Process for preparing gradient porous ceramic filter element

A technology of ceramic filtration and gradient holes, applied in ceramic products, filtration separation, separation methods, etc., can solve the problems of affecting the filtration efficiency of products, unstable product performance, and affecting bonding strength, etc., to achieve high thermal shock resistance and produce finished products The effect of high rate and high production efficiency

Inactive Publication Date: 2004-09-29
SHANDONG UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the deep penetration of the slurry into the support during grouting and coating, the filtration efficiency of the product is greatly affected
In addition, the support body is usually pre-fired during coating, and it is dried and fired after coating. Due to the different shrinkage rates of the support body and the film, peeling between the film and the support body is easy to occur, which affects the bonding strength, and the labor workload is large and the cost is high. High, low yield, unstable product performance

Method used

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  • Process for preparing gradient porous ceramic filter element
  • Process for preparing gradient porous ceramic filter element
  • Process for preparing gradient porous ceramic filter element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation method of the gradient hole ceramic filter element of the present invention includes ceramic powder treatment, preparation of blanks, molding and firing processes, taking alumina ceramic powders with a particle size of 45 μm, 20 μm, and 3 μm as examples, the preparation method is as follows :

[0024] ①Ceramic powder treatment process:

[0025] Aggregate particles I: 60% alumina (45μm), 40% high temperature binder solution;

[0026] Aggregate particle II: alumina (20μm) 65%, high temperature binder solution: 35%;

[0027] Aggregate particle III: alumina (3μm) 70%, high temperature binder solution: 30%.

[0028] The mass percentage of the high-temperature binder solution is composed of: 10-30% of alumina sol, 30-10% of aluminum phosphate sol, 20-30% of sodium silicate (water glass) solution, and 0.05-1% polyvinyl alcohol The solution is 20-15%, and the concentration is 0.05-1% of the cellulose solution 20-15%.

[0029] In the ceramic powder treatment ...

Embodiment 2

[0039] Taking alumina ceramic powder with a particle size of 45 μm and 3 μm and silicon carbide ceramic powder with a particle size of 20 μm as examples, the preparation method is as follows:

[0040] ①Ceramic powder treatment process:

[0041] Aggregate particle I: alumina (45μm) 60%, high temperature binder solution: 40%;

[0042] Aggregate particles II: silicon carbide (20μm) 67%, high temperature binder solution: 33%;

[0043] Aggregate particle III: alumina (3μm) 70%, high temperature binder solution: 30%.

[0044] The ceramic powder treatment process is the same as in Example 1.

[0045] ② Billet preparation process: The mass composition of the billet is: processed alumina aggregate particles I, III and silicon carbide aggregate particles II are: 80-95%, molding binder 8-1%, pore-enhancing agent 7-3 %, water 5-1%. The composition and preparation of the molding binder and the pore-enhancing agent are the same as in Example 1, and three blanks I, II, and III are obtain...

Embodiment 3

[0051] Taking alumina ceramic powder with a particle size of 5 μm as an example, the preparation process is as follows:

[0052] ①Ceramic powder treatment process: alumina (5μm) 70%, high temperature binder solution: 30%. The ceramic powder treatment process is the same as in Example 1 to obtain the required aggregate particles.

[0053] ②Bill preparation process: The mass percentage of the blank is composed of: 80-95% of aggregate particles, 8-1% of forming binder, 7-3% of pore-enhancing agent, and 5-1% of water. Wherein: the composition and preparation of forming binder, pore-enhancing agent, and water are the same as in Example 1.

[0054] ③Molding process: evenly vibrate the billet and put it into the mold, then take off the abrasive layer, and perform isostatic pressing. Dry at 60-100°C for 3-6 hours.

[0055] ④Sintering process: the dried body is fired at 1300°C for 1-2 hours to obtain the alumina porous ceramic or ceramic filter element of the present invention.

[...

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Abstract

The preparation process of gradient porous ceramic filter element includes ceramic powder processing of mixing ceramic powder of different granularity with high temperature binding agent solution, ball milling and spraying to form ceramic aggregate grains of different granularity coated with one layer of high temperature binding agent; compounding blank material with the aggregate grains, binding agent, pore creating agent and water; forming in mold and drying; and final high temperature sintering. The present invention adopts hydrostatic forming technology to simplify the preparation of gradient porous ceramic filter element, and is especially suitable for industrial production. The product has high strength and high heat shock resistance, and is suitable for making high temperature gas and fume filter.

Description

Technical field [0001] The invention relates to a preparation method of a gradient pore ceramic filter element, which belongs to the technical field of porous ceramic preparation technology. Background technique [0002] The preparation of gradient pore ceramic filter elements includes ceramic powder treatment, preparation of blanks, molding and firing processes. The production is difficult, and methods such as grouting and coating are usually used. Since the slurry penetrates deeply into the support body during grouting and coating, it greatly affects the filtration efficiency of the product. In addition, the support body is usually pre-fired during coating, and it is dried and fired after coating. Due to the different shrinkage rates of the support body and the film, peeling between the film and the support body is easy to occur, which affects the bonding strength, and the labor workload is large and the cost is high. High, low yield, unstable product performance. Conte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20C04B38/00
Inventor 田贵山唐竹兴许珂敬任京成
Owner SHANDONG UNIV OF TECH
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