Alusil

Alusil as a hypereutectic aluminium-silicon alloy (EN AC-AlSi17Cu4Mg / EN AC-48100 or A390) contains approximately 78% aluminium and 17% silicon.[1][2] This alloy was theoretically conceived in 1927 by Schweizer & Fehrenbach,[3] of the Badener Metall-Waren-Fabrik, 2a Hermannstraße, Baden-Baden;[4] but practically created only by Lancia[5] in the same year, for its car engines. It was further developed by Kolbenschmidt.[2]

The Alusil aluminium alloy is commonly used to make linerless aluminium alloy engine blocks.[6] Alusil, when etched, will expose a very hard silicon precipitate. The silicon surface is non-porous enough to hold oil, and is an excellent bearing surface. BMW switched from Nikasil-coated cylinder walls to Alusil in 1996 to eliminate the corrosion problems caused through the use of petrol/gasoline containing sulfur.

Engines using Alusil include:

See also

References
  1. "ALUSIL - Cylinder Blocks for the new Audi V6 and V8 SI engines" (PDF). KS Aluminium-Technologie AG. KSPG-AG.com. Retrieved 13 January 2010.
  2. "What is Alusil coating?". finishing dot com. finishing.com. Retrieved 13 January 2010.
  3. "Rheinmetall's tradition of automotive excellence". Rheinmetall Defence. Rheinmetall-Detec.de. January 2006. Archived from the original on 25 September 2006. Retrieved 23 May 2020.
  4. Addreßbuch Baden-Baden 1926 (PDF). Baden-Baden: Ernst Koelblin. pp. 49, 80, 185, 375.
  5. Manicardi N. (2014). Pionieri dell'automobile. Lancia, Bazzi, Ferrari. Modena (IT): Il Fiorino. ISBN 88-7549-464-9.
  6. "High-performance engine blocks for tomorrow's challenges". Kolbenschmidt Pierburg AG. KSPG-AG.com. 12 September 2005. Archived from the original on 2012-10-07. Retrieved 13 January 2010.
  7. "KS Aluminium-Technologie: engine blocks for the new Audi A6". Rheinmetall AG. Rheinmetall.de. August 2004. Retrieved 13 January 2010.
  8. "High-tech products for the new and advanced BMW V12". Kolbenschmidt Pierburg AG. KSPG-AG.com. 10 January 2003. Archived from the original on 2012-10-07. Retrieved 13 January 2010.
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