A high-entropy ceramic-bonded cemented carbide and its preparation method

Abstract

This invention discloses a high-entropy ceramic-bonded cemented carbide and its preparation method, relating to the field of cemented carbide technology. The cemented carbide, by mass percentage, comprises the following components: Ti powder, W powder, C powder, Ni powder, Cr powder, and Mo powder. Ti accounts for 2% of the total mass, W accounts for 80%, C accounts for 3.5%, Ni accounts for 0.5%, Cr accounts for 12%, and Mo accounts for 2%. The preparation method of this high-entropy ceramic-bonded cemented carbide includes a mixer. The mixer of this invention, through an intermittent rotation component, can intermittently rotate the mixing tank during powder mixing, causing the mixing tank to continuously rotate intermittently. During rotation, the powder inside is continuously rotated, thereby avoiding dead zones and uneven mixing.

Description

Technical Field

[0001] This invention relates to the field of cemented carbide technology, specifically to a high-entropy ceramic-bonded cemented carbide and its preparation method. Background Technology

[0002] High entropy alloys (HEAs) are alloys composed of five or more metals in equal or approximately equal amounts. Due to their potential for many desirable properties, HEAs are highly valued in materials science and engineering. Traditional alloys typically contain only one or two main metallic components. For example, they might be based on iron, with trace amounts of other elements added to enhance their properties, resulting in iron-based alloys. Historically, the more types of metals added to an alloy, the more brittle it would become. However, HEAs differ from traditional alloys; they contain multiple metals without becoming brittle, representing a new type of material.

[0003] In the preparation of high-entropy alloys, powder mixing equipment is required to mix the powders and rapidly blend various metal powders. However, existing metal powder mixers still have certain shortcomings. While the rotating agitator stirs the powder, it cannot effectively mix the powder at the bottom of the machine, creating a dead zone where the powder cannot participate in the mixing process, resulting in uneven powder mixing. Furthermore, existing mixers cannot demagnetize the powder; if magnetic powder enters, it will agglomerate. To address these issues, we provide a high-entropy ceramic-bonded hard alloy and its preparation method to solve the problems mentioned above. Summary of the Invention

[0004] The purpose of this invention is to provide a high-entropy ceramic-bonded cemented carbide and its preparation method, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-entropy ceramic-bonded cemented carbide, comprising, by mass percentage, the following components: Ti powder, W powder, C powder, Ni powder, Cr powder, and Mo powder, wherein Ti accounts for 2% by mass, W accounts for 80% by mass, C accounts for 3.5% by mass, Ni accounts for 0.5% by mass, Cr accounts for 12% by mass, and Mo accounts for 2% by mass.

[0007] A method for preparing a high-entropy ceramic-bonded cemented carbide includes the following steps;

[0008] Step 1: Select the appropriate Ti powder, W powder, C powder, Ni powder, Cr powder and Mo powder, and then dry the powder using a drying equipment for 10-20 minutes;

[0009] Step 2: Take out the dried Ti powder, W powder, C powder, Ni powder, Cr powder and Mo powder, and put them into the mixer and mix for 30-50 minutes;

[0010] Step 3: Take out the mixed powder and pour it into the pressing mold. Use a press to press the powder into shape in the mold.

[0011] Step 3: Place the pressed blank into a sintering furnace and heat it to 500-800 degrees Celsius for 1-2 hours. Then heat it to 1300-1500 degrees Celsius for 1-1.5 hours. Then cool it down to 600-700 degrees Celsius for 3 hours. After the furnace is finished, cool it down with the furnace. After cooling, you will get the desired high-entropy ceramic-bonded cemented carbide.

[0012] A mixer in a method for preparing a high-entropy ceramic-bonded cemented carbide includes a base plate, a mounting plate fixedly connected to one side of the base plate, a support arm fixedly connected to the middle of the other side of the base plate, a tilting shaft rotatably connected between the support arm and the mounting plate, a neck cylinder fixedly connected to the middle of the tilting shaft, a mixing tank connected to both ends of the neck cylinder, a feeding port opened at the end of the mixing tank away from the neck cylinder, and a sealing component for closing the feeding port on the feeding port;

[0013] A heater is embedded in the inner wall of the neck cylinder. A stirring shaft is rotatably connected inside the stirring tank. Several stirring blades are fixedly connected to the stirring shaft. A transmission gear is fixedly connected to one end of the stirring shaft that protrudes from the stirring tank.

[0014] The end of the rotating shaft that passes through the mounting plate is fixedly connected to a rotating gear, and the mounting plate is provided with an intermittent rotation component for driving the rotating gear to rotate intermittently in both directions.

