Crucible for improving stability of melt drawing pool

Abstract

The invention discloses a crucible for improving the stability of a melt drawing pool, and belongs to the technical field of melt drawing. The invention aims to solve the melting pool vibration phenomenon of the crucible of the existing melt drawing equipment. The invention discloses a crucible for improving the stability of a melt drawing pool. The crucible consists of a columnar crucible body and a conical crucible opening, a conical crucible opening is formed in the top of the columnar crucible body, and a cylindrical cavity and a conical cavity which are communicated with each other are sequentially formed in the conical crucible opening from top to bottom. The crucible is used for improving the stability of the melt drawing pool.

Description

Technical Field

[0001] The present invention belongs to the technical field of melt drawing technology. Background Art

[0002] The melt drawing forming technology uses a high-speed rotating roller to dip a liquid thin layer from the melt, and relies on the combined action of its own viscosity, surface tension and gravity to achieve precise control of the size and shape of low-dimensional materials. The melt drawing forming technology has strong adaptability and high cooling speed, and can realize non-equilibrium solidification or even amorphization of various metal and ceramic fiber materials and thin strips. At the same time, the high geometric symmetry of the prepared materials endows them with excellent magnetic, electrical and mechanical properties.

[0003] At present, the induction heating crucible used in the melt drawing technology is a tubular boron nitride crucible. Some alloy fibers with poor formability prepared have serious defects. This is because during the melt drawing process, the stability of the melt pool is crucial for preparing high-quality fibers. If a dynamic balance cannot be formed between the melt pool and the metal roller, it is difficult to ensure the fiber length and uniformity, and surface defects will occur. There are mainly two factors affecting the stability of the melt pool. One is the self-factor of the alloy liquid. The greater the surface tension of the alloy liquid, the more stable the melt pool. The other is the structural factor of the melt drawing equipment. The annular high-frequency induction coil around the crucible will cause the internal alloy liquid to flow. At the same time, the high-speed rotating copper wheel will also generate a wind field around the melt pool, resulting in the tremor of the alloy liquid melt pool, thus reducing the quality of the prepared fibers. Summary of the Invention

[0004] The present invention aims to solve the problem that the crucible of the existing melt drawing equipment has the phenomenon of melt pool tremor, which further reduces the fiber quality, and further provides a crucible for improving the stability of the melt drawing melt pool.

[0005] A crucible for improving the stability of the melt drawing melt pool, which consists of a columnar crucible body and a conical crucible mouth;

[0006] The top of the columnar crucible body is provided with a conical crucible mouth. Inside the conical crucible mouth, there is a cylindrical cavity and a conical cavity connected in sequence from top to bottom, and the lower part of the conical cavity is connected to the cavity of the columnar crucible body;

[0007] The inner diameter of the cylindrical cavity is 5.5 mm to 6.0 mm; the height of the cylindrical cavity is 1.0 mm to 1.5 mm; the height of the conical cavity is 2.0 mm to 2.5 mm.

[0008] The beneficial effects of the present invention are:

[0009] The present invention combines the traditional melt drawing crucible (such as Figure 1The straight cylinder shape at the top (as shown) is designed to be semi - enclosed. Firstly, it is to reduce the exposed area of the molten pool, thereby reducing the tremor of the molten pool caused by the high - speed rotation of the roller. Secondly, it is to reduce the induction heating volume of the molten pool, thereby reducing the electromagnetic force generated by eddy currents and making the liquid metal more stable (as Figure 3 shown).

[0010] Meanwhile, the improved crucible body maintains the traditional size because the crucible body is the induction heating area. During the feeding process, a relatively large induction heating volume is required to make the melting speed of the alloy adapt to the feeding speed to ensure that the alloy in contact with the copper wheel has been fully melted.

[0011] That is, on the basis of ensuring the same induction heating volume, the present invention reduces the size of the molten pool at the top of the crucible, avoids the instability of the molten pool, increases the stability of the molten pool during the process of drawing fibers from the melt, and improves the roundness and surface morphology of the alloy fibers well. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a side view of a traditional melt - drawing crucible;

[0013] Figure 2 is a side view of the crucible for improving the stability of the melt - drawing molten pool of the present invention;

[0014] Figure 3 is a schematic diagram of the process of drawing fibers from the melt of a traditional melt - drawing crucible and the crucible for improving the stability of the melt - drawing molten pool of the present invention, (a) traditional melt - drawing crucible, (b) crucible for improving the stability of the melt - drawing molten pool of the present invention;

[0015] Figure 4 is a side view of the crucible for improving the stability of the melt - drawing molten pool in Example 1;

[0016] Figure 5 is a top view of the crucible for improving the stability of the melt - drawing molten pool in Example 1;

[0017] Figure 6 is a side view of the traditional melt - drawing crucible in the comparative experiment;

[0018] Figure 7 is a top view of the traditional melt - drawing crucible in the comparative experiment;

[0019] Figure 8 is a scanning electron microscope image of the fiber made by using the traditional melt - drawing crucible in the comparative experiment;

