Device for observing sintering of ceramic material in high-temperature furnace

Abstract

The observation device comprises an optical reflection device, a channel, a light source and observation equipment, the optical reflection device comprises a light reflection frame, a sample table is arranged on one side of the light reflection frame, a mirror bracket is arranged on the other side of the light reflection frame, a U-shaped channel is formed in the mirror bracket, and plane lenses are arranged at the upper port and the lower port of the U-shaped channel; reflectors are respectively arranged in the U-shaped channel corresponding to inflection points of the sample table and the channel, and the U-shaped channel is filled with argon; an observation window is formed in a port, close to the outer side of the furnace body, of the channel, a baffle is arranged in the channel and comprises a partition plate dividing the channel into a light channel and an observation channel, and the partition plate extends into the cavity of the hearth and is provided with a reflector; the light source corresponds to the light channel; the observation device is placed corresponding to the observation channel and is connected with an image processing unit. Heat loss in the hearth cavity can be reduced, the stability of the temperature in the hearth is guaranteed, meanwhile, light supplementing can be conducted when light is insufficient, and the observation requirement is met.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature furnace observation, and in particular relates to an observation device for ceramic materials when they are sintered in a high-temperature furnace. Background Art

[0002] When ceramic materials are sintered in a high-temperature furnace, they are usually accompanied by a series of physical and chemical changes such as crystal structure reorganization, gas release, thermal expansion, melting and phase change. These changes have a significant impact on the morphology and thermodynamic properties of ceramic materials. Therefore, by monitoring the morphological changes of ceramic materials, we can have a deeper understanding of the changes in their thermodynamic properties. In experiments to study the changes in thermodynamic properties of ceramic materials during sintering, there is an urgent need for an efficient observation device to monitor and analyze their morphological changes in real time, so as to better explore the changes in their thermodynamic properties.

[0003] At present, the observation of high-temperature furnaces mainly relies on the observation window structure installed on the furnace door. This design is only suitable for observation at lower temperatures, and because the position of the observation window is basically at the same level as the observed object, heat is lost from the observation window, affecting the stability of the temperature in the furnace cavity. When the furnace cavity temperature is lower than 500 degrees Celsius, the internal light is insufficient, making observation difficult. Summary of the invention

[0004] The purpose of the present invention is to provide an observation device for ceramic materials being sintered in a high-temperature furnace, which can reduce heat loss in the furnace cavity and ensure the stability of the temperature in the furnace, and at the same time can provide supplementary light when light is insufficient to meet observation needs.

[0005] To achieve the above-mentioned purpose, the present invention provides an observation device for ceramic materials sintered in a high-temperature furnace, comprising an optical reflection device placed in a furnace cavity, a channel connecting the furnace cavity and the outer side of the furnace body is provided on the rear side of the furnace body, and a light source and observation equipment are provided on the outer side of the furnace body, wherein the optical reflection device comprises a reflection frame, a sample stage is provided on one side of the reflection frame, and a mirror frame is provided on the other side, a U-shaped channel is provided inside the mirror frame, the upper and lower ports of the U-shaped channel correspond to the channel and the sample stage respectively, and both are provided with plane lenses, and reflectors are respectively installed at the inflection points corresponding to the sample stage and the channel in the U-shaped channel, and the U-shaped channel is filled with argon gas;

[0006] The channel is provided with an observation window at the port near the outside of the furnace body, and a baffle is provided inside the channel, the baffle includes a partition that divides the channel into a lower light channel and an upper observation channel, and the partition extends to the furnace cavity and is provided with a reflector inclined toward the sample stage;

[0007] The light source is placed corresponding to the light channel;

[0008] The observation device is placed corresponding to the observation channel and is connected to an image processing unit.

[0009] As a further solution of the present invention: the mirror surface of the reflector on the lower side of the U-shaped channel forms an angle of 45° with the horizontal plane, the mirror surface of the reflector on the lower side of the U-shaped channel is perpendicular to the mirror surface of the reflector on the upper side, the two reflectors are distributed in a straight line in the vertical direction, and each reflector and its corresponding plane lens are distributed in a straight line in the horizontal direction.

