KR101264219B1 - Mg alloy and the manufacturing method of the same - Google Patents

Abstract

The present invention relates to a magnesium-based alloy and a method for manufacturing the same, and more particularly, melting at least one selected from magnesium or magnesium-based alloy; Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; Preparing a magnesium mother alloy by cooling an alloy of at least one selected from the molten magnesium or magnesium-based alloys and powders or pulverized products of nickel, titanium, silicon or boron; Melting nickel, titanium, silicon or boron; And a magnesium base alloy is added to the molten nickel, titanium, silicon, or boron to prepare a magnesium alloy. The method provides a magnesium alloy prepared by the above method and a magnesium alloy prepared by the above method.
In the present invention, in the manufacture of an alloy using a highly volatile magnesium, to prepare a magnesium mother alloy at low temperature in the first step to reduce the loss of highly volatile magnesium primarily, the mother alloy in the melting process of the alloy in the second step By reducing the final loss of magnesium, the production cost of magnesium alloy can be reduced and quantitatively reproducible, and the production of magnesium alloy with excellent mechanical properties is improved by adding various kinds of additives in the process of manufacturing the above alloy. Is possible.

Description

Mg alloy and the manufacturing method of the same

The present invention relates to a magnesium-based alloy and a method for manufacturing the same, and more particularly, melting at least one selected from magnesium or magnesium-based alloy; Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; Preparing a magnesium mother alloy by cooling an alloy of at least one selected from the molten magnesium or magnesium-based alloys and powders or pulverized products of nickel, titanium, silicon or boron; Melting nickel, titanium, silicon or boron; And a magnesium base alloy is added to the molten nickel, titanium, silicon, or boron to prepare a magnesium alloy. The method provides a magnesium alloy prepared by the above method and a magnesium alloy prepared by the above method.

In the present invention, in the manufacture of an alloy using a highly volatile magnesium, to prepare a magnesium mother alloy at low temperature in the first step to reduce the loss of highly volatile magnesium primarily, the mother alloy in the melting process of the alloy in the second step By reducing the final loss of magnesium, the production cost of magnesium alloy can be reduced and quantitatively reproducible, and the production of magnesium alloy with excellent mechanical properties is improved by adding various kinds of additives in the process of manufacturing the above alloy. Is possible.

Magnesium (Mg) or alloys containing magnesium as a main component has low specific gravity, excellent specific strength and rigidity, and the demand is gradually increasing in a wide range of fields such as notebooks, mobile device cases, cameras, and lightweight materials for automobiles. It is becoming. In particular, when the magnesium alloy is applied to automobile parts, it is possible to improve fuel economy based on the characteristics of the ultra-light structural material, and thus reflect the practical demands of the automotive industry, and thus the magnesium alloy is spotlighted as a core material of the industry. I am getting it.

Magnesium-based alloys can improve mechanical properties including strength, hardness, elongation and high temperature strength as heat-resistance properties by adding specific alloying elements to magnesium-nickel alloys and magnesium-zinc alloys, or changing manufacturing conditions including specific heat treatments. The magnesium alloy produced as described above may be produced using various types of materials such as plates, rods, and powders, and the manufacturing method of the magnesium alloy may include casting methods including high pressure die casting, sand casting, and inves. Process casting, permanent mold casting, continuous casting, semi-melt molding, and composite powder metallurgy are used.

Casting magnesium alloys have a low melting point of magnesium, strong oxidative properties and volatility, so that SF ₆ , HFC-134a (R-134a), Ar, N ₂ , Ne, CO ₂ , BF ₃ , SO ₂ F ₂ and SO ₂ Although it is manufactured under a protective gas (clean gas) and an inert gas atmosphere or a vacuum atmosphere of 10 ^-4 Torr to 50 Torr, the loss rate of magnesium due to oxidation and volatilization is still large during the manufacturing process, and it is difficult to control the loss rate. . In particular, in the case of an alloy system having a large difference in melting temperature or a low solubility between two elements, such as a magnesium-nickel alloy system, the loss rate of magnesium is further increased, and the loss rate is difficult to control.