[0015] The lower end of the mounting plate is equipped with a drive component for driving the stirring component and the intermittent rotation component.

[0016] As a further aspect of the present invention: the sealing component includes a sealing cap, the sealing cap being threadedly connected to the feeding port, and a plurality of handles being fixedly connected to the surface of the sealing cap.

[0017] As a further embodiment of the present invention: the intermittent rotation component includes a limiting slide rail, the limiting slide rail is fixedly connected to the mounting plate at the position below the flip gear, a rack is slidably connected on the limiting slide rail, the rack meshes with the flip gear, a first magnet is provided at both ends of the lower end face of the rack, and a pusher component for pushing the rack to move is provided at the position below the rack on the mounting plate.

[0018] As a further embodiment of the present invention: the pushing assembly includes a sliding rod, which is fixedly connected to the mounting plate below the rack via a support. A reciprocating screw is rotatably connected above the sliding rod, and a reciprocating block is threaded onto the reciprocating screw. The reciprocating block is slidably connected to the sliding rod, and a second magnet is fixedly connected to the upper end of the support at both ends of the sliding rod.

[0019] As a further embodiment of the present invention: the driving assembly includes a sliding groove, which is located at the middle of the lower end of the mounting plate. A limiting slider is slidably connected within the sliding groove. A spring is installed between the lower end of the limiting slider and the lower end face of the sliding groove. An mounting shaft is rotatably connected to the upper end of the limiting slider. A driving gear that meshes with a transmission gear is fixedly connected to one end of the mounting shaft. A first bevel gear is fixedly connected to the other end of the mounting shaft. An internal hexagonal sleeve shaft is rotatably connected to the limiting slider below the first bevel gear. A second bevel gear that meshes with the first bevel gear is provided at the upper end of the internal hexagonal sleeve shaft. A hexagonal shaft is rotatably connected to the mounting plate below the second bevel gear. The hexagonal shaft is slidably connected to the internal hexagonal sleeve shaft. A power assembly for rotating the hexagonal shaft and the reciprocating lead screw is also provided at the lower end of the mounting plate.

[0020] As a further embodiment of the present invention: the power assembly includes a drive motor, which is installed on the lower end of one side of the mounting plate. The output shaft end of the drive motor and the position of the shaft head connected to one end of the reciprocating lead screw are both fixedly connected to pulleys. A belt is installed between the two pulleys. A third bevel gear is installed at the lower end of the hexagonal shaft and at the position of the output shaft of the drive motor near the lower end of the hexagonal shaft. The two third bevel gears mesh with each other.

[0021] As a further embodiment of the present invention, the upper end of the base plate is also provided with a gear ring for meshing with the transmission gear.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. The present invention can intermittently rotate the mixing tank during the mixing of powder by setting the intermittent rotation component, so that the mixing tank is continuously rotated intermittently, and the powder inside is continuously rotated during the rotation, thereby avoiding dead zones and uneven mixing.

[0024] 2. The present invention uses a heater embedded inside the neck cylinder to demagnetize the powder at high temperature during operation, thereby effectively preventing the agglomeration of magnetic powder and improving the uniformity of powder mixing. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is a schematic diagram of the structure on the other side of the present invention.

[0027] Figure 3 This is a partial structural diagram of the present invention.

[0028] Figure 4 This is a cross-sectional view of the mixing tank in this invention.

[0029] Figure 5 This is a schematic diagram of the structure of the mixing tank in this invention.

[0030] The components are as follows: 1. Base plate; 2. Neck cylinder; 3. Support arm; 4. Tilting shaft; 5. Mixing tank; 6. Sealing cap; 7. Gear ring; 8. Pulley; 9. Belt; 10. Drive gear; 11. Spring; 12. Limiting slider; 13. Mounting plate; 14. Limiting slide rail; 15. First magnet; 16. Mixing shaft; 17. Transmission gear; 18. Tilting gear; 19. Rack; 20. Second magnet; 21. Reciprocating screw; 22. Sliding rod; 23. Sliding groove; 24. First bevel gear; 25. Second bevel gear; 26. Drive motor; 27. Third bevel gear; 28. Hexagonal shaft; 29. ​​Internal hexagonal sleeve shaft; 30. Mounting shaft; 31. Feed port; 32. Mixing blade; 33. Heater; 34. Reciprocating block. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In this embodiment of the invention, a high-entropy ceramic-bonded cemented carbide is composed of the following components by mass percentage: Ti powder, W powder, C powder, Ni powder, Cr powder, and Mo powder. The Ti accounts for 2% of the total mass, the W accounts for 80% of the total mass, the C accounts for 3.5% of the total mass, the Ni accounts for 0.5% of the total mass, the Cr accounts for 12% of the total mass, and the Mo accounts for 2% of the total mass.

