Graphite kiln furniture for sintering arc-shaped carbide composite material with large length-diameter ratio

Abstract

The utility model discloses a graphite kiln furniture for sintering arc carbide composite material with large length-diameter ratio, which belongs to the field of powder metallurgy and comprises a plurality of material boxes which are vertically stacked, each material box is provided with a ventilation structure used for communicating and exhausting air among the material boxes and exhausting air outwards, and the material boxes are arranged in the vertical direction. The inner surface of each material box bottom plate is a cambered surface; the sealing piece is arranged at the top of the uppermost layer of material box; the cushion piece is arranged at the bottom of the material box on the lowermost layer; the utility model has the beneficial effects that a plurality of products can be sintered at one time by arranging the stacked material boxes, the bottom surfaces of the material boxes are cambered surfaces, so that the automatic forming of arc carbides in the sintering process is facilitated, the material boxes are convenient to disassemble and assemble, the quantity is adjusted as required, and the use is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of powder metallurgy, and particularly relates to a graphite kiln tool for sintering a large aspect ratio arc-shaped carbide composite material. Background Art

[0002] Carbide composite materials have been widely used in the fields of aerospace and high-speed trains, such as rocket engine nozzles and their throat linings, aircraft brake discs, pantograph slide plates of high-speed trains, etc. With the continuous expansion of the application environment, the working conditions require carbide composite products with a large aspect ratio and an arc shape. The powder sintering method is a commonly used method for carbide composite products. During the sintering process, graphite kiln tools are often widely used as sintering containers and support devices due to their high temperature resistance and strong stability. However, the currently common graphite kiln tools are either single-layer structures or flat-bottom stacking structures of multi-layer graphite kiln tools, with fixed connections between layers, which are inconvenient for disassembly and assembly and do not facilitate the flexible change of the number of graphite kiln tool layers according to the product quantity requirements in actual production. This often leads to problems such as low space utilization rate of graphite kiln tools, small furnace loading capacity, low equipment utilization rate, and high energy consumption. On the other hand, the near-net shaping of large aspect ratio arc-shaped carbide composite materials has always been a major technical difficulty. Carbide composite materials have high hardness, are difficult to process later, and the processing process will also have an adverse impact on product quality. If automatic shaping can be achieved during the sintering process, the product production cycle will be greatly shortened and the preparation cost will be reduced.

[0003] Therefore, we propose a graphite kiln tool for sintering a large aspect ratio arc-shaped carbide composite material. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the utility model provides a graphite kiln tool for sintering a large aspect ratio arc-shaped carbide composite material.

[0005] To achieve the above invention purpose, the technical solution adopted by the utility model is as follows:

[0006] A graphite kiln tool for sintering a large aspect ratio arc-shaped carbide composite material, comprising: a plurality of material boxes, which are vertically stacked; each material box is provided with a ventilation structure for communicating and exhausting gas between each layer of material boxes, and the ventilation structure is also used for exhausting gas from the material box to the outside; the inner surface of the bottom plate of each material box is an arc surface; a sealing member, which is arranged on the top of the uppermost material box; a cushioning member, which is arranged on the bottom of the lowermost material box.

[0007] By setting up several material boxes and stacking the material boxes, multiple products can be sintered at one time, and multiple material boxes are stacked, which is very convenient for assembly and disassembly. The number of installed material boxes can be selected according to the output. A ventilation structure is opened on the material box to exhaust gas during the resin curing, cracking and carbonization process, so that the product reaction sintering is completed in one step in the furnace. The inner surface of the bottom plate of the material box is set to an arc surface, which is conducive to the automatic near-net forming of the sintered product. A sealing piece is set to seal the uppermost material box, which is conducive to preventing the heat radiation of the heating element of the kiln from directly irradiating the sintered material body to form local temperature concentration or uneven temperature field distribution. A cushion is set so that there is a certain space between the bottommost material box and the furnace table, which is conducive to the gas circulation inside the kiln and the overall lifting and displacement of the stacked material boxes.