The present invention has been made to solve the above problems, the present invention is to prepare a magnesium-based mother alloy at low temperature in one step, and to reduce the loss rate of magnesium by producing a magnesium-based alloy of the final target composition in two steps It is aimed at minimizing and thus reproducibly implementing quantification of magnesium in magnesium-based alloys.

In addition, a method of preparing a magnesium-based alloy having improved mechanical and chemical properties, such as strength and corrosion resistance, by incorporating at least one or more additives in the manufacturing process of the magnesium-based alloy, miniaturization of the structure, formation of dispersed phases and improvement of precipitation behavior and It is another object to provide a magnesium-based alloy to be produced.

The present invention comprises the steps of melting at least one selected from magnesium or magnesium-based alloy to achieve the object as described above; Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; Preparing a magnesium mother alloy by cooling an alloy of at least one selected from the molten magnesium or magnesium-based alloys and powders or pulverized products of nickel, titanium, silicon or boron; Melting nickel, titanium, silicon or boron; And adding a magnesium mother alloy to the molten nickel, titanium, silicon, or boron to produce a magnesium-based alloy.

Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; at least one selected from the molten magnesium or magnesium-based alloy When melting, the powder of nickel, titanium, silicon or boron or powder of pulverized powder is added while melting the powder or pulverized powder of nickel, titanium, silicon or boron, or powder of nickel, titanium, silicon or boron Alternatively, it is preferable to melt the powder or the pulverized product of nickel, titanium, silicon, or boron by adding the pulverized product to a melting temperature of the powder or the pulverized product of nickel, titanium, silicon or boron.

At least one selected from the molten magnesium or magnesium-based alloy is further melted by adding a powder or a powder of nickel, titanium, silicon or boron; in the case of the nickel powder or a powder, the magnesium or magnesium-based alloy After melting at least any one selected from the melting temperature to 600 ~ 750 ℃, and then added nickel powder or pulverized and heated to 750 ~ 800 ℃ again to melt the nickel powder or pulverized, or the magnesium or It is preferable to maintain the melting temperature of at least one selected from the magnesium-based alloy at 750 to 800 ° C. so that the nickel powder or the pulverized product can be melted to melt the nickel powder or the pulverized product.

The molten magnesium or magnesium-based alloy is further melted by adding a powder or a pulverized powder of nickel, titanium, silicon or boron to at least one selected from the group consisting of molten magnesium or magnesium-based alloy. Or when the combined weight of at least one selected from the magnesium-based alloy and the powder or pulverized product of nickel, titanium, silicon or boron is 100%, it is preferably 10 to 70% by weight.

Melting at least one selected from the group consisting of magnesium and magnesium-based alloys; Or further melting by adding a powder or a pulverized product of nickel, titanium, silicon, or boron to at least one selected from the molten magnesium or magnesium-based alloy; and at least one flux selected from MgCl ₂ , KCl, and NaCl. It is preferable to add more.

The master alloy and the flux is a powder or a pulverized product, and the powder or the pulverized product of the nickel, titanium, silicon or boron or the pulverized product and the flux and the master alloy are preferably added using a vibrating feeding conveyor. .

Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; Thereafter, it is preferable to further include the step of separating and removing the slag.

Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; Thereafter, the step of casting into a magnesium mother alloy ingot, the step of adding a magnesium mother alloy to the molten nickel, titanium, silicon or boron to produce a magnesium-based alloy; After that, it is preferable to further include the step of casting to a magnesium-based alloy.

In the step of melting the nickel, titanium, silicon or boron; it is preferable to further add 1 to 10% by weight of carbon relative to the weight of the nickel, titanium, silicon or boron.

When melting the nickel, the melting temperature is preferably in the range of 1300 ~ 1500 ℃.

Melting at least one selected from the group consisting of magnesium and magnesium-based alloys; Or further adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy to further melt the powder; Or melting the nickel, titanium, silicon, or boron; Ag, Al, B, Bi, C, Ca, Cu, La, Mn, Nb, Pb, Si, Ti, Sr, Ba Sc, Y, Ce, It is preferable to further add at least one selected from Pr, Pm, Sm, Ea, Gd, Dy, Tb, Ho Er, Tm and Yb.

