High-temperature stability testing furnace for silicon carbide composite material

Abstract

The utility model discloses a silicon carbide composite material high-temperature stability test furnace which is internally provided with a heat insulation tile layer for controlling the temperature, so that each part in the furnace is uniformly heated and cooled as much as possible, and meanwhile, the interference and influence of sudden rise and sudden drop of the temperature in the furnace on a sample are avoided; the to-be-tested silicon carbide composite material is clamped through the rotatable clamping mechanism, specifically, the tip end of the sample clamping rod abuts against the to-be-tested silicon carbide composite material, point contact is achieved, and the influence of uneven heating caused by the clamping effect is reduced to the minimum.

Description

Technical Field

[0001] The utility model relates to the field of high-temperature stability testing of special materials, in particular to a test of high-temperature dimensional stability of a composite material containing silicon carbide fibers prepared in a laboratory. Background Art

[0002] High temperature stability test generally refers to the determination of the high temperature stability of the test sample by measuring the size, strength and conductivity of the sample after the sample is exposed to a high temperature environment for a period of time.

[0003] At present, when conducting high-temperature stability tests on composite materials containing silicon carbide fibers prepared in the laboratory, the sample to be tested is placed on an insulating brick, placed in a muffle furnace for heating, and the sample is taken out for testing after completion. However, during the high-temperature test, it was found that the expansion effect of the contact surface between the sample and the insulating brick is often different from that of the other surfaces. After research, it was found that the temperature in the furnace was transmitted to the sample to be tested through the insulating brick, resulting in the temperature of the contact surface between the sample and the insulating brick being different from that of the other surfaces, which in turn caused the expansion effect of the sample to be uneven, affecting the experimental results and making it difficult to accurately know its high-temperature stability.

[0004] Based on the above problems, the inventors have conducted in-depth research on laboratory-scale high-temperature stability testing equipment for silicon carbide composite materials, fully considering practical needs such as uniform heating and synchronous temperature rise, in the hope of designing a new test furnace that can solve the above problems. Utility Model Content

[0005] In order to overcome the above-mentioned problems, the inventors have conducted intensive research and designed a high-temperature stability test furnace for silicon carbide composite materials. The test furnace is provided with a heat-insulating tile layer for temperature control, so that the temperature in each part of the furnace can be raised and lowered as evenly as possible, while avoiding the interference and influence of the sudden rise and fall of the temperature in the furnace on the sample; the silicon carbide composite material to be tested is clamped by a rotatable clamping mechanism, specifically, the tip of the sample clamping rod abuts against the silicon carbide composite material to be tested to achieve point contact, thereby minimizing the influence of uneven heating caused by the clamping action, thereby completing the utility model.

[0006] Specifically, the purpose of the utility model is to provide a high temperature stability test furnace for silicon carbide composite materials, the test furnace comprising a furnace body 1, a furnace door 2 is opened on the side of the furnace body 1;

[0007] The wall surface of the furnace body 1 includes a heating layer 3 located on the outside and a temperature control layer 4 located on the inside; the temperature inside the furnace body 1 changes slowly and evenly through the temperature control layer 4;

[0008] A rotating fork 5 is also provided in the furnace body 1, and a clamping mechanism is provided on the rotating fork 5, through which the silicon carbide composite material to be tested is clamped and fixed;

[0009] The rotary fork 5 continuously rotates, driving the silicon carbide composite material to be tested to rotate in the furnace body 1, so that the silicon carbide composite material to be tested is uniformly heated in the furnace body 1;

[0010] There is a point contact between the clamping mechanism and the silicon carbide composite material to be tested.

[0011] Wherein, an electric heating wire 31 is arranged in the heating layer 3, and the electric heating wire 31 provides heat source for the furnace body 1.

[0012] Wherein, the temperature control layer 4 is a heat insulation tile layer, and the thickness of the temperature control layer 4 is 4 - 5 cm.

[0013] Wherein, the clamping mechanism includes a screw sleeve 61, a screw 62, a support platform 63 and a sample clamping rod 64;

[0014] Wherein, an internal thread is arranged inside the screw sleeve 61, an external thread is arranged outside the screw 62, the support platform 63 is fixedly installed at the end of the screw 62, and the extending length of the support platform 63 relative to the screw sleeve 61 is adjusted by screwing the screw 62;

[0015] The sample clamping rod 64 is installed on the support platform 63, and the sample clamping rod 64 moves synchronously with the support platform 63;

[0016] The tip of the sample clamping rod 64 abuts against the silicon carbide composite material to be tested to achieve point contact.

