A gas mixing device for silicon powder nitriding

Abstract

The utility model discloses a kind of gas mixing devices of silicon powder nitridation, including gas mixing tank, buffer tank being arranged at the top of gas mixing tank, and gas inlet assembly being arranged at the both sides of gas mixing tank, wherein, gas mixing tank is connected between buffer tank by communicating part, gas mixing tank is communicated between gas inlet assembly by spiral conduit, to make by spiral conduit strengthen the shear between gas into gas mixing tank, guide gas diffusion mixing, by spiral conduit can form intense rotary motion (eddy current) in the flow process of gas source along gas inlet assembly into gas mixing tank, similar to the design of the double helix structure of DNA makes fluid in flow process simultaneously receive two directions spiral guide, form more complex vortex field, to improve mixing quality.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature nitriding furnace synthesis of silicon nitride packaging technology, and in particular to a gas mixing device for silicon powder nitriding. Background Technology

[0002] Silicon nitride ceramics possess excellent physical and chemical properties, such as high strength, high hardness, high temperature resistance, wear resistance, chemical corrosion resistance, and self-lubrication. They are widely used in steel, chemical, power, aerospace, and military industries.

[0003] Among them, silicon nitride powder, as the raw material for silicon nitride ceramics, is mainly synthesized by methods such as direct silicon powder nitridation, carbothermal reduction of silicon dioxide, self-propagating synthesis, chemical vapor deposition, and silimide decomposition.

[0004] Currently, the direct nitriding method for silicon powder is widely used due to its simplicity and low cost. This method uses silicon powder as raw material, which undergoes a nitriding reaction with a nitrogen-containing atmosphere in a high-temperature nitriding synthesis furnace to form silicon nitride. Typically, the nitrogen-containing atmosphere is not a single nitriding gas but contains multiple gases, and the degree of gas mixing directly affects the degree of silicon powder nitriding. However, current mixing containers only serve to guide the gas flow, resulting in poor mixing quality as the mixed gases are concentrated in a single container. Therefore, designing a suitable gas mixing device for the direct nitriding synthesis of silicon nitride powder is the technical problem that this application aims to solve. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a mixing device for silicon powder nitriding, which aims to solve the problem of poor mixing quality in the current mixing devices for silicon powder nitriding.

[0006] The present invention provides a mixing device for silicon powder nitriding, comprising a mixing tank, a buffer tank disposed on the top of the mixing tank, and air inlet components disposed on both sides of the mixing tank.

[0007] The mixing tank and the buffer tank are connected by a connecting member, and the mixing tank and the air intake assembly are connected by a spiral conduit, so as to enhance the shear between the gases introduced into the mixing tank through the spiral conduit and guide the gas diffusion and mixing.

[0008] As described above, the spiral conduit allows the gas source introduced into the mixing tank along the air intake assembly to form a strong rotational motion (vortex) during the flow process. Similar to the double helix structure of DNA, this design allows the fluid to be guided by helical currents in two directions simultaneously during the flow process, forming a more complex vortex field to improve the mixing quality. At the same time, the spiral conduit is provided with two through holes inside the mixing tank, arranged in an alternating pattern. This allows the gas source to form opposing and convective vortex fields in the upper and lower regions of the mixing tank along the current spiral conduit trajectory when it enters the mixing tank. This can further improve the mixing quality between gases and solve the problem of poor mixing quality in the current silicon powder nitriding mixing device.

[0009] In addition, the mixing device for silicon powder nitriding according to the embodiments of this utility model may also have the following additional technical features:

[0010] Furthermore, the air intake assembly includes a first air intake component located on one side of the mixing tank, and a second air intake component located on the side of the mixing tank away from the first air intake component.

[0011] Furthermore, a first air intake pipe extends outward from the side of the first air intake component away from the mixing tank, and a first air intake valve is embedded at the air intake port of the first air intake pipe.

[0012] Furthermore, a second air intake pipe extends outward from the side of the second air intake component away from the mixing tank, and a second air intake valve is embedded at the air intake port of the second air intake pipe.

[0013] Furthermore, both the first air intake component and the second air intake component are connected to the mixing tank through the spiral conduit. The spiral conduit on the first air intake component and the spiral conduit on the second air intake component form a double spiral air intake system, and the two air outlets of the double spiral air intake system are respectively arranged on the upper and lower sides of the mixing tank.

[0014] Furthermore, the connecting element includes a connecting pipe for connecting the buffer tank and the mixing tank, and a second valve embedded in the connecting pipe.

[0015] Furthermore, at least one vent pipe extends outward from the side of the buffer tank away from the connecting member, and a first valve is embedded in the vent pipe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a gas mixing device for silicon powder nitridation proposed in an embodiment of this utility model.

[0017] Explanation of key component symbols:

[0018]

[0019] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0020] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Please see Figure 1 The image shows a mixing device for silicon powder nitriding in an embodiment of this utility model. It includes a mixing tank 6, a buffer tank 3 disposed on the top of the mixing tank 6, and air inlet components disposed on both sides of the mixing tank 6. The mixing tank 6 and the buffer tank 3 are connected by a connecting member, and the mixing tank 6 and the air inlet components are connected by a spiral conduit to enhance the shear between the gases entering the mixing tank 6 through the spiral conduit and guide the gas diffusion and mixing. Both the mixing tank 6 and the buffer tank 3 are cylindrical. The height-to-diameter ratio of the mixing tank 6 is 1~1.5:1, and the height-to-diameter ratio of the buffer tank 3 is 1:1. Both the mixing tank 6 and the buffer tank 3 are made of stainless steel.

