Zinc oxide piezoresistor high-temperature sintering sagger

Abstract

The utility model relates to the technical field of high-temperature sintering, in particular to a high-temperature sintering sagger for a zinc oxide piezoresistor. Comprising a sintering sagger body with an open end rectangular structure and a cover plate arranged at the top of the sintering sagger body, limiting plates are arranged on the left side, the right side and the rear side of the top of the open end of the sintering sagger body, first clamping grooves are formed in the inner walls of the lower portions of the limiting plates, and the first clamping grooves in the limiting plates communicate in sequence; the sides, away from the rear limiting plate, of the first clamping grooves in the left limiting plate and the right limiting plate are provided with inlets of the cover plate. According to the sintering sagger, the first clamping groove, the upper cover plate, the second clamping groove and other structures are used in a matched mode, the cover plate and the sintering sagger body can be completely embedded, meanwhile, a labyrinth path is formed, the problem that sealing is not tight due to long-term use of the sagger is solved, the service life of the sintering sagger body is prolonged, and the service life of the sintering sagger is prolonged. And the risk of performance degradation of the zinc oxide varistor caused by untight sealing of the sintering sagger body is greatly avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature sintering, in particular to a high-temperature sintering sagger for zinc oxide varistor. Background Art

[0002] Zinc oxide varistors are polycrystalline ceramic materials made by sintering a ceramic process using ZnO as the main component and various metal oxides (Bi2O3, MnO2, Co3O4, Cr2O3, Sb2O3, etc.). Their current-voltage (IV) characteristics are similar to those of a bidirectional Zener diode, exhibiting excellent nonlinearity. Bi2O3 is a key dopant in zinc oxide varistors and significantly influences their electrical performance. Bi2O3 has a low melting point, melting to a liquid phase at 825°C. This promotes ZnO sintering, grain growth, solid solution of additives with ZnO, and segregation of some additives at grain boundaries during cooling, playing a crucial role in enhancing the grain boundary barrier. However, this also causes Bi2O3 to volatilize during high-temperature sintering. Therefore, a good sintering atmosphere must be maintained during high-temperature sintering, placing high demands on the sealing properties of the sintering crucible.

[0003] The sagger is the carrier for the varistor during high-temperature sintering. The pressed varistor blank needs to be placed inside the sagger before entering the kiln for high-temperature sintering. Therefore, the sagger should have properties such as high-temperature resistance, good thermal conductivity, and good sealing. Currently, the existing technology seals the sagger using a rectangular cover directly covering the top of the sagger opening. The sealing performance of a new sagger is good during initial use, but after a period of use, varying degrees of wear will occur, resulting in a gap between the sagger and the cover, causing the sealing performance to deteriorate and the performance of the varistor to deteriorate. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a high-temperature sintering sagger for zinc oxide varistor, which adopts a nested sealing method to improve the sealing performance.

[0005] In order to achieve the above technical objectives, the utility model proposes the following technical solutions: a high-temperature sintering sagger for zinc oxide varistor, comprising a sintering sagger body with an open-end rectangular structure and a cover plate arranged on the top of the sintering sagger body, and limit plates are provided on the left, right and rear sides of the top of the open end of the sintering sagger body, and a first card slot is provided on the inner wall of the lower part of the limit plate. The first card slots on the limit plate are connected in sequence, and the first card slots on the left and right limit plates are provided with an entrance of the cover plate on the side away from the rear limit plate.

[0006] Furthermore, the cover plate includes an upper cover plate and a lower cover plate, the upper cover plate is arranged on the top of the lower cover plate, the left side, right side and rear side of the lower cover plate are respectively arranged in the first card slot, and the left outer side, right outer side and upper part of the rear outer side of the lower cover plate are opened with second card slots that are connected in sequence, and the part of the limit plate that protrudes from the first card slot is arranged in the second card slot.

[0007] Furthermore, the size of the lower cover plate is adapted to the size of the space enclosed by the first slot on the limiting plate, and the size of the space enclosed by the inner wall of the limiting plate protruding from the first slot is adapted to the size of the space enclosed by the second slot.

[0008] Furthermore, a sealing baffle is provided on the side of the cover plate away from the rear limiting plate.

[0009] Furthermore, a first baffle is provided on the end surface of the sintering sagger body close to the entrance and below the sealing baffle, and a second baffle is provided on the end surface of the sintering sagger body close to the entrance and at both ends of the sealing baffle.