[0017] Wherein, the clamping mechanism further includes a connecting rib, the connecting rib is in a U - shaped font, that is, the connecting rib includes a connecting rod 71 located in the middle, and mounting rods 72 are respectively arranged at both ends of the connecting rod 71;

[0018] A screw sleeve 61, a screw 62, a support platform 63 and a sample clamping rod 64 are installed on each mounting rod 72;

[0019] The silicon carbide composite material to be tested is located between two support platforms 63 and is tightly fixed by the sample clamping rods 64 on both sides.

[0020] Wherein, the connecting rib has elasticity, and when the silicon carbide composite material to be tested deforms during the test, it automatically adjusts the distance between the two mounting rods 72 to prevent the sample clamping rod 64 from scratching the silicon carbide composite material to be tested.

[0021] Wherein, during the test, the rotation speed of the rotary fork 5 is 5 - 10 revolutions per minute.

[0022] Wherein, a rotation speed knob 81 and a rotation speed display screen 82 which are signal - connected to the rotary fork 5 are arranged on the furnace door 2;

[0023] The oven door 2 is provided with a temperature control knob 91 and a temperature display screen 92 which are connected to the signal of the heating wire 31 .

[0024] Wherein, a temperature sensor 10 is arranged inside the furnace body 1 .

[0025] The beneficial effects of the utility model include:

[0026] (1) According to the high temperature stability test furnace of silicon carbide composite materials provided by the utility model, the test furnace places the sample to be tested in the middle of the sample clamp rod by adjusting the displacement of the screws on both sides of the rotating fork on the screw sleeve, and then completely fixes the sample on the rotating fork by adjusting the screws on both sides of the rotating fork. When performing the high temperature stability test, since the rotating fork is always rotating at a certain speed, all parts of the sample on the rotating fork are evenly heated, thereby ensuring the uniformity of sample expansion to the greatest extent;

[0027] (2) According to the high temperature stability test furnace of the silicon carbide composite material provided by the utility model, after high temperature calcination, the heat dissipation of the inner shell of the furnace body is slow and the rotating fork will continue to rotate, thereby ensuring the accuracy of the high temperature stability test result;

[0028] (3) According to the high-temperature stability test furnace for silicon carbide composite materials provided by the utility model, the connecting ribs for installing the clamping devices such as the screw sleeve and the sample clamp rod have a certain elasticity, and can automatically adjust the distance between the two mounting rods when the silicon carbide composite material to be tested is deformed, which can not only ensure that the silicon carbide composite material to be tested is clamped, but also prevent the sample clamp rod from scratching the silicon carbide composite material to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 The overall structure schematic diagram of the high temperature stability test furnace for silicon carbide composite materials provided by the utility model is shown;

[0030] Figure 2 A cross-sectional view of a high-temperature stability test furnace for silicon carbide composite materials provided by the utility model, i.e., a schematic diagram of the structure inside the furnace, is shown;

[0031] Figure 3 The schematic diagram of the structure of the rotating fork and the clamping mechanism of the high temperature stability testing furnace of silicon carbide composite materials provided by the utility model is shown.

[0032] Description of Figure Numbers:

[0033] 1-Furnace body

[0034] 2-Furnace door

[0035] 3- Heating layer

[0036] 31-Heating wire

[0037] 4- Temperature control layer

[0038] 5- Turn fork

[0039] 61-Screw sleeve

[0040] 62-Screw

[0041] 63-Support table

[0042] 64-Sample clamp rod

[0043] 71-Connecting rod

[0044] 72-Mounting rod

[0045] 81-Speed ​​knob

[0046] 82-Speed ​​display

[0047] 91-Temperature control knob

[0048] 92-Temperature display

[0049] 10- Temperature sensor DETAILED DESCRIPTION

[0050] The utility model is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the utility model will become clearer and more specific.

[0051] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0052] According to the utility model, a high temperature stability test furnace for silicon carbide composite materials is provided. Figure 1 , Figure 2 and Figure 3 As shown in , the test furnace comprises a furnace body 1 , and a furnace door 2 is opened on the side of the furnace body 1 ; when the furnace door 2 is closed, a closed heating chamber is formed in the furnace body 1 .

