· CAS:7440-58-6

· Molecular Formula: Hf

· Purity:99%

· Specification:- 100 mesh / - 200 mesh 

· EINECS No.:231-166-4

· Hazardous Class:Class /

UN No.:/

Package Class:Vacuum Bag or with argon protection sealed

Hafnium Metal (Hf)-Powder

Characteristic

Hafnium is a metallic element with atomic number 72. Hafnium is a silver-gray metal with metallic luster; there are two variants of metallic hafnium: α-hafnium is a hexagonal close-packed variant (1750°C), and its transition temperature is higher than that of zirconium. Hafnium metal has allotropic variants at high temperature. Hafnium metal has a high neutron absorption cross section. Hafnium has good corrosion resistance and is not easily eroded by general acid-base aqueous solutions; it is easily soluble in hydrofluoric acid to form fluorine complexes. At high temperature, hafnium can also be directly combined with oxygen, nitrogen and other gases to form oxides and nitrides.

Phase at STP： solid

Melting point： 2500 K (2227 °C, 4040 °F)

Boiling point： 4875 K (4602 °C, 8315 °F)

Density (near r.t.)： 13.31 g/cm3

when liquid (at m.p.)： 9.45 g/cm3

Chemical Composition 

Application

Pure hafnium has plasticity, easy processing, high temperature resistance and corrosion resistance, and is an important material in the atomic energy industry. Hafnium has a large thermal neutron capture cross section and is an ideal neutron absorber, which can be used as a control rod and protective device for atomic reactors. Hafnium powder can be used as a propeller for rockets.