Capacitor sintering crucible

Abstract

The utility model discloses a capacitor sintering crucible, which comprises a crucible main body, a support column A and a support column B. The side wall of the crucible main body is provided with a plurality of through holes A, the bottom surface of the crucible main body is provided with a plurality of through holes B, the support column A is connected with the side wall of the crucible main body, and the support column B is connected with the bottom surface of the crucible main body. Through the arrangement of the through hole A and the through hole B, the thermal radiation heat transfer effect is improved, and the impurity discharging capacity of the tantalum core in the sintering process is improved. The tantalum crucible prepared by adopting the method has the advantage of high sintering efficiency, the temperature difference between the upper layer and the lower layer is small, the tantalum core shrinkage rate range is small, and the capacitance and the leakage current are kept consistent after the tantalum core is energized.

Description

Technical Field

[0001] The utility model belongs to the technical field of crucibles for capacitor sintering, in particular to a capacitor sintering crucible. Background Art

[0002] Since high-energy hybrid tantalum capacitors use large-capacity electrochemical capacitor cathodes instead of electrolytic capacitor cathodes, the volume of the electrochemical capacitor cathode is very small, and the saved space can be used to increase the size of the anode. Therefore, the energy density of the capacitor can be increased exponentially. High-energy hybrid tantalum capacitors have the advantages of high operating voltage, good AC characteristics, high energy density, and high power, and can be used in pulse power supplies, filters, and communication equipment. With the widespread application of high-energy hybrid tantalum capacitors in energy storage, power-off delay protection and other functions, the task of producing high-energy hybrid tantalum capacitors in workshops has become increasingly arduous. In addition, due to increasingly fierce market competition, shorter delivery cycles can create greater benefits. Therefore, improving the sintering efficiency of high-energy hybrid tantalum capacitors is crucial to improving market competitiveness and contract delivery rates.

[0003] The existing tantalum crucibles used for sintering high-energy hybrid tantalum capacitors are relatively small, and the sintering furnace load of a single crucible of this specification is low, resulting in low sintering efficiency and large differences in tantalum core shrinkage within a batch. Therefore, a sintering crucible that can improve efficiency is needed.

[0004] Patent document with announcement number CN207468678U discloses a stacked crucible assembly for a vacuum furnace. Although the patent discloses a lifting rod and a reserved heat dissipation gap, it is not suitable for sintering tantalum capacitors and cannot be used for stacking the furnace. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a capacitor sintering crucible.

[0006] The utility model is achieved through the following technical solutions.

[0007] The utility model provides a capacitor sintering crucible, which includes a crucible body, a support A and a support B. The side wall of the crucible body is provided with a plurality of through holes A, the bottom surface of the crucible body is provided with a plurality of through holes B, the support A is connected to the side wall of the crucible body, and the support B is connected to the bottom surface of the crucible body.

[0008] Preferably, the cross-section of the crucible body is circular, the crucible body is connected to the pillar B via a connecting ring, and the connecting ring is connected to the pillar B by welding.

[0009] Preferably, the connecting ring is bent in a J-shape, and includes a contact portion and a bending portion. One end of the contact portion is connected to one end of the bending portion, the other end of the bending portion is connected to the bottom surface of the crucible body, the side wall of the contact portion is in contact with the pillar B, and the bottom surface of the contact portion is welded to the bottom surface of the pillar B.

[0010] Preferably, a plurality of pillars A are evenly distributed circumferentially on the inner wall of the side wall of the crucible body, and the pillars A are welded to the crucible body.

[0011] Preferably, the top height of the support A is greater than the top height of the crucible body.

[0012] Preferably, the pillar B is provided through the crucible body, the bottom surface of the pillar B is flush with the bottom surface of the crucible body, and the pillar B is in a hollow cylindrical shape.

[0013] Preferably, the top height of the pillar B is greater than or equal to the top height of the pillar A.

