Sintering graphite die for tantalum-niobium insulator

Abstract

The utility model provides a graphite sintering die for a tantalum-niobium insulator. The graphite sintering die comprises a graphite bottom plate, a graphite sintering plate, a graphite positioning plate, a graphite pressing column and a graphite positioning column, the graphite bottom plate is arranged on the bottommost layer, the graphite sintering plate is arranged on the upper layer of the graphite bottom plate, and a plurality of grooves are formed in the graphite sintering plate and used for placing insulators; the graphite positioning plate is arranged on the upper layer of the graphite sintering plate, a plurality of pressing holes are formed in the graphite sintering plate, and the graphite pressing columns are arranged in the pressing holes and attached to a glass body of the insulator; corresponding mold positioning holes are formed in the graphite bottom plate, the graphite sintering plate and the graphite positioning plate, and the graphite positioning columns are inserted into the mold positioning holes for positioning. The tantalum (niobium) insulator is sintered in a pressing sintering mode, the problem that a tantalum wire climbs on glass is effectively solved, the tantalum (niobium) insulator has the advantages of being accurate in positioning, high in sintering efficiency and high in assembling speed, cost can be reduced, heat transfer can be effectively guaranteed, and therefore consistency of products is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of tantalum capacitor processing, in particular to a sintered graphite mold for tantalum-niobium insulators. Background Art

[0002] At present, tantalum (niobium) insulators are key components of tantalum capacitors and the last barrier to ensure the reliability of tantalum capacitors. The sealing performance determines the reliability of tantalum capacitors. Especially for liquid tantalum electrolytic capacitors, the sealing reliability is the main factor determining whether sulfuric acid liquid leaks out. Due to the use environment and special requirements of insulators, such insulators with high sealing requirements are all encapsulated with glass, while the current common glass and metal encapsulation uses graphite molds for positioning and high-temperature sintering.

[0003] In the prior art, the assembly and sintering method of glass-metal sealing adopts the bottom positioning, which is to insert the tantalum wire into the graphite mold, and the glass flows naturally after high-temperature sintering. However, after the packaging is completed, the glass will climb up the tantalum wire, resulting in the capacitor not being able to fit the circuit board completely after being assembled to the circuit board, so that force is applied to the glass, causing glass cracks and capacitor acid leakage. In this case, the acid leakage will cause devastating damage to the entire equipment, so further improvement is needed. Utility Model Content

[0004] The purpose of the utility model is to provide a sintered graphite mold which adopts a pressure sintering method to sinter tantalum (niobium) insulators, thereby effectively solving the problem of tantalum wire climbing on glass, in view of the shortcomings of the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a sintered graphite mold for tantalum-niobium insulators, comprising a graphite base plate, a graphite sintering plate, a graphite positioning plate, a graphite pressure column and a graphite positioning column;

[0006] The graphite bottom plate is arranged at the bottom layer, the graphite sintered plate is arranged at the upper layer of the graphite bottom plate, the lower surface of the graphite sintered plate is in contact with the upper surface of the graphite bottom plate, and a plurality of grooves are provided on the graphite sintered plate, and the grooves are used to place insulators;

[0007] The graphite positioning plate is arranged on the upper layer of the graphite sintered plate, the lower surface of the graphite positioning plate is in contact with the upper surface of the graphite sintered plate, the graphite sintered plate is provided with a plurality of pressing holes, the graphite pressure column is arranged in the pressing holes, and the lower surface of the graphite pressure column is in contact with the upper surface of the glass body of the insulator;

[0008] The graphite bottom plate, the graphite sintered plate, and the graphite positioning plate are all provided with corresponding mold positioning holes, and the graphite positioning column is inserted into the mold positioning hole and passes through the graphite positioning plate, the graphite sintered plate, and the graphite bottom plate in sequence.

[0009] Furthermore, the shape and size of the groove match the shape and size of the niobium cover or tantalum cover of the insulator.

[0010] Furthermore, the graphite sintered plate is provided with a plurality of tantalum wire positioning holes, and the graphite pressure column is also provided with a tantalum wire positioning hole. The bottom of the tantalum wire of the insulator is inserted into the tantalum wire positioning hole of the graphite sintered plate, and the top of the tantalum wire of the insulator is inserted into the tantalum wire positioning hole of the graphite pressure column. After the graphite pressure column is installed in the pressure hole, the tantalum wire positioning hole of the graphite pressure column is aligned with the tantalum wire positioning hole of the graphite positioning plate.

[0011] Furthermore, the graphite pressure column and the pressure hole are clearance-fitted.

[0012] Furthermore, the graphite positioning column and the mold positioning hole are interference fit.