[0020] Figure 9 is a scanning electron microscope image of the fiber made by using the crucible for improving the stability of the melt - drawing molten pool in Example 1. DETAILED DESCRIPTION OF THE INVENTION

[0021] Specific Embodiment 1, in combination with Figure 2 Specific description: A crucible for improving the stability of the melt drawing melt pool in this embodiment is composed of a columnar crucible body 1 and a conical crucible mouth 2;

[0022] The top of the columnar crucible body 1 is provided with a conical crucible mouth 2. Inside the conical crucible mouth 2, from top to bottom, there are a cylindrical cavity 2-1 and a conical cavity 2-2 that are connected in sequence and communicate with each other. Moreover, the lower part of the conical cavity 2-2 is connected to the cavity of the columnar crucible body 1;

[0023] The inner diameter of the cylindrical cavity 2-1 is 5.5 mm to 6.0 mm; the height of the cylindrical cavity 2-1 is 1.0 mm to 1.5 mm; the height of the conical cavity 2-2 is 2.0 mm to 2.5 mm.

[0024] The beneficial effects of this embodiment are:

[0025] In this embodiment, the straight cylinder shape at the top of the traditional melt drawing crucible (as Figure 1 shown) is designed to be semi-enclosed. One is to reduce the exposed area of the melt pool, thereby reducing the tremor of the melt pool caused by the high-speed rotation of the roller; the other is to reduce the induction heating volume of the melt pool, thereby reducing the electromagnetic force generated by the eddy current and making the liquid metal more stable (as Figure 3 shown).

[0026] At the same time, the position of the column body of the improved crucible maintains the traditional size because the column body position is the induction heating area. During the feeding process, the induction heating volume needs to be as large as possible to make the alloy melting speed adapt to the feeding speed to ensure that the alloy in contact with the copper wheel has been fully melted.

[0027] That is, on the basis of ensuring that the induction heating volume remains unchanged, this embodiment reduces the melt pool size at the top of the crucible, avoids the instability of the melt pool, increases the stability of the melt pool during the melt drawing fiber forming process, and improves the roundness and surface morphology of the alloy fiber well.

[0028] Specific Embodiment 2: The difference between this embodiment and Specific Embodiment 1 is that the outer diameter of the columnar crucible body 1 is 15.0 mm to 20.0 mm. Others are the same as Specific Embodiment 1.

[0029] Specific Embodiment 3: The difference between this embodiment and one of Specific Embodiments 1 or 2 is that the cavity shape of the columnar crucible body 1 is cylindrical. Others are the same as Specific Embodiment 1 or 2.

[0030] Specific Embodiment 4: The difference between this embodiment and one of Specific Embodiments 1 to 3 is that the inner diameter of the cavity of the columnar crucible body 1 is 10.0 mm to 11.0 mm. Others are the same as Specific Embodiment 3.

[0031] Embodiment 5: The difference between this embodiment and any one of Embodiments 1 to 4 is that: the height of the columnar crucible body 1 is 60.0 mm to 70.0 mm. Others are the same as those in Embodiments 1 to 4.

[0032] Embodiment 6: The difference between this embodiment and any one of Embodiments 1 to 5 is that: the outer diameter of the top of the conical crucible opening 2 is 8.0 mm to 9.0 mm. Others are the same as those in Embodiments 1 to 5.

[0033] Embodiment 7: The difference between this embodiment and any one of Embodiments 1 to 6 is that: a base 3 is provided at the bottom of the columnar crucible body 1. Others are the same as those in Embodiments 1 to 6.

[0034] Embodiment 8: The difference between this embodiment and any one of Embodiments 1 to 7 is that: the base 3 is in a cuboid structure or a cube structure. Others are the same as those in Embodiments 1 to 7.

[0035] Embodiment 9: The difference between this embodiment and any one of Embodiments 1 to 8 is that: the height of the base 3 is 15.0 mm to 25.0 mm, and the side length of the bottom surface is 15.0 mm to 25.0 mm. Others are the same as those in Embodiments 1 to 8.

[0036] Embodiment 10: The difference between this embodiment and any one of Embodiments 1 to 9 is that: the materials of the columnar crucible body 1 and the conical crucible opening 2 are boron nitride. Others are the same as those in Embodiments 1 to 9.

[0037] The following examples are used to verify the beneficial effects of the present invention:

[0038] Example 1, in combination with Figure 4 and 5 specifically illustrate:

[0039] A crucible for improving the stability of the melt drawing melt pool, which is composed of a columnar crucible body 1 and a conical crucible opening 2;

[0040] The conical crucible opening 2 is arranged at the top of the columnar crucible body 1. Inside the conical crucible opening 2, there are a cylindrical cavity 2-1 and a conical cavity 2-2 that are connected in sequence from top to bottom, and the lower part of the conical cavity 2-2 is connected to the cavity of the columnar crucible body 1;

[0041] The inner diameter of the cylindrical cavity 2-1 is 5.9 mm; the height of the cylindrical cavity 2-1 is 1.2 mm; the top diameter of the conical cavity 2-2 is 5.9 mm, and the bottom diameter is 10.5 mm; the height of the conical cavity 2-2 is 2.3 mm.

