Fortu Tech specializes in manufacturing RRR Niobium (RRR>300 Niobium ).
| RRR Niobium Product | ||
| RRR Niobium Foil | RRR Niobium Wire | RRR Niobium Sheet |
| RRR Niobium Rod | RRR Niobium Targets | RRR Niobium Tube |
| RRR Niobium Pellet | RRR Niobium Fastener | RRR Niobium Ingot |
In order to produce high purity niobium, It is generally to try to turn Nb2O5 to rough niobium first, and then further purify the niobium by electron beam melting. Generally speaking, the volatile elements (Al, Fe, alkali metals, etc.) in niobium are easy to be removed in the process of electron beam melting, but the non-volatile elements (such as Tantalum, Tungsten) and gap elements (Carbon, Nitrogen, Hydrogen, Oxygen) are not easy to be removed.
Therefore, a lot of research work has been carried out around the removal of Ta, W, Mo and C, N, H, O. There’re a lot of effective methods have been successfully developed.
The increase of rolling passes leads to the decrease of grain size and the increase of grain boundary area, which may affect the superconductivity and RRR value of niobium material.
| RRR Superconducting Grade Pure Niobium R04220 Type 5 | ||||||||||||
| Element | C | N | O | H | Zr | Ta | Fe | Si | W | Ni | Ti | Al |
| Content Maximum % | 0.003 | 0.003 | 0.004 | 0.005 | 0.01 | 0.1 | 0.005 | 0.005 | 0.007 | 0.003 | 0.005 | 0.005 |
If you have inquiry or want to discuss your design with us, please write email to us.
We will reply your email within 24 hours.
| Annealed condition, 90% min. recrystallized | ||
| Ultimate Tensile Strength | Yield Strength (0.2% offset) | Elongation |
| >14000 psi | >7200 psi | >30% |
| >95 MPa | >50 MPa | >30% |
Ingots forging -- -- billet cutting -----billet surface machining-----blank pickling -- -- -- -- removing stress annealing -- -- -- pickling ------rolling -- -- --cutting sheet-----polishing ---Pickling ---- annealing ---- shearing ---- polishing ---- pickling
Forging method: Squaring in the radial direction, Pulling out in axial length, falling round
Acid liquid: hydrofolic acid: nitric acid: sulfuric acid =1:3:3
The key parameter of superconducting niobium bar for superconducting accelerators is the RRR value (the residual resistivity of the material at 4.2K). It is generally required to be greater than 250.
The higher the RRR value, the better the superconducting performance of the bar. The main factor affecting the superconducting properties of superconducting RRR niobium rods in processing is the temperature rise from ingot to finished product.
The faster the temperature rise is, the more serious the attenuation of RRR value is. Therefore, processing method is crucial for the production of superconducting RRR niobium rods for superconducting accelerators.
Superconducting RRR niobium tube has a high requirement for residual resistivity (RRR). Meanwhile, because superconducting RRR niobium tube is mostly used for connecting tube of accelerators and other devices, specifications of RRR niobium tube are different and length of RRR niobium tube is short.
In order to ensure the residual resistivity of superconducting niobium tube, we should reduce the pollution of carbon, hydrogen and oxygen as much as possible during processing.
| Materials | Properties | Application |
| Pure Nb | Corrosion resistance | Electrolytic electrode |
| RRR Nb | Superconductivity | Superconducting microwave resonance accelerator, cavity |
| NbTi alloys | Superconductivity,High strength, Excellent processing property | Particle accelerators, Magnetic levitation trains, CT diagnostic devices, Aircraft rivets |
| Nb3Sn | Superconductivity | Superconducting magnetic television, Nuclear magnetic resonance devices |
| NbZr alloys | Heat resistance, Chemical stability | High voltage Na tube Sleeve |
| NbTa alloys | Corrosion resistance | Chemical device |
| NbW alloys | Excellent high temperature strength | Aeroengine |
| NbHfTi alloys | Machining type, Strong height | Aviation, spacecraft engines |
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Tel: +86 21 56656030
Email: info@fortu-tech.com
