CN111471881B - Powder metallurgy forming process for melting aluminum-iron alloy in multiple times - Google Patents
Powder metallurgy forming process for melting aluminum-iron alloy in multiple times Download PDFInfo
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- CN111471881B CN111471881B CN202010396114.8A CN202010396114A CN111471881B CN 111471881 B CN111471881 B CN 111471881B CN 202010396114 A CN202010396114 A CN 202010396114A CN 111471881 B CN111471881 B CN 111471881B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0848—Melting process before atomisation
Abstract
The invention discloses a powder metallurgy forming process for melting aluminum-iron alloy in multiple times, wherein a part of aluminum or a part of two main components of aluminum and iron is made into an aluminum bar, and the minor components and the rest of aluminum or aluminum-iron are mixed and poured into an alloy bar together with the made aluminum bar. And forming liquid drops at the bottom end of the alloy rod by using high-frequency induction heating. The aluminum bar is internally provided with an axial through hole, and the liquid drop is formed and simultaneously blown into or onto the liquid drop. The position of the air blowing is in a vacuum collecting tank, and the air can expand under the vacuum environment to burst liquid drops to form uniform metal powder particles. And finally, performing secondary smelting by utilizing alloy powder particles with basically uniform components. The secondary smelting has basically uniform components, more sufficient stirring, high yield and stable quality. Each link has stronger controllability, the parameters or components are adjusted in time, and the equipment is adaptive more quickly. Is more beneficial to producing high-quality products.
Description
Technical Field
The invention relates to a smelting process of aluminum-iron alloy, in particular to a process for smelting aluminum-iron alloy and forming powder metallurgy in a grading manner.
Background
In the first part, during powder metallurgy, large and small component metals are melted in the same container and then stirred, so that the components are uniformly mixed as much as possible, and the occurrence of obvious segregation is avoided.
In the second part, the specific process of powder metallurgy is to melt and stir, then make the molten metal into metal powder, and then melt and press the powder into the required metal block or other shapes.
However, in the process of implementing the technical solution of the invention in the embodiments of the present application, the inventors of the present application find that the above-mentioned technology has at least the following technical problems:
the alloy contains more than a few minor component metals, 1-5 components or a plurality of minor component metals. However, the total amount of aluminum is large and the amount per shot is generally large in order to improve the stability of the alloy composition. Thus, the single melting amount is large, the components are difficult to ensure to be uniform, and the segregation condition is often generated. Often requiring long melting and stirring times. And all components are melted together, for smelting, a plurality of dimensions need to be controlled, the components are uniform, segregation is avoided, the melt temperature and the like, indexes influencing the final quality need to be considered, comprehensive consideration is needed, and the final selection is often a result of compromise. The controllability of the final product is very low.
A large amount of molten metal is atomized subsequently, the atomization process is relatively slow, the uniformity of the molten metal needs to be controlled finely, and the consistency of metal components is kept all the time through temperature and stirring. However, the molten metal is gradually reduced, the control of the heating equipment and the stirring equipment needs to be continuously adjusted, the production difficulty is improved, and the loss of the equipment is increased.
In addition, if the gas atomization device used in powder metallurgy is a metal powder atomization device specially used for powder metallurgy or 3D printing, the gas flow rate is high, the device is precise, the production cost is high, and the gas atomization device is not suitable for raw material manufacturers. Therefore, the atomization device is usually used to blow off only the metal droplets, but the metal powder particles have a large number of large particles and are not uniform, which is very disadvantageous for subsequent melt pressing into a block or other shapes. The air inside the furnace is much, so that the furnace is difficult to discharge, and oxidation may occur due to heating. The melting time and the required pressure are also longer and the costs are higher.
Disclosure of Invention
The embodiment of the application solves the technical problem which can be solved by the exclusive rights in the prior art by providing the powder metallurgy forming process for melting the aluminum-iron alloy in multiple times, reduces the requirements on each production link, has higher controllability, and improves the stability and the yield of the product quality.
