Efficient sintering furnace for low-temperature difference high-temperature alloy crucible

Abstract

The application relates to the technical field of sintering equipment, in particular to a high-efficiency sintering furnace for low-temperature-difference high-temperature alloy crucibles, which effectively improves the heat distribution in a furnace cavity, reduces the temperature difference in the furnace cavity, makes the high-temperature alloy crucible evenly heated in each part, and improves the performance consistency of the crucible after sintering. The composite heat preservation structure enhances the heat preservation effect of the furnace body through the synergistic effect of each layer, reduces the heat loss in the heating process, reduces the energy consumption, shortens the time for heating to the target temperature, and improves the sintering efficiency.

Description

Technical Field

[0001] This utility model relates to the field of sintering equipment technology, and in particular to a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible. Background Technology

[0002] High-temperature alloy crucibles are widely used in industrial production, and their sintering quality directly affects their subsequent performance. Currently, sintering furnaces used for high-temperature alloy crucible sintering mostly employ heating components mounted on the outside of the furnace body. However, with this heating method, heat transfer within the furnace cavity is easily affected by factors such as air convection, resulting in significant temperature differences at different locations within the furnace cavity. Especially near the crucible, the temperature uniformity is poor, leading to noticeable variations in the density, strength, and other properties of the high-temperature alloy crucible after sintering, thus affecting the overall quality of the crucible.

[0003] Meanwhile, the existing sintering furnace wall insulation structure is mostly a single insulation layer, with limited insulation effect. During the heating process, the furnace body loses heat quickly, which not only increases energy consumption but also requires a longer heating time to reach the target temperature required for sintering, seriously affecting sintering efficiency. Utility Model Content

[0004] The main objective of this invention is to propose a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible, comprising a furnace body, a furnace cavity formed inside the furnace body, a furnace door on the furnace body, a crucible placement seat inside the furnace cavity, a heating component on the outside of the furnace body, a heat homogenizing component inside the furnace cavity, the heat homogenizing component surrounding the crucible placement seat, the furnace wall of the furnace body being a composite insulation structure, and a temperature monitoring component inside the furnace cavity, the temperature monitoring component being electrically connected to an external temperature control device.

[0006] As a further description of the above technical solution, the heat spreader assembly includes a heat spreader plate, a flow guide plate, and two connecting pieces. The heat spreader plate has an annular structure and is arranged around the outer periphery of the crucible placement seat. The flow guide plate is evenly distributed on the side of the heat spreader plate facing the crucible placement seat and is fixedly connected to the heat spreader plate. The two connecting pieces are respectively fixedly arranged on the two side walls of the furnace cavity and their other ends are fixedly connected to the heat spreader plate.

[0007] As a further description of the above technical solution, the guide plate has a sheet-like structure and extends radially from the heat spreader towards the crucible placement seat.

[0008] As a further description of the above technical solution, the composite insulation structure includes, from the inside out, a high-temperature resistant insulation layer, a vacuum insulation layer, and an insulation cotton layer. The high-temperature resistant insulation layer is made of mullite bricks, and the vacuum insulation layer has a supporting frame inside.

[0009] As a further description of the above technical solution, the temperature monitoring component includes at least three temperature sensors, which are respectively disposed at the top, middle and bottom of one side wall of the furnace cavity.

[0010] As a further description of the above technical solution, the heating component includes an insulation shell and an electric heating tube. The insulation shell is fixedly fitted on the outside of the furnace body, and the electric heating tube is wound inside the insulation shell and fits against the furnace body. The electric heating tube is electrically connected to the temperature control device.

[0011] As a further description of the above technical solution, a heat insulation pad is laid on the upper surface of the crucible placement seat, and the heat insulation pad is made of alumina fiber.

[0012] As a further description of the above technical solution, a sealing strip is provided at the connection between the furnace door and the furnace body.

[0013] As a further description of the above technical solution, the furnace door is connected to the furnace body by bolts at its four corners.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By setting up a heat spreader, the heat spreader plate can evenly diffuse heat, and the heat guide plate directs heat to the crucible, which effectively improves the heat distribution in the furnace cavity, reduces the temperature difference in the furnace cavity, makes the high-temperature alloy crucible heatd evenly in all parts, and improves the performance consistency of the crucible after sintering.

