Hot pressing sintering mold for bismuth telluride-based powder metallurgy thermoelectric material

Abstract

A hot pressing sintering die for a bismuth telluride-based powder metallurgy thermoelectric material sequentially comprises a die top, a die middle and a die bottom from top to bottom. The mold top comprises a top seat, a pressure mechanism is arranged at the top of the top seat, a pressing rod is arranged below the top seat, and a cushion block is arranged below the pressing rod; the mold middle part comprises a shell and a containing cavity located in the shell, four semicircular side face supporting columns are arranged on the outer side in the containing cavity, and the center position defined by the four side face supporting columns is the position where powder is located; a bottom gasket, a positioning plate and a bottom base are sequentially arranged at the bottom of the die from top to bottom, and a groove is formed in the upper surface of the bottom base. The hot pressing sintering mold is simple, convenient and rapid to operate, the reasonable internal design can prevent the mold from being damaged due to stress concentration under high pressure, and the mold cannot be clamped and is easy to release during demolding.

Description

Technical Field

[0001] The utility model belongs to the field of powder metallurgy hot pressing and sintering, and in particular relates to a powder metallurgy hot pressing and sintering die for bismuth telluride-based thermoelectric materials. Background Art

[0002] Semiconductor thermoelectric materials are a type of green energy material that can utilize the Seebeck and Peltier effects to achieve thermal-electrical energy conversion. Bi2Te3-based thermoelectric materials are the earliest discovered and studied thermoelectric materials, and are also one of the most mature commercial thermoelectric materials to date. They have been widely used in micro-area refrigeration, precision temperature control and other fields, and have great development prospects.

[0003] Compared with the traditional zone melting method for preparing bismuth telluride, the powder metallurgy method has the characteristics of simple operation, short time and high efficiency. The bismuth telluride products produced have the advantages of fine grains, high density, good mechanical properties and easy cutting. They have extremely broad application prospects in various laser transmitters, optical receivers, etc. However, in the preparation process of powder metallurgy, problems such as difficulty in mold demoulding and short mold service life often occur, which leads to reduced product production efficiency and increased production costs. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the problem of demoulding difficulty in the prior art, the utility model provides a convenient, safe and reasonable hot pressing sintering mold for bismuth telluride-based powder metallurgy thermoelectric materials.

[0005] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0006] A hot pressing sintering mold for bismuth telluride-based powder metallurgy thermoelectric material, comprising, from top to bottom, a mold top, a mold middle, and a mold bottom;

[0007] The top of the mold includes a top seat, a pressure mechanism is arranged on the top of the top seat, a pressure rod is arranged below the top seat, and a cushion block is arranged below the pressure rod;

[0008] The middle part of the mold includes a shell and a cavity in the shell, and four semicircular side pillars are arranged on the outside of the cavity, and the center position surrounded by the four side pillars is the position of the powder;

[0009] The bottom of the mold is composed of a bottom gasket, a positioning plate and a bottom base from top to bottom, wherein a groove is arranged on the upper surface of the bottom base.

[0010] A recess is arranged at the center of the top seat, and the four corners of the recess are designed with rounded corners, and the recess is directly opposite to the pressure rod.

[0011] In the bottom of the mold, the periphery of the groove adopts a rounded corner structure.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the utility model can conveniently and quickly load the powder into the mold, and the reasonable internal design of the mold can effectively prevent the mold from being damaged during the sintering process. The hot pressing sintering mold designed by the utility model is easy and quick to operate, and the reasonable internal design can prevent the mold from being damaged due to stress concentration under high pressure, and the mold will not get stuck during demolding and can be easily removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of the sintering mold in the utility model;

[0014] Figure 2 It is the top schematic diagram of the sintering mold;

[0015] Figure 3 It is a schematic diagram of the top seat of the sintering mold;

[0016] Figure 4 It is a schematic diagram of the middle part of the sintering mold;

[0017] Figure 5 is a schematic diagram of the bottom of the sintering mold;

[0018] Figure 6 It is an overall stereogram of the utility model. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] like Figure 1 — Figure 6 As shown, a hot pressing sintering mold for bismuth telluride-based powder metallurgy thermoelectric materials includes, from top to bottom, a mold top 1, a mold middle 2 and a mold bottom 3.