[0010] As a further solution of the present invention: the distance from the reflector on the upper side of the U-shaped channel to the corresponding plane lens is greater than the distance from the reflector on the lower side to the corresponding plane lens.

[0011] As a further solution of the present invention: grooves for installing reflectors are provided on the upper and lower sides of the vertical part in the U-shaped channel respectively corresponding to the plane lenses, and protrusions for limiting and fixing the reflectors are provided on the adjacent inner walls of each groove in the U-shaped channel.

[0012] As a further solution of the present invention: the reflective frame is made by sintering hollow alumina ball material.

[0013] As a further solution of the present invention: the reflecting mirror is a tungsten mirror with one side surface polished and chemically treated to produce a mirror effect.

[0014] As a further solution of the present invention: the plane lens and the observation window are both made of transparent quartz glass.

[0015] As a further solution of the present invention: the channel and the baffle are both made of alumina ceramic material.

[0016] As a further solution of the present invention: the partition is parallel to the horizontal plane, and the partition is matched with the channel through a notch.

[0017] As a further solution of the present invention: the reflector on the upper side of the U-shaped channel is distributed in a straight line with the observation channel and the observation equipment in the horizontal direction.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The reflector frame is made of sintered alumina hollow balls, the reflector is made of tungsten material, the baffle is made of alumina ceramics, the plane lens and the observation window are transparent quartz glass, all of which have good high temperature resistance; in addition, the U-shaped channel is filled with argon gas, which can effectively prevent tungsten from oxidizing at high temperatures, so that the observation device can observe objects in the furnace cavity at higher temperatures;

[0020] 2. The U-shaped channel has two ports, the upper and lower ports. The lower port corresponds to the sample table located below the furnace cavity, and the channel corresponds to the upper port. The two ports are spaced apart in the vertical direction, while the cross-sectional area of ​​the channel is small, which reduces heat loss from the channel. In addition, the channel and baffle are made of alumina ceramics, which have a certain thermal insulation capacity, so that the temperature in the furnace cavity remains stable.

[0021] 3. When the temperature in the furnace cavity is low, the brightness is also correspondingly low. At this time, light can be emitted by the light source, and the light is introduced into the furnace cavity through the light channel. The reflector is then used to reflect the light to the sample stage area for supplementary lighting, thereby meeting the observation needs and facilitating observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a side cross-sectional structural schematic diagram of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the reflective frame in the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the middle plate of the present invention.

[0025] In the figure: 1. optical reflection device, 11. reflective frame, 111. mirror frame, 112. sample stage, 113. protrusion, 12. U-shaped channel, 13. reflector, 14. plane lens, 2. channel, 21. light channel, 22. observation channel, 3. baffle, 31. partition, 32. reflector, 4. observation window, 5. light source, 6. observation device, 7. image processing unit. DETAILED DESCRIPTION

[0026] The present invention will be further described below by way of examples.

[0027] like Figures 1 to 3As shown, an observation device for ceramic material sintering in a high-temperature furnace comprises an optical reflection device 1 placed in a furnace cavity, a channel 2 connecting the furnace cavity and the outer side of the furnace body is provided at the rear side of the furnace body, and a light source 5 and an observation device 6 are provided on the outer side of the furnace body. The optical reflection device 1 is placed at the center of the furnace cavity, with the same distance from the left and right furnace walls, and its upper and lower surfaces are substantially flush with the upper and lower surfaces of the furnace cavity to ensure the stability of the optical reflection device 1. The optical reflection device 1 comprises a reflection frame 11, and a sample stage 112 is provided on one side of the reflection frame 11 and a sample stage 112 is provided on the other side. A mirror frame 111 is provided on the side, and a U-shaped channel 12 is provided inside the mirror frame 111. The horizontal section of the vertical part of the U-shaped channel 12 and the vertical section of the horizontal part are equal-sized squares. The upper and lower ports of the U-shaped channel 12 correspond to the channel 2 and the sample stage 112 respectively, and are both provided with a plane lens 14, so that the U-shaped channel 12 is sealed and can resist high temperatures. Reflectors 13 are respectively installed at the inflection points corresponding to the sample stage 112 and the channel 2 in the U-shaped channel 12. The U-shaped channel 12 is filled with argon gas, which can effectively insulate and prevent tungsten from oxidizing at high temperatures;

