Surface layer for the working surface of the cylinders of a...

F - Mech Eng,Light,Heat,Weapons – 02 – F

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F02F 1/18 (2006.01) C23C 4/04 (2006.01) C23C 4/12 (2006.01) C23C 4/16 (2006.01) C23C 4/18 (2006.01)

Patent

CA 2416692

A surface coating of the working surface of a cylinder of a combustion engine is disclosed, having the combination of the fol- lowing characteristics: The coating is applied by plasma spraying; the surface of the coating comprises a plurality of open pores; the degree of poros- ity of the surface of the coating amounts to between 0.5 and 10 %; the statistic mean pore size amounts to between 1 and 50 µm, whereby at least nearly exclusively pores with a size of less than 100 µm are present; the pores are stochastically distributed in the surface of the coating, both as far as the area and the size is concerned; the coating comprises a content of bound oxygen of between 0.5 and 8 % by weight; the coating comprises inclusions of FeO and Fe3O4 crystals, serving as solid lubricants; and the rough- ness of the surface of the coating is adjusted by mechanically finishing to an arithmetic mean roughness R a of between 0.02 and 0.4 µm and to a mean peak-to-valley distance R z of between 0.5 and µm. The pores form a plurality of micro chambers, supporting the build-up of an oil film between piston rings and cylinder wall.

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