[0022] The mold top 1 includes a top seat 11, a pressure mechanism is arranged on the top of the top seat 11, a pressure rod 12 is arranged below the top seat 11, and a cushion block 13 is arranged below the pressure rod 12. The top seat 11 is responsible for bearing the pressure during the mold sintering process, and the pressure rod 12 is responsible for providing pressure to the sintered powder.

[0023] Furthermore, due to the problem of stress concentration, ordinary molds are easily damaged under high pressure. Therefore, in the utility model, a recess 14 is provided at the center of the top seat 11, and the four corners of the recess 14 are designed with rounded corners. The recess 14 is opposite to the pressure rod 12, which can effectively avoid stress concentration under high pressure and effectively increase the service life of the mold.

[0024] The middle part 2 of the mold includes a shell 21 and a cavity 22 located in the shell 21. Before sintering the powder, the powder needs to be loaded into the center of the middle part of the mold, that is, into the cavity 22.

[0025] Preferably, four semicircular side pillars 23 are arranged outside the cavity 22, and the center position surrounded by the four side pillars 23 is the position of the powder. The center of the mold adopts a circular design to facilitate mold demolding, and the four side pillars 23 at the center are designed separately, which can be removed separately during demolding to avoid mold jamming, which is convenient and quick.

[0026] The bottom 3 of the mold is composed of a bottom gasket 31, a positioning plate 32 and a bottom base 33 from top to bottom, wherein a groove is provided on the upper surface of the bottom base 33, and the periphery of the groove also adopts a rounded structure to avoid stress concentration under high pressure and thus damage to the mold.

[0027] like Figure 6 As shown, the method of using the utility model is:

[0028] 1. Place the mold bottom 3 on the platform: first place the bottom gasket 31 on the platform, and then place the positioning plate 32 and the bottom gasket 31 in the groove at the center of the bottom gasket 31 in sequence;

[0029] 2. Place the middle part 2 of the mold on the bottom 3 of the mold, first place the side support 23, and then put the outer shell 21 into it;

[0030] 3. Pour the required sintering powder into the cavity 22 of the middle part 2 of the mold;

[0031] 4. After pouring the powder, first use the pressing rod 12 to compact the sintered powder. After the powder is compacted, place the cushion block 13 on top of the sintered powder, and then place the pressing rod 12 on the cushion block 13;

[0032] 5. Finally, the top seat 11 is covered, and the pressure mechanism on the top starts to apply pressure from top to bottom.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A hot pressing sintering mold for bismuth telluride-based powder metallurgy thermoelectric materials, characterized in that: From top to bottom, it includes a mold top (1), a mold middle (2) and a mold bottom (3); The mold top (1) comprises a top seat (11), a pressure mechanism is arranged on the top of the top seat (11), a pressure rod (12) is arranged below the top seat (11), and a cushion block (13) is arranged below the pressure rod (12); The middle part (2) of the mold comprises an outer shell (21) and a cavity (22) located in the outer shell (21), and four semicircular side pillars (23) are arranged on the outside of the cavity (22), and the center position surrounded by the four side pillars (23) is the position where the powder is located; The bottom (3) of the mold comprises, from top to bottom, a bottom gasket (31), a positioning plate (32) and a bottom base (33), wherein a groove is provided on the upper surface of the bottom base (33).

2. The hot pressing sintering mold for bismuth telluride-based powder metallurgy thermoelectric material according to claim 1, characterized in that: A recess (14) is provided at the center of the top seat (11), the four corners of the recess (14) are rounded, and the recess (14) is directly opposite to the pressure rod (12).

3. The hot pressing sintering mold for bismuth telluride-based powder metallurgy thermoelectric material according to claim 1, characterized in that: In the bottom (3) of the mold, the periphery of the groove adopts a rounded corner structure.

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