Method of manufacturing copper-iron alloys

Abstract

[Problem] To provide: a copper-iron alloy that, by adding rice husk ash, which is a plant-based silicon, as a catalyst to a metal obtained by dissolving copper and iron in a furnace, the gases during melting are degassed and the mixture of copper and iron becomes a metal with a uniformly distributed composition as a whole, so as to have high performance as a shielding material against electromagnetic waves; and a method for manufacturing the copper-iron alloy.　[Solution] Provided is a copper-iron alloy characterized by comprising a compound in which a mixture of copper and iron is uniformly dispersed, the configuration being realized by adding rice husk ash as a catalyst to a metal obtained by dissolving copper and iron in a furnace and performing natural convection or electromagnetic stirring.　

Description

Technical Field

[0001] The present invention is an improvement of a copper-iron alloy in which copper and iron are melted in a furnace, rice husk ash is added as a catalyst to the molten mixture, and the copper-iron mixture is uniformly distributed, and the copper-iron alloy has high performance as a shielding material against electromagnetic waves. manufacturing method It relates to.

Background Art

[0002] Conventionally, as a method for manufacturing a copper-iron alloy, in the method for manufacturing a copper-iron alloy of Patent No. 5608704 (Patent Document 1), electrolytic copper is melted in a first melting furnace, and a copper molten metal degassing step for degassing gas in the copper molten metal, and pure iron is melted in a second melting furnace different from the first melting furnace, and an iron molten metal degassing step for degassing gas in the iron molten metal, and the temperature of the copper molten metal in the first melting furnace is raised to be substantially the same as the temperature of the iron molten metal in the second melting furnace and then mixed, and a reaction step of causing copper and iron to undergo a crystallization reaction, and a pouring step of pouring the crystallized reaction molten metal into a mold are known as a method for manufacturing a copper-iron alloy. In addition, in the copper molten metal degassing step, a method of adding a deoxidizer containing at least one of silicon, phosphorus, or lithium to the copper molten metal is known. In addition, in the iron molten metal degassing step, a method of adding a deoxidizer containing at least one of aluminum, manganese, titanium, or silicon to the iron molten metal is also known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] Here, copper and iron are metals with completely different properties. Even if they are melted and mixed in separate furnaces, they will separate again when exposed to air. Therefore, a technique is used to cool the mixture without contact with air in order to uniformly stir the copper and iron and create a uniformly distributed compound. In this invention, we discovered that when copper and iron are melted in separate furnaces and then mixed and stirred together in a single furnace, and reacted with thermally decomposed plant-derived silica, such as rice husk ash, as a catalyst, gas is removed from the molten copper and iron, and the copper and iron compounds are uniformly dispersed by the action of the catalyst. Furthermore, even when this molten metal is rapidly cooled in a container such as an ingot case, with air blocked out, the characteristic of uniformly and well-balanced dispersion of the copper and iron compounds is not lost, leading to the completion of this invention. Furthermore, when metals that improve magnetic properties are added to the above catalysts, copper and iron alone are more effective than This increases the magnetic shielding effect. Furthermore, the above copper-iron compound is heated again and processed by extrusion, rolling, drawing, etc. Even if this is done, the shielding effect against electromagnetic waves will not be lost. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The problem that this invention aims to solve is the ability to add rice husk ash as a catalyst to molten copper and iron melted in a furnace, thereby creating a copper-iron alloy (although metallurgically copper and iron do not form a metallic compound, in this invention a mixture of copper and iron uniformly dispersed is called a copper-iron alloy) that has high performance as a shielding material against electromagnetic waves. [Means for solving the problem]