[0014] Preferably, the diameter of the pillar A is smaller than the diameter of the pillar B.

[0015] The beneficial effects of the present invention are:

[0016] The utility model enhances the heat transfer effect of thermal radiation and the ability of the tantalum core to expel impurities during the sintering process by providing through-holes A and B. The tantalum crucible prepared using this application not only has the advantages of high sintering efficiency, but also has a small temperature difference between the upper and lower layers, a small difference in the shrinkage rate of the tantalum core, and consistent capacitance and leakage current after the tantalum core is energized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 This is a schematic structural diagram of the AA section of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of area A of the utility model;

[0020] Figure 4 It is a top view of the utility model;

[0021] Figure 5 It is a structural diagram of the utility model;

[0022] In the figure: 1-crucible body, 11-through hole A, 12-through hole B, 2-pillar A, 3-pillar B, 4-connecting ring, 41-contact part, 42-bend part. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the described solution.

[0024] Example 1:

[0025] like Figures 1 to 5As shown, a capacitor sintering crucible includes a crucible body 1, pillars A2, and pillars B3. The crucible body 1 has several through-holes A11 on its sidewalls and several through-holes B12 on its bottom. The pillars A2 are connected to the sidewalls of the crucible body 1, and the pillars B3 are connected to the bottom of the crucible body 1. The crucible body 1, pillars A2, and pillars B3 are all made of tantalum. Pillar A2 is attached to a hanger to facilitate the movement of the crucible, and pillar B3 is provided to provide spacing when stacking crucibles. The provision of through-holes A11 and B12 enhances heat transfer through radiation and improves the ability of the tantalum core to expel impurities during the sintering process.

[0026] The crucible body 1 has a circular cross section. The crucible body 1 is connected to the support B3 via a connecting ring 4 . The connecting ring 4 is welded to the support B3 .

[0027] The connecting ring 4 is bent in a J-shape and includes a contact portion 41 and a bent portion 42. One end of the contact portion 41 is connected to one end of the bent portion 42, and the other end of the bent portion 42 is connected to the bottom surface of the crucible body 1. The side wall of the contact portion 41 is in contact with and connected to the support B3, and the bottom surface of the contact portion 41 is welded to the bottom surface of the support B3.

[0028] A plurality of pillars A2 are evenly distributed circumferentially on the inner wall of the side wall of the crucible body 1 , and the pillars A2 are connected to the crucible body 1 by welding.

[0029] The top height of the support A2 is greater than the top height of the crucible body 1 .

[0030] The support B3 is provided through the crucible body 1 , and the bottom surface of the support B3 is flush with the bottom surface of the crucible body 1 . The support B3 is in a hollow cylindrical shape.

[0031] The top height of the pillar B3 is greater than or equal to the top height of the pillar A2.

[0032] The diameter of the pillar A2 is smaller than the diameter of the pillar B3.

[0033] Comparative Example 1:

[0034] The structure of the crucible is substantially the same as that of Example 1, except that the through hole A and the through hole B are not provided on the crucible body, and the height of the crucible body is half that of Example 1.

[0035] The comparison of the structure and loading rate of the crucible of Example 1 and Comparative Example 1 is shown in Table 1.

[0036] Table 1 Tantalum crucible structure comparison table

[0037] Comparative Example 1 Example 1 Crucible height / mm 30 60 Number of through holes A 0 216 Number of through holes B 0 32 Single crucible loading capacity / piece 40 144

[0038] The crucibles of Example 1 and Comparative Example 1 were used to perform the following preparation process:

[0039] 1) Use 23000μF·V / g tantalum powder with a specific volume to form CASD5 type 63V4000μF (φ33.5×3) tantalum anode cores. The formed tantalum anode cores are laid flat in a single layer of 8 pieces into the crucible to cover the entire crucible.

[0040] 2) Sintering: Use a high temperature of (1435±10)°C, maintain it for (20±5) minutes after reaching the temperature, and remove it from the furnace after cooling to 30°C, ensuring that the specific capacitance of the tantalum core and tantalum powder after sintering is about 23000μF·V / g.

