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A dual gradient pore structure Sialon bonded silicon carbide membrane tube and its preparation method

A pore structure, silicon carbide membrane technology, applied in the field of porous ceramic materials, can solve the problems of ceramic filter materials being difficult to withstand thermal load fluctuations, poor high temperature mechanical properties, poor thermal shock resistance, etc., achieving easy regeneration and low production costs. , the effect of long service life

Active Publication Date: 2018-11-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because silicon carbide ceramics are extremely difficult to sinter, and the conventional pressureless sintering temperature is 2100°C or even higher, the most widely used silicon carbide filter materials in high-temperature gas filtration are mostly low-temperature oxides such as clay combined with SiC ceramics. The disadvantage is high-temperature mechanical properties Poor, resulting in poor thermal shock resistance, making it difficult for ceramic filter materials to withstand large thermal load fluctuations; especially in environments that are corrosive to low-temperature oxygen oxidation, the service life of materials is greatly reduced, and Sialon ceramics are used as an excellent high-temperature Ceramics have the remarkable characteristics of strong medium corrosion resistance, high service temperature and good fracture toughness. If it is used as the bonding phase of silicon carbide, the overall performance of the material will be greatly improved.

Method used

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  • A dual gradient pore structure Sialon bonded silicon carbide membrane tube and its preparation method
  • A dual gradient pore structure Sialon bonded silicon carbide membrane tube and its preparation method
  • A dual gradient pore structure Sialon bonded silicon carbide membrane tube and its preparation method

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preparation example Construction

[0045] The preparation method of the dual-gradient pore structure Sialon bonded silicon carbide membrane tube of the present invention uses ceramic powder and pore-forming agent as basic materials, uses cold isostatic pressing to press the supporting body after mixing the ingredients, and then uses finer ceramic powder Prepare the raw material of the film layer, prepare the film layer on the surface by spraying method, after drying, sinter to obtain the finished film tube, mainly including the following steps:

[0046] (1) Raw material preparation for support molding

[0047] The raw material coarse silicon carbide, silicon nitride powder, alumina micropowder, aluminum nitride micropowder, yttrium oxide or lanthanum oxide micropowder is (77~60):(10~15):(5~10):( 5~10): (3~5) After blending; add pore-forming agent of 15-20% of the above-mentioned mixed powder mass, and then add 4-6% of the total mass of the above-mentioned mixture. The binder is selected from polyvinyl alcohol ...

Embodiment 1

[0063] Support raw material preparation and molding:

[0064] Mix the raw materials 100 μm silicon carbide particles, 5 μm silicon nitride powder, 3 μm alumina powder, 1 μm aluminum nitride powder, and 0.5 μm yttrium oxide in a mass ratio of 77:10:5:5:3, and then add the above ceramic powder total 15% by mass of PVC powder, powder particle size 10 μm, blended evenly, then add 5% of the total mass of polyvinyl alcohol of the above mixture, and finally add 30% of the total mass of the above raw materials as water as a solvent, mechanically stir and ball mill for 2 hours to obtain a slurry , and then dried and pulverized at 80° C. to obtain raw material composite powder.

[0065] Put the above-mentioned composite powder in the isostatic pressing sheath, adopt mechanical vibration during filling, the isostatic pressing sheath design tube blank size is 1000mm long, 80mm inner diameter, 100mm outer diameter, put it into the cold isostatic pressing machine, add The compression press...

Embodiment 2

[0080] The difference from Example 1 is:

[0081] Mix the raw materials 30 μm silicon carbide particles, 5 μm silicon nitride powder, 3 μm alumina powder, 1 μm aluminum nitride powder, and 0.5 μm yttrium oxide in a mass ratio of 68:14:4:9:5, and then add the above ceramic powder total 20% by mass of PVC powder, powder particle size 10 μm, blended evenly, then add 5% of the total mass of polyvinyl alcohol of the above mixture, and finally add 30% of the total mass of the above raw materials as water as a solvent, mechanically stir and ball mill for 2 hours to obtain a slurry , and then dried and pulverized at 80° C. to obtain raw material composite powder.

[0082] Put the above-mentioned composite powder in the isostatic pressing sheath, adopt mechanical vibration during filling, the isostatic pressing sheath design tube blank size is 1500mm long, inner diameter 40mm, outer diameter 60mm, put into the cold isostatic pressing machine, add The compression pressure is 150MPa, an...

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Abstract

The invention relates to the field of porous ceramic materials, and specifically relates to a dual-gradient pore-structure sialon and silicon carbide combined membrane tube and a preparation method thereof. The membrane tube material is composed of sialon and silicon carbide. The membrane tube has a dual-gradient filtering structure composed of a support body layer and a surface membrane layer. The support body layer is composed of a combination of sialon produced through a reaction and coarse silicon carbide grains, and has an average pore size of 10-50mum. The surface membrane layer is composed of a combination of sialon produced through a reaction and fine-particle silicon carbide grains, and has an average pore size of 0.1-5mum. An overall porosity of the membrane tube is within a range of 40-50%. The preparation method of the membrane tube sequentially comprises the steps of material preparation, support forming, membrane layer preparation and firing. Isostatic pressing is adopted in the forming step, wherein a forming pressure is controlled at 100-150MPa. The firing temperature is controlled at 1650-1850 DEG C, and a temperature maintaining time is 3-5h. The method is easy to realize. With the method, product performance can be ensured. The membrane tube provided by the invention has the advantages of high application temperature, high acid corrosion resistance and high alkali corrosion resistance. The membrane tube can be used in filtration purification of various fluids with high temperature or low temperature, such as high-temperature high-press gas filtration dedusting, water purification and the like.

Description

technical field [0001] The invention belongs to the field of porous ceramic materials, in particular to a dual-gradient pore structure Sialon-bonded silicon carbide membrane tube and a preparation method thereof. Background technique [0002] High-temperature ceramic filter materials generally work under various harsh environmental conditions. As a high-temperature ceramic filter material for gas purification, it is usually required to have: (1) High mechanical strength, high temperature resistance (300-900°C) and excellent medium corrosion resistance Performance; (2) High filtration accuracy, filtration gas velocity and low pressure drop; (3) Easy to blow back, stable operation, high filtration efficiency; (4) Good thermal stability, able to withstand frequent high-pressure pulse cooling Thermal shock caused by blowback of gas. At the same time, according to the requirements of its application, the high-temperature ceramic filter must be able to withstand the influence of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02B01D69/04C04B35/565C04B35/599C04B35/622C04B38/06
Inventor 张劲松田冲杨振明曹小明刘强
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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