCuTi4.5 |
|---|---|---|
| Active element | Ti 2.0-4.0% | Ti 4.5% |
| Depressant element | In 23.3-25.3% | None |
| Solidus (°C) | 540 | ≈780 |
| Brazing temperature (°C) | 650-800 | 900-960 |
| Liquidity | Excellent (In improvement) | Good |
| Applicable Scenarios | Low-temperature active brazing, stepwise brazing | High-Temperature Active Brazing |
AgCuInTi exhibits a lower operating temperature than AgCuTi4.5, meeting the requirements for staged brazing and repair welding. The incorporation of In atoms into the Ag matrix provides solid-solution strengthening, thereby enhancing joint strength.
Process Tips and Component Selection
| Form | Applicable Scenarios | Key Tips |
|---|---|---|
| Powder | Pre-set powder, automatic powder feeding | Vacuum/protective-atmosphere brazing with excellent fluidity. |
| Paste-like | Dispensing, printing, manual coating | Ready to use out of the box, with precise control over the amount of solder. |
| Foil sheet | Pre‑placed solder and large‑area bonding | Uniform thickness, suitable for mass production. |
* During ceramic–metal brazing, titanium (Ti) atoms enrich at the ceramic interface, forming a reaction layer that facilitates chemical metallurgical bonding.
End-to-end testing capability
Each batch of AgCuInTi powder and solder paste is tested for major elements (Ag, Cu, In, Ti), oxygen content, particle size distribution, flowability, and loose/compacted density. Additionally, brazed joints are periodically fabricated to evaluate shear strength and microstructure. COA reports are provided, ensuring compliance with GB/T 10046 and JB/T 7520 standards.
Packaging & Delivery
Powder packaging
Double-layer aluminum foil bag, vacuum-sealed + iron drum/plastic drum
Specifications: 1 kg, 5 kg, 10 kg, 20 kg per drum
Solder paste/foil packaging
Solder paste: syringes (10 cc/30 cc/50 cc) or plastic jars
Foil: in roll or sheet form, cut to customer specifications.
Delivery time
-200 mesh / -300 mesh in stock; ships within 3–7 days after order confirmation.
Paste/foil customization: 7–15 days
Batch Traceability
Bulk product samples are retained, and COA reports are provided with the shipment.
MSDS available.
Free sample
Provide samples
For verification of ceramic/metal brazing processes
Technical Support
Provide guidance
Assist customers in resolving various issues that arise during the production process.
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.
