To strengthen the surface layer of light metal such as aluminum or magnesium or an alloy thereof so that the strengthening layer is in no danger of peeling off from a base material and the base material is exposed to the surface.
Strengthening particles 6 of WC which are harder and have a higher specific gravity than a base material M of an aluminum alloy and which does not form an alloy with a metal element of the base material M are settled in the molten base material M with gravity to be deposited in the lower part of the molten part, then the molten base material M is floated on the upper side of the deposited layer 9 of the strengthening particles 6 and the gap between the strengthening particles 6 in the deposited layer 9 is filled. The base material M floated on the upper side of the deposited layer 9 is removed after solidification. Thus, the deposited layer 9 of the strengthening particles 6 does not peel off, and the base material M is exposed to the surface.
WATANABE YOSHITAKA
KITANAKA ISAO
TANIGUCHI MASAKI
| JPH04120280A | 1992-04-21 | |||
| JP2003106265A | 2003-04-09 | |||
| JPH0681113A | 1994-03-22 |
Higashio Masahiro
Takayoshi Tagawa
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