[0016] 2. The composite insulation structure enhances the insulation effect of the furnace body through the synergistic effect of each layer, reduces heat loss during the heating process, lowers energy consumption, and shortens the time to heat to the target temperature, thereby improving sintering efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the furnace body of a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to the present invention.

[0019] Figure 3 This is a schematic diagram of the homogenizing component structure of a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to this utility model.

[0020] Figure 4This is a schematic diagram of the heat insulation pad structure of a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to this utility model.

[0021] Figure 5 This is a schematic diagram of the disassembled structure of the furnace door and furnace body of a high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to this utility model.

[0022] In the diagram: 1. Furnace body; 2. Furnace door; 3. Crucible placement seat; 4. Heating assembly; 5. Heat spreader assembly; 6. Temperature monitoring assembly; 51. Heat spreader plate; 52. Flow guide plate; 53. Connector; 11. High-temperature resistant insulation layer; 12. Vacuum insulation layer; 13. Insulation cotton layer; 61. Temperature sensor; 41. Insulation shell; 42. Electric heating tube; 31. Insulation pad; 7. Sealing strip; 21. Bolt. Detailed Implementation

[0023] To make the technical means, creative features, and objectives of this utility model easier to understand, the following describes this utility model in conjunction with specific embodiments.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed 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 an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0027] This application discloses a high-efficiency sintering furnace for a low-temperature differential high-temperature alloy crucible. For example... Figure 1 and Figure 2As shown, the furnace includes a furnace body 1, with a furnace cavity inside the furnace body 1. A heating component 4 is provided on the outside of the furnace body 1. The heating component 4 includes an insulation sleeve 41 and an electric heating tube 42. The insulation sleeve 41 is fixedly fitted on the outside of the furnace body 1 to reduce the heat loss of the electric heating tube 42 itself and avoid heat waste. The electric heating tube 42 is wound inside the insulation sleeve 41 and fits in close contact with the furnace body 1, so that heat can be directly and efficiently transferred to the furnace body 1 to ensure rapid heating of the furnace cavity. The electric heating tube 42 is electrically connected to a temperature control device to facilitate subsequent precise temperature control.

[0028] It should be noted that the aforementioned temperature control device is a temperature controller, model AI-8848 / 8888. Its control circuit is common knowledge in this field, so the control method and circuit connection will not be explained in detail in this article.

[0029] Please see Figure 2 and Figure 4 The furnace cavity is equipped with a crucible placement seat 3 for placing high-temperature alloy crucibles to be sintered. The upper surface of the crucible placement seat 3 is covered with a heat insulation pad 31. The heat insulation pad 31 is made of alumina fiber. Alumina fiber has good heat insulation properties, which can prevent the high-temperature alloy crucible from directly contacting the crucible placement seat 3, resulting in localized low temperatures and ensuring uniform heating at the bottom of the crucible.

[0030] Please see Figure 5 The furnace body 1 is equipped with a furnace door 2 for sealing and opening the furnace cavity, facilitating the placement and removal of high-temperature alloy crucibles. A sealing strip 7 is provided at the connection between the furnace door 2 and the furnace body 1 to fill the gap between the furnace door 2 and the furnace body 1, preventing heat leakage from the connection and maintaining a stable furnace cavity temperature. The furnace door 2 is connected to the furnace body 1 by bolts 21 set at its four corners. The tightening force ensures that the furnace door 2 and the furnace body 1 fit tightly together, preventing the furnace door 2 from loosening.

[0031] It should be noted that the sealing strip 7 is made of high-temperature resistant silicone rubber.

