Block hole-type pressureless sintering silicon carbide heat-exchange module and process thereof

A technology of sintered silicon carbide and heat exchange modules, which is applied in the field of engineering ceramic materials, can solve the problems of O-ring sealing instability, increased production costs, broken tube leakage, etc., to achieve reliable sealing, improve performance, and avoid breakage Effect

Active Publication Date: 2020-06-05
威海华瓷新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sealing method of the O-ring is unstable. Under the conditions of high pressure, high temperature and high corrosion, seal leakage often occurs
Furthermore, when the tube-and-tube design is installed, due to the straightness of the silicon carbide heat exchange tubes, installation stress, and the gap between the heat exchange tubes and the baffles, it is very easy to cause broken tubes and leaks under some working conditions. , the above problems bring great inconvenience to the operators in the actual working process, and the production cost increases

Method used

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  • Block hole-type pressureless sintering silicon carbide heat-exchange module and process thereof
  • Block hole-type pressureless sintering silicon carbide heat-exchange module and process thereof
  • Block hole-type pressureless sintering silicon carbide heat-exchange module and process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, it is a block-hole type pressureless sintered silicon carbide heat exchange module, which includes a sintering unit, and the sintering unit is a lower plate 1, a horizontal grid 2, a middle plate 3, and a vertical grid 4 from bottom to top. , Upper board 5. The horizontal grid bars 2 and the vertical grid bars 4 are all provided with several and arranged at a certain distance, and the borders of the horizontal grid bars 2 and the vertical grid bars 4 are all provided with side bars 6 . In this embodiment, the width of the side bars 6 is greater than the widths of the horizontal grid bars 2 and the vertical grid bars 4 .

[0019] Adhesives are arranged on the upper and lower surfaces of the above-mentioned horizontal lattice strips 2, vertical lattice strips 4, and side strips 6 to facilitate bonding and sintering. Such as figure 2 As shown, a plurality of sintered units are combined to form a block-hole pressureless sintered silicon carbid...

Embodiment 2

[0021] The preparation process for the block hole type pressureless sintered silicon carbide heat exchange module in Example 1 includes the following steps: (1) Manufacturing the pressureless sintered silicon carbide green body, the lower plate, the horizontal grid, the middle plate, the vertical grid The blanks of strips and upper plates are manufactured separately;

[0022] (2) Manually coat the bonding material on the upper and lower sides of the horizontal grid, side strips, and vertical grids, with a coating thickness of 0.3-0.6 mm, and apply the , the upper plate and the side strips are assembled;

[0023] (3) Place the assembled block-hole silicon carbide green body into a vacuum furnace for sintering, the sintering atmosphere is argon, the sintering temperature is 2000-2200°C, and the holding time is 0.5-3h;

[0024] (4) After the sintering is completed, continue to place it in a vacuum furnace for annealing treatment. The annealing atmosphere is nitrogen, the tempera...

Embodiment 3

[0027] It is a small-hole heat exchanger of 1 square meter, and the cross-sectional area of ​​the hole channel is 4*28.7=118mm 2

[0028]

[0029] The above is a statistical table of the sintered size and the sintered size data of an embodiment according to the process of embodiment 2.

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Abstract

The invention belongs to the technical field of engineering ceramic materials, and particularly relates to a block hole-type pressureless sintering silicon carbide heat-exchange module and a process thereof. The module comprises at least one sintering unit, each sintering unit sequentially comprises a lower plate, a plurality of transverse lattice bars, a middle plate, a plurality of vertical lattice bars and an upper plate from bottom to top, the transverse lattice bars and the vertical lattice bars are arranged at certain intervals, and edgings are arranged on the boundaries of the transverse lattice bars and the vertical lattice bars. The lower plate, the transverse lattice bars, the middle plate, the vertical lattice bars and the upper plate are bonded together to be sintered, the problem that a gap exists between a traditional heat exchange pipe and a baffle plate is effectively solved, and the heat exchange pipe is prevented from being broken due to resonance; different from O-shaped ring sealing adopted by a tube type heat exchanger, end face sealing is adopted by a block hole type heat exchanger; and the use safety and stability of the silicon carbide heat exchanger are greatly improved. The silicon carbide heat-exchange module has the advantages of being high in strength, resistant to impact, reliable in sealing, not prone to breakage and the like, and the use performance is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of engineering ceramic materials, and in particular relates to a block hole type pressureless sintered silicon carbide heat exchange module and a process. Background technique [0002] Silicon carbide is a single-phase, pressureless sintered silicon carbide ceramic with excellent properties such as high purity, fine grain and extremely low porosity. Excellent alternative. Silicon carbide is widely used in extreme environments of high temperature, high pressure, strong corrosion, and high wear in chemical, pharmaceutical, and metallurgical industries, especially silicon carbide heat exchangers. [0003] At present, the pressureless sintered silicon carbide heat exchanger generally adopts the shell and tube design. However, silicon carbide parts cannot be welded effectively, so O-rings and tube-sheet seals are generally used. However, the sealing method of the O-ring is unstable, and under high pressure, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565F28F21/02
CPCC04B35/565C04B35/571F28F21/02C04B2235/428C04B2235/3821C04B2235/6586C04B2235/668C04B2235/612C04B2235/95
Inventor 李清华张仁升
Owner 威海华瓷新材料有限责任公司
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