The hafnium cathode
Supplier — the company AvecGlob — offers at affordable prices from the manufacturer cathodes from hafnium. The supplier guarantees the timely delivery of products to any address specified by the consumer.
For the production of cathodes refined hafnium is used. Metal differs plasticity and has a characteristic silvery luster, has a tightly packed hexagonal crystal structure. The operational feature of the material is high corrosion resistance, but its properties are largely influenced by the degree of zirconium impurity.
Hafnium, which is used to make cathodes, is resistant to concentrated alkalis, but reacts with oxygen, nitrogen, carbon, boron, sulfur and silicon, as well as with halogens at elevated temperatures.
Urgency of application
Because of its ability to throw electrons into the air and therefore create an electric arc, hafnium is used as an insert in the welding tips of plasma torches instead of tungsten, and as a cathode in plasma cutting plants.
It is given in the table:
|Chemical composition, %|
|Mass fraction of impurities, not more than|
|Make||Mass fraction of hafnium and zirconium, not less than||Cyr-
Note. Mass fraction of molybdenum in hafnium due to the mass of molybdenum wire, embedded in the process, should not be more than 0.1%.
Physical and mechanical properties
- Density, kg / m 3 — 13100;
- Melting point, 0 С — 2233;
- Modulus of elasticity, GPa — 195;
- Coefficient of thermal conductivity at room temperature, W / mdg — 9;
- The limit of temporary resistance, MPa — 365… 380;
- Limit of plasticity, MPa — 180… 190;
- Relative elongation at tension,% — 31… 42;
- Hardness according to Brinell, HB, not more — 131.
Features of production and application
Hafnium cathodes are obtained by the technology of pressing the metal bars cut into the size into the body of the welding tip, which is planted on cold-pressing machines. The durability of the cathode is increased by pressing over the main insert of hafnium silver insert of the appropriate diameter.
Supplier — AvekGlob Company — offers to buy hafnium cathodes, obtained by pressing. 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.