[0013] Furthermore, the grooves of the graphite sintering plate, the tantalum wire positioning holes, and the pressing holes of the graphite positioning plate are all provided with multiple groups, so that the sintered graphite mold can sinter multiple insulators at the same time.

[0014] Furthermore, the mold positioning holes are located at four diagonal positions of the graphite bottom plate, the graphite sintering plate, and the graphite positioning plate.

[0015] Furthermore, the shape of the graphite positioning column is set to be T-shaped, the lower end of the graphite positioning column is inserted into the mold positioning hole, and the upper end of the graphite positioning column is located above the graphite positioning plate.

[0016] Furthermore, the length of the lower end of the graphite positioning column is greater than the total thickness of the graphite base plate, the graphite sintered plate, and the graphite positioning plate, and the graphite positioning column of the upper layer of the sintered graphite mold protruding downward from the graphite base plate is inserted into the empty mold positioning hole of the lower layer of the sintered graphite mold, so that the positions of the multi-layer stacked sintered graphite molds are aligned with each other.

[0017] Furthermore, the graphite used in the graphite bottom plate, the graphite sintered plate, the graphite positioning plate, the graphite pressure column and the graphite positioning column has a flexural strength of ≥42MPa, a tensile strength of ≥28MPa, and a thermal expansion coefficient of ≤1×10 -6 / ℃.

[0018] The above solution of the utility model has the following beneficial effects:

[0019] The sintered graphite mold for tantalum-niobium insulators provided by the utility model adopts a pressure-sintering sintering method to sinter tantalum (niobium) insulators through the arrangement of a graphite bottom plate, a graphite sintering plate, a graphite positioning plate, a graphite pressure column and a graphite positioning column, effectively solves the problem of tantalum wire climbing on glass, has the characteristics of accurate positioning, high sintering efficiency and fast assembly speed, can be used for semi-automatic or fully automatic sintering, and can realize the sintering of multi-layer sintered graphite molds combined together, which can not only reduce costs, but also effectively ensure heat transfer, thereby ensuring product consistency;

[0020] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0022] Figure 2 It is an exploded view of the overall structure of the utility model;

[0023] Figure 3 for Figure 1 Cross-sectional view of .

[0024] [Description of Reference Numerals]

[0025] 1-graphite base plate; 2-graphite sintering plate; 3-graphite positioning plate; 4-graphite pressure column; 5-graphite positioning column; 6-groove; 7-niobium cover; 8-pressing hole; 9-glass body; 10-tantalum wire; 11-tantalum wire positioning hole; 12-mold positioning hole. DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a locking connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1-Figure 3 As shown, an embodiment of the utility model provides a sintered graphite mold for tantalum-niobium insulators, comprising a graphite base plate 1, a graphite sintered plate 2, a graphite positioning plate 3, a graphite pressure column 4 and a graphite positioning column 5. Among them, the graphite base plate 1 is arranged at the bottom layer, and is used to support the entire sintered graphite mold. The graphite sintered plate 2 is arranged on the upper layer of the graphite base plate 1, and the lower surface of the graphite sintered plate 2 is in contact with the upper surface of the graphite base plate 1. At the same time, a plurality of grooves 6 are provided on the graphite sintered plate 2, and the shape and size of the grooves 6 match the shape and size of the niobium cover 7 (or tantalum cover) of the tantalum (niobium) insulator. During sintering, the tantalum (niobium) insulator is placed in the groove 6, which can just accommodate the niobium cover 7 and position it.

[0030] The graphite positioning plate 3 is arranged on the upper layer of the graphite sintering plate 2, and the lower surface of the graphite positioning plate 3 is in contact with the upper surface of the graphite sintering plate 2. The graphite sintering plate 2 is provided with a plurality of pressing holes 8, and the graphite pressing column 4 is arranged in the pressing hole 8, and the lower surface of the graphite pressing column 4 is in contact with the upper surface of the glass body 9 of the tantalum (niobium) insulator, thereby limiting the glass body 9 to prevent the glass from climbing the tantalum wire 10 during the sintering process.

[0031] Among them, the graphite positioning plate 3 is provided with a plurality of tantalum wire positioning holes 11. During the sintering process, the bottom of the tantalum wire 10 of the tantalum (niobium) insulator is inserted into the tantalum wire positioning hole 11 to position the tantalum wire 10, and its length is consistent with the length of the lower end of the tantalum wire 10 required by the tantalum (niobium) insulator. Correspondingly, the graphite pressure column 4 is also provided with a tantalum wire positioning hole 11. When the graphite pressure column 4 is installed in the pressure hole 8, the tantalum wire positioning hole 11 of the graphite pressure column 4 is aligned with the tantalum wire positioning hole 11 of the graphite positioning plate 3, and is located at the center of the groove 6, so as to be consistent with the tantalum wire 10 located at the center of the tantalum (niobium) insulator, and both ends of the tantalum wire 10 are accurately positioned, and the position of the tantalum (niobium) insulator in the groove 6 can also be ensured to be accurate, so that the problem of eccentricity of the tantalum wire 10 after sintering can be effectively solved.

