General Characteristics

Hafnium, a silvery metal, is strong and heat resistant, very malleable in its pure form, and can be rolled into thin sheets and even foils up to a few microns thick. The finished sheet should be smooth and clean without cracks or dirt. The samples are allowed irregularities within the dimensions not exceeding the boundaries of the size deviations stipulated by GOST. Minor defects, risks and changes in color stipulated by the standard are possible. Color fluctuations depend on terms and conditions of storage.

Production

Sheets vary in size over a wide range from 5 mm in thickness, 500-800 mm - in width and about 500-2000 mm - in length. For larger sizes, length deviations of up to 20 mm are permissible. Sheets may be of measured and unmeasured length, which is a multiple of 100 and not a multiple of 100. If necessary, hafnium is alloyed with special additives to obtain required properties - tantalum with boron, cobalt, silicon and tungsten. Such alloyed plate is used for the production of high-temperature resistant parts of rocket equipment and nuclear boilers.

Applications

Heat-resistant and high strength sheets are required in the chemical industry, nuclear power and mechanical engineering. Hafnium sheets are used in instrument engineering and electrical engineering for producing cathodes and anodes for electric vacuum equipment. Heat resistance and low electron yield (3.53 eV - less than niobium, molybdenum and tungsten) allow using hafnium not only in radio equipment, but also for cathodes of electron-beam guns. High resistance allows to produce a variety of electric heaters and elements of thermocouples from hafnium tape thickness of 5-20 microns.

Good price

Evek GmbH has a wide range of rare and refractory metal products in stock. We supply hafnium sheets at the best prices. Technical documentation on products includes data on chemical composition, marginal percentage of impurities; mechanical properties of products; quality of the surface. The results of ultrasonic testing are enclosed. Lead time is minimal. For wholesale customers there are preferential discounts.