Summary for aluminium wear coating Discussion
Wear coating for aluminium to aluminium sliding contact is discussed in the context of a heat-engine crosshead slider and housing made from cast aluminium, running at about 2 m/s and 5 MPa with plenty of oil. Paul van de Loo asks for a coating or treatment that will improve wear, mentioning the silicon treatment used in some Mercedes and Porsche engine bores. Dr. Wolfgang Schwarz says his group can create wear-resistant surface layers on aluminium alloys several millimeters thick, with hardness up to 300 HV or more under some conditions, using electron beam welding with a high-alloy filler material. Another reply identifies the Mercedes/Porsche bore treatment as probably nickel-silicon carbide plating, where silicon particles are occluded into nickel plating. The thread does not compare the options directly, but it points to both custom hard surface layers and nickel-silicon carbide plating as possible wear solutions.
Q. We are developing a new heat engine that has a cast aluminium crosshead slider that bears against a flat running surface on a cast aluminium housing. Peak sliding speed is only 2m/s, pressure of the order of 5MPa. Plenty of lubricating oil will be present. We require a coating for these surfaces that will give good wear properties. I have heard of a silicon treatment for aluminium bores in internal combustion engines -used in some Mercedes models and Porsches 944 and 928. I cannot find any information on it however. Can anyone help with suggestions of suitable coatings/treatments?
Paul van de Loo
– Adelaide, SA Australia
2000
A. Hello,
I am an engineer for materials science.
We are able to produce surface-layers on aluminium alloys with a thickness of some millimeters and with a hardness up to 300 HV – under certain conditions even more. We use the electron beam welding and high alloyed filler material to get a wear resistant surface.
Best regards
Dr. Wolfgang Schwarz
Institute of Solid State and Materials Research – Dresden, Germany
2001
A. Hi, Paul
The coating on the Mercedes and Porsche cylinders is probably nickel-silicon carbide plating — silicon particles occluded into nickel plating.
Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
April 1, 2011