[0006] To solve the above problems, the present invention, 1 In this invention, A first electric melting furnace that melts fine copper powder to produce molten copper, A second electric melting furnace for melting pure iron to produce molten iron, A third electric melting furnace that mixes the molten copper after adjusting its temperature to match that of the molten iron, In the third electric melting furnace, a thermally decomposed plant silica ash is added as a catalyst. A copper-iron alloy characterized by being provided with a mixing means for natural convection and / or electromagnetic stirring in the third electric melting furnace, and being formed as a compound in which copper and iron are uniformly dispersed throughout by the catalyst. manufacturing method It is characterized by the following. Claim 2 In this invention, In the third electric melting furnace, magnetic poles, each with a coil wound around an iron core, are symmetrically arranged on the furnace wall at the outlet. A three-phase AC voltage is applied to these magnetic poles to generate a rotating magnetic field at the outlet. As the molten copper-iron passes through this rotating magnetic field, it becomes paramagnetic and generates eddy currents. The electromagnetic force generated between these eddy currents and the rotating magnetic field causes the molten copper and iron to rotate at the outlet of the third electric melting furnace, resulting in the molten copper and iron being uniformly mixed together via the catalyst, creating a copper-iron alloy in which copper and iron are uniformly dispersed. manufacturing method It is characterized by the following. [Effects of the Invention]

[0007] Copper and iron are metals with completely different properties. Even if they are melted together in a furnace to form an alloy, the copper and iron will separate when exposed to air. Therefore, in order to create a compound in which copper and iron are uniformly distributed, a technique is needed to cool it without contact with air. In this patent, after melting copper and iron in a furnace, the reaction is carried out using ash of thermally decomposed plant-derived silica and fine powder of rice husk ash (white silica) as catalysts. This process removes gas from the molten copper and iron, and the copper and iron compound is rapidly cooled in a container such as an ingot case, while keeping it out of the air, thus maintaining the characteristic of uniform dispersion of the copper and iron compound. Furthermore, if a metal that improves magnetic properties is added to the above catalyst, copper and iron alone are more effective than This increases the magnetic shielding effect. Furthermore, the above copper-iron compound is reheated and processed by extrusion, rolling, drawing, etc. Even if this is done, the shielding effect against electromagnetic waves will not be lost. Furthermore, by melting copper and iron in separate furnaces or the same furnace, and then adding the ash of thermally decomposed rice husks as a catalyst, a compound is formed in which copper and iron are uniformly dispersed throughout, resulting in a high electromagnetic wave shielding effect. After melting copper and iron in a furnace, adding rice husk ash, which is the ash of pyrolyzed vegetable silica, as a catalyst, the characteristic that copper and iron are uniformly dispersed is not lost even when the air is blocked and cooled. Also, rice husk powder can simultaneously deaerate gas from the copper and iron baths. And this copper-iron compound does not lose its electromagnetic wave shielding effect even when reheated and processed into a product.

Brief Description of the Drawings

[0008] [Figure 1] It is an explanatory diagram of the copper-iron alloy of Example 1. [Figure 2] It is a flowchart of the copper-iron alloy. [Figure 3] It is an explanatory diagram of Example 2.

Modes for Carrying Out the Invention

Examples

[0009] The preferred embodiments of this invention will be described below with reference to the drawings. Put fine powder copper 11 into the first electric melting furnace 1 and melt it, and deaerate the gas in the copper melt 11A with a deoxidizer or the like.

[0010] Next, put pure iron 12 into the second electric melting furnace 2 and melt it, and deaerate the gas in the iron melt 12A with a deoxidizer or the like. Raise the temperature of the copper melt 11A in the first electric melting furnace 1 to be approximately the same as the temperature of the iron melt in the second electric melting furnace 2, and then mix the copper melt 11A and the iron melt 12A in the third electric melting furnace 3.

[0011] Mix the copper melt 11A and the iron melt 12A in the third electric melting furnace 3, and further add the ash 4 of pyrolyzed vegetable silica as a catalyst. Here, white silica fine powder also has the function of a deoxidizer and can simultaneously function as a catalyst for copper and iron. As a result, gas is removed from the molten copper and iron 11A and 12A, and the reaction molten metal that has undergone the crystallization reaction is mixed by natural convection due to the temperature difference, and / or by electromagnetic stirring means 15 provided in the third electric melting furnace 3, the copper and iron are kneaded into a state in which they are uniformly dispersed throughout while air is blocked off, thereby producing a reaction molten metal that has undergone the crystallization reaction, and a copper-iron alloy can be produced by pouring the molten metal into a container such as a mold while air is blocked off.

