Preparation method for silicon carbide ceramic pipe

A technology of silicon carbide ceramics and silicon carbide powder, which is applied in the field of preparation of heat exchange tubes for the nuclear industry, can solve the problems that silicon carbide ceramic tubes do not have ultra-thin wall characteristics, large straightness tolerance, poor corrosion resistance, etc., and achieve anti-corrosion Good radiation and penetration resistance, small deformation and good shape retention

Inactive Publication Date: 2012-06-27
NINGBO VULCAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of free silicon in the silicon carbide ceramic tube sintered by reaction infiltration, its resistance to strong acid media such as hydrofluoric acid or alkali is poor, and it cannot be used in the working environment of the nuclear industry.
[0005] In addition, the Chinese patent CN101581552A adopts an extrusion molding process to prepare a silicon carbide heat exchange tube. Although th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] A method for preparing a silicon carbide ceramic tube includes the following steps:

[0030] (1), 97wt% silicon carbide powder, 0.6wt% boron carbide and 2.4wt% nano carbon black are the main raw materials, and the total mass of the main raw material is added in the above-mentioned main raw material as a percentage of 5 wt% The added amount of glucose is 1wt% of the total mass of the main raw material, the added amount of tetramethylammonium hydroxide is 0.5wt% of the total mass of the main raw material, and the added amount of tetramethylammonium hydroxide is the main raw material. The total mass percentage is 10wt% emulsified liquid paraffin, and finally 25wt% of the main raw material weight is added to deionized water for ball milling to prepare a plastic mud with a solid content of 70% by weight. The plastic mud is water-based silicon carbide plastic Mud. The plastic clay with a solid content of 70% by weight means that the solid phase content in the ...

Example Embodiment

[0037] Example 2

[0038] (1) Take 95wt% silicon carbide powder, 1wt% boron carbide and 4wt% petroleum coke as the main raw materials, and add 6wt% dextrin to the above-mentioned main raw materials. 、Polyethylene glycol with a percentage of the total mass of the main raw material added at 5wt%, and ammonia with a percentage of the total mass of the main raw material added at 1.5wt%, the concentration of the ammonia water is 50vol%, the added amount The percentage of the total mass of the main raw material is 15wt% water-soluble liquid paraffin. Finally, 5wt% of the main raw material weight is added to deionized water for ball milling to prepare a plastic clay with a solid content of 85wt%. The plastic clay is Water-based silicon carbide plastic mud.

[0039] (2) Put the plastic mud material in (1) into the vacuum mud machine for repeated mud practice 7 times to obtain vacuum mud mud material.

[0040] (3) Put the vacuum mud sludge into the extruder, and the density of the extruded ...

Example Embodiment

[0045] Example 3

[0046] (1) Take 95wt% silicon carbide powder, 1wt% boron carbide and 4wt% petroleum coke as the main raw materials, and add 10wt% dextrin to the above-mentioned main raw materials. The added amount of polyethylene glycol is 2wt% of the total mass of the main raw material, and the added amount of tetramethylammonium hydroxide is 1wt% of the total mass of the main raw material. The mass percentage is 12wt% emulsified liquid paraffin, and finally 25wt% of the main raw material weight is added to deionized water for ball milling to prepare a plastic clay with a solid content of 85wt%. The plastic clay is a water-based silicon carbide plastic clay. material.

[0047] (2) Put the plastic mud material in (1) into the vacuum mud machine for repeated mud practice 7 times to obtain vacuum mud mud material.

[0048] (3) Put the above-mentioned vacuum mud sludge into the extruder, and the density of the extruded body is 1.90~1.95g·cm under the pressure of 6MPa. -3 The inner ...

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Abstract

A preparation method for a silicon carbide ceramic pipe includes preparation of plasticity pug, vacuum pug milling of the plasticity pug, extrusion molding and shape keeping of pipe blank bodies, shade drying and drying of the pipe blank bodies and pressureless sintering. The plasticity pug is formed by adding deionized water into silicon carbide powder, sintering auxiliaries, adhesive, plasticizer, dispersing agent and lubricant and ball-milling and mixing the deionized water, the silicon carbide powder, the sintering auxiliaries, the adhesive, the plasticizer, the dispersing agent and the lubricant. The silicon carbide ceramic pipe prepared in the preparation method has the advantages of being highly-compact, super-thin in walls and high in precision and is applicable to industrial heat exchangers.

Description

Technical field: [0001] The invention relates to a method for preparing a heat exchange tube used in the nuclear industry, in particular to a method for preparing a silicon carbide ceramic tube. Background technique: [0002] If the heat exchange tube of the heat exchanger in the nuclear industry leaks radioactive substances during the working process, it will cause radioactive hazards to the surrounding workers, residents and the environment. Silicon carbide ceramics have excellent high temperature resistance, corrosion resistance and radiation resistance, and can work in oxidation, corrosive atmospheres and radiation environments at high temperatures for a long time, so they are often used to make heat exchangers for nuclear industry heat exchangers. Tube. [0003] At present, although the US patent US5227105 uses boron carbide and carbon as sintering aids to prepare silicon carbide heat exchange tubes through a series of continuous production processes such as extrusion,...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B35/622
Inventor 邬国平
Owner NINGBO VULCAN TECH CO LTD
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