Continuous fiber-reinforced high-temperature ceramic fiber filter element and preparation method thereof

A high-temperature ceramic and fiber filtration technology, applied in the field of inorganic non-metallic materials and ceramic filter materials, can solve the problems of low filter element toughness and wear resistance, difficult product performance control, complicated preparation process, etc., to improve strength and rigidity. , Conducive to demoulding, increase the effect of pore structure

Active Publication Date: 2018-12-07
SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] Suzhou Boqing High-tech Materials Co., Ltd. disclosed a composite ceramic filter element and its preparation process on March 25, 2015, (ZL 201410651866.9), which uses continuous ceramic fibers to be wound on a mold to form a preform, and then through short fibers Slurry impregnation prefabricated body preparation, so that the surface of the continuous fiber is coated with a layer of short fibers, and then a layer of SiC coating is formed on the short fiber layer to make a filter element. The preparation process is complicated and costly, and the short fibers are only impregnated The process is applied on the surface of the continuous fiber matrix as a filter layer, which is easy to fall off, the toughness and abrasion resistance of the filter element are relatively low, and the product performance is not easy to control

Method used

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  • Continuous fiber-reinforced high-temperature ceramic fiber filter element and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 As shown, a preparation process of a continuous fiber-reinforced high-temperature ceramic fiber filter element is to add 2000 g of mechanically chopped aluminum silicate fibers below 5 mm into a mixer with 28 L of water, and stir at a high speed of 600 rpm for 2 hours. Obtain a uniformly dispersed fiber slurry with a fiber diameter of 5-7 microns and a length of 0.2-1 mm, then add 1000 g of cordierite aggregates of 80-100 microns, 1000 g of water glass with a modulus of 2.5-3, and 1000 g of cationic starch, and stir at 200 rpm After 2 hours, a short fiber slurry with a concentration of 15% was prepared.

[0034] The 320Tex twisted continuous high-silica fiber is tensioned by the rotating bracket 1, the tensioner 2 and the tensioner 3, and then passes through the directional roller 5 in the slurry tank 4 equipped with short fiber slurry, and the short fiber slurry passes through the agitator 6. After uniform stirring, the continuous fiber passes through th...

Embodiment 2

[0038] The features of this embodiment that are the same as those of Embodiment 1 will not be described in detail. The features of this embodiment that are different from Embodiment 1 are:

[0039] Add 4000g of chopped mullite fibers below 5mm into a mixer with 50L of water, and stir at a high speed of 600rpm for 1 hour to obtain short fibers with a diameter of 3-5 microns and a length of 0.2-0.5mm, which are uniformly dispersed. Fiber slurry, then add 80-100 micron cordierite aggregate 2000g, concentration 12% aluminum sol 10L, cationic starch 2000g, stir at 200rpm for 1-2 hours to prepare short fiber slurry with a concentration of 13%.

[0040] Using 480Tex untwisted continuous high-silica fiber, after controlling the winding tension, carry out continuous winding on the vacuum mold in the direction of 45°, the winding step spacing is 2mm, and the vacuum degree of the mold is 0.06MPa. During the winding process, the ratio of continuous fiber to short wire is 1:2. After the wi...

Embodiment 3

[0043] The features of this embodiment that are the same as those of Embodiment 1 will not be described in detail. The features of this embodiment that are different from Embodiment 1 are:

[0044] Add 4000g of chopped alumina fibers below 5mm into a mixer with 40L of water, and stir at a high speed of 600rpm for 1 hour to obtain short fibers with a diameter of 5-7 microns and a length of 0.1-0.45mm, which are uniformly dispersed Then add 4000g of 80-100 micron alumina aggregate, 1600g of phosphate, and 800g of carboxymethyl cellulose, and stir at 200rpm for 1-2 hours to prepare short fiber slurry with a concentration of 20%.

[0045] Using 500Tex untwisted continuous alumina fiber, after controlling the winding tension, carry out continuous winding on the vacuum mold in the direction of 45°, the winding step spacing is 2mm, and the vacuum degree of the mold is 0.04-0.05MPa. During the winding process, the ratio of continuous fiber to short wire is 1:1. After the winding thick...

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Abstract

The invention discloses a continuous fiber-reinforced high-temperature ceramic fiber filter element and a preparation method thereof. Continuous ceramic fibers combined with ceramic staple fiber slurry are subjected to winding combination molding on a vacuum die, and then drying demoulding and high-temperature thermal treatment are carried out, so that the high-temperature ceramic fiber filter element is prepared. Through reasonable design of raw materials, the Tex, the winding tension, the proportion of short fiber slurry, the ratio of long fibers to short fibers, the continuous fiber windingangle, the step spacing, the thermal treatment temperature and the like of continuous fiber bundles are continuously controlled, so that the volume density of the finally prepared high-temperature ceramic fiber filter material is controlled to be 0.4-0.7 g/cm<3>, the porosity is 60-75%, the pore diameter is 20-60 microns, the mechanical strength is 5-8 MP, the initial filter resistance is lower than 600 Pa under a standard wind speed condition of 1 m/min (air temperature of 25 DEG C), and the maximum using temperature of the filter element can reach 900 DEG C or above.

Description

technical field [0001] The invention belongs to the field of ceramic filter materials in the field of inorganic non-metallic materials, and in particular relates to a continuous fiber-reinforced high-temperature ceramic fiber filter element and a preparation method. Background technique [0002] High-temperature ceramic filter dust removal technology has the advantages of high operating temperature, wide application range, and high filtration efficiency. It shows great advantages in the field of high-temperature gas purification. Among them, high-temperature ceramic filter material is its core component. Strength has a major impact on its performance in use. [0003] At present, there are mainly two kinds of high-temperature ceramic filter materials that have been developed and applied. One is a high-density particle accumulation filter element that uses silicon carbide and cordierite as raw materials, such as: a patent ZL 200410023972. A high-temperature ceramic membrane f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/20
CPCB01D39/2017B01D2239/10
Inventor 薛友祥赵世凯张久美王响
Owner SHANDONG RES & DESIGN ACADEMY OF IND CERAMICS
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