The embodiment of the application provides a powder metallurgy forming process for melting aluminum-iron alloy in multiple times, which comprises the following steps,
1) preparation of aluminum bars
Calculating the aluminum consumption required by single powder metallurgy, using 50-100% of all aluminum components, melting, and casting into a cylinder with a coaxial through hole with a diameter of 0.5-1.5 mm;
2) smelting of small components
Melting the components except aluminum in the alloy and the rest aluminum which is not made into the aluminum bar in the step 1) in a crucible at a temperature 10-50 ℃ higher than the melting point, and electromagnetically stirring for 10-20 min;
3) preparation of alloy bars
Placing the aluminum bar into an alloy casting mold, wherein the inner cavity of the alloy casting mold is cylindrical and coaxial with the aluminum bar, and a space formed between the outer cylindrical surface of the aluminum bar and the mold is used for casting small-component molten metal in the step 2);
4) preparation of alloy rod powder
A conveying box is used, the opening at the bottom end is hermetically communicated with the top end of the collecting tank, a sealing plate is fixed at the communicated position, a through hole is formed in the center of the sealing plate, and the diameter of the through hole is 2-3mm larger than that of the alloy rod;
clamping the alloy bar on the conveying roller set, and enabling the alloy bar to move downwards at a constant speed, wherein the alloy bar is coaxial with the through hole in the center of the sealing plate;
the top end of a coaxial through hole in the alloy rod is communicated with a connecting pipe, the other end of the connecting pipe is communicated with a hose, and the other end of the hose extends out of the conveying box and is communicated with an inert gas source;
a second induction heating ring is fixed on the top of the collecting tank, and the second induction heating ring rapidly melts the alloy rod inside and outside to form liquid drops;
introducing inert gas into the liquid through a hose and a connecting pipe, wherein the gas flow rate is 30-180m/s, and the gas inflow is 1-5 times of the volume of the formed melt;
the air pressure in the collecting tank is always kept at 0.1-0.3 atmospheric pressure.
5) Secondary smelting
Melting the master alloy powder obtained in the step 4) and keeping the temperature above the melting point by 10-20 ℃, electromagnetically stirring for 5-15min, and then casting and molding.
Further, step 4) fixed first induction heating ring in transport case bottom, when the alloy stick marchd and get into first induction heating intra-annular, preheat the alloy stick to 600 degrees centigrade to get into in the collection tank through the closing plate.
Further, in the step 1), when the iron component accounts for more than 35%, 30-60% of all iron components are smelted together with aluminum; meanwhile, in the step 2), the minor components are smelted, all the rest iron components are used, and aluminum accounts for 11-24% of the minor component smelting.
Further, the iron component accounts for 37% of the alloy, and 33% of the iron component and 86% of the aluminum component are smelted together in the step 1); meanwhile, the small components in the step 2) are smelted together by using all the rest iron components and 14 percent of aluminum components as well as other components.
Further, in the step 4), the air intake is interval air intake, according to the frequency of the formed liquid, when the liquid drops are formed to 1/4-3/4 of the volume of the final drop, inert gas is introduced into the liquid through a hose and a connecting pipe, the ventilation amount is 1-5 times of the formed liquid amount, and the flow rate of the gas flow is 50-180 m/s;
furthermore, the bottom end of the alloy rod is in an inverted frustum shape, and the cone angle is 70-150 degrees.
Further, the bottom end of the alloy rod is in an inverted frustum shape, the taper angle is 86 degrees, the flow speed of the air inlet flow in the step 4) is 63m/s, the air inlet is interval air inlet, according to the frequency of formed liquid, when liquid drops are formed to 1/4 of the volume of the final dropping time, inert gas is introduced into the liquid through the hose and the connecting pipe, and the air flow is 1.8 times of the amount of the formed liquid.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. due to the adoption of secondary smelting and vacuum gas explosion atomization, indexes to be finished in each link are different and are easier to control, and further, the effects that the indexes of each link of alloy production are controllable and the final quality is controllable are realized.
2. And the secondary smelting is easier to fully and uniformly distribute the small components, and the small components are more uniformly distributed compared with the small components directly stirred in the large components.
3. And (3) vacuum explosion, inflation in a vacuum environment, and explosion of the molten metal by utilizing the vacuum environment, wherein the shape and the particle size of the metal powder particles are more uniform.
4. The final melting can be completed by only short melting and stirring time under the condition that the metal powder is basically uniform. The components are uniform, and segregation hardly occurs.
Drawings
FIG. 1 is a schematic view of the structure of the production equipment of the present application.
FIG. 2 is a schematic drawing of alloy bar casting.
