Vacuum induction melting apparatus for improving purity of high-temperature alloy and method of using same

Abstract

The application provides a vacuum induction melting device for improving the purity of high-temperature alloy base alloy, which comprises an induction coil, a crucible body arranged in the induction coil, a crucible nozzle arranged on one side of the top end of the crucible body, a slag baffle arranged at the joint of the crucible nozzle and the crucible body, and a filtering slag baffle arranged on the top end of the crucible body, wherein a lifting ring structure is arranged on the side of the filtering slag baffle away from the crucible body. The vacuum induction melting device can better remove the floating dross on the surface of the alloy liquid and the inclusions in the alloy liquid before the alloy liquid flows out of the crucible. The filtering slag baffle can be used for multiple cycles by replacing the filter screen and used for on-line melting. The slag baffle arranged between the crucible nozzle and the crucible pouring nozzle can remove the floating dross on the surface of the alloy liquid twice, thereby improving the purity of the alloy. The method can be used to realize the application proportion of the high-temperature alloy return material and reduce the floating dross brought into the alloy by the return material.

Description

Technical Field

[0001] This invention relates to the field of alloy melting technology, and in particular to a vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloys and its usage method. Background Technology

[0002] High-temperature alloys are mainly used in the manufacture of hot-end components for aero-engines and gas turbines. With the continuous improvement of aero-engine performance, the requirements for high-temperature alloy materials are becoming increasingly stringent. Given a fixed target composition, the purity of the master alloy has become a crucial control indicator. Due to factors such as the low purity of raw materials, the use of recycled materials, and repeated rinsing of the crucible by the molten alloy, a significant amount of slag forms on the surface of the molten alloy during the alloy melting process. If this slag is carried into the sluice, it not only easily clogs the filter screen but also increases the inclusion content in the cast master alloy ingot. During the remelting and casting of the master alloy, these inclusions exist in the form of numerous inclusions, severely affecting the yield and performance of the castings. Furthermore, because a special high-vacuum environment needs to be maintained in the furnace during vacuum induction melting, the effective removal of slag from the surface of the molten alloy and inclusions within it presents considerable difficulties. Therefore, effectively removing slag from the surface of the molten alloy and inclusions from it has become an urgent problem to be solved in the preparation of high-temperature alloys through vacuum induction melting. Summary of the Invention

[0003] The purpose of this invention is to overcome and supplement the shortcomings of existing technologies, and to provide a vacuum induction melting device and its method for improving the purity of high-temperature alloy master alloys. During the process of pouring the molten alloy from the crucible, thorough purification of the alloy melt is achieved through a single filtration and slag removal process. The technical solution adopted by this invention is as follows: A vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloys, comprising: an induction coil, a crucible body disposed inside the induction coil, a crucible nozzle disposed on one side of the top of the crucible body, a slag baffle disposed at the connection between the crucible nozzle and the crucible body, a filter slag baffle disposed at the top of the crucible body, and a lifting ring structure disposed on the side of the filter slag baffle away from the crucible body.

[0004] Preferably, in the vacuum induction melting device for improving the purity of high-temperature alloy master alloy, the filter slag remover is installed on the top of the crucible body by a snap-fit.

[0005] Preferably, in the vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloy, a crucible spout is provided on the side of the crucible body near the crucible furnace nozzle, and a slag baffle is provided between the crucible furnace nozzle and the crucible spout.

[0006] Preferably, in the vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloy, the slag baffle plate has a thickness of 20-50 mm, the distance between the lower end of the slag baffle plate and the bottom of the crucible spout and the furnace nozzle forming a plane is 50-200 mm, the upper end of the slag baffle plate extends 50-100 mm above the upper end of the crucible spout and the furnace nozzle, and the included angle θ between the slag baffle plate and the upper surface of the crucible spout is <90°.

[0007] Preferably, in the vacuum induction melting device for improving the purity of high-temperature alloy master alloy, the lifting ring structure includes a refractory plate, a metal plate disposed on the outer surface of the refractory plate, a plurality of grooves equally spaced along the length of the refractory plate, a sheet-like filter screen disposed in the groove, and a lifting ring disposed at the end of the refractory plate away from the sheet-like filter screen.

[0008] Preferably, in the vacuum induction melting device for improving the purity of high-temperature alloy master alloy, the lifting rings are arranged on both sides of the top of the filter slag blocker.

