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Ti37.5ZrCuNi titanium–zirconium–copper–nickel brazing filler metal · Active brazing alloy
High-Temperature Active Brazing · Specifically for Titanium Alloys and Ceramics Powder / Paste
Process Advantages
High-strength connection
Brazed joints exhibit high strength and excellent fatigue resistance, making them well-suited for high‑load titanium alloy/ceramic components.
High-temperature resistant · Antioxidant
It exhibits excellent high-temperature resistance, with superior oxidation resistance at elevated temperatures compared to conventional silver-based brazing alloys, thereby meeting the demands of high-temperature operating conditions.
Excellent wettability
It exhibits excellent wettability on difficult-to-bond materials such as titanium alloys and alumina/zirconia ceramics, resulting in dense brazed joints with high gas tightness.
Green Economy
Cadmium- and silver-free, with controllable costs, compliant with RoHS and high-end industrial environmental standards.
Product Real Shots & Microscopic Morphology
Powder SEM (-200 mesh)
Spherical or near-spherical particles with good flowability and uniform composition.
Real-life photo of powdered brazing filler metal
Gray powder, packaged in vacuum-sealed aluminum foil bags or plastic canisters.
Real-life photo of paste-type solder alloy
Syringe/plastic can packaging, ready-to-use, with adjustable viscosity.
Ti37.5ZrCuNi active brazing alloy
Titanium–zirconium–copper–nickel brazing filler metal is an active brazing alloy specially developed for joining titanium alloys, high‑temperature alloys, and ceramics to metals. Among these, Ti37.5ZrCuNi exhibits a moderate melting point and excellent high‑temperature performance. The Ti and Zr elements in the alloy possess exceptionally high chemical reactivity, enabling effective wetting of the oxide layer on titanium alloy surfaces and the surface of ceramics, thereby forming strong chemical bonds. This results in brazed joints with high strength and superior resistance to thermal shock. The product is manufactured using non‑vacuum atomized powder, with tightly controlled oxygen content and excellent flowability, allowing it to be formulated into both powder and paste forms. It is compatible with vacuum brazing, argon‑shielded brazing, and automated dispensing processes. Typical applications include titanium alloy engine blades and casings, ceramic‑to‑metal transition joints, nuclear reactor cooling pipelines, and X‑ray tube seals.
Chemical Composition (wt%, Preferred Grade)
| Grade | Ti | Zr | Cu | Ni | Solidus (°C) | Liquidus temperature (°C) | Brazing temperature (°C) |
|---|---|---|---|---|---|---|---|
| Ti37.5ZrCuNi | 37.5 | 37.5 | 15 | 10 | 805 | 815 | 850-950 |
| Ti40ZrCuNi | 40 | 20 | 20 | 20 | 750 | 820 | — |
| BIIP16 | 57 | 13 | 21 | 9 | 910 | 920 | — |
* The above values are for reference only; the Certificate of Analysis (COA) shall prevail. Our flagship product is Ti37.5ZrCuNi, and custom formulations are available.
Powder Particle Size Specifications & Physical Properties
| Particle size specification | Corresponding mesh count | D50 range (μm) | Loose packing density (g/cm³) | Flowability (s/50g) | Recommended Process |
|---|---|---|---|---|---|
| -100 mesh | ≤150μm | 80-120 | ≥3.2 | ≤28 | Coarse powder preset, paste raw material |
| -200 mesh | ≤75μm | 40-65 | ≥3.4 | ≤26 | Paste raw materials, flame brazing, automatic powder feeding |
| -300 mesh | ≤48μm | 25-40 | ≥3.5 | ≤25 | Fine paste, spray coating, vacuum brazing powder |
* The powdered brazing filler metal exhibits excellent fluidity and can be customized as needed; the paste‑type product offers adjustable viscosity.