In the figure, a conveying box 10, a connecting pipe 11, a hose 12, a winding cylinder 13, a conveying roller group 14, an alloy rod 20, a first induction heating ring 30, a second induction heating ring 40, a collecting tank 50, a baffle ring 51 and an air suction pipe 52 are arranged.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to avoid the problems that the stirring is not uniform due to small components, the stirring is not easy to be sufficient, the particle size of the atomized metal powder is not uniform, large particles are more, the controllable degree of a smelting link and an atomizing link is lower, the yield is not high, or high-quality products are difficult to produce.
A part of the main component of aluminum or a part of the two main components of aluminum and iron is made into an aluminum bar, and the minor components are mixed with the rest of aluminum or aluminum and iron and cast with the aluminum bar to form an alloy bar. And forming liquid drops at the bottom end of the alloy rod by using high-frequency induction heating. The aluminum bar is internally provided with an axial through hole, and the liquid drop is formed and simultaneously blown into or onto the liquid drop. The position of the air blowing is in a vacuum collecting tank, and the air can expand under the vacuum environment to burst liquid drops to form uniform metal powder particles. And finally, performing secondary smelting by utilizing alloy powder particles with basically uniform components. The secondary smelting has basically uniform components, more sufficient stirring, high yield and stable quality. Each link has stronger controllability, the parameters or components are adjusted in time, and the equipment is adaptive more quickly. Is more beneficial to producing high-quality products.
Especially, small or trace components such as carbon, silicon and the like are easy to be uniformly distributed because the total amount is small when the small components are smelted. After the alloy bar is melted and powdered, the alloy bar is uniformly adhered with large-component aluminum or aluminum iron or forms a melt. Thus, the entire composition is substantially uniformly distributed and is uniformly distributed in a cured state. After melting, stirring for a short time is sufficiently and uniformly distributed, and after rapid stirring, the possibility of segregation is reduced. Therefore, the final finished product has stable and controllable quality, and can be produced more flexibly and controllably by production enterprises.
Example one
A powder metallurgy forming process for melting aluminum-iron alloy in multiple times comprises the following steps,
1) preparation of aluminum bars
Calculating the aluminum consumption required by single powder metallurgy, using 50-100% of all aluminum components, melting, and casting into a cylinder with a coaxial through hole with a diameter of 0.5-1.5 mm;
the cylindrical aluminum bar is convenient for uniform melting, and the uniformity of the size is a prerequisite for ensuring the uniformity of the components of the subsequent metal powder. The through holes are to facilitate subsequent venting.
2) Smelting of small components
Melting the components except aluminum in the alloy and the rest aluminum which is not made into the aluminum bar in the step 1) in a crucible at a temperature 10-50 ℃ higher than the melting point, and electromagnetically stirring for 10-20 min;
when the small components are smelted, the components are preferably added step by step, and the components are added sequentially from large to small, smelted and stirred.
3) Preparation of alloy bars
Placing the aluminum bar into an alloy casting mold, wherein the inner cavity of the alloy casting mold is cylindrical and coaxial with the aluminum bar, and a space formed between the outer cylindrical surface of the aluminum bar and the mold is used for casting small-component molten metal in the step 2);
the molten metal with small components is cast outside the aluminum bar, and because the melting point of aluminum is lower and the melting point of iron is high, partial aluminum or aluminum iron can be melted outside the aluminum bar to form an alloy bar with tight bonding.
The diameter of the final alloy rod is 3-8cm, although it can be in the range depending on the production, especially the high-frequency induction melting equipment. The thickness of the alloy layer may also vary depending on the capabilities of the heating apparatus. 0.5-2cm are all selectable ranges.
4) Preparation of alloy rod powder
A conveying box 10 is used, the opening at the bottom end is hermetically communicated with the top end of the collecting tank, a sealing plate is fixed at the communicated position, a through hole is formed in the center of the sealing plate, and the diameter of the through hole is 2-3mm larger than that of the alloy rod 20;
clamping the alloy rod 20 on the conveying roller group 14, and enabling the alloy rod 20 to move downwards at a constant speed, wherein the alloy rod 20 is coaxial with the through hole in the center of the sealing plate;
the top end of a coaxial through hole in the alloy rod 20 is communicated with a connecting pipe 11, the other end of the connecting pipe 11 is communicated with a hose 12, and the other end of the hose 12 extends out of the conveying box 10 and is communicated with an inert gas source;
the second induction heating ring 40 is fixed at the top of the collecting tank 50, and the second induction heating ring 40 rapidly melts the alloy rod inside and outside to form liquid drops;
introducing inert gas into the liquid through a hose and a connecting pipe, wherein the gas flow rate is 30-180m/s, and the gas inflow is 1-5 times of the volume of the formed melt;
the air pressure in the collection tank 50 is always maintained at 0.1-0.3 atmosphere.