[0009] Preferably, in the vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloy, the porosity of the sheet filter screen is 5-30 ppi.

[0010] A method for using a vacuum induction melting apparatus to improve the purity of high-temperature alloy master alloys, comprising the following steps: S1. During the furnace firing process, the crucible body, the crucible nozzle, and the slag baffle between them are installed and fixed in the induction coil. On the side of the crucible body near the crucible nozzle, a buckle is installed on both sides of the furnace opening at the top of the crucible body in a direction perpendicular to the crucible nozzle. S2. The assembled crucible body, crucible nozzle, slag baffle, and buckle are moved into the vacuum induction furnace together with the induction coil for sintering; S3. Assemble the filter baffle and the lifting ring structure and bake them. After baking, cool them down to 150-200℃ and wait for use. S4. Add the raw materials to the crucible to start the high-temperature alloy master alloy melting. After the alloy melting is completed, use a metal chain to place the filter slag blocker into the upper part of the crucible body through the charging chamber of the vacuum induction furnace and place it in the two buckles on the upper part of the crucible body. Adjust the master alloy melting temperature to 1420-1560℃, and pour the crucible to cast the alloy liquid. S5. After the alloy liquid is poured, while the crucible is still tilted at a large angle, pull the filter slag baffle out of the buckle and take it out of the vacuum induction furnace through the upper feeding chamber. After cooling, replace the filter screen and bake it for the next use.

[0011] Preferably, in the method of using the vacuum induction melting device for improving the purity of high-temperature alloy master alloy, the baking temperature in step S3 is 500-600℃ and the baking time is 2-3h.

[0012] Advantages of this invention: This invention relates to a vacuum induction melting device for improving the purity of high-temperature alloy master alloys. The filter and slag baffle effectively removes slag and inclusions from the alloy molten metal before it flows out of the crucible. The filter and slag baffle can be recycled multiple times by replacing the filter screen and can be used in online melting. A baffle plate located between the crucible nozzle and the crucible pouring nozzle allows for secondary removal of slag from the alloy surface. These two filtration and slag baffles improve the purity of the alloy. This method also allows for the application of high-temperature alloy return materials, reducing slag introduced into the alloy by the return materials. The baffle plate between the crucible nozzle and the crucible pouring nozzle enables stable control of the outflow rate during the alloy molten metal pouring process. Attached Figure Description

[0013] Figure 1 A schematic diagram of the vacuum induction melting device for improving the purity of high-temperature alloy master alloys according to the present invention.

[0014] Figure 2 This is a bottom view of the filter and debris blocker of the present invention.

[0015] Figure 3 This is a front view of the filter and debris blocker of the present invention.

[0016] Figure 4 This is a cross-sectional view of the filter and slag remover of the present invention.

[0017] Figure 5 This is a schematic diagram of the structure of a vacuum induction melting device in the prior art.

[0018] In the figure, 1-crucible body, 11-crucible pouring gate, 2-crucible furnace nozzle, 3-slag baffle plate, 4-clasp, 5-filter slag baffle, 51-lifting ring, 52-metal plate, 53-refractory plate, 54-sheet filter screen, and 6-refractory putty for connecting the crucible pouring gate and the crucible furnace nozzle. Detailed Implementation

[0019] The present invention will be further described below with reference to specific accompanying drawings and embodiments.

[0020] Example 1 like Figure 1-4A vacuum induction melting device for improving the purity of high-temperature alloy master alloy includes an induction coil, a crucible body 1 inside the induction coil, a crucible nozzle 2 on one side of the top of the crucible body 1, a slag baffle 3 at the connection between the crucible nozzle 2 and the crucible body 1, a filter slag baffle 5 at the top of the crucible body 1, and a lifting ring structure on the side of the filter slag baffle 5 away from the crucible body 1.