[0028] An observation window 4 is provided at the port of the channel 2 close to the outer side of the furnace body, and a baffle 3 is provided inside the channel 2. The baffle 3 includes a partition 31 that divides the channel 2 into a lower light channel 21 and an upper observation channel 22. The partition 31 extends to the furnace cavity and is provided with a reflector 32 inclined toward the sample stage 112; the channel 2 maintains a large vertical distance from the heating area at the bottom of the furnace cavity, thereby reducing the heat lost through the channel 2; the reflector 32 can reflect the light emitted by the light source 5 onto the sample to be tested on the sample stage 112, providing the sample with necessary light in a low-light environment;

[0029] The light source 5 is placed corresponding to the light channel 21; the light source 5 is a miniature flashlight that can emit visible light;

[0030] The observation device 6 is placed corresponding to the observation channel 22 and is connected to the image processing unit 7. The observation device 6 can be a camera, and the image processing unit 7 is a computer terminal connected to the observation device 6 through a cable to realize recording and processing of the image taken by the observation device 6.

[0031] Furthermore, the mirror surface of the reflector 13 on the lower side of the U-shaped channel 12 is at an angle of 45° to the horizontal plane, the mirror surface of the reflector 13 on the lower side of the U-shaped channel 12 is perpendicular to the mirror surface of the reflector 13 on the upper side, the two reflectors 13 are distributed in a straight line in the vertical direction, and each reflector 13 and its corresponding plane lens 14 are distributed in a straight line in the horizontal direction, so that the light propagating in the horizontal direction from the lower port of the U-shaped channel 12 can pass through the lower reflector 13 and the upper reflector 13 in turn, and finally be emitted horizontally from the upper port, so as to be collected by the observation device 6.

[0032] In order to reduce the influence of the light in the furnace cavity on the optical reflection device 1 , further, the distance from the upper reflector 13 to the corresponding plane lens 14 in the U-shaped channel 12 is greater than the distance from the lower reflector 13 to the corresponding plane lens 14 .

[0033] Furthermore, grooves for installing the reflector 13 are provided on the upper and lower sides of the vertical part of the U-shaped channel 12 respectively corresponding to the plane lens 14, and the adjacent inner walls of each groove in the U-shaped channel 12 are respectively provided with protrusions 113 for limiting and fixing the reflector 13. The grooves are used to position and install the reflector 13, and the protrusions 113 are used to fix the reflector 13.

[0034] In order to meet the requirements of use in the furnace cavity, the reflector frame 11 is further made of sintered alumina hollow ball material and has the ability to withstand high temperatures.

[0035] Furthermore, the reflector 13 is a tungsten mirror with one side surface polished and chemically treated to produce a mirror effect, and the reflector 13 can reflect light at high temperature.

[0036] Furthermore, the plane lens 14 and the observation window 4 are both made of transparent quartz glass, which will not affect the reflection of light, and can also provide a sealing effect to resist high temperature and reduce heat loss in the furnace cavity.

[0037] Furthermore, the channel 2 and the baffle 3 are both made of alumina ceramic material, so that the channel 2 and the baffle 3 have certain high temperature resistance.

[0038] Furthermore, the partition 31 is parallel to the horizontal plane, and the partition 31 and the channel 2 are matched with each other through a notch.

[0039] Furthermore, the reflector 13 on the upper side of the U-shaped channel 12 is distributed in a straight line with the observation channel 22 and the observation device 6 in the horizontal direction and maintains a certain distance to ensure that the observation device 6 can collect the observation sample image reflected by the reflector on the upper side through the observation window 4.

[0040] The use process of the present invention is as follows: the observation sample is placed on the sample stage 112, and then the optical reflection device 1 is placed in the furnace cavity. The size of the observation sample is required to be smaller than the size of the plane lens 14, and the projection of the observation sample can fall on the mirror surface of the lower reflector 13, and the observation device 6 can collect the image of the observation sample reflected by the upper reflector. When the observation sample is heated to a relatively low temperature, the light in the furnace is insufficient and the object cannot be clearly observed. At this time, light can be emitted by the light source 5, and the light is introduced into the furnace cavity by the light channel 21, and then the light is reflected to the sample stage 112 area by the reflector 32, so as to facilitate observation. When the temperature is high enough, the light in the furnace is sufficient. At this time, the projection of the observation sample falls on the mirror surface of the lower reflector 13, and then passes through the mirror surface of the upper reflector 13, the light channel 21, and the observation window 4, and finally falls on the observation device 6. The observation device 6 transmits the collected image data to the image processing unit 7 for image recording and processing.

