Iron Powder Core Material Knowledge

The iron powder core is a magnetic core made of high-purity iron powder or carbonyl iron powder after being insulated, formed and coated.

The saturation magnetic induction intensity of various iron powder cores is up to 500-1300 mT, the magnetic permeability ranges from 22 to 100; it can be saturated under high magnetization field, and has good stability of AC and DC superposition; initial permeability μi has good stability with frequency; the price is the lowest among various metal soft magnetic powder cores. However, the loss is high at high frequencies.

The carbonyl iron powder is obtained by reacting CO with iron under high temperature and high pressure to form a 5 carbonyl iron oil, which is obtained by low pressure separation. It can be obtained by annealing and anti-oxidation treatment. When the temperature is 200 ° C, 200 bar, the Carbonyl synthesis reaction formula is as follows

Fe+5CO——Fe(CO)5

Iron carbonyl decomposes into Fe and CO at 300 ° C, 1 bar

Fe(CO)5——Fe+5CO

In the decomposition process, since Fe catalyzes the reaction of CO with CO2, NH3 is usually used as a shielding gas to suppress the reaction. As a result, the presence of N element is inevitable in the carbonyl iron powder. The products collected from the cyclone collector generally have an iron content of about 97%, and the contents of C and N are less than 1%. Due to the existence of impurities such as Fe2O3 and Fe3N, the surface of the iron powder also has a certain adsorption on CO and NH3 gases. These factors cause the hardness of the iron powder to be relatively large, which is usually called hard powder.

When the iron powder is reduced with H2 gas for 1 hour, the iron content will increase to about 99.0%, and the content of other elements will also be significantly reduced. This reduced carbonyl iron powder has a slightly lower hardness and is also called a soft powder. The carbonyl iron powder is very active, and after a normal period of time, automatic agglomeration occurs due to an increase in entropy. The agglomeration of iron powder increases particle size and particle bonding, which has a relatively large impact on injection molding applications.

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