[0032] It should be noted that during the sintering process, the graphite pressure column 4 is directly placed in the pressure hole 8 of the graphite sintering plate 2, and relies on gravity to press the glass body 9 to prevent the tantalum wire 10 from climbing up the glass during the sintering process. At the same time, the graphite pressure column 4 and the pressure hole 8 are matched with a small gap, which facilitates the placement and removal of the graphite pressure column 4.

[0033] At the same time, corresponding mold positioning holes 12 are provided on the graphite base plate 1, the graphite sintering plate 2, and the graphite positioning plate 3. The graphite positioning column 5 is inserted into the mold positioning hole 12 from top to bottom and passes through the graphite positioning plate 3, the graphite sintering plate 2, and the graphite base plate 1 in sequence, so that the graphite positioning plate 3, the graphite sintering plate 2 and the graphite base plate 1 are aligned as a whole, and the tantalum wire positioning hole 11 of the graphite pressure column 4 is aligned with the tantalum wire positioning hole 11 of the graphite sintering plate 2. It should be noted that the graphite positioning column 5 and the mold positioning hole 12 are in an interference fit manner to ensure the stability of the graphite base plate 1, the graphite sintering plate 2, and the graphite positioning plate 3 as a whole during the sintering process.

[0034] As a preferred embodiment, in this embodiment, the grooves 6 and tantalum wire positioning holes 11 on the graphite sintering plate 2 and the pressing holes 8 on the graphite positioning plate 3 are arranged in multiple groups, so that the sintered graphite mold can sinter multiple tantalum (niobium) insulators at the same time, thereby improving the processing efficiency. The mold positioning holes 12 are preferably located at four diagonal positions (or corner positions of other shapes) of the graphite base plate 1, the graphite sintering plate 2, and the graphite positioning plate 3, so as not to occupy the sintering space of the tantalum (niobium) insulator as much as possible.

[0035] It should be noted that the graphite used in the graphite bottom plate 1, the graphite sintering plate 2, the graphite positioning plate 3, the graphite pressure column 4 and the graphite positioning column 5 in this embodiment has a flexural strength of ≥42MPa, a tensile strength of ≥28MPa, and a thermal expansion coefficient of ≤1×10 -6 / °C to adapt to the sintering strength of the tantalum (niobium) insulator and the ambient temperature, and to avoid the problem of the glass body 9 adhering to graphite after pressure sintering.

[0036] As a preferred embodiment, the diameter of the tantalum wire positioning hole 11 in this embodiment is set to 1.05±0.05mm. The thickness of the graphite bottom plate 1 is set to 3-4mm, and its lower surface needs to be kept flat with a flatness of ≤0.1mm. The thickness of the groove 6 of the graphite sintered plate 2 is as consistent as possible with the thickness of the niobium cover 7. The thickness of the graphite positioning plate 3 is set to 6-8mm, and the diameter of the pressing hole 8 is set to Correspondingly, the diameter of the graphite pressure column 4 is The thickness is 5-8mm.

[0037] As a preferred embodiment, the graphite positioning column 5 in this embodiment adopts a T-shape similar to a bolt, with its thinner lower end inserted into the mold positioning hole 12, and its thicker upper end located above the graphite positioning plate 3, and the length of its lower end is 4-6mm greater than the total thickness of the graphite bottom plate 1, the graphite sintered plate 2, and the graphite positioning plate 3. The graphite positioning column 5 and the mold positioning hole 12 adopt an interference fit, and the diameter of the mold positioning hole 12 is 0.05mm-0.15mm smaller than the diameter of the lower end of the graphite positioning column 5. This structural form is convenient for installing and disassembling the graphite positioning column 5.

[0038] In addition, multiple sintered graphite molds can be stacked and sintered simultaneously to save sintering space, improve sintering efficiency, and reduce sintering costs. Since the length of the thin end of the aforementioned graphite positioning column 3 is greater than the total thickness of the graphite base plate 1, the graphite sintering plate 2, and the graphite positioning plate 3, the graphite positioning column 5 can be inserted into some of the mold positioning holes 12 of the next layer of sintered graphite mold, and the graphite positioning column 5 of the previous layer of sintered graphite mold that protrudes downward from the graphite base plate 1 is inserted into the above-mentioned mold positioning hole 12 of the next layer of sintered graphite mold, so that the positions of the multi-layer stacked sintered graphite molds are also accurately aligned with each other, thereby improving the overall stability and reliability.