The magnesium-based alloy is preferably at least one selected from AZ31 magnesium alloy, AZ91D magnesium alloy and mischmetal.

The melting steps are preferably performed under an atmosphere of SF ₆ , HFC-134a (R-134a), Ar, N ₂ , Ne, CO ₂ , BF ₃ , SO ₂ F _2, and SO ₂ .

The crucible selected during melting is low carbon steel with less reactivity to the magnesium or magnesium alloy, less than 0.12% carbon, stainless steel without Ni, cast steel, clad, silica (SiO ₂ ), ceramic, cemented carbide It is preferable that it is any one selected from a material.

The present invention also provides a magnesium-based alloy in which magnesium is not lost and quantitatively maintained in order to achieve the object as described above.

According to the present invention as described above, by producing a magnesium-based master alloy at low temperature in one step, and by producing a magnesium-based alloy of the final target composition in two steps, the loss rate of magnesium can be minimized, and thus the stoichiometric prediction There is an effect that can produce a matching magnesium-based alloy reproducibly.

In addition, by adding at least one additive in the manufacturing process of the magnesium-based alloy, it is possible to manufacture a magnesium-based alloy with improved mechanical and chemical properties such as strength and corrosion resistance through the refinement of the structure, the formation of dispersed phases and the improvement of precipitation behavior.

1 is a schematic diagram of a manufacturing apparatus for manufacturing a magnesium-based alloy according to an embodiment of the present invention.
Figure 2 shows the microstructure photograph after manufacturing the mother alloy according to an embodiment of the present invention.
Figure 3 shows a microstructure photograph after manufacturing a two-stage magnesium alloy according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings and examples.

In the present invention, by melting and manufacturing the magnesium-based alloy in a high vacuum atmosphere or inert atmosphere, a strong magnesium-based alloy can be produced as a product without an oxide film, and the loss rate of magnesium can be reduced. More specifically, a magnesium master alloy was prepared in the first step by adding a powder or a pulverized powder of nickel, titanium, silicon or boron in the vicinity of the melting point of magnesium having a relatively low melting point, thereby reducing the loss rate of magnesium and thus quantitatively analyzing the magnesium alloy. In the second step, the master alloy was added to the nickel, titanium, silicon or boron molten metal higher than the melting point used in the manufacture of the magnesium master alloy, thereby obtaining magnesium of the final target composition. System alloys were prepared.

However, in the present embodiment, except for the difference in melting point in consideration of similarities in the overall process in view of the limited to the embodiment for nickel, but in the case of other zinc, titanium or boron is almost the same in the process As applicable, the present invention should not be construed as being limited to nickel.

In the present invention, a process of manufacturing a master alloy (Pre-alloy, Master Alloy, Intermediate Alloy) was introduced, in order to uniformly add the alloying elements as a quantitative amount during alloy production, when the alloying element is added at once, the fluidity is high and the viscosity is high. Since it is not uniformly dispersed in the metal melt, it can be made into a mother alloy containing a large amount of additive elements, pulverized and added to the metal melt by the desired amount, and diluted. In particular, since it is almost impossible to directly add a small amount of a specific element directly to the molten metal, a mother alloy containing a large amount of the main component element of the molten metal and a small amount of the specific element is prepared and added to the molten metal.

In addition, when the melting point of the additive element is different from the melting point of the main component of the molten metal (Ni: 1455 ℃, Mg: 650 ℃, Zn: 420 ℃, Ti: 1668 ℃) and solid solution with other elements such as Pb If there is little or less, alloy element input method using a mother alloy may be used to reduce segregation of elements that are difficult to alloy. When the melting point of the additive element is high, when entering the alloy manufacturing operation without passing through the master alloy, the total melting temperature is increased to melt the additive element, but when the mother alloy is used, the melting point of the additive element is lowered. Additives can be melted and added, which is advantageous for reducing manufacturing costs. Therefore, in the manufacture of alloys composed of various elements, a multi-alloy can be easily manufactured by using a mother alloy composed of an element having a high melting point and a basic element among the components.