[0033] A method for preparing a high-entropy ceramic-bonded cemented carbide includes the following steps;

[0034] Step 1: Select the appropriate Ti powder, W powder, C powder, Ni powder, Cr powder and Mo powder, and then dry the powder using a drying equipment for 20 minutes;

[0035] Step 2: Take out the dried Ti powder, W powder, C powder, Ni powder, Cr powder and Mo powder, and put them into the mixer and mix for 40 minutes;

[0036] Step 3: Take out the mixed powder and pour it into the pressing mold. Use a press to press the powder into shape in the mold.

[0037] Step 3: Place the pressed blank into a sintering furnace and heat it to 700 degrees Celsius for 1 hour. Then heat it to 1400 degrees Celsius for 1 hour. Then cool it down to 600 degrees Celsius for 3 hours. After the furnace is finished, cool it down with the furnace. After cooling, you will get the desired high-entropy ceramic-bonded cemented carbide.

[0038] Please see Figures 1-5 A mixer in a method for preparing a high-entropy ceramic-bonded hard alloy includes a base plate 1. A mounting plate 13 is fixedly connected to one side of the base plate 1, and a support arm 3 is fixedly connected to the middle of the other side of the base plate 1. A tilting shaft 4 is rotatably connected between the support arm 3 and the mounting plate 13. A neck cylinder 2 is fixedly connected to the middle of the tilting shaft 4. Both ends of the neck cylinder 2 are connected to mixing tanks 5. Each mixing tank 5 has a feeding port 31 at the end away from the neck cylinder 2. Each feeding port 31 is equipped with a sealing component for sealing the feeding port 31. The sealing component can seal the feeding port 31 during use to prevent powder from scattering during the mixing process. At the same time, the two feeding ports 31 can discharge material regardless of which mixing tank 5 is at the bottom, making it convenient to use.

[0039] The sealing assembly includes a sealing cap 6, which is threadedly connected to the feeding port 31. Several handles are fixedly connected to the surface of the sealing cap 6. The sealing cap 6 can be rotated through the handles, which makes it easy to rotate the sealing cap 6 and remove it.

[0040] A heater 33 is embedded in the inner wall of the neck cylinder 2. A stirring shaft 16 is rotatably connected inside the mixing tank 5. Several stirring blades 32 are fixedly connected to the stirring shaft 16. A transmission gear 17 is fixedly connected to one end of the stirring shaft 16 that protrudes from the mixing tank 5. A gear ring 7 for meshing with the transmission gear 17 is also provided on the upper end of the bottom plate 1. By using the heater 33 embedded inside the neck cylinder 2, the powder can be demagnetized at high temperature during operation, which can effectively prevent the agglomeration of magnetic powder and improve the uniformity of powder mixing. At the same time, during the tumbling process of the mixing tank 5, the transmission gear 17 can mesh with the gear ring 7, which can drive the stirring blades 32 to rotate, thus facilitating the dispersal of powder during tumbling and improving mixing efficiency.

[0041] The rotating shaft 4 is fixedly connected to a rotating gear 18 at one end passing through the mounting plate 13. The mounting plate 13 is provided with an intermittent rotation assembly for driving the rotating gear 18 to rotate intermittently in both directions. The intermittent rotation assembly includes a limiting slide rail 14, which is fixedly connected to the mounting plate 13 at a position below the rotating gear 18. A rack 19 is slidably connected to the limiting slide rail 14, and the rack 19 meshes with the rotating gear 18. Both ends of the lower end face of the rack 19 are provided with first magnets 15. The mounting plate 13 at a position below the rack 19 is provided with a pushing assembly for pushing the rack 19 to move.

[0042] The intermittent rotation component can intermittently rotate the mixing tank 5 during powder mixing, causing the mixing tank 5 to continuously rotate intermittently. During rotation, the powder inside is continuously rotated, thereby avoiding dead zones and uneven mixing.

[0043] The pushing assembly includes a sliding rod 22, which is fixedly connected to the mounting plate 13 below the rack 19 via a support. A reciprocating screw 21 is rotatably connected above the sliding rod 22, and a reciprocating block 34 is threaded onto the reciprocating screw 21. The reciprocating block 34 is slidably connected to the sliding rod 22. A second magnet 20 is fixedly connected to the upper end of the support at both ends of the sliding rod 22.

