Ultrasonic vibration assisted microwave sintering device

Abstract

The utility model relates to the technical field of ultrasonic microwave-assisted sintering, in particular to an ultrasonic vibration-assisted microwave sintering device. The ultrasonic vibration auxiliary microwave sintering device comprises a rack, a microwave oven cavity, a mold, an ultrasonic vibration mechanism and a one-way pressure mechanism, the microwave oven cavity is fixed to the upper end of the rack through a fixing support, the mold is arranged in the microwave oven cavity, the ultrasonic vibration mechanism is arranged above the microwave oven cavity, and the one-way pressure mechanism is arranged above the mold. The ultrasonic vibration mechanism is provided with a tool head, the upper end of the microwave oven cavity is provided with a channel allowing the tool head to enter, and the driving end of the one-way pressure mechanism is in transmission connection with the ultrasonic vibration mechanism and used for driving the ultrasonic vibration mechanism to move up and down. And the tool head extends into the microwave oven cavity to be close to or far away from the mold. The sintering device disclosed by the utility model can obviously improve the production efficiency and is beneficial to sintering products with uniform structures and stable performance.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic microwave assisted sintering technology, and in particular to an ultrasonic vibration assisted microwave sintering device. Background Technology

[0002] Currently, the most commonly used sintering technique in hot pressing sintering is atmospheric pressure sintering, which involves heating powder or pressed blanks to a certain temperature in an atmospheric environment, causing the particles to bond and transfer mass, ultimately forming a dense sintered body. However, this method has some significant drawbacks. Many ceramic and metallic materials require extremely high temperatures to achieve complete sintering, which not only places high demands on heating equipment and increases energy consumption, but may also lead to adverse phenomena such as grain growth and phase transformation at high temperatures, thus affecting the material's properties. Furthermore, for some difficult-to-sinter materials, such as high-melting-point ceramics and nanomaterials, atmospheric pressure sintering often fails to achieve the desired density.

[0003] In response to this phenomenon, the present invention aims to provide an ultrasonic vibration-assisted microwave sintering device that combines ultrasonic technology with microwave sintering technology. Utility Model Content

[0004] The purpose of this invention is to provide an ultrasonic vibration-assisted microwave sintering device and a sintering method.

[0005] To achieve the above objectives, this utility model provides an ultrasonic vibration-assisted microwave sintering device, including a frame, a microwave oven cavity, a mold, an ultrasonic vibration mechanism, and a unidirectional pressure mechanism. The microwave oven cavity is fixed to the upper end of the frame by a fixed bracket. The mold is disposed inside the microwave oven cavity. The ultrasonic vibration mechanism is disposed above the microwave oven cavity and is equipped with a tool head. The upper end of the microwave oven cavity is provided with a channel for the tool head to enter its interior. The driving end of the unidirectional pressure mechanism is connected to the ultrasonic vibration mechanism and is used to drive the ultrasonic vibration mechanism to move up and down until the tool head extends into the microwave oven cavity and approaches or moves away from the mold.

[0006] Furthermore, the fixed bracket includes a movable plate and multiple guide columns. The movable plate is slidably mounted on the multiple guide columns. The microwave oven cavity is located below the movable plate. The ultrasonic vibration mechanism is fixed on the movable plate. The one-way pressure mechanism is fixed on the fixed bracket, and its driving end is connected and fixed to the movable plate. The one-way pressure mechanism drives the movable plate to move the ultrasonic vibration mechanism up and down.

[0007] Furthermore, the microwave oven cavity is provided with a heat-insulating pressure head, the mold is fixed to the upper end of the heat-insulating pressure head, and the bottom of the microwave oven cavity is provided with a metal top column.

[0008] Furthermore, the ultrasonic vibration mechanism includes an ultrasonic transducer, an ultrasonic concentrator, and the tool head connected in sequence. The ultrasonic vibration mechanism is fixed on the movable plate. The upper end of the microwave oven cavity is provided with a corrugated pipe communicating with its interior. The end of the corrugated pipe away from the microwave oven cavity is connected and fixed to the movable plate. The tool head is located inside the corrugated pipe.

[0009] Furthermore, the unidirectional pressure mechanism includes a servo electric cylinder, the drive end of which is provided with a pressure head protective cover. The pressure head protective cover covers the ultrasonic transducer and is connected and fixed to the upper end of the moving plate. The servo electric cylinder drives the pressure head protective cover to move the moving plate and the ultrasonic transducer along the axial direction of the multiple guide columns.

[0010] Furthermore, a pressure detection unit is provided at the upper end of the pressure head protective cover.

[0011] Furthermore, the pressure detection unit is a pressure sensor.

[0012] Furthermore, the guide post is provided with four posts.