[0010] Compared with the prior art, the beneficial effects produced by the present invention are: the present invention has a novel structure, ingenious conception, simple and convenient operation, and has the following advantages compared with the prior art: the present invention cooperates with the limiting plate, the first slot, the upper cover plate, the lower cover plate and the second slot structure, and uses the sealing baffle, the first baffle and the second baffle, so that the cover plate and the sintering sagger body can be completely embedded, and a maze path is formed at the same time, which solves the problem of poor sealing due to long-term use of the sagger, increases the service life of the sintering sagger body, and can greatly avoid the risk of performance degradation of the zinc oxide varistor due to poor sealing of the sintering sagger body. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 This is a schematic diagram of the split structure of the sintering sagger body and cover plate of the utility model;

[0013] Figure 3 It is a structural schematic diagram of the cover plate of the utility model;

[0014] Figure 4 It is a schematic diagram of the cross-sectional structure of the present utility model.

[0015] In the figure, 1. sintering sagger body; 11. limit plate; 12. first slot; 13. entrance; 2. cover plate; 21. upper cover plate; 22. lower cover plate; 23. second slot; 3. sealing baffle; 4. first baffle; 5. second baffle. DETAILED DESCRIPTION

[0016] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0017] The utility model provides a high-temperature sintering sagger for zinc oxide varistor, comprising a sintering sagger body 1 with an open-end rectangular structure and a cover plate 2 arranged on the top of the sintering sagger body 1, the left side, the right side and the rear side of the top of the open end of the sintering sagger body 1 are fixedly connected to a limiting plate 11, the limiting plate 11 and the sintering sagger body 1 are an integrally formed structure, which can improve the strength of its structure, and a first card groove 12 is provided on the inner wall of the lower part of the limiting plate 11, the first card groove 12 and the top surface of the sintering sagger body 1 form a groove structure for fitting the cover plate 2, the first card groove 12 on the limiting plate 11 is connected in sequence, and the cover plate 2 is arranged in the first card groove 11, the first card slot 12 on the left and right limit plates 11 is provided with an entrance 13 of the cover plate 2 on the side away from the rear limit plate 11, and the cover plate 2 includes an upper cover plate 21 and a lower cover plate 22, the upper cover plate 21 is arranged on the top of the lower cover plate 22, and the left side, right side and rear side of the lower cover plate 22 are respectively arranged in the first card slot 12, and the upper part of the left outer side, right outer side and rear outer side of the lower cover plate 22 is provided with a second card slot 23 that is connected in sequence, and the second card slot 23 and the bottom surface of the upper cover plate 21 form a groove structure for the embedded limit plate 11, and the part of the limit plate 11 protruding from the first card slot 11 is arranged in the second card slot 23.

[0018] like Figure 1 As shown, a zinc oxide varistor is placed in the sintering sagger body 1, and the cover plate 2 is inserted into the first slot 11 from the entrance 13. Specifically, the left and right sides of the lower cover plate 22 are respectively inserted into the first slots 12 on the left and right limit plates 11 from the entrance 13, and the protruding parts of the left and right limit plates 11 relative to the first slots 12 are respectively inserted into the left and right second slots 23 of the lower cover plate 22. The cover plate 2 is slid toward the direction of the rear limit plate 11 so that the rear outer side of the lower cover plate 21 enters the first slot 12 on the rear limit plate 11, and the rear limit plate 1 The portion protruding from the first slot 12 enters into the second slot 23 on the rear outer side of the lower cover 22. The lower cover 22 covers the open end of the sintering sagger body 1. The upper cover 21 is located on the top of the limiting plate 11 and is used to cover the opening on the top of the limiting plate 11. The limiting plate 11, the first slot 12, the upper cover 21, the lower cover 22 and the second slot 23 form a labyrinth seal, which solves the problem of loose sealing due to long-term use of the sintering sagger body 1, increases the service life of the sagger, effectively prevents the volatilization of low-melting-point additives, and ensures the electrical parameters of the zinc oxide varistor.

[0019] The size of the lower cover plate 22 matches the size of the space enclosed by the first slot 12 on the limiting plate 11 , and the size of the space enclosed by the inner wall of the limiting plate 11 protruding from the first slot 12 matches the size of the space enclosed by the second slot 23 .

[0020] like Figure 1 As shown, the lower cover plate 22 can be embedded in the first slot 11 and can be completely embedded in the space enclosed by the first slot 12 to seal the open end of the sintering sagger body 1. The inner wall of the limiting plate 11 protruding from the first slot 12 encloses a space whose size is adapted to the space enclosed by the second slot 23. The sintering sagger body 1 and the cover plate 2 can be completely embedded to achieve a good sealing effect of the sintering sagger body 1.

