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US 2008/0184879 A1Published application
Piston having improved wear resistance and method of making
OwnerNicholas LoBiondo, Bruce Inwoodinventors
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OwnerNicholas LoBiondo, Bruce Inwoodinventors
Estimating the term…
A piston formed from an Al—Si alloy having an average Si composition includes a high wear region having a surface that is Si-rich with respect to the average Si composition of the Al—Si alloy. The surface of the predetermined high wear region is treated, as by etching, to selectively remove Al from the surface to produce the Si-rich region. The Si-rich region has improved resistance to wear. The piston may be treated to produce one or more high wear regions which are Si-rich with respect to the average Si composition of the alloy. High wear regions may include the annular grooves for receiving a piston ring, the piston skirt and the pin bore.
A piston formed from an Al—Si alloy having an average concentration of Si in the alloy and having a predetermined high wear surface region of the piston having a Si concentration which is greater than the average Si concentration of the alloy.
A piston formed from an Al—Si alloy having an average concentration of Si and an annular surface, the annular surface having a radially inwardly extending groove formed therein having a grooved surface which has a Si concentration which is greater than the average Si concentration of the alloy.
A piston formed from an Al—Si alloy having an average concentration of Si in the alloy, said piston having a piston skirt with a skirt surface having a Si concentration which is greater than the average Si concentration of the alloy.
A piston formed from an Al—Si alloy having an average concentration of Si and a piston pin boss bore having a bore surface which has a Si concentration which is greater than the average Si concentration of the alloy.
A method of making a piston, comprising:
Dependencies are inferred from the claim text.