[0041] 3) Conventional phosphoric acid-ethylene glycol solution was used for step-by-step voltage boosting, with a boost current density of 0.008 mA / g at (0-30) V, 0.006 mA / g at (30-60) V, and 0.005 mA / g at (60-90) V. When the voltage reached 90 V, the voltage was maintained constant for 4.5 h ± 5 min to prepare a tantalum core with a good Ta2O5 dielectric oxide film.

[0042] The crucible of Comparative Example 1 is a two-layer stacked sintered crucible. Compared with the crucible of Example 1, in terms of structure, under the same diameter size, the crucible of Comparative Example 1 has a height of 30mm, and the crucible is surrounded by a solid tantalum sheet structure. The single crucible tantalum core loading capacity is stacked by 5 layers, totaling 40 pieces. The crucible of Example 1 has a height of 60mm, and the crucible is surrounded by evenly arranged through holes A11 and through holes B12. The single crucible tantalum core loading capacity is stacked by 18 layers, totaling 144 pieces. In terms of electrical performance parameter comparison, as shown in Table 2, using the crucible of Example 1, the sintering efficiency is increased by 80%, the temperature difference between the two stacked and sintered tantalum crucibles is reduced (20°C), the extreme difference in shrinkage rate of the tantalum core sintered in the same furnace is reduced by 1.5%, and the capacitance and leakage current of the tantalum core remain consistent after energization.

[0043] Table 2 Comparison of crucible and tantalum core parameters

[0044]

[0045] As can be seen from Table 2, Example 1 is a tantalum crucible for sintering high-energy hybrid tantalum capacitors with high sintering efficiency, and the tantalum cores manufactured in this application have high dimensional consistency, and the capacitance and leakage current parameters of the tantalum cores remain unchanged after energization.

Claims

1. A capacitor sintered crucible, characterized in that: The crucible comprises a crucible body (1), a support A (2) and a support B (3); a plurality of through holes A (11) are provided on the side wall of the crucible body (1); a plurality of through holes B (12) are provided on the bottom surface of the crucible body (1); the support A (2) is connected to the side wall of the crucible body (1); and the support B (3) is connected to the bottom surface of the crucible body (1).

2. A capacitor sintered crucible according to claim 1, characterized in that: The crucible body (1) has a circular cross section, and the crucible body (1) is connected to the pillar B (3) via a connecting ring (4), and the connecting ring (4) is connected to the pillar B (3) by welding.

3. A capacitor sintered crucible according to claim 2, characterized in that: The connecting ring (4) is bent in a J-shape and comprises a contact portion (41) and a bent portion (42). One end of the contact portion (41) is connected to one end of the bent portion (42), and the other end of the bent portion (42) is connected to the bottom surface of the crucible body (1). The side wall of the contact portion (41) is in contact with and connected to the support B (3), and the bottom surface of the contact portion (41) is welded to the bottom surface of the support B (3).

4. The capacitor sintered crucible according to claim 1, wherein: A plurality of pillars A (2) are evenly distributed circumferentially on the inner wall of the side wall of the crucible body (1), and the pillars A (2) are connected to the crucible body (1) by welding.

5. The capacitor sintered crucible according to claim 1, wherein: The top height of the support A (2) is greater than the top height of the crucible body (1).

6. The capacitor sintered crucible according to claim 1, wherein: The support B (3) is arranged to pass through the crucible body (1), the bottom surface of the support B (3) is flush with the bottom surface of the crucible body (1), and the support B (3) is in a hollow cylindrical shape.

7. The capacitor sintered crucible according to claim 1, wherein: The top height of the support B (3) is greater than or equal to the top height of the support A (2).

8. The capacitor sintered crucible according to claim 1, wherein: The diameter of the pillar A (2) is smaller than the diameter of the pillar B (3).

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