[0021] A sealing baffle 3 is provided on the side of the cover plate 2 away from the rear limiting plate 11 .

[0022] like Figure 1 As shown, the sealing baffle 3 can be used to improve the sealing performance of the inlet 13.

[0023] A first baffle 4 is provided on the end surface of the sintering sagger body 1 near the inlet 13 and below the sealing baffle 3 , and a second baffle 5 is provided on the end surface of the sintering sagger body 1 near the inlet 13 and at both ends of the sealing baffle 3 .

[0024] like Figure 1 As shown, the first baffle 4 and the second baffle 5 are both integrally formed with the sintering sagger body 1. At the same time, the first baffle 4 and the second baffle 5 are integrally formed, and the first baffle 4 and the two second baffles 5 form a U-shaped structure. During the installation of the cover plate 2, the bottom of the sealing baffle 3 is fitted with the top surface of the first baffle 4, and the end surfaces at both ends of the sealing baffle 3 are fitted with the inner wall end surfaces of the second baffle 5, forming a labyrinth path seal for the end of the sintering sagger body 1 near the entrance 13, which can further improve the sealing effect.

[0025] Principle of use: Insert the cover plate 2 into the first slot 11 from the entrance 13. Specifically, insert the left and right sides of the lower cover plate 22 into the first slots 12 on the left and right limiting plates 11 from the entrance 13 respectively, and the parts of the left and right limiting plates 11 protruding from the first slots 12 enter the second slots 23 on the left and right outer sides of the lower cover plate 22 respectively. Slide the cover plate 2 toward the rear limiting plate 11 until the rear outer side of the lower cover plate 21 enters the first slot 12 on the rear limiting plate 11 and the part of the rear limiting plate 11 protruding from the first slot 12 Enter the second card slot 23 on the rear outer side of the lower cover plate 22. At the same time, the sealing baffle 3 falls between the first baffle 4 and the second baffle 5 to seal the entrance 13 end of the sintering sagger body 1. The limit plate 11, the first card slot 12, the upper cover plate 21, the lower cover plate 22 and the second card slot 23 form a seal on the left, right and rear sides of the open end of the sintering sagger body 1. The front side of the open end of the sintering sagger body 1 is sealed by the sealing baffle 3, the first baffle 4 and the second baffle 5, which can effectively prevent the volatilization of low-melting-point additives and ensure the electrical parameters of the zinc oxide varistor.

[0026] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitute similar methods to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A high-temperature sintering sagger for zinc oxide varistor, characterized by: The invention comprises a sintering sagger body (1) having an open-end rectangular structure and a cover plate (2) arranged on the top of the sintering sagger body (1), wherein limit plates (11) are provided on the left, right and rear sides of the top of the open end of the sintering sagger body (1), and first slots (12) are provided on the inner walls of the lower parts of the limit plates (11), the first slots (12) on the limit plates (11) are connected in sequence, and the first slots (12) on the left and right limit plates (11) are provided with an entrance (13) of the cover plate (2) on the side away from the rear limit plate (11).

2. The high-temperature sintering sagger for zinc oxide varistor according to claim 1, characterized in that: The cover plate (2) comprises an upper cover plate (21) and a lower cover plate (22), the upper cover plate (21) being arranged on the top of the lower cover plate (22), the left side, right side and rear side of the lower cover plate (22) being arranged in the first card slot (12), respectively, the left outer side, right outer side and rear outer side upper part of the lower cover plate (22) being provided with second card slots (23) which are connected in sequence, and the portion of the limit plate (11) protruding from the first card slot (12) being arranged in the second card slot (23).

3. A high-temperature sintering sagger for zinc oxide varistor according to claim 2, characterized in that: The size of the lower cover plate (22) matches the size of the space enclosed by the first slot (12) on the limiting plate (11), and the size of the space enclosed by the inner wall of the limiting plate (11) protruding from the first slot (12) matches the size of the space enclosed by the second slot (23).

4. The high-temperature sintering sagger for zinc oxide varistor according to claim 2, characterized in that: A sealing baffle (3) is provided on the side of the cover plate (2) away from the rear limiting plate (11).

5. The high-temperature sintering sagger for zinc oxide varistor according to claim 4, characterized in that: A first baffle (4) is provided on the end surface of the sintering sagger body (1) on the side close to the inlet (13) and below the sealing baffle (3), and a second baffle (5) is provided on the end surface of the sintering sagger body (1) on the side close to the inlet (13) and at both ends of the sealing baffle (3).

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