[0032] Please see Figure 2 and Figure 3The furnace cavity is equipped with a heat homogenizing assembly 5, which surrounds the crucible placement seat 3. The heat homogenizing assembly 5 includes a heat homogenizing plate 51, guide vanes 52, and two connecting parts 53. The heat homogenizing plate 51 has a ring structure and is arranged around the outer periphery of the crucible placement seat 3. The heat homogenizing plate 51 can homogenize the heat transferred to the furnace cavity by the heating assembly 4, so that the heat is more evenly distributed around the crucible placement seat 3, thereby reducing the temperature difference in the furnace cavity. The guide vanes 52 are evenly distributed on the side of the heat homogenizing plate 51 facing the crucible placement seat 3, guiding... The flow guide plate 52 is fixedly connected to the heat spreader plate 51. Two connecting pieces 53 are respectively fixedly installed on the two side walls of the furnace cavity and fixedly connected to the heat spreader plate 51 at the other end. The heat spreader plate 51 is fixed in the furnace cavity to ensure the stability of the heat spreader assembly. The flow guide plate 52 has a sheet-like structure and extends radially from the heat spreader plate 51 toward the crucible placement seat 3. It can guide the heat diffused by the heat spreader plate 51 to the surface of the crucible, avoid the disorderly diffusion of heat inside the furnace cavity, solve the problem of poor temperature uniformity, and ensure that all parts of the crucible are heated evenly.

[0033] It should be noted that the heat spreader 51 is made of graphite with high thermal conductivity, while the guide vane 52 is made of a high-temperature resistant alloy, such as a nickel-based alloy or a molybdenum alloy. The heat spreader 51 first absorbs radiant heat through its surface, and then utilizes the high thermal conductivity of graphite to conduct heat rapidly within the plate, achieving a uniform distribution of heat within the annular area of ​​the heat spreader 51. The guide vane 52 is in close contact with the heat spreader 51 and absorbs heat from the heat spreader 51 through thermal conduction. Because the guide vane 52 extends radially along the heat spreader 51 and faces the crucible, its extension direction forms a perpendicular heat conduction path with the crucible surface, allowing heat to be directly conducted to the outer periphery of the crucible. At the same time, the thermal radiation energy on the surface of the guide vane 52 further covers the top and bottom areas of the crucible, ultimately achieving uniform heating of the entire crucible.

[0034] Please see Figure 2 The furnace wall of furnace body 1 is a composite insulation structure, which, from the inside out, includes a high-temperature resistant insulation layer 11, a vacuum insulation layer 12, and an insulation cotton layer 13. The high-temperature resistant insulation layer 11 is made of mullite brick, and the vacuum insulation layer 12 has a supporting frame. Mullite brick has excellent high-temperature resistance and can directly withstand the high temperature inside the furnace cavity, preventing the furnace wall from being damaged by high temperatures. The vacuum insulation layer 12 reduces the transfer of heat from the furnace cavity to the outside by blocking heat conduction through vacuum, and the supporting frame maintains the stability of the vacuum layer structure and prevents it from collapsing. The insulation cotton layer 13 further blocks the loss of residual heat. The combination of these three elements maximizes the reduction of heat loss from the furnace cavity, thereby reducing energy consumption, shortening the time for the furnace cavity to heat up to the target temperature, and improving sintering efficiency.

[0035] Please see Figure 2The furnace cavity is also equipped with a temperature monitoring component 6, which is electrically connected to an external temperature control device. The temperature monitoring component 6 includes at least three temperature sensors 61, which are respectively set at the top, middle and bottom of one side wall of the furnace cavity. They can collect temperature data at different heights in the furnace cavity in real time and transmit the data to the external temperature control device. Their function is to provide data support for precise temperature control. The temperature control device analyzes the temperature difference between the three temperature sensors 61 to determine whether there is a temperature difference in the furnace cavity. If the temperature in a certain area deviates from the target value, the power of the electric heating tube 42 can be adjusted in time to ensure the overall temperature stability in the furnace cavity and avoid crucible sintering defects caused by local overheating or overcooling.

[0036] It should be noted that the temperature sensor 61 is a type K thermocouple sensor, model WRN-130.