[0021] The filter slag baffle 5 is installed on the top of the crucible body 1 near the crucible via a snap fastener 4; a crucible pouring nozzle 11 is provided on one side of the furnace nozzle 2, and the slag baffle 3 is positioned between the crucible furnace nozzle 2 and the crucible pouring nozzle 11, with refractory mortar 6 filling and connecting the crucible pouring nozzle 11 and the crucible furnace nozzle 2; the slag baffle 3 is 30mm thick, the distance between the lower end of the slag baffle 3 and the plane formed by the crucible pouring nozzle 11 and the bottom of the crucible furnace nozzle 2 is 100mm, and the upper end of the slag baffle 3 extends 60mm above the upper end of the crucible pouring nozzle 11 and the crucible furnace nozzle 2; the lifting ring structure includes The refractory plate 53 and the metal plate 52 disposed on the outer surface of the refractory plate 53 are provided with multiple grooves at equal intervals along the length of the refractory plate 53. The grooves are provided with sheet-like filter screens 54. The end of the refractory plate 53 away from the sheet-like filter screens 54 is provided with a lifting ring 51. The lifting rings 51 are disposed on both sides of the top of the filter slag blocker 5. The porosity of the sheet-like filter screens 54 is 15 ppi. The two buckles 4 are respectively installed on the upper opening of the crucible body 1 during the furnace firing process. The line connecting the two buckles 4 is perpendicular to the axis of the crucible pouring gate 11 and close to the position of the crucible pouring gate 11.

[0022] The height of the buckle 4 is matched with the thickness of the refractory material plate structure of the metal plate of the slag-blocking filter to ensure that the slag-blocking filter 5 will not lose its slag-blocking function due to overturning during the alloy liquid pouring process. The lifting rings 51 at both ends of the upper surface of the slag-blocking filter 5 are used for lifting and replacing the slag-blocking filter 5. The refractory plate 53 and the sheet filter screen 54 are fixed with refractory mortar and used after sintering.

[0023] The length of the slag baffle 5, the spacing and number of slots on the central axis of the refractory material plate can be adjusted according to the crucible size. The porosity of the sheet filter screen 54 is 15ppi, which can be adjusted according to the content and size of the floating slag on the alloy liquid surface. After use, the slag baffle can be removed from the vacuum induction furnace, cooled, and the filter screen can be replaced for reuse.

[0024] A method for using a vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloys includes the following steps: S1. During the furnace firing process, the crucible body 1, the crucible nozzle 2 and the slag baffle 3 between them are installed and fixed in the induction coil. On the side of the crucible body 1 near the crucible nozzle 11, a buckle 4 is installed on the furnace opening on both sides of the top of the crucible body 1 along the direction perpendicular to the crucible nozzle 2. The opening direction of the buckle 4 is parallel to the axial direction of the gate and away from the gate. S2. The assembled crucible body 1, crucible nozzle 2, slag baffle 3, and buckle 4 are moved into the vacuum induction furnace together with the induction coil for sintering; S3. Assemble the filter baffle 5 and the hanging ring structure and bake them at a temperature of 500℃ for 3 hours. After baking, cool them down to 150℃ and set aside for use. S4. Add the raw materials to the crucible to start the high-temperature alloy master alloy melting. After the alloy melting is completed, use a metal chain to place the filter slag remover into the upper part of the crucible body 1 through the charging chamber of the vacuum induction furnace and place it in the two buckles 4 on the upper part of the crucible body 1. Adjust the master alloy melting temperature to 1480℃, pour the crucible to cast the alloy liquid. The alloy liquid passes through the filter slag remover and the slag plate to remove the floating slag on the surface of the alloy liquid in the crucible body. S5. After the alloy liquid is poured, while the crucible is still tilted at a large angle, pull the filter slag blocker 5 out of the clip 4 and take it out of the vacuum induction furnace through the upper feeding chamber. After cooling, replace the filter screen and bake it for the next use.

[0025] Example 2 like Figure 1-4 A vacuum induction melting device for improving the purity of high-temperature alloy master alloy includes an induction coil, a crucible body 1 inside the induction coil, a crucible nozzle 2 on one side of the top of the crucible body 1, a slag baffle 3 at the connection between the crucible nozzle 2 and the crucible body 1, a filter slag baffle 5 at the top of the crucible body 1, and a lifting ring structure on the side of the filter slag baffle 5 away from the crucible body 1.