[0008] It is further defined that the material box is a rectangular box body with an opening at the top, and the ventilation structure includes an exhaust groove and an exhaust hole. The exhaust groove is adjacent to the side wall of the material box and vertically penetrates the bottom plate of the material box, and the exhaust hole horizontally penetrates the long side plate of the material box; the exhaust groove is used for ventilation and exhaust between material boxes, and the exhaust hole is used for exhaust of a single material box. Such arrangement of the exhaust channel can make the exhaust effect better, and the opening of the exhaust hole can also be used to pass a cross bar through the exhaust hole, and then hang lifting ropes at both ends of the cross bar to lift and shift all material boxes on the upper layer of the exhaust hole.

[0009] It is further defined that the inner surface of the bottom plate of the material box is an upwardly convex curved surface, and the extending direction of the arc line of the inner surface of the bottom plate of the material box is the length direction of the material box.

[0010] It is further defined that the inner surface of the bottom plate of the material box is a downwardly concave arc surface, and the extending direction of the arc line of the inner surface of the bottom plate of the material box is the length direction of the material box.

[0011] It is further defined that the cushion member is a rectangular block, two of which are symmetrically arranged at the bottom of the lowest material box, and the cushion members are staggered with the exhaust grooves, and the length of the cushion members matches the width of the material box; the cushion member is arranged as a rectangular block, which has a simple structure, is easy to manufacture and is very convenient to use.

[0012] It is further defined that the closing member is a cover plate, and a plurality of ventilation holes are vertically opened on the left and right sides of the cover plate; the ventilation holes opened on the cover plate are conducive to cooperating with the ventilation structure to timely discharge the waste gas generated during the curing and carbonization of the resin.

[0013] The beneficial effects of the utility model are as follows: by arranging stacked material boxes, multiple products can be sintered at one time, and the bottom surface of the material box is arranged as an arc surface, which is more conducive to the automatic forming of arc-shaped carbides during the sintering process. The material boxes are easy to disassemble and assemble, and the quantity can be adjusted according to needs, which is more convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a three-dimensional schematic diagram of the utility model;

[0015] Figure 2 It is a longitudinal cross-sectional schematic diagram of Example 1;

[0016] Figure 3 is a schematic cross-sectional view of the material box in Example 1;

[0017] Figure 4 It is a schematic longitudinal section diagram of the material box in Example 2.

[0018] The symbols of the components are as follows:

[0019] The material box 1 , the closing member 2 , the vent hole 21 , the cushion member 3 , the vent structure 4 , the exhaust groove 41 , and the exhaust hole 42 . DETAILED DESCRIPTION

[0020] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0021] Embodiment 1:

[0022] like Figures 1 - 3 As shown, a graphite kiln tool for sintering arc-shaped carbide composite materials with a large aspect ratio comprises a material box 1, a closing member 2, a cushion member 3 and a ventilation structure 4; the material box 1 is a rectangular box body with an opening at the top, and the material box 1 is provided with a plurality of material boxes 1, which are vertically stacked, and each material box 1 is provided with a ventilation structure 4 for communicating and exhausting between each layer of material boxes 1, and the ventilation structure 4 is also used for exhausting the material boxes 1 outwards, and the inner surface of the bottom plate of each material box 1 is an arc surface; the inner surface of the bottom plate of the material box 1 is an upwardly convex arc surface, and the arc line of the inner surface of the bottom plate of the material box 1 extends in the length direction of the material box 1; the ventilation structure 4 is used for the ventilation of the material box 1. The structure 4 includes an exhaust groove 41 and an exhaust hole 42, the exhaust groove 41 is adjacent to the wide side wall of the material box 1 and vertically penetrates the bottom plate of the material box 1, and the exhaust hole 42 horizontally penetrates the long side plate of the material box 1; the closing member 2 is arranged on the top of the uppermost material box 1; the closing member 2 is a cover plate, and a plurality of ventilation holes 21 are vertically opened on the left and right sides of the cover plate; the cushion member 3 is arranged at the bottom of the lowermost material box 1; the cushion member 3 is a rectangular cushion block, two cushion blocks are provided, symmetrically arranged at the bottom of the lowermost material box 1, and the cushion blocks are staggered from the exhaust groove 41, and the length of the cushion block matches the width of the material box 1.

