INFLUENCES OF PYROLYSIS TEMPERATURE ON STATIC MAGNETIC AND MICROWAVE ELECTROMAGNETIC PROPERTIES OF POLYCRYSTALLINE IRON FIBERS
TONG Guo-Xing
武汉理工大学国家重点实验室
Cite this article:
TONG Guo-Xing. INFLUENCES OF PYROLYSIS TEMPERATURE ON STATIC MAGNETIC AND MICROWAVE ELECTROMAGNETIC PROPERTIES OF POLYCRYSTALLINE IRON FIBERS. Acta Metall Sin, 2008, 44(7): 867-870 .
Abstract Using the high pure argon gas as carrier gas, the polycrystalline iron fibers with tunable morphology, crystal size and composition were prepared just by controlling pyrolysis temperature of Fe(CO)5. The effects of pyrolysis temperature on the static magnetic properties and microwave electromagnetic properties were studied. The results show that the static magnetic properties and microwave electromagnetic properties of polycrystalline iron fibers are strongly dependent on the pyrolysis temperature owing to the crystal sizes and compositions of polycrystalline iron fibers regularly changing with pyrolysis temperature. the polycrystalline iron fibers obtained at 500℃, with 21.6 nm crystal size and 8.26% C content have the worst soft magnetic properties and the lowest permittivity loss and permeability, however, the polycrystalline iron fibers obtained at 700℃, with 61.1 nm crystal size and 3.88% C content have the best soft magnetic properties and the biggest permittivity loss and permeability loss. The polycrystalline iron fibers with good microwave electromagnetic properties could be obtained by adjusting pyrolysis temperature to control the structures and compositions of the polycrystalline iron fibers.
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