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A kind of silicon nitride bonded silicon carbide ceramic filter and preparation method thereof

A technology of silicon carbide ceramics and filters, which is applied to chemical instruments and methods, ceramic products, membrane filters, etc., can solve the problems of complex manufacturing process, unemphasized stability, and high price of yttrium oxide, and achieve simple manufacturing process and high filtration efficiency. The effect of fast speed and high filtering precision

Active Publication Date: 2021-05-11
HANJIANG HONGYUAN XIANGYANG SILICON CARBIDE SPECIAL CERAMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as the Chinese patent "A Yttrium Oxide Foam Ceramic Filter" (201010511259.4), the ceramic filter has good high temperature resistance, high strength and good filtration performance, but its manufacturing process is complicated, and the price of yttrium oxide is high
[0005] At present, silicon carbide ceramic filters are more researched and developed, such as the Chinese patent "a silicon carbide ceramic filter plate" (201410704684.3), which has the advantage of adopting a three-layer structure, with a more reasonable pore gradient, adjustable pore It is not easy to block when it is used, and its disadvantage is that it does not emphasize its stability at high temperature, and the process is too complicated, and the preparation cost is relatively high

Method used

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  • A kind of silicon nitride bonded silicon carbide ceramic filter and preparation method thereof
  • A kind of silicon nitride bonded silicon carbide ceramic filter and preparation method thereof
  • A kind of silicon nitride bonded silicon carbide ceramic filter and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A silicon nitride bonded silicon carbide ceramic filter plate is prepared from raw materials with the following mass fractions:

[0034]

[0035] The preparation method of the binder is as follows: first mix polyvinyl alcohol, sodium silicate, sodium lignosulfonate and water in a mass ratio of 2:1:2:75, and then dissolve in a water bath (100°C).

[0036] The manufacture method of above-mentioned silicon nitride in conjunction with silicon carbide ceramic filter plate is:

[0037] 1. Put kaolin, metal silicon powder, yttrium-stabilized zirconia and boron carbide into a ball mill, and ball mill for 24 hours until the size is less than 15 μm to obtain a small material;

[0038] 2. Put the coarse silicon carbide sand into the mixer, then add the binder, mix evenly, then add the small material and mix evenly, and get the mixed material of coarse silicon carbide sand covered with fine powder;

[0039] 3. Trapping the mixed material for 48 hours, the temperature of the tra...

Embodiment 2-4

[0046] Embodiment 2-4 is made in the same way as in Example 1, only the particle size of silicon carbide sand in the raw material formula is different, and the raw material formula of Example 2-4 is shown in Table 1 below:

[0047] The raw material formula of table 1 embodiment 2-4

[0048]

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Abstract

The invention discloses a silicon nitride bonded silicon carbide ceramic filter and a preparation method thereof. The ceramic filter is prepared from silicon carbide sand, kaolin, metal silicon powder, additives and binders in a certain ratio. The preparation method is as follows: 1. Ball mill kaolin, metal silicon powder and additives to obtain a small material; 2. Add the binder to silicon carbide, mix evenly, add the small material, and mix well to obtain a mixed material; 3. Mix the mixture 4. Add the granules to the mold and press to form a porous wet billet; 5. Dry the wet billet to obtain a dry billet; 6. Put the dry billet in nitriding Sintering in a furnace to obtain a primary sintered product; 7. Immerse the primary sintered product in the metal silicon powder suspension, take it out and continue sintering. The ceramic filter has high granule binding strength, no slag drop, high temperature resistance, good thermal shock resistance and thermal stability, high filtration precision, high porosity, and concentrated pore diameter distribution. The method is simple, convenient to operate and low in preparation cost.

Description

technical field [0001] The invention relates to the technical field of ceramic filtration, in particular to a silicon nitride bonded silicon carbide ceramic filter and a preparation method thereof. Background technique [0002] In the aluminum refining industry, the commonly used plate filter is a foam ceramic filter. The basic materials of the foam ceramic filter are alumina, zirconia, yttrium oxide, and silicon carbide. [0003] For alumina-based foam filters, the main problems are poor high temperature resistance, poor thermal shock resistance, poor thermal stability and low filtration accuracy. Taking the 30PPI (foam filter model) foam filter as an example, for 10μm or less The filtering capacity of the particles is only 30%, which is completely unable to meet the filtering requirements of precision aluminum products. [0004] For zirconia and yttrium oxide foam filters, the main problem is that they are expensive and harmful to the human body during processing. For ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B38/00B01D39/20
CPCB01D39/20B01D2239/10C04B35/565C04B35/622C04B38/00C04B2235/3217C04B2235/3225C04B2235/3246C04B2235/349C04B2235/3821C04B2235/386C04B2235/3865C04B2235/3873C04B2235/428C04B2235/6562C04B2235/6567
Inventor 李秋南王惠民夏志强吴急涛黄涛
Owner HANJIANG HONGYUAN XIANGYANG SILICON CARBIDE SPECIAL CERAMICS
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