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Iron ball paint |
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Iron ball paint has been used in coating the SR-71 Blackbird and F-117 Nighthawk, it's active molecule is made up by an iron atom surrounded by five dcarbon monoxide molecules. |
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| Author: Dragan Valeriu |
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Iron ball paint (paint based on iron carbonyl) a type of paint used for stealth surface coating.
The paint absorbs RF energy in the particular wavelength used by primary RADAR.
Chemical formula: C5FeO5 / Fe(CO)5
Molecular mass: 195.9 g/mol
Apparent density: 76.87 g/cmc
Molecular structure: An Iron atom surrounded by 5 carbon monoxide structures (it takes a ball-like shape, hence the name)
Melting point: 1536° C
Hardness: 82-100 HB
It is obained by carbonyl decomposition process and may have traces of carbon, oxygen and nitrogen
The substance (iron carbonyl) is also used as a catalyst and in medicine as an iron suppliment however it is toxic.
The painting of the F-117 is done by industrial robots however the F-117 is covered in tiles glued to the fuselage and the remaining gaps filled with iron ball paint.
This type of coating converts the radar wave energy into heat (by molecular oscilations) the heat is then transfered to the aircraft and dissipated. It is the exact same principle by wich water is heated in the microwave oven (radar uses microwaves).
About Author
aerospace engineering student at Universitatea Politehnica Bucuresti (Bucharest Roamania)
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