Alloys or metallic compositions – Containing over 50 per cent metal but no base metal – Iron containing
Patent
1989-10-06
1991-09-17
Andrews, Melvyn J.
Alloys or metallic compositions
Containing over 50 per cent metal but no base metal
Iron containing
75532, 420 14, 420121, C22C 3304
Patent
active
050493574
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for manufacturing an iron-boron-silicon alloy containing, for example, 3 wt. % boron and 5 wt. % silicon.
BACKGROUND OF THE INVENTION
An iron-boron-silicon amorphous alloy containing, for example, 3 wt. % boron and 5 wt. % silicon has a high magnetic permeability and is widely applied as a magnetic material. Such an iron-boron-silicon amorphous alloy is obtained by supplying a molten iron-boron-silicon alloy containing 3 wt. % boron and 5 wt. % silicon onto the surface, for example, of a cooling rotary drum rotating at a prescribed circumferential speed, and rapidly cooling the molten alloy to solidify same into a thin sheet shape.
The above-mentioned iron-boron-silicon alloy is conventionally manufactured as follows: Into an electric furnace are charged, at prescribed ratios, a boron raw material comprising at least one of a boron ore such as a sodium borate ore a calcium borate ore or a colemanite ore, and a boric acid obtained by treating the above-mentioned boron ore by an acid, an iron-bearing source such as an iron ore or a scrap, and a carbonaceous reducing agent such as coke or coal. This charge is melted and refined in the electric furnace, and then solidified to prepare a solid iron-boron alloy, i.e., a ferroboron. Then, the thus prepared solid ferroboron and at least one of separately prepared solid silicon and ferrosilicon are added at prescribed ratios to a molten iron having a carbon content of up to 0.2 wt. % received in a melting furnace, and the mixture is melted, thereby manufacturing an iron-boron-silicon alloy.
The above-mentioned conventional method for manufacturing an iron-boron-silicon alloy has the following problem: The conventional manufacturing method comprises the preparing step of ferroboron in the electric furnace and the melting step of ferroboron and silicon into the molten iron in the melting furnace. The conventional manufacturing method is therefore complicated and requires much electric energy, resulting in an increased manufacturing cost of the iron-boron-silicon alloy.
Under such circumstances, there is a strong demand for the development of a method for economically manufacturing an iron-boron-silicon alloy through simple steps without requiring much electric energy, but such a method has not as yet been proposed.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to provide a method for economically manufacturing an iron-boron-silicon alloy through simple steps without requiring much electric energy.
In accordance with one of the features of the present invention, there is provided a method for manufacturing an iron-boron-silicon alloy, characterized by comprising the steps of:
adding a boron raw material comprising at least one of a boron ore and a boric acid, and a carbonaceous reducing agent to a molten iron received in a vessel;
blowing oxygen gas into said molten iron to keep said molten iron at a constant temperature through combustion of part of said carbonaceous reducing agent, and reducing said boron raw material in said molten iron by means of the balance of said carbonaceous reducing agent to prepare a boron-containing molten iron;
continuing said blowing of oxygen gas to decarburize said boron-containing molten iron until the carbon content in said boron-containing molten iron decreases to up to 0.2 wt. %; and
adding at least one of silicon and ferrosilicon to said boron-containing molten iron while stirring said boron-containing molten iron, thereby manufacturing an iron-boron-silicon alloy.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic vertical sectional view of a vessel, illustrating the preparing step of a boron-containing molten iron in a first embodiment of the method of the present invention;
FIG. 2 is a schematic vertical sectional view of the vessel, illustrating the decarburizing step of the boron-containing molten iron in the first embodiment of the method of the present invention; and
FIG. 3 is a schematic vertical sectional view of a vessel,
REFERENCES:
patent: 4572747 (1986-02-01), Sussman et al.
patent: 4602948 (1986-07-01), Singhal
patent: 4602950 (1986-07-01), Singhal et al.
patent: 4602951 (1986-07-01), Singhal
Kawai Yoshihiko
Kikuchi Yoshiteru
Matsuno Hidetoshi
Nishi Tadahiko
Takaoka Toshio
Andrews Melvyn J.
NKK Corporation
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