[0042] The outer diameter of the cylindrical crucible body 1 is 18 mm.

[0043] The cavity shape of the cylindrical crucible body 1 is cylindrical.

[0044] The inner diameter of the cavity of the cylindrical crucible body 1 is 10.5 mm.

[0045] The height of the cylindrical crucible body 1 is 61 mm.

[0046] The outer diameter of the top of the conical crucible mouth 2 is 8.3 mm.

[0047] A base 3 is provided at the bottom of the cylindrical crucible body 1.

[0048] The base 3 has a cuboid structure.

[0049] The height of the base 3 is 20 mm, the bottom surface is square, and the side length is 22 mm.

[0050] The materials of the cylindrical crucible body 1 and the conical crucible mouth 2 are boron nitride (BN).

[0051] Comparative experiment, combined with Figure 6 and 7 Specific description: The difference between this comparative experiment and Example 1 is that the conical crucible mouth 2 is cancelled. Others are the same as Example 1.

[0052] Using the comparative experiment of the traditional melt drawing crucible and the crucible in Example 1 to improve the stability of the melt pool in melt drawing to prepare fibers, the specific process is as follows: Put an alloy rod with a diameter of 8 cm and a length of 4 cm of Fe 64 Ce 15 Pr6B 15 into the crucible, then install it in the feeding device of the melt drawing equipment, evacuate to 6×10 -3 Pa, then introduce argon, start the copper metal roller, set the rotation speed of the copper metal roller to 1700 r / min, turn on the induction heating device, adjust the induction current to 24 A, after the alloy rod melts into an alloy melt, use the melt drawing method to make the metal roller dip into the alloy melt, with a feeding speed of 20 μm / s, control the melt pool in the crucible to move towards the copper metal roller direction, when the melt pool contacts the copper metal roller, the copper metal roller dips into the alloy melt in the melt pool and throws it out to obtain fibers;

[0053] Figure 8 Figure for the scanning electron microscope of the fibers prepared by using the comparative experiment of the traditional melt drawing crucible; Figure 9SEM image of the fibers made from the crucible that uses Example 1 to improve the stability of the melt drawing melt pool; as can be seen from the figure, the fibers made from the traditional melt drawing crucible cannot be smoothly rounded into filaments, and there are obvious surface defects, while the quality of the alloy fibers made from the improved crucible is improved, the fiber size is uniform, and there are no surface defects.

Claims

1. A crucible for improving the stability of the melt drawing molten pool, characterized in that It is composed of a columnar crucible body (1) and a conical crucible mouth (2); The top of the columnar crucible body (1) is provided with a conical crucible mouth (2). Inside the conical crucible mouth (2), from top to bottom, there are a connected cylindrical cavity (2-1) and a conical cavity (2-2) in sequence, and the lower part of the conical cavity (2-2) is connected to the cavity of the columnar crucible body (1); The internal diameter of the cylindrical cavity (2-1) is 5.5 mm to 6.0 mm; the height of the cylindrical cavity (2-1) is 1.0 mm to 1.5 mm; the height of the conical cavity (2-2) is 2.0 mm to 2.5 mm.

2. The crucible for improving the stability of the melt drawing melt pool according to claim 1, characterized in that The external diameter of the columnar crucible body (1) is 15.0 mm to 20.0 mm.

3. The crucible for improving the stability of the melt drawing melt pool according to claim 1, wherein The shape of the cavity of the columnar crucible body (1) is cylindrical.

4. A crucible for improving the stability of the melt drawing molten pool according to claim 3, characterized in that The internal diameter of the cavity of the columnar crucible body (1) is 10.0 mm to 11.0 mm.

5. A crucible for improving the stability of the melt drawing molten pool according to claim 1, characterized in that The height of the columnar crucible body (1) is 60.0 mm to 70.0 mm.

6. A crucible for improving the stability of the melt drawing melt pool according to claim 1, characterized in that The outer diameter of the top end of the conical crucible mouth (2) is 8.0 mm to 9.0 mm.

7. A crucible for improving the stability of the melt drawing molten pool according to claim 1, characterized in that A base (3) is provided at the bottom of the columnar crucible body (1).

8. A crucible for improving the stability of the melt drawing melt pool according to claim 7, characterized in that The base (3) is of a cuboid structure or a cube structure.

9. A crucible for improving the stability of the melt drawing melt pool according to claim 7, characterized in that The height of the base (3) is 15.0 mm to 25.0 mm, and the side length of the bottom surface is 15.0 mm to 25.0 mm.

10. A crucible for improving the stability of the melt drawing melt pool according to claim 1, characterized in that The materials of the columnar crucible body (1) and the conical crucible mouth (2) are boron nitride.

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