the introduction of carbony iron powder
The carbony iron powder is produced through the reaction of CO and iron under high temperature and high pressure to form 5-carbonyl iron oil, and the product is obtained through low pressure separation.it can be package through annealing anti-oxidation treatment. When the temperature 200℃ , in 200bar condition,the carbonyl synthesis equation is as below:
Fe+5CO =Fe(CO)5
Carbonyl iron at 300 ℃, 1 bar under the condition of decomposition for Fe and CO
Fe(CO)5= Fe+5CO
In decomposition process, because Fe have a catalysis CO and CO2 reaction work, usually, it use NH3 as protect gas to control this reaction.So, there have N element existance in carbonyl iron powder. The average iron content of products collected by cyclone collector is about 97%, amont of the C and N content are less than 1%. Because of Fe2O3, Fe3N and etc impurity existance,at the same time, the surface of iron powder will have a certain adsorption to CO and NH3 gas, these factors is caused that the hardness of iron powder have rather big, generally called by hardness powder.
Using H2 to reduction iron powder in 1 hours, the content of iron will increase to around 99.0% , meanwhile, the ocntent of other elements will abviouly decrease.The hardness of this reduction carbonyl iron powder is rather lower,as called by soft powder.
The active of carbonyl iron powder is big, after putting it in normal period time, it will happen automatic reunion because of the increase of entropy. The particle size of the agglomerated iron powder increases, and the particles are sticky and have a relatively large influence on injection molding applications.
In currently, the best quality carbonyl iron powder is produced by German BASF company on the market. Its process requests for carbonyl iron powder is very high, the temperature change 3 degree when 5 carbonyl iron decomposition
The appearance: dark grey powder.
