| 摘要 |
PROBLEM TO BE SOLVED: To improve the mechanical strength and wear resistance of an engine valve made of an aluminum alloy by uniformly dispersing ceramic particles having projecting and recessed parts with the rounded outer periphery in a base material made of an aluminium alloy. SOLUTION: The whole of a valve in an engine valve 1 for intake is formed from a raw material made by uniformly dispersing ceramic particles 3 in a base material 2 made of an aluminum alloy. The base material 2 to be used is preferably a non-heat treated aluminum alloy such as JIS 5083 material composed of 4-4.9 wt.% Mg, 0.4 wt.% Si, 0.4 wt.% Fe, 0.4-1.0 wt.% Mn, 0.25 wt.% Zn, 0.15 wt.% Ti, 0.05-0.25 wt.% Cr, 0.1 wt.% Cu and the residue, which is composed of Al and inevitable impurities. As the ceramic particles 3, preferably used is a mixture of one or two kinds such as Al2 O3 , ZrO2 moderately having the projecting and recessed parts on the outer peripheral surface thereof in an arbitrary sectional form, with a mean particle diameter of about 3μm.
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