In addition, it is necessary to add in the form of a mother alloy when the alloying element, which is active like magnesium, has a lot of loss when added alone and is difficult to match with an alloying element. Particularly, when the specific gravity difference with molten metal is large, when added alone, the loss rises over the molten metal, so that when the main component of the molten metal is added in the form of a mother alloy containing a large amount of the molten metal, the specific gravity difference is small so that it can be easily introduced into the molten metal. Strong magnesium is less likely to be exposed to the outside environment, which can significantly reduce the loss rate.

In this regard, the magnesium-nickel alloy according to the present invention will have a significance.

<Step 1 Preparation of Master Alloy>

In the present invention, first, magnesium as a starting material is used as a magnesium alloy containing magnesium single or AZ31 magnesium alloy, AZ91D magnesium alloy and mischmetal, Mg-Zr, Mg-Si, Mg-Ca, Mg-CaO and the like. It was.

Where A is Al, Z is Zn, and 31 and 91 are Al: Zn = 3: 1 or 9: 1, respectively.

In order to prevent the oxidation and volatilization of magnesium, the atmosphere of the furnace for melting magnesium is SF ₆ , HFC-134a (R-134a), Ar, N ₂ , Ne, CO ₂ , BF ₃ , SO depending on the characteristics of each process. ₂ F ₂ and SO ₄ Maintaining a clean gas (protective gas) atmosphere or a vacuum atmosphere of 10 ^-4 Torr to 50 Torr, and the crucible used in the melting furnace is preferably made of mild steel, stainless or ceramic material with low reactivity with magnesium.

In particular, unlike magnesium and magnesium alloy, the oxide film continuously grows once oxidation starts, and since the oxidation reaction occurs explosively, it is impossible to manufacture magnesium and magnesium alloys in the air, so it is performed under the above atmosphere. It is.

In addition, the magnesium-nickel alloy manufacturing process consisting of two steps Ag, Al, B, Bi, C, Ca, Cu, La, Mn, Nb, Pb, Si, Ti, Sr, Ba Sc, Y, Ce, Pr By adding at least one alloying element selected from among Pm, Sm, Ea, Gd, Dy, Tb, Th, Ho Er, Tm and Yb, magnesium alloy having improved mechanical properties through grain refinement and better corrosion resistance It can manufacture.

The use of Al, Cu, rare earth metals, Th, Zr, Li, Mn, Ag, Si, Y, Zn, etc. has the property of improving the mechanical properties of the alloy through subsequent heat treatment. In particular, Al is used to improve pressure resistance and strength, Th is to improve elongation, creep resistance, and room temperature strength, and Zn is to improve alloy castability, room temperature strength, elongation, toughness, vibration damping ability, and the like. In order to improve silver pressure resistance, high temperature strength, creep resistance and yield strength, to improve the castability of silver and silver alloys, Zr to improve vibration damping ability, strength, weldability and forging property, and Y to room temperature strength, high temperature strength, Copper is effective in improving the corrosion resistance, Mn is effective in improving the ductility, impact value, and corrosion resistance, and Si is effective in improving the strength and creep resistance of the alloy.

Such a magnesium or magnesium alloy was melted under a protective gas atmosphere to prepare a molten metal. Here, magnesium was previously dried at a temperature of about 200 ° C. before preparing the molten metal. This drying process overcomes the errors that may occur when water or the like is contained, and is preferable for the determination of magnesium, but may be omitted.

Subsequently, when the nickel powder or the pulverized product is added to the molten metal, the master alloy containing 30 to 70% by weight is obtained when the total content of nickel is 100% by weight of magnesium or the magnesium alloy and the nickel powder or the pulverized product. molten metal was prepared. At this time, the molten metal was prepared while maintaining the range of 600 ~ 750 ℃ near the melting temperature of magnesium. At this time, since the melting point of magnesium is 650 ℃, it is determined that the magnesium alloy used as a raw material for the production of molten magnesium will be melted at a temperature lower or higher than the melting point of magnesium, the lower limit of the temperature range to 600 ℃ It is.