[0024] Furthermore, the air intake assembly includes a first air intake component 9 located on one side of the mixing tank 6, and a second air intake component 12 located on the side of the mixing tank 6 away from the first air intake component 9. A first air intake pipe 8 extends outward from the side of the first air intake component 9 away from the mixing tank 6, and a first air intake valve 7 is embedded at the air intake port of the first air intake pipe 8. A second air intake pipe 11 extends outward from the side of the second air intake component 12 away from the mixing tank 6, and a second air intake valve 10 is embedded at the air intake port of the second air intake pipe 11. Both the first air intake component 9 and the second air intake component 12 are connected to the mixing tank 6 through spiral conduits. The connecting element comprises a spiral duct on the first air intake 9 and a spiral duct on the second air intake 12, which together with the mixing tank 6 to form a double-spiral air intake system. The spiral ducts are tangential to the inner wall of the mixing tank, and the two air outlets of the double-spiral air intake system are respectively located on the upper and lower sides of the mixing tank 6. It should be noted that the double-spiral air intake duct is a device that uses a double-spiral structure to enhance the airflow characteristics. Its core principle is to use a spiral air passage design to make the fluid (such as air or fuel gas) form a strong rotational motion (vortex) during the flow process, similar to the double helix structure of DNA. This design allows the fluid to be guided by spirals in two directions simultaneously during the flow process, forming a more complex vortex field to improve the mixing quality. The connecting element includes a connecting pipe 5 for connecting the buffer tank 3 and the mixing tank 6, and a second valve 4 embedded in the connecting pipe 5. At least one air outlet pipe 2 extends outward from the side of the buffer tank 3 away from the connecting element, and the first valve 1 is embedded in the air outlet pipe 2.

[0025] In specific implementation, firstly, the operator can connect the two gas sources to be mixed via connecting conduits to the first inlet pipe 8 and the second inlet pipe 11, respectively. In some optional embodiments, the pipe connection can be a sleeve or a screw connection via a double-port adapter, as understood by those skilled in the art. Then, the operator can perform the gas source mixing operation, simultaneously opening the first inlet valve 7 and the second inlet valve 10. During the process, to ensure sufficient mixing of the gas sources in the mixing tank 6, the second valve 4 is temporarily not opened to ensure that the gas sources are fully affected by the spiral vortex field within the mixing tank 6, thereby fully agitating the gas and improving the mixing quality. Furthermore, the double-spiral inlet system in this application also employs an alternating vertical through-hole arrangement within the mixing tank 6, while the first inlet component 9 and the second... The spiral duct in the second air inlet 12 has a reverse spiral trajectory, which causes the gas source to form opposing and convective vortex fields above and below the mixing tank 6 along the current spiral duct trajectory when it enters the mixing tank 6. This can further improve the mixing quality between the gases. After a preset mixing time, the operator can open the second valve 4 to guide the mixed gas into the buffer tank 3 to wait for the subsequent gas supply operation to the high-temperature nitriding furnace by the buffer tank 3. At the same time, the operator can also continuously introduce the mixed gas source into the mixing tank 6 to ensure the continuity of the gas introduction, mixing and export process. Finally, the operator can open the first valve 1 to guide the mixed gas in the buffer tank 3 into the high-temperature nitriding furnace along the gas outlet pipe 2 to prepare silicon nitride powder.

[0026] In summary, the spiral conduit allows the gas source introduced into the mixing tank 6 along the air intake assembly to form a strong rotational motion (vortex) during the flow process. Similar to the double helix structure of DNA, this design allows the fluid to be guided by helical currents in two directions simultaneously during the flow process, forming a more complex vortex field to improve the mixing quality. At the same time, the spiral conduit is provided with two through holes in the mixing tank 6, arranged in an alternating pattern. This allows the gas source to form opposing and convective vortex fields in the upper and lower regions of the mixing tank 6 along the current spiral conduit trajectory when it enters the mixing tank 6. This can further improve the mixing quality between gases and solve the problem of poor mixing quality in the current silicon powder nitriding mixing device.

[0027] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A mixing device for silicon powder nitriding, characterized in that, It includes a mixing tank, a buffer tank disposed on top of the mixing tank, and air intake assemblies disposed on both sides of the mixing tank; The mixing tank and the buffer tank are connected by a connecting member, and the mixing tank and the air intake assembly are connected by a spiral conduit, so as to enhance the shear between the gases introduced into the mixing tank through the spiral conduit and guide the gas diffusion and mixing.

2. The mixing device for silicon powder nitriding according to claim 1, characterized in that, The air intake assembly includes a first air intake located on one side of the mixing tank, and a second air intake located on the side of the mixing tank away from the first air intake.

3. The mixing device for silicon powder nitriding according to claim 2, characterized in that, The first air intake component extends outward from the side away from the mixing tank to form a first air intake pipe, and a first air intake valve is embedded at the air intake port of the first air intake pipe.

4. The mixing device for silicon powder nitriding according to claim 3, characterized in that, The second air intake component extends outward from the side away from the mixing tank to form a second air intake pipe, and a second air intake valve is embedded at the air intake port of the second air intake pipe.

5. The mixing device for silicon powder nitriding according to claim 4, characterized in that, Both the first air intake component and the second air intake component are connected to the mixing tank through the spiral conduit. The spiral conduit on the first air intake component and the spiral conduit on the second air intake component form a double spiral air intake system, and the two air outlets of the double spiral air intake system are respectively set on the upper and lower sides of the mixing tank.

6. The mixing apparatus for silicon powder nitriding according to claim 5, characterized in that, The connecting component includes a connecting pipe for connecting the buffer tank and the mixing tank, and a second valve embedded in the connecting pipe.

7. The mixing apparatus for silicon powder nitriding according to claim 6, characterized in that, At least one vent pipe extends outward from the side of the buffer tank away from the connecting member, and a first valve is embedded in the vent pipe.

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