Creamy formulation
| Product form | Alloy powder content (wt%) | Binder (wt%) | Viscosity (Pa·s) | Recommended Process |
|---|---|---|---|---|
| Ti37.5ZrCuNi solder paste | 80-90 | Margin | 30-200 | Automatic dispensing, screen printing, manual application |
* Viscosity can be customized to suit the customer’s dispensing equipment and process; the carrier evaporates completely, leaving minimal residue.
| Base material combination | Recommended Brazing Temperature (°C) | Protective atmosphere/vacuum level | Joint strength | Features |
|---|---|---|---|---|
| Titanium alloy - TC4 | 880-930 | Vacuum ≤ 5×10⁻³ Pa | Excellent | Excellent wettability, no brittle phases. |
| Titanium alloy–stainless steel | 900-950 | Vacuum or argon gas | Excellent | Brazing time must be controlled to ensure a uniform diffusion layer. |
| Alumina ceramic–oxygen-free copper | 890-940 | Vacuum | Excellent | Surface pre-metallization of ceramics can enhance wettability. |
| Silicon Carbide Ceramic–Titanium Alloy | 920-950 | Vacuum | Excellent | The active elements Ti/Zr promote chemical bonding. |
Powdered vs. Paste Form: Choice of Form
| Form | Advantages | Applicable Process |
|---|---|---|
| Powdered | Uniform composition, excellent flowability, precise metering, and stable storage. | Vacuum brazing with pre-placed powder, powder spraying, laser cladding, and automated powder feeding. |
| Paste-like | Ready-to-use, with precise dotting/printing that won’t run, simplifying application. | Automatic dispensing, screen printing, manual repair, coating of complex shapes |
* Titanium-based active brazing alloys are sensitive to oxygen, so brazing must be carried out under high vacuum or in an ultra‑high‑purity argon atmosphere.
Compared with traditional silver-based brazing alloys
| Comparison item | Ti37.5ZrCuNi | Silver-based brazing alloys (e.g., AgCuTi) |
|---|---|---|
| Operating Temperature (Long-Term) | High-temperature resistant | ≤500℃ |
| Joint strength | Excellent | Good |
| Wetting of titanium alloys | ✓ Excellent | Good |
| On ceramic wetting | ✓ Good | Pre-metallization required |
| Cost | Silver-free, lower | High silver content |
Ti37.5ZrCuNi is the material of choice for high-temperature titanium alloys and ceramic brazing, offering a cost-performance ratio far superior to that of silver-based active brazing fillers.
Typical application areas
Aerospace
Vacuum brazing of titanium alloy engine blades/casings, hot-end components, and missile casings.
Nuclear energy equipment
Nuclear reactor cooling pipelines, radiation-resistant structural joints, and control rod drive mechanisms
Electronic packaging
Ceramic–metal seals (CF/Kovar/Ti), high-power device heat‑sink substrates
Medical device
Titanium implants, orthopedic instruments, brazing of corrosion-resistant devices
Industrial manufacturing
High-temperature furnace fixtures, vacuum equipment sealing connections, thermocouple protection tubes
Precision instruments
X-ray tube rotating anode, vacuum feedthrough, sensor housing
End-to-end testing capability
Each batch of titanium‑zirconium‑copper‑nickel brazing filler metal is tested for major element content, oxygen content, particle size distribution, and fluidity. A Certificate of Analysis (COA) is provided.
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 per drum
Solder paste packaging
Syringes (10 cc/30 cc/50 cc) or plastic containers (100 g/500 g/1 kg)
Refrigerate; shelf life: 6 months.
Export packaging
Export orders are packed in wooden crates or palletized and reinforced to protect against moisture and impact.
Compatible with sea freight, air freight, and international express delivery.
Delivery time
Standard particle size in stock; ships within 3–7 days after order confirmation.
Solder paste customization or particle size fine-tuning: 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)
Free sample
Free samples are provided for process validation.
Small-batch samples; bulk supply upon quality confirmation.
Customized Services
Particle size customization, solder paste viscosity adjustment
Meets special operating conditions and equipment requirements
Technical Support
Providing brazing process parameters and solder paste application guidelines.
Assist in resolving issues such as brazing cracks in titanium alloys and poor wetting of ceramics.
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.