However, in consideration of the melting of the nickel powder or the pulverized product added afterwards, it is also possible to maintain a temperature range of 750 to 800 ° C. in which the nickel powder or the pulverized product can be melted.

The prepared master alloy makes it easy to determine the composition (content) of the final magnesium of the target alloy when it is added to the molten alloy, so that various master alloys having various nickel-magnesium compositions can be easily manufactured, that is, have a desired composition ratio. It can have various composition ratios, and the lower the nickel content is less than 30%, the greater the loss in the first-stage pre-alloy production and the strong reactivity of magnesium when it is added to the molten metal in the second-stage alloy production. Since the probability of magnesium loss is high and the nickel content is more than 70%, there is a problem that pre-alloy cannot be manufactured at 800 ° C. or lower. Therefore, the nickel content is critical in the above range. . Although not shown, this can be seen from the nickel-magnesium phase equilibrium.

Here, the primary master alloy is to prepare a magnesium molten metal and to disperse the nickel powder in the molten metal. Since the nickel is added in powder form, the surface of the nickel powder melts at a temperature range of 750 to 800 ° C. due to the high interfacial energy of the powder. Ni ₂ Mg or Mg ₂ Ni compound is produced.

As shown in FIG. 2, the morphology of the primary mother alloy is a form in which nickel powder is dispersed in a magnesium base, and the surface of the nickel powder has a form in which a compound with magnesium is formed. Here, the top, middle, and bottom pictures are magnified 100 times, 200 times, and 600 times, respectively. At this time, when the temperature is lower than 750 ℃ Ni ₂ Mg or Mg ₂ Ni compound is difficult to produce, when higher than 800 ℃ due to the large loss due to oxidation and volatilization of magnesium, it has a critical significance in the above temperature range.

A flux including at least one selected from MgCl ₂ and KCl may be further added to the magnesium-nickel melt to prevent magnesium oxidation and volatilization.

After the nickel powder or the pulverized product is added to the magnesium or magnesium alloy as described above, the melting temperature of the molten metal mixed with magnesium and the like can be maintained in the range of 750 ~ 800 ℃ as described above.

Meanwhile, a vibrating feeding conveyor is used in the process of injecting the nickel powder or the pulverized product. When the vibrating sample feeding means is used, the vibration rate of the nickel powder or the pulverized product is adjusted to adjust the feeding rate and per unit time. It is possible to control the amount of the input, and when controlled by the degree of vibration can be suppressed the oxidation and volatilization of magnesium as much as possible and can increase the dispersibility of the powder or powder in the molten metal, it is possible to achieve uniformity of melting. If the nickel powder or the pulverized product is added rapidly, it may be rapidly combined with magnesium, and the reaction may be actively performed. As a result, the loss of magnesium may increase. Therefore, it is preferable to keep the dosage and the feeding rate for the unit time as small and as slow as possible. .

Along with this, the molten metal is stirred in the manufacturing process of the molten metal using magnesium or magnesium alloy and subsequent alloy manufacturing process, which is also a very important factor in the stirring speed. That is, it is very important to slowly control the stirring speed in order to prevent the oxidation and loss of the highly reactive magnesium in the molten magnesium or magnesium alloy. In this embodiment, the induction motor was operated with a stirring strength of 5 to 150 kPa at a solid phase rate of 0.1 to 0.9 to perform stirring.

Thereafter, the slag may be separated by raising the temperature of the magnesium-nickel melt to 800 ° C. or more to remove impurities contained in the magnesium alloy and the like, and maintaining the mixture for about 10 to 30 minutes without stirring.

As such, the magnesium-nickel mother alloy may be manufactured by cooling the molten magnesium-nickel molten slag, wherein the magnesium-nickel mother alloy ingot (ingot) is cooled by cooling the temperature of the molten slag separated to about 800 ° C. ) Can also be cast. However, such a casting temperature is not limited to the above temperature, it is obvious that it can be changed.

The cast master alloy ingot as described above may be further ground to be used in the alloy manufacturing process of the second step.