[0013] The beneficial effects of this invention are as follows: Compared with traditional sintering devices, the ultrasonic vibration-assisted microwave sintering device of this invention can significantly improve production efficiency. The microwave field is distributed more uniformly within the material, enabling the material to be heated almost synchronously throughout, reducing internal thermal stress caused by temperature gradients, and facilitating the sintering of products with uniform structure and stable performance. Furthermore, the ultrasonic vibration-assisted microwave sintering device of this invention also has advantages such as low implementation cost, simple structure, and convenient operation. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0015] Figure 1 This is a schematic diagram of the structure of an ultrasonic vibration-assisted microwave sintering device according to this utility model;

[0016] Figure 2 This is a schematic diagram of the microwave oven cavity of this utility model;

[0017] Figure 3 This is a schematic diagram of the ultrasonic vibration mechanism of this utility model. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that "multiple" means two or more, unless otherwise explicitly specified.

[0020] Please see Figure 1-3 This utility model provides an ultrasonic vibration-assisted microwave sintering device, including a frame 10, a microwave oven cavity 80, a mold 30, an ultrasonic vibration mechanism, and a one-way pressure mechanism. The microwave oven cavity 80 is fixed to the upper end of the frame 10 by a fixed bracket 40. The mold 30 is disposed inside the microwave oven cavity 80. The ultrasonic vibration mechanism is disposed above the microwave oven cavity 80 and is provided with a tool head 20. The upper end of the microwave oven cavity 80 is provided with a channel for the tool head 20 to enter its interior. The driving end of the one-way pressure mechanism is connected to the ultrasonic vibration mechanism and is used to drive the ultrasonic vibration mechanism to move up and down until the tool head 20 extends into the microwave oven cavity 80 and approaches or moves away from the mold 30.

[0021] In this invention, both the ultrasonic vibration mechanism and the unidirectional pressure mechanism are fixed on the fixed bracket 40. The mold 30 is used to place the sintering material. During sintering, the microwaves in the microwave oven cavity 80 can directly act on the polar molecules inside the material, causing them to vibrate rapidly and generate heat, achieving rapid overall heating of the material and greatly shortening the sintering time. Compared with traditional sintering methods, this significantly improves production efficiency. The microwave field distribution inside the material is relatively uniform, allowing the material to be heated almost synchronously, reducing internal thermal stress caused by temperature gradients, and facilitating the sintering of products with uniform structure and stable performance. The ultrasonic vibration mechanism provides ultrasonic vibration, which promotes the filling of pores between particles, increasing the material's density. The energy generated by ultrasonic vibration also inhibits grain growth, making the material's microstructure more uniform. The increased density, finer and more uniformly distributed grains significantly improve the material's hardness and strength. The ultrasonic vibration mechanism transmits ultrasonic vibration to the sintering material on the mold 30 through the tool head 20, completing ultrasonic vibration-assisted sintering.

[0022] As an embodiment of the present invention, the microwave oven cavity 80 is provided with a heat insulation pressure head 81, the mold 30 is fixed to the upper end of the heat insulation pressure head 81, the bottom of the microwave oven cavity 80 is provided with a metal top column 50, and the upper end is provided with a corrugated pipe 60 communicating with the interior therein. The end of the corrugated pipe 60 away from the microwave oven cavity 80 is connected and fixed to a fixed bracket 40.

[0023] In this invention, the metal top post 50 is fixedly mounted on the fixed bracket 40 to secure the microwave oven cavity 80. The heat-insulating pressure head 81 is used to fix the mold 30 and also to maintain a stable temperature inside the microwave oven cavity 80 during the pressing process. The corrugated pipe 60 is used to prevent microwave energy leakage inside the microwave oven cavity 80.

[0024] As an embodiment of the present invention, the ultrasonic vibration mechanism includes an ultrasonic transducer 21, an ultrasonic concentrator 22 and a tool head 20 connected in sequence, the tool head 20 being located inside the bellows 60; the ultrasonic transducer 21 is connected to the drive end of the unidirectional pressure mechanism.

[0025] In this invention, the ultrasonic transducer 21 provides ultrasonic vibration. Based on the piezoelectric or magnetostrictive effect, the ultrasonic transducer 21 converts the received ultrasonic electrical signal into a mechanical vibration signal and outputs it to the ultrasonic concentrator 22. The ultrasonic concentrator 22 amplifies the amplitude of the received mechanical vibration signal and focuses the energy. The enhanced mechanical vibration signal from the ultrasonic concentrator 22 acts on the material to be sintered through the tool head 20. Ideally, the ultrasonic transducer 21, ultrasonic concentrator 22, tool head 20, mold 30, heat-insulating pressure head 81, and metal top column 50 are all coaxially arranged, which ensures uniform force distribution on the mold 30 and improves the overall stability of the device.

[0026] In another embodiment of this utility model, the fixed bracket 40 includes a movable plate 41 and multiple guide columns 42. The movable plate 41 is slidably mounted on the multiple guide columns 42. The ultrasonic transducer 21 is fixedly mounted on the movable plate 41. The unidirectional pressure mechanism is located at the upper end of the fixed bracket 40 and includes a servo cylinder 70. The driving end of the servo cylinder 70 is provided with a pressure head protective cover 71. The pressure head protective cover 71 covers the ultrasonic transducer 21 and is connected and fixed to the upper end of the movable plate 41. The servo cylinder 70 drives the pressure head protective cover 71 to move the movable plate 41 and the ultrasonic transducer 21 along the axial direction of the multiple guide columns 42.

