Document Type and Number:
Japanese Patent JPH0561333
Kind Code:
B2
Abstract:
In this method for manufacturing an aluminum alloy, a porous preform is manufactured from a mixture of a finely divided oxide (26) of a metallic element which has a weaker tendency to form oxide than does aluminum, and an additional substance (28) substantially more finely divided than that metallic oxide. Then an aluminum alloy containing a substantial quantity of silicon is permeated in the molten state through the porous preform. This causes the metallic oxide to be reduced by a thermite reaction, to leave the metal which it included as alloyed with the aluminum alloy. At this time, the silicon in the aluminum alloy does not tend to crystallize out upon the particles of the metallic oxide, which would interfere with such a reduction reaction by forming crystalline silicon shells around such metallic oxide particles and would lead to a poor final product, because instead the silicon tends to crystallize out upon the particles of the additional substance. This alloying method is effective even if the average particle diameter of the finely divided metallic oxide, on the assumption that it is in the form of globular particles, is less than about 10 microns. The melting point of the additional substance should desirably be substantially higher than the melting point of the aluminum alloy. The silicon content of the aluminum alloy may freely be greater than about 1.65% by weight. Desirably, the preform may further contain reinforcing fibrous material (30). And particularly, the additional substance may be Al2O3.
Inventors:
HAMASHIMA KANEO
DONOMOTO TADASHI
TANAKA ATSUO
KUBO MASAHIRO
DONOMOTO TADASHI
TANAKA ATSUO
KUBO MASAHIRO
Application Number:
JP7956886A
Publication Date:
September 06, 1993
Filing Date:
April 07, 1986
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD
International Classes:
B22D19/14; C22C1/00; C22C1/02; C22C1/10; C22C47/00; C22C47/08; C22C47/10; C22C47/12; C22C49/06; (IPC1-7): C22C1/02; C22C1/09; C22C1/10