Aluminium powder

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Aluminium pigment powder Aluminium pigment powder.JPG
Aluminium pigment powder

Aluminium powder is powdered aluminium.

This was originally produced by mechanical means using a stamp mill to create flakes. Subsequently, a process of spraying molten aluminium to create a powder of droplets was developed by E. J. Hall in the 1920s. The resulting powder might then be processed further in a ball mill to flatten it into flakes for use as a coating or pigment. [1] Aluminium powder features low density with high conductivity. [2]

Contents

Usage

Depending on the usage, the powder is either coated or uncoated.

Aluminium granules

Aluminium granules are a larger particle size alternative to aluminium powders. There is no official size range for granules vs. powders with sources describing granules with particle sizes anywhere from 0.1-40 mm. [6] Granules are useful as they maintain the free-flowing nature of powders but have lower surface area decreasing explosion risk.

Safety

Aluminium is insoluble. Although aluminium is unlikely to be adsorbed into the blood stream, its inhalation can cause severe irritation and hinder the ventilation mechanism. [7] High levels of exposure over many years may result in aluminosis which causes pulmonary fibrosis. [8]

Aluminium powder and dust is highly flammable and creates a significant risk of fire or explosion. There have been many incidents in industries which produce such dusts and powders. [9]

See also

References

  1. Joseph R. Davies (1993), "Powder Metallurgy Processing", Aluminum and Aluminum Alloys, ASM International, p. 275, ISBN   9780871704962
  2. Gromov, A.A.; Nalivaiko, A.Yu (2019). "Chapter 5 - Aluminum Powders for Energetics: Properties and Oxidation Behavior". In Yan, Qi-Long (ed.). Nanomaterials in Rocket Propulsion Systems. Elsevier. pp. 151–173. ISBN   9780128139080.
  3. Champod, Christophe; Lennard, Chris J.; Margot, Pierre; Stoilovic, Milutin (2004-04-27). Fingerprints and Other Ridge Skin Impressions. CRC Press. ISBN   9780203485040.
  4. Space Shuttle Basics –Solid Rocket Boosters, NASA, archived from the original on 2000-10-02
  5. "Silver-coated Aluminum Powder". Stanford Powders. Retrieved Aug 29, 2024.
  6. Neikov, Oleg D.; Naboychenko, Stanislav S.; Mourachova, Irina, eds. (2009). Handbook of Non-Ferrous Metal Powders: Technologies and Applications. Burlington: Elsevier. pp. 271–274. ISBN   978-1-85617-422-0.
  7. "Aluminum | Toxic Substances | Toxic Substance Portal | ATSDR". wwwn.cdc.gov. Retrieved 2025-01-20.
  8. "Aluminium, Dusts containing aluminium as metal, aluminium oxide and aluminium hydroxide", MAK Value Documentation, 2007, doi: 10.1002/3527600418.mb742990vere4313
  9. Urben, Peter (2013-10-22), Bretherick's Handbook of Reactive Chemical Hazards, Elsevier, p. 22, ISBN   978-0-08-052340-8