[0044] During operation, the reciprocating screw 21 rotates, which drives the reciprocating block 34 to reciprocate. The reciprocating movement of the reciprocating block 34 drives the rack 19 to reciprocate intermittently. During the movement, the reciprocating block 34 pushes the first magnet 15 at one end to the end, so that the first magnet 15 is attracted to the corresponding second magnet 20, thus achieving a limit. Then, the reciprocating block 34 moves in the opposite direction under the action of the reciprocating screw 21. When the reciprocating block 34 moves to the first magnet 15 at the other end, it pushes the rack 19 to move in the opposite direction. Through the above movement, the reversing gear 18 and the neck cylinder 2 can be driven to revolve intermittently.

[0045] The lower end of the mounting plate 13 is provided with a drive assembly for driving the stirring assembly and the intermittent rotation assembly; the drive assembly includes a sliding groove 23, which is located in the middle of the lower end of the mounting plate 13. A limit slider 12 is slidably connected in the sliding groove 23. A spring 11 is installed between the lower end of the limit slider 12 and the lower end face of the sliding groove 23. An installation shaft 30 is rotatably connected to the upper end of the limit slider 12. One end of the installation shaft 30 is fixedly connected to a drive gear 10 that cooperates with the transmission gear 17. The other end of the mounting shaft 30 is fixedly connected to a first bevel gear 24. The limiting slider 12 is rotatably connected to an internal hexagonal sleeve shaft 29 located below the first bevel gear 24. The upper end of the internal hexagonal sleeve shaft 29 is provided with a second bevel gear 25 that meshes with the first bevel gear 24. The mounting plate 13 is rotatably connected to a hexagonal shaft 28 located below the second bevel gear 25. The hexagonal shaft 28 is slidably connected to the internal hexagonal sleeve shaft 29. The lower end of the mounting plate 13 is also provided with a power assembly for rotating the hexagonal shaft 28 and the reciprocating screw 21.

[0046] During operation, the rotation of the third bevel gear 27 drives the hexagonal shaft 28 to rotate, which in turn drives the second bevel gear 25 to rotate. The rotation of the second bevel gear 25 drives the first bevel gear 24 to rotate, which in turn drives the drive gear 10 to rotate. When the transmission gear 17 contacts the drive gear 10, the transmission drives the stirring plate 32 to rotate, thereby stirring the powder. At the same time, the spring 11 and the limiting slider 12 provide a certain amount of collapsing for the drive gear 10 to prevent tooth collision when the gears come into contact.

[0047] The power assembly includes a drive motor 26, which is mounted on the lower end of one side of the mounting plate 13. Pulleys 8 are fixedly connected to both the output shaft end of the drive motor 26 and the shaft head of the reciprocating lead screw 21. A belt 9 is installed between the two pulleys 8. Third bevel gears 27 are installed at the lower end of the hexagonal shaft 28 and near the lower end of the output shaft of the drive motor 26. The two third bevel gears 27 mesh with each other. During operation, the rotation of the output shaft of the drive motor 26 drives the third bevel gears 27 to rotate. Simultaneously, the output shaft of the drive motor 26 also drives the pulleys 8 to rotate, which in turn drives the belt 9 to rotate, thereby rotating the reciprocating lead screw 21.

