Method for forming aluminum-silicon alloy
AssigneeAtsugi Unista Corporation
InventorsMasato Sasaki, Yoshihiro Yamada
Life of this patent
Estimating the term…
Abstract
An aluminum-silicon alloy having excellent mechanical characteristics is formed by pressure casting of a molten material concurrently with modifying thereof by a flux which includes at least one element selected from the group of Na, Sb, Sr, and/or Ca, allowing a substantially fine grain of silicon to be dispersed in the alloy. Alternatively, the step of the pressure casting is replacable by substantial uniform cooling of the molten material regardless of a thickness thereof by cooling a die having a mold formed of a Cu-W type material, which mold corresponds to a substantially thick portion of the alloy.
Claims8
A method for forming an aluminum-silicon alloy article partially having thicker portions comprising the steps of:
- adding a flux to a molten aluminum-silicon alloy material for modification of said material;
- and
- casting said molten material under pressure of at least 200 kg/cm.sup.2 to substantially reduce dendrite arm spacing of said molten material and to accelerate a cooling speed of said material in the thicker portions of said article;
- wherein said step of modification cooperates with the step of casting to provide a substantially fine grain size of silicon to be included in said material over the whole area thereof regardless of the thickness of the article.
A method for forming an aluminum-silicon alloy article partially having thicker portions comprising the steps of:
- adding a flux to a molten alloy material for modification of said material;
- providing a die to receive a molten aluminum-silicon alloy material, said die being partially formed of Cu-W alloy at corresponding portions thereof which surround the thicker portions of the article, said die being operative to substantially remove heat from said molten alloy material;
- preliminarily cooling said die to a temperature at which cooling speed of said alloy material corresponding to the thicker portions of said article is accelerated;
- pre-cooling said die;
- pouring said modified molten material into said pre-cooled die;
- and
- cooling, substantially uniformly, said material in said die to accelerate a cooling speed of said material corresponding to the thicker portions of said article;
- wherein said step of modification of the molten material cooperates with the step of cooling said material to provide a substantially fine grain of silicon to be included in said material over the whole area thereof regardless of the thickness of the article.
Dependencies are inferred from the claim text.