5) Secondary smelting
Melting the master alloy powder obtained in the step 4) and keeping the temperature above the melting point by 10-20 ℃, electromagnetically stirring for 5-15min, and then casting and molding.
Through the steps, smelting is divided into three times, atomization is only used in a stable and uniformly distributed state, and vacuum aeration is utilized, so that grinding is more uniform. Thus, each link only fulfills a part of the requirements. The whole alloy production is gradually promoted, the requirements of each link are reduced, and each link is convenient to control. Finally, the alloy with uniform and stable components and less deviation can be rapidly smelted.
The finished product rate actually has various standards, and the finished product rate is completely rooted and is also controllable by various indexes, so that the finished product can be controlled. The key indexes are the probability and degree of segregation, and the probability of segregation or the degree of segregation can be effectively controlled by controlling the link.
Example two
The melting point of aluminum is much lower than that of iron or aluminum-iron alloy, and in order to melt the alloy bar quickly, the alloy bar is preheated at a temperature lower than that of aluminum. Then the alloy layer and the inner aluminum bar are rapidly melted together by rapid heating. The aluminum bar melting furnace avoids the problem that when a single heating device is used for heating, the heating time is long, so that the inner aluminum bar is firstly melted, and the outer alloy layer is later melted. After preheating, the inner layer and the outer layer can be rapidly melted together, so that the components are more uniform.
Therefore, the first induction heating ring 30 is fixed at the bottom of the transfer box 10 in the step 4), and the alloy rod 20 is preheated to 600 degrees celsius and enters the collection tank 50 through the sealing plate while the alloy rod 20 travels into the first induction heating ring 30.
EXAMPLE III
In order to further reduce the difference of the melting points of the inner and outer layers, in the step 1), when the iron component accounts for more than 35%, 30-60% of all the iron components are smelted together with aluminum; meanwhile, in the step 2), the minor components are smelted, all the rest iron components are used, and aluminum accounts for 11-24% of the minor component smelting. Therefore, the inner and outer melting points are more consistent, and the molten metal droplets are more uniform in components and are faster and controllable.
Example four
The iron component accounts for 37% of the alloy, and 33% of the iron component and 86% of the aluminum component are smelted together in the step 1); meanwhile, the small components in the step 2) are smelted together by using all the rest iron components and 14 percent of aluminum components as well as other components.
Example 5
The air intake can be constant speed, long time air intake, interval air intake or pulse air intake. The interval air intake is to match the formation of molten liquid drops, and the air is filled into the liquid drops as much as possible, so that the metal powder with uniform particles and even uniform appearance can be formed more effectively.
Therefore, in the step 4), the air intake is interval air intake, according to the frequency of forming the liquid, when the liquid drop is formed to 1/4-3/4 of the volume of the final drop, inert gas is introduced into the liquid through the hose and the connecting pipe, the air flow is 1-5 times of the formed liquid volume, and the air flow rate is 50-180 m/s.
Example 6
During melting, a frustum is manufactured at the beginning, so that the melting is convenient and rapid, and when the frustum is also an outer layer, the inner layer of the alloy layer is an aluminum rod. The bottom end of the alloy rod is in an inverted frustum shape, and the cone angle is 70-150 degrees.
Example 7
In actual production, the bottom end of the alloy rod is in an inverted frustum shape, the taper angle is 86 degrees, the flow speed of the air inlet flow in the step 4) is 63m/s, the air inlet is interval air inlet, and according to the frequency of forming liquid, when liquid drops are formed to 1/4 of the volume of the final drop, inert gas is introduced into the liquid through the hose and the connecting pipe, and the air flow is 1.8 times of the amount of the formed liquid.