Claims

1. An observation device for ceramic material sintering in a high-temperature furnace, comprising an optical reflection device (1) placed in a furnace cavity, a channel (2) connecting the furnace cavity and the outside of the furnace body provided at the rear side of the furnace body, a light source (5) and an observation device (6) provided on the outside of the furnace body, characterized in that: The optical reflection device (1) comprises a reflection frame (11), a sample stage (112) is provided on one side of the reflection frame (11), and a mirror frame (111) is provided on the other side, a U-shaped channel (12) is provided inside the mirror frame (111), the upper and lower ends of the U-shaped channel (12) correspond to the channel (2) and the sample stage (112) respectively, and are both provided with a plane lens (14), reflection mirrors (13) are respectively installed at the inflection points corresponding to the sample stage (112) and the channel (2) in the U-shaped channel (12), and the U-shaped channel (12) is filled with argon gas; The channel (2) is provided with an observation window (4) at the port close to the outer side of the furnace body, and a baffle (3) is provided inside the channel (2), the baffle (3) comprising a partition (31) that divides the channel (2) into a lower light channel (21) and an upper observation channel (22), and the partition (31) extends to the furnace cavity and is provided with a reflector (32) that is inclined toward the sample stage (112); The light source (5) is placed corresponding to the light channel (21); The observation device (6) is placed corresponding to the observation channel (22) and is connected to an image processing unit (7).

2. The device for observing the sintering of a ceramic material in a high temperature furnace according to claim 1, characterized in that: The mirror surface of the reflector (13) on the lower side of the U-shaped channel (12) forms an angle of 45° with the horizontal plane, the mirror surface of the reflector (13) on the lower side of the U-shaped channel (12) is perpendicular to the mirror surface of the reflector (13) on the upper side, the two reflectors (13) are arranged in a straight line in the vertical direction, and each reflector (13) and its corresponding plane lens (14) are arranged in a straight line in the horizontal direction.

3. The device for observing the sintering of a ceramic material in a high temperature furnace according to claim 1 or 2, characterized in that: The distance from the reflector (13) on the upper side of the U-shaped channel (12) to the corresponding plane lens (14) is greater than the distance from the reflector (13) on the lower side to the corresponding plane lens (14).

4. The device for observing the sintering of ceramic materials in a high temperature furnace according to claim 3, characterized in that: Grooves for mounting the reflector (13) are provided on the upper and lower sides of the vertical part in the U-shaped channel (12) respectively corresponding to the plane lens (14), and protrusions (113) for limiting and fixing the reflector (13) are provided on the adjacent inner walls of each groove in the U-shaped channel (12).

5. The device for observing the sintering of ceramic materials in a high temperature furnace according to claim 1, characterized in that: The reflective frame (11) is made by sintering hollow alumina sphere material.

6. The device for observing the sintering of ceramic materials in a high temperature furnace according to claim 1, characterized in that: The reflecting mirror (13) is a tungsten mirror with a surface on one side being polished and chemically treated to produce a mirror effect.

7. The device for observing the sintering of ceramic materials in a high temperature furnace according to claim 1, characterized in that: The plane lens (14) and the observation window (4) are both made of transparent quartz glass.

8. The device for observing the sintering of ceramic materials in a high temperature furnace according to claim 1, characterized in that: The channel (2) and the baffle (3) are both made of alumina ceramic material.

9. The device for observing the sintering of ceramic materials in a high temperature furnace according to claim 8, characterized in that: The partition (31) is parallel to the horizontal plane, and the partition (31) and the channel (2) are matched via a notch.

10. The device for observing the sintering of ceramic materials in a high temperature furnace according to claim 9, characterized in that: The reflector (13) on the upper side of the U-shaped channel (12), the observation channel (22) and the observation device (6) are arranged in a straight line in the horizontal direction.

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