[0026] The filter slag baffle 5 is installed on the top of the crucible body 1 near the crucible via a snap fastener 4; a crucible pouring nozzle 11 is provided on one side of the furnace nozzle 2, and the slag baffle 3 is positioned between the crucible furnace nozzle 2 and the crucible pouring nozzle 11, with refractory mortar 6 filling and connecting the crucible pouring nozzle 11 and the crucible furnace nozzle 2; the slag baffle 3 is 30mm thick, the distance between the lower end of the slag baffle 3 and the plane formed by the crucible pouring nozzle 11 and the bottom of the crucible furnace nozzle 2 is 100mm, and the upper end of the slag baffle 3 extends 60mm above the upper end of the crucible pouring nozzle 11 and the crucible furnace nozzle 2; the lifting ring structure includes The refractory plate 53 and the metal plate 52 disposed on the outer surface of the refractory plate 53 are provided with multiple grooves at equal intervals along the length of the refractory plate 53. The grooves are provided with sheet-like filter screens 54. The end of the refractory plate 53 away from the sheet-like filter screens 54 is provided with a lifting ring 51. The lifting rings 51 are disposed on both sides of the top of the filter slag blocker 5. The porosity of the sheet-like filter screens 54 is 20 ppi. The two buckles 4 are respectively installed on the upper opening of the crucible body 1 during the furnace firing process. The line connecting the two buckles 4 is perpendicular to the axis of the crucible pouring gate 11 and close to the position of the crucible pouring gate 11.

[0027] The height of the buckle 4 is matched with the thickness of the refractory material plate structure of the metal plate of the slag-blocking filter to ensure that the slag-blocking filter 5 will not lose its slag-blocking function due to overturning during the alloy liquid pouring process. The lifting rings 51 at both ends of the upper surface of the slag-blocking filter 5 are used for lifting and replacing the slag-blocking filter 5. The refractory plate 53 and the sheet filter screen 54 are fixed with refractory mortar and used after sintering.

[0028] The length of the slag baffle 5, the spacing and number of slots on the central axis of the refractory material plate can be adjusted according to the crucible size. The porosity of the sheet filter screen 54 is 15ppm, which can be adjusted according to the content and size of the slag on the alloy liquid surface. After use, the slag baffle can be removed from the vacuum induction furnace, cooled, and the filter screen can be replaced for reuse.

[0029] A method for using a vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloys includes the following steps: S1. During the furnace firing process, the crucible body 1, the crucible nozzle 2 and the slag baffle 3 between them are installed and fixed in the induction coil. On the side of the crucible body 1 near the crucible nozzle 11, a buckle 4 is installed on the furnace opening on both sides of the top of the crucible body 1 along the direction perpendicular to the crucible nozzle 2. The opening direction of the buckle 4 is parallel to the axial direction of the gate and away from the gate. S2. The assembled crucible body 1, crucible nozzle 2, slag baffle 3, and buckle 4 are moved into the vacuum induction furnace together with the induction coil for sintering; S3. Assemble the filter baffle 5 and the hanging ring structure and bake them at a temperature of 600℃ for 2 hours. After baking, cool them down to 180℃ and set aside for use. S4. Add the raw materials to the crucible to start the high-temperature alloy master alloy melting. After the alloy melting is completed, use a metal chain to place the filter slag remover into the upper part of the crucible body 1 through the charging chamber of the vacuum induction furnace and place it in the two buckles 4 on the upper part of the crucible body 1. Adjust the master alloy melting temperature to 1470℃, pour the crucible to cast the alloy liquid. The alloy liquid passes through the filter slag remover and the slag plate to remove the floating slag on the surface of the alloy liquid in the crucible body. S5. After the alloy liquid is poured, while the crucible is still tilted at a large angle, pull the filter slag blocker 5 out of the clip 4 and take it out of the vacuum induction furnace through the upper feeding chamber. After cooling, replace the filter screen and bake it for the next use.

[0030] Comparative Example 1 Figure 5 This is a schematic diagram of the structure of a conventional vacuum induction melting device, including a crucible body 1 and a crucible nozzle 2.

[0031] The existing method of using vacuum induction melting equipment includes the following steps: (1) During the furnace firing process, the crucible and crucible nozzle are installed and fixed in the induction coil; (2) The assembled crucible and crucible nozzle are moved into the vacuum induction furnace together with the induction coil for sintering; (3) After sintering, the raw materials are added to the crucible to start the high-temperature alloy master alloy melting. After the alloy melting is completed, the master alloy melting temperature is adjusted to 1480℃, the crucible is poured out, and the alloy liquid is poured through the crucible spout.

[0032] The inclusion content in the master alloy ingots prepared using Examples 1-2 was detected and compared with the inclusion content in the master alloy ingots prepared using the conventional vacuum induction melting apparatus in Comparative Example 1. The results are shown in Table 1.

