Patent ID: 6096143
Filing Date: 2000-08-01
Classification: B21J,B22D,B22F,B24B,C22C,C23C,F02F,F05C,Y10T

Abstract:
A cylinder liner of a hypereutectic aluminum/silicon alloy,(A) said aluminum/silicon alloy being free of hard material particles independent of the alloy and consisting of, in percent by weight: Silicon 23.0 to 28.0%, Magnesium 0.80 to 2.0%, Copper 3.0 to 4.5%, Iron at most 0.25%, Manganese, nickel and zinc each at most 0.01%, the remainder being aluminum;  (B) said cylinder liner containing primary silicon crystals and intermetallic phases having the following grain sizes, the numerical data denoting the mean grain diameter in .mu.m:Primary Si crystals: 2 to 15 .mu.m,Al.sub.2 Cu phase: 0.1 to 5.0 .mu.m,Mg.sub.2 Si phases: 2.0 to 10.0 .mu.m;(C) said cylinder liner having a precision-machined running surface, plateau faces of said primary silicon crystals and particles of intermetallic phases embedded in the running surface being exposed.