Hafnium ГФИ2

Designation

Name	The value
Designation GOST Cyrillic	ГФИ2
Designation GOST Latin	GFI2
Transliteration	GFI2
By chemical elements	GePIr2

Description

Hafnium ГФИ2 used: for the manufacture of crystalline rods (Yudenich), used for technical and research purposes (pipes, wire, sheet, foil, special techniques, electronic ceramics, special refractories, thermocouple covers, alloys, etc.); details of the electrical and electronic industry (electronic ceramics, certain types of electrolytic capacitors, filaments of light bulbs, electrodes of rectifiers, cathodes, gas discharge tubes, high-pressure x-ray and television tubes, contacts, resistors, dielectric coatings, etc.); products working in contact with aqueous coolant without the protective shell and other parts of nuclear power and absorbing elements (PEL) energy and transport reactors.

Note

At IUS 10−1998 to GOST 22517−77 hafnium brand ГФИ2 excluded from GOST 22517−77.
Hafnium high purity, free from gas impurities get iodidum way.
Hafnium has ultra-high corrosion resistance (higher than that of zirconium). It has a high resistance to action of aggressive media (hot water, steam, liquid sodium, alkali, dilute hydrochloric acid, nitric acid, any concentration of organic liquids). Hafnium has a high (Zirconia) level of thermal and radiation resistance.

Standards

Name	Code	Standards
Non-ferrous metals, including rare, and their alloys	В51	GOST 22517-77

Chemical composition

Standard	C	Mn	Cr	Si	Ni	Fe	N	Al	Ti	Mo	Ca	Zr	Mg	Hf
GOST 22517-77	≤0.01	≤0.0005	≤0.003	≤0.01	≤0.05	≤0.1	≤0.01	≤0.005	≤0.01	≤0.2	≤0.01	≤1	≤0.004	Rest

Hf is the basis.
According to GOST 22517-77, the total mass fraction of hafnium and zirconium should be ≥ 99.50%. Mass fraction of molybdenum in hafnium - due to the mass of molybdenum wire, embedded in the technological process of obtaining hafnium.

Physical characteristics

Temperature	r, kg/m³	a, 10^-6 1/°C
20	13200	59

A description of the physical symbols

Name	Description
r	Density
a	The coefficient of linear expansion