[0033] Table 1 Comparison of the master alloy ingots obtained in Examples 1-2 and Comparative Example 1 .

[0034] The test results of Examples 1-2 and Comparative Example 1 show that by using the vacuum induction melting device of the present invention to improve the purity of high-temperature alloy master alloy, the slag on the surface of the alloy liquid in the crucible can be effectively removed, greatly reducing the inclusions in the prepared master alloy ingot, and also reducing the risk of the alloy liquid clogging the filter screen after entering the chute.

[0035] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vacuum induction melting apparatus for improving the purity of a superalloy master alloy, characterized by: The system includes an induction coil, a crucible body (1) is provided inside the induction coil, a crucible nozzle (2) is provided on one side of the top of the crucible body (1), a slag baffle (3) is provided at the connection between the crucible nozzle (2) and the crucible body (1), a filter slag baffle (5) is also provided at the top of the crucible body (1), and a hanging ring structure is provided on the side of the filter slag baffle (5) away from the crucible body (1). The lifting ring structure includes a fire-resistant plate (53), a metal plate (52) disposed on the outer surface of the fire-resistant plate (53), and multiple grooves are equally spaced along the length of the fire-resistant plate (53). A sheet-like filter screen (54) is disposed in the groove, and a lifting ring (51) is disposed at the end of the fire-resistant plate (53) away from the sheet-like filter screen (54).

2. The vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloys as described in claim 1, characterized in that: The filter slag blocker (5) is installed on the top of the crucible body (1) by a snap fastener (4).

3. The apparatus for vacuum induction melting for improving the purity of superalloy master alloy of claim 1, wherein: The crucible body (1) is provided with a crucible spout (11) on the side near the crucible furnace nozzle (2), and the slag baffle (3) is provided between the crucible furnace nozzle (2) and the crucible spout (11).

4. The apparatus for vacuum induction melting for improving the purity of superalloy master alloy according to claim 3, wherein: The thickness of the slag baffle (3) is 20-50mm. The distance between the lower end of the slag baffle (3) and the bottom of the crucible spout (11) and the crucible furnace spout (2) forming a plane is 50-200mm. The upper end of the slag baffle (3) is 50-100mm higher than the upper end of the crucible spout (11) and the crucible furnace spout (2). The included angle θ between the slag baffle and the upper surface of the crucible spout is <90°.

5. The apparatus for vacuum induction melting for improving the purity of superalloy master alloy of claim 1, wherein: The lifting rings (51) are located on both sides of the top of the filter blocker (5).

6. The apparatus for vacuum induction melting for improving the purity of superalloy master alloy of claim 1, wherein: The porosity of the sheet filter (54) is 5-30 ppi.

7. A method of using a vacuum induction melting apparatus for improving the purity of a superalloy master alloy as claimed in any one of claims 1 to 6, wherein: Includes the following steps: S1. During the furnace firing process, the crucible body (1), the crucible nozzle (2) and the baffle plate (3) between them are installed and fixed in the induction coil. On the side of the crucible body (1) near the crucible spout (11), a buckle (4) is installed on the furnace openings on both sides of the top of the crucible body (1) in a direction perpendicular to the crucible nozzle (2). S2. Place the assembled crucible body (1), crucible nozzle (2), slag baffle (3), and buckle (4) into the vacuum induction furnace along with the induction coil for sintering; S3. Assemble the filter baffle (5) and the hanging ring structure and bake them. After baking, cool them down to 150-200℃ and wait for use. S4. Add the raw materials into the crucible to start the high-temperature alloy master alloy melting. After the alloy melting is completed, use a metal chain to put the filter slag blocker into the upper part of the crucible body (1) through the charging chamber of the vacuum induction furnace and place it in the two buckles (4) on the upper part of the crucible body (1). Adjust the master alloy melting temperature to 1420-1560℃, pour the crucible and cast the alloy liquid. S5. After the alloy liquid is poured, while the crucible is still tilted at a large angle, pull the filter slag blocker (5) out of the buckle (4) and take it out of the vacuum induction furnace through the upper feeding chamber. After cooling, replace the filter screen and bake it for the next use.

8. The method of using the vacuum induction melting apparatus for improving the purity of high-temperature alloy master alloy as described in claim 7, characterized in that: The baking temperature in step S3 is 500-600℃, and the baking time is 2-3 hours.

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