Tantalum
Material
R05200, R05400, Ta1, Ta2
Purity: 3N, 3N5, 4N
Overview
Tantalum is ductile, superconductive, has high-temperature strength, low thermal expansion, and high capacitance. It is tough, durable, and ductile, tantalum also offers good workability and weldability. In addition, it possesses the ability to grow uniform and stable oxides with good dielectric properties. Tantalum has excellent resistance to corrosive attack by acids and liquid metals.
Tantalum and niobium co-exist, the hardness is second only to tungsten, rhenium, and osmium among the metal elements. It is easily hydrogenated, it has the highest corrosion resistance and has a very good affinity with human tissues. Tantalum capillary is often used to manufacture medical devices and special instruments. Its special manufacturing process is quite different from other metal capillary tubes.
Application
Tantalum capillary tube can be often used as the filament lead tube of the cathode insulator in an X-ray tube. And it is used to make medical devices, special instruments and etc.
Manufacture and repair of chemical process equipment and heat exchangers.
Rupture discs
Capacitors
Surgical implants
Medical Devices
Ink jet nozzles
Chemical composition
| Material | C | H | O | N | Nb | Fe |
|---|---|---|---|---|---|---|
| R05200 | ≤0.010 | ≤0.0015 | ≤0.015 | ≤0.010 | ≤0.10 | ≤0.010 |
| R05400 | ≤0.010 | ≤0.0015 | ≤0.030 | ≤0.010 | ≤0.10 | ≤0.010 |
| Ta1 | ≤0.010 | ≤0.0015 | ≤0.015 | ≤0.005 | ≤0.05 | ≤0.005 |
| Ta2 | ≤0.020 | ≤0.0050 | ≤0.030 | ≤0.025 | ≤0.10 | ≤0.030 |
| Material | Ti | W | Mo | Si | Ni | Ta |
|---|---|---|---|---|---|---|
| R05200 | ≤0.010 | ≤0.050 | ≤0.020 | ≤0.005 | ≤0.010 | Balance |
| R05400 | ≤0.010 | ≤0.050 | ≤0.020 | ≤0.005 | ≤0.010 | Balance |
| Ta1 | ≤0.002 | ≤0.010 | ≤0.010 | ≤0.005 | ≤0.002 | Balance |
| Ta2 | ≤0.005 | ≤0.010 | ≤0.030 | ≤0.020 | ≤0.005 | Balance |
Physical property
Density：0.6 lbs/in³, 16.70 g/cm³
Melting range：5425°F, 2996℃
Specifific Heat: BTU/lb-°F (J/g-°C) At 212°F (100 °C): 0.0336 (0.141)
Thermal Conductivity: BTU-in/hr-ft²-°F (W/m•K) 68-212 °F (20-100 °C): 384 (55.3)
Mean Coeffificient of Thermal Expansion: µin/in-°F (µm/m-°C) 68-932 °F (20-500 °C): 3.60 (6.48)
Modulus of Elasticity: KSI(MPa) 27 x 10³ (186 x 10³) in tension
Mechanical property
| Material | Tensile strength ksi (MPa) min. |
Yield strength at 0.2 offset ksi (MPa) min. |
Elongation at fracture min. |
|---|---|---|---|
| R05200 | 30 (207) | 20 (138) | 25% |
| R05400 | 30 (207) | 20 (138) | 25% |
Microstructure
The main enhancement of the alloy is the γ′-Ni₃(Al、Ti), which precipitates into different square particles in the grain, which is also visible in the grain boundary. The carbide is precipitated in a discontinuous strand in the grain boundary.
Corrosion resistance
Refer to NACE (National Association of Corrosion Engineers) for recommendations
Tantalum is famous for its resistance to corrosion by acids; in fact, below 150°C, tantalum is almost completely immune to cor-rosion by aqua regia. Due to its resistance to attack by body fluids, tantalum provides an excellent material for medical devices.Due to its much longer service life and maintenance-free durability, tantalum has proven to be your most cost-effective solutionfor corrosion protection in pharmaceutical and chemical processing applications. Another major use of tantalum is for electron-ic components and due to its absorption properties, it is an excellent getter of residual gasses in evacuation tubes.
Workability
Tantalum can generally be worked and fabricated using conventional tool and techniques. However annealed tantalum is ‘sticky’ and has atendency to seize, tear and gall similar to lead, copper and stainless steel. Forming, bending, stamping or deep drawing processes are usuallydone cold. Heavy sections can be heated for forging to approximately 800°F.
Cleaning
Cleaning and degreasing presents no special problems and conventional methods and materials may be used, although hot caustics must be avoided. Tantalum parts must never be cleaned by hydrogen firing.
Delivery condition: Annealed or Unannealed
Heat treatment
Tantalum is non hardenable by heat treatment.
Tantalum exhibits high reactivity towards interstitial elements like Hydrogen, Nitrogen and Oxygen. Also it may react with Hydrocarbons. Its recrystallization temperature varies between 900 °C and 1450 °C. Vacuum and dry inert gases are most suitable as heat treatment atmospheres. The duration of the heat treatment may depend on the equipment, the process and the experience with the material. Lubricants should be completely removed prior to the heat treatment. If not, they may react with the Tantalum and cause embrittlement of the material.
Tube surface
Under atmospheric conditions Tantalum is covered by a stable, tight oxide layer. Although Tantalum is a reactive element this layer is the reason for the high corrosion resistance and the high bio-compatibility.
Appearance: Observed under a microscope, the inner and outer surfaces of the tube show a uniform metallic luster, without oxidation, hydrogenation, discoloration, scratches, deformation, burrs, etc.
Product forms
Capillary tube
- ◎ OD 0.30 ~ 3.0 mm
- ◎ WT 0.05 ~ 0.5 mm
Precision seamless tube
- ◎ OD 3.0 ~ 89 mm
- ◎ WT 0.10 ~ 10.0 mm
Service
- ◎ Precision cutting
- ◎ Tube surface treatment, like ID surface super mirror polishing, best level could reach Ra0.0015um
- ◎ Tube deep processing, like coiling, bending, end forming, body forming, laser processing, various needles processing, built to drawing and sample, etc.