Through the process, the aluminum-iron alloy block is produced, and after a plurality of batches of secondary production, the segregation situation is basically avoided. And the component detection is carried out on the alloys of different batches, and the content of each component has little deviation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A powder metallurgy forming process for melting aluminum-iron alloy in multiple times is characterized by comprising the following steps,
1) preparation of aluminum bars
Calculating the aluminum consumption required by single powder metallurgy, using 50-100% of all aluminum components, melting, and casting into a cylinder with a coaxial through hole with a diameter of 0.5-1.5 mm;
2) smelting of small components
Melting the components except aluminum in the alloy and the rest aluminum which is not made into the aluminum bar in the step 1) in a crucible at a temperature 10-50 ℃ higher than the melting point, and electromagnetically stirring for 10-20 min;
3) preparation of alloy bars
Placing the aluminum bar into an alloy casting mold, wherein the inner cavity of the alloy casting mold is cylindrical and coaxial with the aluminum bar, and a space formed between the outer cylindrical surface of the aluminum bar and the mold is used for casting small-component molten metal in the step 2);
4) preparation of alloy rod powder
A conveying box is used, the opening at the bottom end is hermetically communicated with the top end of the collecting tank, a sealing plate is fixed at the communicated position, a through hole is formed in the center of the sealing plate, and the diameter of the through hole is 2-3mm larger than that of the alloy rod;
clamping the alloy bar on the conveying roller set, and enabling the alloy bar to move downwards at a constant speed, wherein the alloy bar is coaxial with the through hole in the center of the sealing plate;
the top end of a coaxial through hole in the alloy rod is communicated with a connecting pipe, the other end of the connecting pipe is communicated with a hose, and the other end of the hose extends out of the conveying box and is communicated with an inert gas source;
a second induction heating ring is fixed on the top of the collecting tank, and the second induction heating ring rapidly melts the alloy rod inside and outside to form liquid drops;
introducing inert gas into the liquid through a hose and a connecting pipe, wherein the gas flow rate is 30-180m/s, and the gas inflow is 1-5 times of the volume of the formed melt;
the air pressure in the collecting tank is always kept at 0.1-0.3 atmospheric pressure.
5) Secondary smelting
Melting the master alloy powder obtained in the step 4) and keeping the temperature above the melting point by 10-20 ℃, electromagnetically stirring for 5-15min, and then casting and molding.
2. The aluminum-iron alloy fractional melting powder metallurgy forming process as claimed in claim 1, wherein the first induction heating ring is fixed at the bottom of the conveying box in the step 4), and when the alloy bar advances into the first induction heating ring, the alloy bar is preheated to 600 ℃ and enters the collecting tank through the sealing plate.
3. The fractional melting powder metallurgy forming process of an aluminum-iron alloy according to claim 1, wherein in the step 1), when the iron component accounts for more than 35%, 30-60% of all iron components are melted together with aluminum; meanwhile, in the step 2), the minor components are smelted, all the rest iron components are used, and aluminum accounts for 11-24% of the minor component smelting.
4. The fractional melting powder metallurgy forming process of an aluminum-iron alloy according to claim 3, wherein the iron component in the alloy accounts for 37%, and 33% of the iron component and 86% of the aluminum component are melted together in step 1); meanwhile, the small components in the step 2) are smelted together by using all the rest iron components and 14 percent of aluminum components as well as other components.
5. The fractional melting powder metallurgy forming process of aluminum-iron alloy according to any one of claims 1 to 4, wherein in the step 4), the air inlet is interval air inlet, and according to the frequency of forming liquid, when the liquid drop is formed to 1/4-3/4 of the volume of the final drop, inert gas is introduced into the liquid through the hose and the connecting pipe, the air flow is 1-5 times of the formed liquid volume, and the air flow rate is 50-180 m/s.
6. The fractional melting powder metallurgy forming process for aluminum-iron alloys according to any one of claims 1 to 4, wherein the bottom end of the alloy rod is in an inverted frustum shape, and the taper angle is 70-150 degrees.
7. The fractional melting powder metallurgy forming process of an aluminum-iron alloy according to any one of claim 4, wherein the bottom end of the alloy rod is in a shape of an inverted frustum, the taper angle is 86 degrees, the flow rate of the gas inlet flow in the step 4) is 63m/s, the gas inlet is interval gas inlet, and according to the frequency of formed liquid, when liquid drops are formed to 1/4 of the volume of the final drop, inert gas is introduced into the liquid through a hose and a connecting pipe, and the gas inlet amount is 1.8 times of the amount of the formed liquid.
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| CN111036927A (en) * | 2019-12-25 | 2020-04-21 | 陕西斯瑞新材料股份有限公司 | Method for preparing GRCop-84 spherical powder based on VIGA process |
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