[0053] The wall surface of the furnace body 1 includes a heating layer 3 located on the outside and a temperature control layer 4 located on the inside; the temperature inside the furnace body 1 changes slowly and evenly through the temperature control layer 4;

[0054] Preferably, a heat insulating layer is provided on the outside of the heating layer 3 to prevent the user from being scalded; the heating layer is provided on the four sides of the furnace body 1. The temperature control layer 4 is provided on all six sides of the furnace body 1.

[0055] Preferably, a heating wire 31 is provided in the heating layer 3 to provide a heat source for the furnace body 1. 2-4 heating wires 31 are provided in the heating layer on each wall, and the plurality of heating wires 31 are evenly distributed to avoid excessive local temperature.

[0056] Preferably, three heating wires are arranged on the heating layer of each wall, and the power of each heating wire is 1000W. The applicant has found that by setting the above number and power of heating wires, the requirements of the furnace body 1 for the maximum temperature and the heating speed can be met. Preferably, the maximum temperature inside the furnace body 1 in the present application can reach 1200°C.

[0057] Preferably, the temperature control layer 4 is a heat-insulating tile layer, and the thickness of the temperature control layer 4 is 4-5 cm. The applicant has found that when the thickness of the heat-insulating tile layer is 4-5 cm, with the cooperation of the above-mentioned electric heating wire, the heating rate in the furnace body can be controlled at 1°C to 5°C / min, and the cooling rate during cooling is 1°C to 5°C / min.

[0058] A rotating fork 5 is also provided in the furnace body 1, and a clamping mechanism is provided on the rotating fork 5, through which the silicon carbide composite material to be tested is clamped and fixed;

[0059] The rotating fork 5 in the present application is connected to the motor outside the furnace body 1, and the rotating fork is continuously rotated by the motor control. During operation, when the temperature starts to rise, the rotating fork starts to rotate until the temperature in the furnace body 1 cools down to room temperature.

[0060] Preferably, during the test, the rotation speed of the rotating fork 5 is 5-10 revolutions per minute. The applicant has found that when the rotating fork is controlled within this rotation speed range, it can ensure that the clamping mechanism clamps the silicon carbide composite material to be tested and does not fall off, and it can also ensure that the silicon carbide composite material to be tested is heated evenly without uneven heating.

[0061] The rotating fork 5 rotates continuously, and drives the silicon carbide composite material to be tested to rotate in the furnace body 1 through the rotating fork, so that the silicon carbide composite material to be tested is evenly heated in the furnace body 1;

[0062] Preferably, if Figure 3 As shown in , the clamping mechanism includes a screw sleeve 61, a screw 62, a support platform 63 and a sample clamping rod 64;

[0063] Among them, an internal thread is provided inside the screw sleeve 61, and an external thread is provided on the outside of the screw 62. The support platform 63 is fixedly installed on the end of the screw 62, and the extension length of the support platform 63 relative to the screw sleeve 61 is adjusted by screwing the screw 62; the rotation direction of the screw 62 is consistent with the rotation direction of the fork, ensuring that the rotation of the fork will not cause the screw 62 to rotate and fall off.

[0064] The sample clamp rod 64 is installed on the support platform 63, and the sample clamp rod 64 moves synchronously with the support platform 63;

[0065] The clamping mechanism is in point contact with the silicon carbide composite material to be tested.

[0066] Specifically, the tip of the sample clamp rod 64 abuts against the silicon carbide composite material to be tested to achieve point contact. Preferably, two sample clamp rods 64 are provided on each support platform 63 .

[0067] Preferably, the clamping mechanism further comprises a connecting rib, and the connecting rib is in a U-shape, that is, the connecting rib comprises a connecting rod 71 located in the middle, and mounting rods 72 are respectively arranged at both ends of the connecting rod 71;

[0068] A screw sleeve 61, a screw 62, a support platform 63 and a sample clamping rod 64 are installed on each mounting rod 72;

[0069] The silicon carbide composite material to be tested is located between two support platforms 63 and is tightened and fixed by sample clamping rods 64 on both sides.

[0070] In the present application, the silicon carbide composite material to be tested is generally made into a rectangular block and then placed in the furnace body 1. After the high temperature test, the rectangular block generally expands to a certain extent, and its expansion rate is one of the properties to be tested. When the rectangular block expands, it may cause the contact part between the sample clamp rod 64 and the rectangular block to be subjected to excessive force, thereby damaging the rectangular block or the sample clamp rod 64.

[0071] In order to solve this problem, the connecting rib is elastic and automatically adjusts the distance between the two mounting rods 72 when the silicon carbide composite material to be tested is deformed during the test, so as to prevent the sample clamping rod 64 from scratching the silicon carbide composite material to be tested.