[0037] The implementation principle of the high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible in this application embodiment is as follows: During use, loosen the four corner bolts 21 of the furnace door 2, open the furnace door 2, and place the high-temperature alloy crucible to be sintered stably on the heat insulation pad 31. Close the furnace door 2, and tighten the four corner bolts 21 one by one in diagonal order until there is no obvious gap between the furnace door 2 and the furnace body 1. At this time, the sealing strip 7 is compressed, filling the gap between the furnace door 2 and the furnace body 1, completing the furnace cavity seal. Based on the material characteristics of the high-temperature alloy crucible to be sintered, set parameters such as the target sintering temperature, heating rate, and holding time. This is the basic operation of the temperature controller, so it will not be described in detail here. After starting the equipment, the electric heating tube 42 begins to work, transferring heat to the furnace cavity. At the same time, the heat insulation shell 41 reduces the heat loss of the electric heating tube 42, and the composite heat insulation structure works simultaneously to prevent heat from diffusing outward from the furnace cavity. During the heating process, three temperature sensors 61 collect temperature data in real time, and the temperature control device analyzes the data. If the temperature in a certain area is lower than the target value, the power of the electric heating tube 42 is automatically increased to accelerate heat input. If the temperature in a certain area is too high, the power is reduced. At the same time, the heat spreader 51 absorbs heat in the furnace cavity and diffuses it evenly, and the radially extending guide vanes 52 direct the heat to the surface of the crucible, ensuring that all parts of the crucible are heated evenly. When the set holding time is reached, the temperature control device automatically controls the electric heating tube 42 to stop heating, and the equipment enters the cooling stage. The furnace door 2 is kept closed, and the heat insulation effect of the composite insulation structure is used to slowly cool the furnace cavity, avoiding thermal stress inside the crucible caused by excessive cooling and cracking. The temperature sensors 61 continuously monitor the furnace cavity temperature. After the furnace cavity temperature drops to room temperature or close to room temperature, the bolts 21 at the four corners of the furnace door 2 are loosened, and the furnace door 2 is opened. The sintered high-temperature alloy crucible is carefully removed using a high-temperature resistant clamp. The furnace door 2 is closed, the power supply to the equipment is cut off, and the sintering process is completed.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible, characterized in that, The furnace includes a furnace body (1), which forms a furnace cavity inside the furnace body (1). The furnace body (1) is provided with a furnace door (2). A crucible placement seat (3) is provided inside the furnace cavity. A heating component (4) is provided on the outside of the furnace body (1). The furnace cavity is characterized by having a heat equalization component (5) which surrounds the crucible placement seat (3). The furnace wall of the furnace body (1) is a composite heat preservation structure. A temperature monitoring component (6) is also provided inside the furnace cavity. The temperature monitoring component (6) is electrically connected to an external temperature control device.

2. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 1, characterized in that: The heat spreader assembly (5) includes a heat spreader plate (51), a flow guide plate (52), and two connectors (53). The heat spreader plate (51) has an annular structure and is arranged around the outer periphery of the crucible placement seat (3). The flow guide plate (52) is evenly distributed on the side of the heat spreader plate (51) facing the crucible placement seat (3). The flow guide plate (52) is fixedly connected to the heat spreader plate (51). The two connectors (53) are respectively fixedly arranged on the two side walls of the furnace cavity and their other ends are fixedly connected to the heat spreader plate (51).

3. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 2, characterized in that: The guide plate (52) has a sheet-like structure and extends radially from the heat spreader (51) toward the crucible placement seat (3).

4. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 1, characterized in that: The composite insulation structure includes, from the inside out, a high-temperature resistant insulation layer (11), a vacuum insulation layer (12), and an insulation cotton layer (13). The high-temperature resistant insulation layer (11) is made of mullite brick, and the vacuum insulation layer (12) has a supporting frame inside.

5. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 1, characterized in that: The temperature monitoring component (6) includes at least three temperature sensors (61), which are respectively disposed at the top, middle and bottom of one side wall of the furnace cavity.

6. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 1, characterized in that: The heating component (4) includes an insulation shell (41) and an electric heating tube (42). The insulation shell (41) is fixedly sleeved on the outside of the furnace body (1). The electric heating tube (42) is wrapped inside the insulation shell (41) and fits against the furnace body (1). The electric heating tube (42) is electrically connected to the temperature control device.

7. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 1, characterized in that: The upper surface of the crucible placement seat (3) is covered with a heat insulation pad (31), which is made of alumina fiber.

8. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 1, characterized in that: A sealing strip (7) is provided at the connection between the furnace door (2) and the furnace body (1).

9. The high-efficiency sintering furnace for a low-temperature difference high-temperature alloy crucible according to claim 1, characterized in that: The furnace door (2) is connected to the furnace body (1) by bolts (21) at its four corners.

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