In this case, nickel should be used in powder or pulverized powder. Nickel in powder or pulverized powder can increase the reactivity compared to monolithic nickel. It is possible, therefore, to significantly suppress oxidation or volatilization than when magnesium or magnesium alloy is melted at a high temperature. In this regard, the introduction of the master alloy manufacturing process in one step in the manufacture of magnesium-based alloy is very significant, and forms the core technical idea of the present invention.

On the other hand, nickel should be used in the form of powder or pulverized powder, which is mainly used to easily prepare a nickel melt when preparing a one-stage master alloy, so Ni Powder, Ni-Ingot, NiO-Matte, Ni-Matte, NiO You can use Scrap, Ni Scrap, Ni Granule, etc. dT. In the case of nickel powder, the difference in melting time occurs depending on the size of the powder, but if the powder is too fine, loss due to oxidation, volatilization and gas flow occurs, so it is appropriate to use a powder having a particle size of 256 mesh or more. It is desirable to use granules of the same size.

<Manufacturing Two Stage Magnesium Alloy>

Apart from the production of the master alloy as described above, while maintaining a vacuum or protective gas atmosphere, nickel raw materials such as nickel briquettes, nickel ingots and nickel powders and carbon corresponding to about 2% of the total weight of nickel are added to the molten nickel Was prepared.

Here, the carbon can be adjusted in the range of 1 to 10% by weight, by adding carbon, it is possible to lower the melting point of nickel, and by adding 2wt% of carbon, the melting point is lowered from 1455 ° C to 1316 ° C, and more Nickel can be efficiently melted at low temperatures, and the higher the temperature, the more reactive magnesium can be added at a lower loss rate. That is, carbon is added to lower the melting point of the metal used as the base during alloy production, or carbon corresponding to the carbon composition satisfying the purpose of the final desired alloy is added. In this respect, the weight range of the carbon is of critical significance.

Thereafter, the inside of the melting furnace is maintained in a vacuum state to form a protective gas (SF6, R134a, etc.) atmosphere, and nickel and carbon are heated to about 1400 ° C. to prepare a molten nickel.

Here, the heating temperature can be maintained in the range of 1300 ~ 1500 ℃, if the lower limit is not preferred because the molten state of nickel is not complete, if the deviation is outside the upper limit may accelerate the volatilization of magnesium In the heating temperature range as described above, it has a critical significance.

Thereafter, the molten nickel molten metal may be slowly stirred by using a stirrer capable of controlling the speed, thereby suppressing volatilization of magnesium. Vibrating sample feeding means (Vibrating feeding conveyor) capable of adjusting the rate of grinding the magnesium-nickel master alloy ingot manufactured in the first stage master alloy manufacturing process under a protective gas atmosphere such as SF6 and R134a while stirring the molten nickel with the stirrer The molten master alloy is melted by slow addition while minimizing oxidation and volatilization of the molten magnesium.

Then, the final magnesium-nickel alloy is prepared by cooling the molten master alloy and the molten nickel as described above.

However, the magnesium-nickel alloy molten metal may be cooled to about 1100 ° C., and the magnesium-nickel alloy may be cast in an ingot form under an inert gas atmosphere such as Ar.

In addition, as described above, Ag, Al, B, Bi, C to improve the mechanical properties through the improvement of the corrosion resistance of the desired alloy or by refining grains prior to manufacturing the nickel molten metal as in the case of manufacturing the master alloy , Ca, Cu, La, Mn, Nb, Pb, Si, Ti, Sr, Ba Sc, Y, Ce, Pr, Pm, Sm, Ea, Gd, Dy, Tb, Ho Er, Tm and Yb Add one more.

The morphology of the two-stage magnesium alloy according to the present invention is shown as in FIG. 3, and as shown, it can be seen that plate-like Ni and spherical Mg ₂ Ni are observed at the Mg matrix. Here, Mg ₂ Ni and plate-shaped Ni are dispersed evenly.

