Patent ID: 7412955
Filing Date: 2008-08-19
Classification: B22D,C22C,C22F,F02F,F05C,Y10T

Abstract:
1. An engine component composed of an aluminum alloy containing silicon, comprising: a plurality of silicon crystal grains located on a slide surface; wherein the plurality of silicon crystal grains have a grain size distribution having at least two peaks; and the at least two peaks include a first peak existing in a crystal grain size range of no less than about 1 μm and no more than about 7.5 μm and a second peak existing in a crystal grain size range of no less than about 12 μm and no more than about 50 μm; wherein in any arbitrary rectangular region of the slide surface having an approximate area of 800 μm×1000 μm, the number of circular regions having a diameter of about 50 μm and not containing any silicon crystal grains of a crystal grain size of about 0.1 μm or more is equal to or less than five.