Niobium Tin Alloy

1.Superconducting performance is excellent.

Nb₃Sn is one of the A15 type superconducting materials with the highest critical magnetic field known to date. The upper critical magnetic field exceeds 20 teslas, far exceeding pure niobium (~0.2T). This means it can still operate stably in a strong magnetic field environment, which is something ordinary metal alloys cannot achieve - because only the A15 crystal structure can achieve such a high magnetic flux pinning capacity.

 

2. Non-magnetic, Corrosion-resistant

The magnetic susceptibility of the niobium matrix is only at the order of 10⁻⁶, and it is almost unaffected by external magnetic fields; at the same time, it does not react with inorganic acids or bases, does not dissolve in aqua regia, and only dissolves in hydrofluoric acid. Our melting process is carried out under the protection of high-purity argon gas, with the oxygen content controlled below 50 ppm, which further enhances the corrosion resistance.

 

3. Excellent stability under high-temperature processing

The melting point of niobium is as high as 2477°C, and the Nb₃Sn phase remains structurally stable below 670°C. Compared with other superconducting materials (such as NbTi which begins to decompose above 500°C), our alloy can withstand higher heat treatment temperatures, providing customers with a wider process window for subsequent processes such as winding and reaction diffusion.

1.The magnetic body of the magnetic resonance imaging (MRI) equipment

This is the most mature commercial application of Nb₃Sn. The core superconducting magnetic bodies used in MRI machines with a field strength of 3.0T and above in hospitals generally adopt Nb₃Sn coils. Because only Nb₃Sn can generate and maintain a strong magnetic field of more than 3T at the liquid helium temperature of 4.2K, NbTi can only achieve approximately 1.5T. Our alloy has high purity and uniform composition, which can effectively reduce the risk of magnet superconductivity failure and ensure the long-term stable operation of hospital equipment.

 

2. Superconducting Cavities and Magnets for Particle Accelerators

In research facilities such as the Large Hadron Collider (LHC), Nb₃Sn is used to manufacture high-field superconducting magnets and radio frequency cavities. Our products undergo strict control of the precipitated phases to ensure the full formation of the A15 phase, meeting the performance standards for research-grade applications.

 

3. Magnetic Levitation Train Traction System

Superconducting magnetic levitation achieves levitation and propulsion through the strong magnetic field generated by Nb₃Sn. Our alloy rods can be directly used to wind the traction coils, helping customers implement high-load, low-energy consumption rail transit solutions.

The customization advantage of China Super Tech Co., Ltd. lies in the fact that we do not simply cut according to dimensions; instead, we get involved in the design from the melting stage.

 

1.Component customization - Precise formulation control down to the ppm level

Note: The Sn ratio can be fine-tuned within the range of 3:1. It can also be modified by adding a small amount of Ti or Ta to meet the performance requirements in different magnetic field environments. We have a vacuum self-dissolving arc melting (VIM) dual-refining equipment that can control the component fluctuations at the ppm level. Ordinary suppliers are limited by the equipment precision and find it difficult to achieve this level.

 

2. Form Customization - Complete process from billet to finished product in one step

Bar materials, wire materials, strip materials, and ingot blanks can all be provided. The dimensions are strictly processed according to the drawings. We have our own hot rolling and cold drawing production lines. From the ingot blank to the finished product, the entire process is completed on the same production line, avoiding cross-contamination caused by external cooperation transfer in the middle. This is crucial for maintaining the purity of superconducting materials.

 

3. Performance Customization - Reverse optimization of processes based on end-user requirements

The grain size and heat treatment regime can be adjusted according to actual needs. Our engineering team has participated in actual projects such as MRI magnets, and can reverse-engineer the optimal process parameters based on your end application scenario, rather than requiring you to adapt to a general solution.

 

4. Delivery guarantee - Quick response even for small quantities

For small batches, the delivery time is 5 working days; for large batches, it is 15 working days. We ensure the delivery time by using the rolling production scheduling based on finished product inventory and work-in-progress materials. We do not rely on external outsourcing, so even for small orders, there is no need to wait for the production scheduling cycle.

Parameter	Specification
Product Name	Niobium Tin Alloy (Nb₃Sn)
Chemical Composition	Niobium (Nb) + Tin (Sn)
Typical Nb Content	70–75 wt%
Typical Sn Content	25–30 wt%
Alloy Phase	Nb₃Sn Intermetallic Compound
Density	8.4–8.7 g/cm³
Melting Point	Approx. 2,100–2,300°C
Electrical Property	Superconducting below critical temperature
Critical Temperature (Tc)	18 K (−255°C)
Critical Magnetic Field	Up to 30 T
Tensile Strength	150–300 MPa (varies by form)
Available Forms	Wire, Rod, Tube, Ribbon, Target, Custom Parts
Surface Finish	As-drawn, Polished, Cleaned
Purity	≥ 99.9% (customizable)
Standard Diameter (Wire)	0.1–3.0 mm
Standard Diameter (Rod)	2–50 mm
Length	Customizable

 

China Super Tech Co., Ltd. - Specializing in rare metal superconducting materials, making cutting-edge performance within reach.

 

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