[0023] By setting a plurality of material boxes 1 and stacking the material box layers 1, multiple products can be sintered at one time in this way. Moreover, with multiple material boxes 1 stacked, the disassembly and assembly are very convenient, and the number of installed material boxes 1 can be selected according to the output. An air vent structure 4 is provided on the material box 1, which can exhaust gas during the resin curing and pyrolysis carbonization processes, enabling the reaction sintering of the product to be completed in one step in the furnace. The inner surface of the bottom plate of the material box 1 is set as an arc surface, which is conducive to the automatic near-net shaping of the sintered product. A sealing member 2 is provided to seal the uppermost material box 1, which is beneficial to preventing the thermal radiation of the furnace heating element from directly irradiating the sintered material blank, resulting in local temperature concentration or uneven temperature field distribution. A cushion member 3 is provided to have a certain space between the lowermost material box 1 and the furnace platform, which is beneficial to the gas circulation inside the furnace and also beneficial to the overall lifting and shifting of the stacked material boxes; the exhaust ventilation groove 41 is used for ventilation and exhaust between the material box 1 and the material box 1, and the exhaust hole 42 is used for the exhaust of a single material box 1. Such a setting of the exhaust channel can make the exhaust effect better, and the opening of the exhaust hole 42 can also be used to pass a cross bar through the exhaust hole 42, and then lifting ropes are hung at both ends of the cross bar to lift and shift all the material boxes 1 above the exhaust hole 42 where it is located; setting the cushion member 3 as a rectangular block structure is simple in structure, convenient to manufacture and very convenient to use.

[0024] Embodiment 2:

[0025] As Figure 1 and Figure 4 shown, the difference between Embodiment 2 and Embodiment 1 lies in that the inner surface of the bottom plate of the material box 1 is a downwardly concave arc surface, and the extending direction of the inner surface arc of the bottom plate of the material box 1 is the length direction of the material box 1.

[0026] The inner surface of the bottom plate of the material box 1 is set as a downwardly concave arc surface to adapt to the sintering and forming of concave products.

[0027] The material box of Embodiment 1 can be used alone in a stacked manner or combined and stacked with the material box of Embodiment 2.

Claims

1. A graphite kiln furniture for sintering large aspect ratio arc-shaped carbide composites, characterized in that, include: A material box (1) is provided with a plurality of material boxes (1) which are arranged in a vertically stacked manner, each material box (1) is provided with a ventilation structure (4) for communicating and exhausting the material boxes (1) at each layer, and the ventilation structure (4) is also used for exhausting the material boxes (1) outwards, and the inner surface of the bottom plate of each material box (1) is a curved surface; A sealing member (2) is arranged on the top of the uppermost material box (1); A cushion (3) is arranged at the bottom of the material box (1) at the lowest layer.

2. The graphite kiln furniture for sintering the carbide composite material with a large aspect ratio according to claim 1, characterized in that, The material box (1) is a rectangular box body with an opening at the top, and the ventilation structure (4) comprises an exhaust groove (41) and an exhaust hole (42), wherein the exhaust groove (41) is adjacent to the side wall of the material box (1) and vertically penetrates the bottom plate of the material box (1), and the exhaust hole (42) horizontally penetrates the long side plate of the material box (1).

3. The graphite kiln furniture for sintering the large aspect ratio arc-shaped carbide composite material according to claim 2, wherein The inner surface of the bottom plate of the material box (1) is an upwardly convex curved surface, and the direction in which the arc of the inner surface of the bottom plate of the material box (1) extends is the length direction of the material box (1).

4. The graphite kiln furniture for sintering the large aspect ratio arc-shaped carbide composite material according to claim 2, wherein, The inner surface of the bottom plate of the material box (1) is a downwardly concave arc surface, and the direction in which the arc line of the inner surface of the bottom plate of the material box (1) extends is the length direction of the material box (1).

5. The graphite kiln furniture for sintering the large aspect ratio arc-shaped carbide composite material according to claim 2, wherein The cushion member (3) is a rectangular cushion block, two of which are symmetrically arranged at the bottom of the lowest material box (1), and the cushion blocks are staggered with respect to the exhaust slots (41), and the length of the cushion blocks matches the width of the material box (1).

6. The graphite kiln furniture for sintering the large aspect ratio arc carbide composite material according to claim 1, wherein The closing member (2) is a cover plate, and a plurality of ventilation holes (21) are vertically opened on the left and right sides of the cover plate.

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