[0039] In summary, the sintered graphite mold for tantalum-niobium insulators provided in this embodiment uses a pressure-sintering method to sinter tantalum (niobium) insulators through a graphite pressure column 4, which effectively solves the problem of tantalum wire climbing on glass. It has the characteristics of accurate positioning, high sintering efficiency, and fast assembly speed. It can be used for semi-automatic or fully automatic sintering, and can realize the sintering of multiple layers of sintered graphite molds combined together, which can not only reduce costs, but also effectively ensure heat transfer, thereby ensuring product consistency.

[0040] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A sintered graphite mold for tantalum-niobium insulators, characterized in that: It includes a graphite base plate, a graphite sintering plate, a graphite positioning plate, a graphite pressure column and a graphite positioning column; The graphite bottom plate is arranged at the bottom layer, the graphite sintered plate is arranged at the upper layer of the graphite bottom plate, the lower surface of the graphite sintered plate is in contact with the upper surface of the graphite bottom plate, and a plurality of grooves are provided on the graphite sintered plate, and the grooves are used to place insulators; The graphite positioning plate is arranged on the upper layer of the graphite sintered plate, the lower surface of the graphite positioning plate is in contact with the upper surface of the graphite sintered plate, the graphite sintered plate is provided with a plurality of pressing holes, the graphite pressure column is arranged in the pressing holes, and the lower surface of the graphite pressure column is in contact with the upper surface of the glass body of the insulator; The graphite bottom plate, the graphite sintered plate, and the graphite positioning plate are all provided with corresponding mold positioning holes, and the graphite positioning column is inserted into the mold positioning hole and passes through the graphite positioning plate, the graphite sintered plate, and the graphite bottom plate in sequence.

2. The sintered graphite mold for tantalum-niobium insulator according to claim 1, characterized in that: The shape and size of the groove match the shape and size of the niobium cover or tantalum cover of the insulator.

3. The sintered graphite mold for tantalum-niobium insulator according to claim 1, characterized in that: The graphite sintered plate is provided with a plurality of tantalum wire positioning holes, and the graphite pressure column is also provided with a tantalum wire positioning hole. The bottom of the tantalum wire of the insulator is inserted into the tantalum wire positioning hole of the graphite sintered plate, and the top of the tantalum wire of the insulator is inserted into the tantalum wire positioning hole of the graphite pressure column. After the graphite pressure column is installed in the pressure hole, the tantalum wire positioning hole of the graphite pressure column is aligned with the tantalum wire positioning hole of the graphite positioning plate.

4. The sintered graphite mold for tantalum-niobium insulator according to claim 1, characterized in that: The graphite pressure column and the pressure hole are clearance-fitted.

5. The sintered graphite mold for tantalum-niobium insulator according to claim 1, characterized in that: The graphite positioning column and the mold positioning hole are interference fit.

6. The sintered graphite mold for tantalum-niobium insulator according to claim 1, characterized in that: The grooves of the graphite sintering plate, the tantalum wire positioning holes, and the pressing holes of the graphite positioning plate are all provided with multiple groups, so that the sintered graphite mold can sinter multiple insulators at the same time.

7. The sintered graphite mold for tantalum-niobium insulator according to claim 6, characterized in that: The mold positioning holes are located at four diagonal positions of the graphite bottom plate, the graphite sintering plate, and the graphite positioning plate.

8. The sintered graphite mold for tantalum-niobium insulator according to claim 1, characterized in that: The shape of the graphite positioning column is set to be T-shaped, the lower end of the graphite positioning column is inserted into the mold positioning hole, and the upper end of the graphite positioning column is located above the graphite positioning plate.

9. The sintered graphite mold for tantalum-niobium insulator according to claim 8, characterized in that: The length of the lower end of the graphite positioning column is greater than the total thickness of the graphite base plate, the graphite sintered plate, and the graphite positioning plate. The graphite positioning column of the upper layer of the sintered graphite mold protruding downward from the graphite base plate is inserted into the empty mold positioning hole of the lower layer of the sintered graphite mold, so that the positions of the multi-layer stacked sintered graphite molds are aligned with each other.

10. A sintered graphite mold for tantalum-niobium insulator according to any one of claims 1 to 9, characterized in that: The graphite used in the graphite bottom plate, the graphite sintered plate, the graphite positioning plate, the graphite pressure column and the graphite positioning column has a flexural strength of ≥42MPa, a tensile strength of ≥28MPa, and a thermal expansion coefficient of ≤1×10 -6 / ℃.

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