[0048] The working principle of this invention is as follows: During use, the powder to be stirred is placed into the stirring tank 5. Then, the output shaft of the drive motor 26 rotates, driving the third bevel gear 27 to rotate. The rotation of the third bevel gear 27 drives the hexagonal shaft 28 to rotate, which in turn drives the second bevel gear 25 to rotate. The rotation of the second bevel gear 25 drives the first bevel gear 24 to rotate, which in turn drives the drive gear 10 to rotate. When the transmission gear 17 contacts the drive gear 10, the stirring blade 32 rotates, thus stirring the powder. The rotation of the reciprocating screw 21 drives the reciprocating block 34 to move reciprocally. The reciprocating movement of block 34 can drive rack 19 to perform reciprocating intermittent motion. During the movement, reciprocating block 34 will push the first magnet 15 at one end to move to the end, so that the first magnet 15 and the corresponding second magnet 20 are attracted to each other and the position is limited. Then, under the action of reciprocating screw 21, reciprocating block 34 moves in the opposite direction. When reciprocating block 34 moves to the first magnet 15 at the other end, it will push rack 19 to move in the opposite direction. Through the above movement, the flipping gear 18 and neck cylinder 2 can be driven to flip intermittently. Through the heater 33 embedded in the neck cylinder 2, the powder can be demagnetized at high temperature during operation, thereby effectively preventing the agglomeration of magnetic powder.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Although this specification describes embodiments, not every embodiment contains only one technical solution. This method of description is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mixer for preparing hard alloys for high-entropy ceramic bonding, characterized in that, Includes a base plate (1), on one side of the base plate (1) a mounting plate (13) is fixedly connected, and on the other side of the base plate (1) a support arm (3) is fixedly connected in the middle. A rotating shaft (4) is rotatably connected between the support arm (3) and the mounting plate (13). A neck cylinder (2) is fixedly connected in the middle of the rotating shaft (4). Both ends of the neck cylinder (2) are connected to a mixing tank (5). A feeding port (31) is opened on the end of the mixing tank (5) away from the neck cylinder (2). A sealing component for sealing the feeding port (31) is provided on the feeding port (31). A heater (33) is embedded in the inner wall of the neck cylinder (2). A stirring shaft (16) is rotatably connected inside the stirring tank (5). Several stirring blades (32) are fixedly connected on the stirring shaft (16). A transmission gear (17) is fixedly connected to one end of the stirring shaft (16) that passes through the stirring tank (5). The flipping shaft (4) is fixedly connected to a flipping gear (18) at one end through the mounting plate (13). The mounting plate (13) is provided with an intermittent rotation assembly for driving the flipping gear (18) to rotate intermittently in both directions. The lower end of the mounting plate (13) is provided with a drive component for driving the stirring component and the intermittent rotation component to operate; The upper end of the base plate (1) is also provided with a gear ring (7) for meshing with the transmission gear (17).

2. The mixer according to claim 1, characterized in that, The sealing assembly includes a sealing cap (6), which is threaded onto the feeding port (31), and a number of handles are fixedly connected to the surface of the sealing cap (6).

3. The mixer according to claim 2, characterized in that, The intermittent rotation assembly includes a limiting slide rail (14), which is fixedly connected to the mounting plate (13) below the flip gear (18). A rack (19) is slidably connected to the limiting slide rail (14), and the rack (19) meshes with the flip gear (18). A first magnet (15) is provided at both ends of the lower end face of the rack (19). A pusher assembly for pushing the rack (19) to move is provided at the position below the rack (19) on the mounting plate (13).

4. The mixer according to claim 3, characterized in that, The push assembly includes a sliding rod (22), which is fixedly connected to the mounting plate (13) below the rack (19) via a support. A reciprocating screw (21) is rotatably connected above the sliding rod (22), and a reciprocating block (34) is threaded onto the reciprocating screw (21). The reciprocating block (34) is slidably connected to the sliding rod (22), and a second magnet (20) is fixedly connected to the upper end of the support at both ends of the sliding rod (22).

5. The mixer according to claim 4, characterized in that, The drive assembly includes a sliding groove (23) located at the middle of the lower end of the mounting plate (13). A limiting slider (12) is slidably connected within the sliding groove (23). A spring (11) is installed between the lower end of the limiting slider (12) and the lower end face of the sliding groove (23). A mounting shaft (30) is rotatably connected to the upper end of the limiting slider (12). One end of the mounting shaft (30) is fixedly connected to a drive gear (10) that meshes with a transmission gear (17), and the other end of the mounting shaft (30) is fixedly connected to a first bevel gear (…). 24), the limiting slider (12) is rotatably connected to the internal hexagonal sleeve shaft (29) at the position below the first bevel gear (24). The upper end of the internal hexagonal sleeve shaft (29) is provided with a second bevel gear (25) that meshes with the first bevel gear (24). The mounting plate (13) is rotatably connected to the hexagonal shaft (28) at the position below the second bevel gear (25). The hexagonal shaft (28) is slidably connected to the internal hexagonal sleeve shaft (29). The lower end of the mounting plate (13) is also provided with a power assembly for rotating the hexagonal shaft (28) and the reciprocating screw (21).

6. The mixer according to claim 5, characterized in that, The power assembly includes a drive motor (26), which is installed on the lower end of one side of the mounting plate (13). The output shaft end of the drive motor (26) and the position of the shaft head connected to one end of the reciprocating screw (21) are both fixedly connected to pulleys (8). A belt (9) is installed between the two pulleys (8). The lower end of the hexagonal shaft (28) and the position of the output shaft of the drive motor (26) near the lower end of the hexagonal shaft (28) are both equipped with third bevel gears (27). The two third bevel gears (27) mesh with each other.

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