| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermal insulation coating method for an aluminum composite material whose porosity can be improved, its structure, and a piston.SOLUTION: The surface vicinity of an aluminum alloy is formed of a needle crystal porous ceramics reinforced aluminum composite material 13, and vicinity of the surface of the needle crystal porous ceramics reinforced aluminum composite material 13 is subjected to alumite treatment to form a thermal insulation coating film 14. |
