The tantalum screen
Supplier — the company AvecGlob — offers at affordable prices from the manufacturer tantalum screens. The supplier guarantees the timely delivery of products to any address specified by the consumer.
Technical specifications
Tantalum is silver metal, with a characteristic luster, which is distinguished by high corrosion resistance. Tantalum, long recognized for its excellent strength at high temperatures, is also one of the most corrosion-resistant metals, resistant to most acids, comparable to the resistance to glass and platinum.
Due to the strength at high temperatures and excellent corrosion resistance, tantalum screens provide reliable thermal protection, which is required by production personnel serving high-temperature heating devices. This stabilizes the temperature in the space around the furnace and improves the operation of vacuum-arc furnaces, the effectiveness of which is determined by the degree of gas adsorption.
Urgency of application
Tantalum protective screens are used in electron-beam melting furnaces and in X-ray machines. The use of tantalum screens is cheaper and no less effective than tungsten screens designed for similar purposes.
Chemical composition
The composition of the metal used for the production of tantalum screens, as impurities, includes the following elements (in thousandths of a percent)
Elements |
99.95% Ta | 99.98% Ta | 99.99% Ta |
99.995% Ta |
| Max | Max | Max | Max | |
| Al | 10 | 5 | 1 | 0.5 |
| Ca | 10 | 5 | 1 | 1 |
| Cl | 3 | 3 | 1 | 1 |
| Co | 10 | 5 | 1 | 0.5 |
| Cr | 10 | 5 | 1 | 0.5 |
| Cu | 5 | 5 | 1 | 0.5 |
| Fe | 50 | 20 | 5 | 1 |
| K | 2 | 2 | 0.4 | 0.1 |
| Li | 1 | 1 | 0.5 | 0.05 |
| Mg | 10 | 5 | 1 | 0.5 |
| Mn | 10 | 5 | 1 | 0.5 |
| Mo | 50 | 20 | 10 | 10 |
| Na | 1 | 1 | 0.4 | 0.4 |
| Nb | 300 | 100 | 100 | 50 |
| Ni | 20 | 10 | 5 | 1 |
| Pb | 5 | 5 | 1 | 1 |
| Si | 10 | 10 | 1 | 0.5 |
| Sn | 10 | 5 | 1 | 1 |
| Ti | 10 | 5 | 1 | 1 |
| V | 5 | 5 | 1 | 1 |
| W | 150 | 100 | 80 | 50 |
| Zn | 5 | 5 | 1 | 1 |
| Zr | 20 | 10 | 5 | 1 |
Physical and mechanical properties
- Density, kg / m 3 — 16400;
- Melting point, 0 С — 3017;
- Specific heat capacity, J / kggrad — 170;
- Modulus of elasticity, GPa — 185.7;
- The limit of temporary resistance, MPa — 900;
- Hardness according to Brinell, HB, not more than — 195;
- Coefficient of thermal conductivity, W / megade — 54.4;
- The coefficient of thermal expansion in the temperature range 20… 100 0 С, μm / deg — 6.5.
Assortment and application features
For the production of tantalum screens, rolling profiles, castings and sintered blanks that meet the requirements of TU 11−78, TU 95.205−78 and SU0.021 are used. 016−77. In view of the high plasticity, the initial preforms can be a sheet scrap of tantalum, which is then remelted and reshaped into products of the required dimensions.
Thermal protective screens of tantalum can not be used in installations associated with the use of hydrofluoric acid, strong alkalis, oxalic acid and fuming sulfuric acid, as well as any solution containing fluoride ions. All these substances easily destroy tantalum.
Supplier — AvekGlob Company — offers to purchase tantalum screens in a wide range of sizes and configurations. Products can be bought at a price formed on the basis of European and world standards of production. Implementation is possible in bulk and retail, for regular customers, a flexible system of discounts operates.