[0027] In this invention, when the servo electric cylinder 70 drives the pressure head protective cover 71, which in turn moves the moving plate 41 and the ultrasonic transducer 21 along the axial direction of the multiple guide columns 42, the tool head 20 can move closer to or further away from the mold 30. Ideally, there are four guide columns 42, and the ultrasonic concentrator 22 is connected and fixed to the moving plate 41 via a flange. This invention's unidirectional pressure mechanism has advantages such as a straight driving trajectory, high driving efficiency, simple structure, and low implementation cost.

[0028] In another embodiment of this utility model, the upper end of the pressure head protective cover 71 is provided with a pressure detection unit, which is a pressure sensor 72.

[0029] In this invention, the pressure sensor 72 is used to detect the pressure applied by the unidirectional pressure mechanism to the ultrasonic vibration mechanism, thereby ensuring the sintering effect of the ultrasonic vibration-assisted microwave sintering process.

[0030] The sintering method of the ultrasonic vibration-assisted microwave sintering device of this invention includes the following steps:

[0031] (1) Confirm that all components of the sintering device are working properly, open the oven door of the microwave oven cavity 80, place the mold 30 containing the material to be sintered on the heat insulation pressure head 81, and close the oven door.

[0032] (2) According to the sintering process requirements of the material to be sintered, the microwave oven cavity 80 is evacuated and a protective gas is introduced; specifically, as another embodiment, ultrasonic vibration-assisted microwave sintering can also be carried out directly under air conditions;

[0033] (3) By controlling the one-way pressure mechanism, the tool head 20 is slowly pressed down until it comes into contact with the powder to be sintered in the mold 30; when the tool head 20 comes into contact with the powder to be sintered, the ultrasonic vibration mechanism is activated and the tool head 20 begins to press down until the pressure required for the material to be sintered is reached.

[0034] (4) Microwave sintering is started by controlling the microwave oven cavity 80 after the tool head 20 applies the target pressure to the material to be sintered, so that the material to be sintered is heated.

[0035] (5) After sintering, turn off the ultrasonic vibration mechanism and microwave oven cavity 80, control the one-way pressure mechanism to slowly release the pressure, and then use the cooling water circulation system to cool down the microwave oven cavity 80.

[0036] (6) After the pressure is completely released and the temperature inside the furnace drops to room temperature, open the furnace door, take out the sintering mold 30, clean the inside of the microwave oven cavity 80, close all parts, and the sintering is completed.

[0037] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. An ultrasonic vibration-assisted microwave sintering apparatus, characterized by comprising: The utility model relates to a microwave cavity moulding machine, which comprises a frame, a microwave cavity, a mould, an ultrasonic vibration mechanism and a one-way pressure mechanism.

2. The ultrasonic vibration-assisted microwave sintering device according to claim 1, characterized in that, The fixed support comprises a moving plate and a plurality of guide columns, the moving plate is slidably installed on the guide columns, the microwave cavity is arranged below the moving plate, the ultrasonic vibration mechanism is fixed on the moving plate, and the one-way pressure mechanism is fixed on the fixed support, with its driving end connected to the moving plate.

3. The ultrasonic vibration assisted microwave sintering device according to claim 1, wherein, The microwave cavity is provided with a heat insulation pressure head, the mould is fixed on the upper end of the heat insulation pressure head, and the bottom of the microwave cavity is provided with a metal top column.

4. The ultrasonic vibration-assisted microwave sintering device according to claim 2, wherein The ultrasonic vibration mechanism comprises an ultrasonic transducer, an ultrasonic concentrator and a tool head connected in sequence, the ultrasonic concentrator is fixed on the moving plate, the upper end of the microwave cavity is provided with a bellows in communication with the inside of the microwave cavity, one end of the bellows away from the microwave cavity is connected to the moving plate, and the tool head is located in the bellows.

5. The ultrasonic vibration-assisted microwave sintering device according to claim 4, wherein The one-way pressure mechanism comprises a servo cylinder, the driving end of the servo cylinder is provided with a pressure head protection cover, the pressure head protection cover covers the outside of the ultrasonic transducer and is fixed on the upper end of the moving plate, and the servo cylinder drives the pressure head protection cover to drive the moving plate and the ultrasonic transducer to move along the axial direction of the guide columns.

6. The ultrasonic vibration-assisted microwave sintering device according to claim 5, wherein The upper end of the pressure head protection cover is provided with a pressure detection unit.

7. The ultrasonic vibration-assisted microwave sintering device according to claim 6, wherein The pressure detection unit is a pressure sensor.

8. The ultrasonic vibration assisted microwave sintering device according to claim 2, wherein, The guide columns are four in number.

Images