[0012] The ingots obtained by pouring have a uniform distribution of Cu / Fe compound crystals and can be processed into various industrial materials through methods such as extrusion, rolling, and drawing. Such industrial materials have excellent properties as shielding materials against electromagnetic waves because they contain dispersed crystal fragments of Cu / Fe, which are highly magnetic materials. Here, the third electric melting furnace 3 is not a melting furnace that is physically different from the first and second melting furnaces, but may be a furnace that serves the function of the third electric melting furnace 3, and can be used for both purposes. [Examples]

[0013] Example 2 shows an example of natural convection and electromagnetic stirring means 15 in the third electric melting furnace 3 shown in Figure 2. Magnetic poles 6, each with a coil wound around an iron core, are symmetrically arranged on the furnace wall of the outlet 3A of the third electric melting furnace 3.

[0014] When a three-phase AC voltage 7 is applied to this magnetic pole 6, a rotating magnetic field 8 is generated at the outlet 3A of the third electric melting furnace 3. When the molten copper-iron mixture described above is passed through this rotating magnetic field 8, eddy currents are generated because the molten copper-iron mixture is paramagnetic.

[0015] Furthermore, an electromagnetic force is generated between the eddy current and the rotating magnetic field, causing the molten copper and molten iron to rotate at the outlet 3A of the electric melting furnace 3. The molten copper and molten iron are mixed together by this rotation. As a result, any air bubbles remaining in the molten copper and molten iron are crushed and degassed.

[0016] Furthermore, as the molten copper and molten iron are mixed together, convection occurs due to the temperature difference, as mentioned earlier, causing the catalyst, the plant-derived silica 4, to be uniformly mixed. Additionally, the molten copper and molten iron rotate due to electromagnetic force, further uniformly mixing the copper and iron throughout the mixture. This mixed copper-iron molten metal is removed from the outlet 3A of the third electric melting furnace 3, and rapidly cooled by shutting off the air, thereby producing a copper-iron alloy in which copper and iron are uniformly dispersed.

[0017] [Advantages of copper-iron alloys] After melting copper and iron in a furnace, thermally decomposed plant-derived silica is added as a catalyst. The copper and iron are then dispersed and kneaded together by electromagnetic force. As a result, highly permeable Cu / Fe crystal fragments are dispersed within the Cu material, giving it excellent properties as a shielding material with high shielding effect against electromagnetic waves, for example.

[0018] Furthermore, adding metals such as cobalt, nickel, and manganese, which improve magnetic properties, to the above catalysts results in a higher magnetic shielding effect than that of copper and iron. Even if the above copper-iron alloy is reheated and processed into products by extrusion, rolling, drawing, etc., the electromagnetic wave shielding effect is not lost. [Explanation of symbols]

[0019] 1. Electrolytic melting furnace 2. Electrolytic melting furnace 3. Electrolytic melting furnace 3A Outlet 4. Plant-derived silica ash 5 Copper-iron alloy 6 magnetic poles 7. Three-phase AC voltage 8. Rotating Magnetic Field 11 Fine powder copper 11A Copper bath 12 Pure Iron 12A iron bath 15 Mixing means / stirring means

Claims

1. A first electric melting furnace that melts fine copper powder to produce molten copper, A second electric melting furnace for melting pure iron to produce molten iron, A third electric melting furnace that mixes the molten copper after adjusting its temperature to match that of the molten iron, In the third electric melting furnace, a thermally decomposed plant silica ash is added as a catalyst. A method for producing a copper-iron alloy, characterized in that a mixing means by natural convection or electromagnetic stirring is provided in the third electric melting furnace, the catalyst causes copper and iron to be uniformly dispersed throughout the compound, and the mixture is cooled by blocking out air.

2. The method for producing a copper-iron alloy according to claim 1, characterized in that magnetic poles, each having a coil wound around an iron core, are symmetrically arranged on the furnace wall of the outlet of the third electric melting furnace, a three-phase alternating current voltage is applied to the magnetic poles to generate a rotating magnetic field at the outlet, molten copper-iron passes through the rotating magnetic field causing the molten copper-iron to become paramagnetic and generate eddy currents, and the electromagnetic force generated between these eddy currents and the rotating magnetic field causes the molten copper and molten iron to rotate at the outlet of the third electric melting furnace, thereby uniformly mixing the molten copper and molten iron through the catalyst, resulting in a copper-iron alloy in which copper and iron are uniformly dispersed.

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