info@meiqicn.com

Home > Company news > Views

Company news

The production process of carbonyl iron powder


Production and application of carbonyl iron powder

Carbonyl group is an organic functional group (-c =O-) formed by the double bond of carbon and oxygen atoms.
Carbonyl iron powder is with carbonyl iron reaction under high temperature and high pressure, oil generation 5 carbonyl iron, the low pressure resulting from the separation of iron powder, and then through the hydrogen annealing after the reduction treatment called soft powder, carbonyl iron powder is mainly refers to the soft powder, mainly used in injection molding.

The production process of carbonyl iron powder

Iron powder at 300 ℃, 1 bar under the conditions of synthesis of carbonyl iron powder is as follows:
Fe + 5CO = Fe(CO)5
Carbonyl iron powder at 300 ℃, 1 bar under the condition of decomposition for Fe and CO
Fe(CO)5 = Fe + 5CO
In the process of decomposition, because Fe has catalytic CO and CO2 reaction, NH3 is usually adopted as protective gas to suppress the reaction.
So that carbonyl iron powder is inevitable there will be in the presence of N elements, collected in the collector products generally around the iron content of 97%, among them the content of C and N is less than 1%, because of Fe2O3, the existence of impurities such as Fe3N, at the same time, the surface of the iron powder for CO and NH3 gas adsorption to a certain extent, these factors caused by iron powder hardness is larger, often referred to as hard powder.
When the iron powder is fully reduced for 1 hour with H2 gas, the iron content will be increased to about 99%, while the content of other elements will be significantly reduced.
This reduction of the carbonyl iron powder, the hardness is slightly lower, also known as the soft powder.

The difference between carbonyl iron powder and other iron powder is mainly:

1. The particle size of carbonyl iron powder is relatively small, usually below 2.5 microns, and ordinary iron powder is relatively thick, usually above 20 microns;
2. The carbonyl iron powder is pure and impurities;
3. General onion shaped carbonyl iron powder particle morphology, specific surface area is big, of course can, according to the use of carbonyl iron can also be the preparation of ultra-fine spherical, fibrous, flake, such as different shapes of carbonyl iron powder, meet different application requirements;

Production requirements and preservation of carbonyl iron powder

The carbonyl iron powder is very reactive, and the requirements of the process are very high. The temperature change of 5 carbonyl iron powder is 3 degrees, and the gas flow increases by 5%, which can significantly change the particle size and carbon content of the carbonyl iron.
Normally, after a period of time, automatic reuniting occurs when entropy increases.
The increase of particle size of the iron particles was greatly influenced by the injection molding application.

The production process of carbonyl iron powder