Circle, rod hafnium GFI-1
Hafnium is a silvery metal, heat-resistant and exceptionally durable. In pure form it is characterized by high ductility and can be rolled into a fine wire of a few microns thick.
The metal hafnium is extracted from zirconium ores after several stages of processing. Hafnium circle is obtained from restored of hafnium metal by powder metallurgy using a special electron beam or vacuum arc or plasma melting. A circle — prefabricated cylindrical shape is further rolled to the thinnest wire. The finished circle should be clean and smooth without cracks or impurities. Acceptable shrinkage and irregularities not to exceed the size of the border specified by standard deviations. To break the circle must remain intact and does not contain extraneous inclusions and voids. To obtain the necessary properties of Hf alloyed special additives (boron, silicon) or the addition of tantalum, tungsten, cobalt.
Hafnium wire GFI-1
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In radio electronics and television technology hafnium wire is used for the production of cathodes, grids, vacuum devices and microwave generators. Such wire is often used as a high resistance wire for temperature compensation in the production of thermocouples. Heat resistance and low work function of electrons (3,53 eV — less than that of molybdenum, niobium, tungsten) allow the use of Hf not only in x-ray technology, but the cathodes of the electron gun. It produces electrodes for welding in argon, the cathode for welding of low carbon steel in the atmosphere at2, where the resistance of the hafnium electrode is almost 4 times higher than tungsten. For the production of oxygen electrodes-flame or air plasma cutting of metals is hafnium, alloyed with 25% tantalum. Such electrodes are much more durable than pure hafnium. In electroforming of the hafnium wire is produced the electrodes of the EDM machines performing a controlled decomposition of compounds by galvanic current. This wire and mesh is an important part of the vacuum devices. Hafnium anti-corrosion coating also is applied with a wire in a vacuum.
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