<Alloy manufacturing apparatus>

The alloy manufacturing apparatus according to the present invention is located around a crucible used for molten metal to melt magnesium, magnesium alloy, nickel, and the like, a heat supply means for supplying heat to the melting furnace, and oxidation of magnesium molten metal in the crucible during melting. And a vacuum pump and a gas mixing unit capable of controlling a protective gas and a vacuum atmosphere for suppressing volatilization, a stirring apparatus capable of adjusting the speed, and an upper portion of the crucible where the crucible is located. Powder container for storing and putting alloy elements, Vibrating feeding conveyor for adjusting feeding speed and input amount by vibrating according to the target mixing composition, mother alloy, A vacuum chamber in which dissolution and coagulation of the final magnesium alloy, etc. occur, and the front of the vacuum chamber is for observing the inside of the vacuum chamber. End is located in the lower part of the device configuration of the molten metal produced in the vacuum chamber to the casting apparatus capable of casting a Ingot form.

The manufacturing apparatus for manufacturing the magnesium-based alloy of the present invention is shown in Figure 1, when divided into this. The following serial numbers are used as reference numerals.

1.Dryer (Pre Warming Box)

Using this dryer, starting materials such as magnesium or magnesium alloy are heated to about 200 ° C. and dried. Here, the drying temperature is not limited to the above temperature, and of course, it can be varied depending on the moisture state, the material to be dried.

2. Melting Furnace

The melting furnace according to the present invention is an apparatus for manufacturing a master alloy and a final alloy, which is an induction melting furnace equipped with three or more stages of heating sections. Temperature control was made possible.

3. Crucible

The crucible according to the present invention is low in carbon content less than 0.12% of magnesium and low reactivity, stainless steel (Ni SUS430, etc.), cast steel (SC-based), clad (Clad), silica (SiO ₂ ) without Ni component It is preferable to use a crucible made of ceramic or cemented carbide.

4. Vibrating Feeding Conveyor

Vibration sample supply apparatus according to the present invention is a raw material and alloy element supply device capable of inputting raw materials by controlling the input speed to suppress the oxidation and volatilization of magnesium, and to adjust the input amount and the input speed per unit time to the molten metal.

5. Powder Container

Powder container according to the present invention can be heated to remove moisture and block the influence of the external environment on the dried powder.

6. Casting Unit

Casting facilities according to the present invention is a device for casting ingots of the master alloy or the final magnesium alloy in a protective gas atmosphere.

7. Stirrer

The stirrer according to the present invention is a molten metal stirrer capable of controlling the stirring speed in view of the very high reactivity of magnesium.

8. Gas Cylinder

Gas container according to the present invention is a device for supplying a protective gas and an inert gas in the furnace in order to suppress the oxidation and volatilization of magnesium.

9. Vacuum Pump

Vacuum pump according to the present invention is a device capable of controlling the degree of vacuum in the furnace in a vacuum atmosphere of 10 ^-4 Torr ~ 50 Torr.

10. Gas Mixing Unit

The gas mixer according to the present invention is a device for supplying the protective gas to the furnace by mixing the protective gas at the target mixing ratio through the flow rate control.

Claims (15)

