| 摘要 |
PROBLEM TO BE SOLVED: To prevent seizure with a piston by strengthening joining with a cylinder body and uniformizing transfer of heat. SOLUTION: In a cylinder sleeve, a sleeve basic material is formed by using a rapidly solidified extrusion forming powder, having a chemical composition added with silicon (Si) of quantity to be a hyper-eutectic crystal composition to an aluminum alloy and projections parallely continuing in the length direction having 0.1-2 mm height, are formed on the outer surface of the sleeve basic material by adjusting the extruding conditions and also, fine cracks having depth of 10μm- 20% of sleeve basic material thickness at the maximum, are uniformly distributed on the surface. A cylinder block for an internal combustion engine is produced by casting the sleeve 3 made of aluminum alloy in the cylinder body 2a cast in aluminum alloy and the sleeve 3 is formed by using the sleeve basic material.
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