[0072] Preferably, a speed knob 81 and a speed display screen 82 connected to the signal of the swivel fork 5 are provided on the furnace door 2; the swivel fork start, shut down and speed adjustment are controlled by the speed knob 81, and the speed display screen 82 displays the speed of the swivel fork in real time.

[0073] A temperature control knob 91 and a temperature display screen 92 connected to the signal of the heating wire 31 are provided on the furnace door 2. The power of the heating wire 3 is controlled by the temperature control knob 91, thereby controlling the heat generation. The temperature near the heating wire is displayed by the temperature display screen 92. The temperature display screen 92 can also display the temperature inside the furnace body 1 detected by the temperature sensor 10, so as to facilitate the precise control and study of the heating and cooling rates in the furnace body 1.

[0074] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships in the working state of the present invention. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0075] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. A high temperature stability test furnace for silicon carbide composite materials, characterized in that: The test furnace includes a furnace body (1), and a furnace door (2) is provided on the side of the furnace body (1); The wall surface of the furnace body (1) includes a heating layer (3) located on the outside and a temperature control layer (4) located on the inside; through this temperature control layer (4), the temperature inside the furnace body (1) changes slowly and evenly; A rotary fork (5) is also provided in the furnace body (1), and a clamping mechanism is provided on the rotary fork (5), and the silicon carbide composite material to be tested is clamped and fixed through this clamping mechanism; The rotary fork (5) rotates continuously, and drives the silicon carbide composite material to be tested to rotate in the furnace body (1) through this rotary fork, so that the silicon carbide composite material to be tested is uniformly heated in the furnace body (1); There is a point contact between the clamping mechanism and the silicon carbide composite material to be tested.

2. The high-temperature stability test furnace for silicon carbide composite materials according to claim 1, characterized in that An electric heating wire (31) is provided in the heating layer (3), and the electric heating wire (31) provides heat source for the furnace body (1).

3. The high-temperature stability test furnace for silicon carbide composite materials according to claim 1, characterized in that The temperature control layer (4) is a heat-insulating tile layer, and the thickness of the temperature control layer (4) is 4 - 5 cm.

4. The high-temperature stability test furnace for silicon carbide composite materials according to claim 1, characterized in that The clamping mechanism includes a screw sleeve (61), a screw (62), a support platform (63) and a sample clamping rod (64); Among them, an internal thread is provided inside the screw sleeve (61), an external thread is provided on the outside of the screw (62), and the support platform (63) is fixedly installed at the end of the screw (62), and the protruding length of the support platform (63) relative to the screw sleeve (61) is adjusted by screwing the screw (62); The sample clamping rod (64) is installed on the support platform (63), and the sample clamping rod (64) moves synchronously with the support platform (63); The tip of the sample clamping rod (64) abuts against the silicon carbide composite material to be tested to achieve point contact.

5. The high-temperature stability test furnace for silicon carbide composite materials according to claim 4, characterized in that The clamping mechanism further includes a connecting rib, and the connecting rib is in a 冂 shape, that is, the connecting rib includes a connecting rod (71) located in the middle, and mounting rods (72) are respectively provided at both ends of the connecting rod (71); A screw sleeve (61), a screw (62), a support platform (63) and a sample clamping rod (64) are installed on each mounting rod (72); The silicon carbide composite material to be tested is located between two support platforms (63) and is jointly clamped and fixed by the sample clamping rods (64) on both sides.

6. The high-temperature stability test furnace for silicon carbide composite materials according to claim 5, characterized in that The connecting rib has elasticity, and when the silicon carbide composite material to be tested deforms during the test, it automatically adjusts the distance between the two mounting rods (72) to prevent the sample clamping rod (64) from scratching the silicon carbide composite material to be tested.

7. The high-temperature stability test furnace for silicon carbide composite materials according to claim 1, characterized in that During the test, the rotation speed of the rotating fork (5) is 5-10 revolutions per minute.

8. The high temperature stability testing furnace for silicon carbide composite materials according to claim 1, characterized in that: A speed knob (81) and a speed display screen (82) connected to the rotation fork (5) signal are arranged on the furnace door (2); The furnace door (2) is provided with a temperature control knob (91) and a temperature display screen (92) connected to the signal of the electric heating wire (31).

9. The high temperature stability testing furnace for silicon carbide composite materials according to claim 1, characterized in that: A temperature sensor (10) is arranged inside the furnace body (1).

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