Melting at least one selected from magnesium or a magnesium-based alloy;
Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy;
Preparing a magnesium mother alloy by cooling an alloy of at least one selected from the molten magnesium or magnesium-based alloys and powders or pulverized products of nickel, titanium, silicon or boron;
Melting nickel, titanium, silicon or boron; And
Preparing a magnesium-based alloy by adding a ground magnesium master alloy to the molten nickel, titanium, silicon or boron;
, &Lt; / RTI &gt;
Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy;
Powder or pulverized powder of nickel, titanium, silicon or boron by adding at the time of melting at least one selected from the molten magnesium or magnesium-based alloy while maintaining the melting temperature of the powder or pulverized powder of nickel, titanium, silicon or boron Or by adding a powder or pulverized powder of nickel, titanium, silicon or boron, and then raising the powder or pulverized powder of nickel, titanium, silicon or boron to a melting temperature of the powder or pulverized powder of nickel, titanium, silicon or boron. Method for producing a magnesium-nickel alloy, characterized in that to melt. delete The method of claim 1,
In the case of the nickel powder or pulverized in the step of further melting by adding a powder or a pulverized powder of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy,
After melting at least one selected from the group consisting of magnesium or magnesium alloy, the melting temperature is 600 to 750 ° C., and then nickel powder or pulverized product is added and the temperature is raised to 750 to 800 ° C. to melt the nickel powder or pulverized product. Or melting the nickel powder or pulverized product by maintaining a melting temperature of at least one selected from the magnesium or magnesium-based alloy at 750 to 800 ° C. such that the nickel powder or pulverized product can be melted. Method for producing magnesium alloy. The method of claim 1,
The molten magnesium or magnesium-based alloy is further melted by adding a powder or a pulverized powder of nickel, titanium, silicon or boron to at least one selected from the group consisting of molten magnesium or magnesium-based alloy. Or at least one selected from the group consisting of magnesium-based alloys and nickel, titanium, silicon or boron, in which the combined weight of the powder or the pulverized product is 100%, 10 to 70% by weight. The method of claim 1,
Melting at least one selected from the group consisting of magnesium and magnesium-based alloys; Or further melting by adding a powder or a pulverized product of nickel, titanium, silicon, or boron to at least one selected from the molten magnesium or magnesium-based alloy; and at least one flux selected from MgCl ₂ , KCl, and NaCl. Method of producing a magnesium-based alloy, characterized in that further adding. The method of claim 5, wherein
The master alloy and the flux is a powder or a pulverized product, and the powder or the pulverized product or the pulverized product and the flux, the master alloy of the nickel, titanium, silicon or boron are added using a vibrating sample feeding means. Method for producing a magnesium-based alloy. The method of claim 1,
Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; Thereafter, the method of producing a magnesium-based alloy, characterized in that further comprising the step of separating and removing the slag. The method of claim 1,
Further melting by adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy; Thereafter, the step of casting into a magnesium mother alloy ingot, the step of adding a magnesium mother alloy to the molten nickel, titanium, silicon or boron to produce a magnesium-based alloy; Thereafter, the method of manufacturing a magnesium-based alloy comprising the step of casting into a magnesium-based alloy. The method of claim 1,
In the step of melting the nickel, titanium, silicon or boron; when melting the nickel, a method of producing a magnesium-based alloy, characterized in that to add more than 1 to 10% by weight of carbon compared to the total weight of nickel. The method of claim 9,
In the case of melting the nickel, the melting temperature is a method of producing a magnesium-nickel alloy, characterized in that the range of 1300 ~ 1500 ℃. The method of claim 1,
Melting at least one selected from the group consisting of magnesium and magnesium-based alloys; Or further adding a powder or a pulverized product of nickel, titanium, silicon or boron to at least one selected from the molten magnesium or magnesium-based alloy to further melt the powder; Or melting the nickel, titanium, silicon, or boron; Ag, Al, B, Bi, C, Ca, Cu, La, Mn, Nb, Pb, Si, Ti, Sr, Ba Sc, Y, Ce, Pr, Pm, Sm, Ea, Gd, Dy, Tb, Ho Er, Tm and Yb at least any one selected from the method of manufacturing a magnesium alloy. The method of claim 1,
The magnesium-based alloy is
AZ31 magnesium alloy, AZ91D magnesium alloy, mischmetal (mischmetal), Mg-Zr, Mg-Si, Mg-Ca, Mg-CaO The method for producing a magnesium alloy, characterized in that at least one selected from. The method of claim 1,
The melting stages,
The melting steps are prepared in the magnesium-based alloy, characterized in that the SF ₆ , HFC-134a (R-134a), Ar, N ₂ , Ne, CO ₂ , BF ₃ , SO ₂ F ₂ And SO ₄ Atmosphere Way. The method of claim 1,
The crucible selected during melting is low carbon steel with less reactivity to the magnesium or magnesium alloy, less than 0.12% carbon, stainless steel without Ni, cast steel, clad, silica (SiO ₂ ), ceramic, cemented carbide Method for producing a magnesium-based alloy, characterized in that any one selected from the material. delete

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