CN104529524A - Silicon carbide porous ceramic and preparation method thereof - Google Patents
Silicon carbide porous ceramic and preparation method thereof Download PDFInfo
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- CN104529524A CN104529524A CN201410793009.2A CN201410793009A CN104529524A CN 104529524 A CN104529524 A CN 104529524A CN 201410793009 A CN201410793009 A CN 201410793009A CN 104529524 A CN104529524 A CN 104529524A
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Abstract
The invention relates to a preparation method for silicon carbide porous ceramic, belonging to the technical field of ceramic production. The processing method for the silicon carbide porous ceramic comprises the following steps: ball-milling and mixing feldspar, kalolin and silicon dioxide, preparing a carboxymethyl cellulose aqueous solution, mixing SiC and the carboxymethyl cellulose solution in proportion to obtain a mixture I, adding a ceramic binder and graphite to mix with the mixture I to obtain a mixture II, tabletting, sintering and cooling the mixture II. The silicon carbide porous ceramic has characteristics of high bending strength and relatively high porosity.
Description
Technical field
The present invention relates to a kind of pottery and preparation method thereof, particularly a kind of preparation method of carborundum porous ceramics, belongs to technical field of ceramic production.
Background technology
Carborundum porous ceramics is the new function material having a lot of hole in a kind of internal structure, owing to having feature such as low density, high strength, high porosity, hypertonicity, specific surface area large, anticorrosive, anti-oxidant, good thermal insulation, heat-shock resistance and high thermal resistance etc., carborundum porous ceramics obtains in general industry field and high-tech area and applies more and more widely.Can be used as the support of the catalyst etc. of high temperature gas cleaning device, the solid particle filter of diesel emission, filter for molten metal, heat exchanger, sensor, insulation and sound-proof material, vehicle exhaust, in addition, they also have potential application prospect in bio-medical field, and the application of carborundum porous ceramics material is throughout multiple fields such as metallurgy, chemical industry, electronics, the energy, aviation, environmental protection, biologies.Along with increasing and difference to materials'use object and performance requriements carborundum porous ceramics industrial requirement, be developed multiple preparation technology, mainly comprise and add pore-forming material method, foaming, granulation mass area method, Polymeric sponge method etc.
Porous ceramics is widely used in hot gas filtration, and in numerous porous ceramic film material, silicon carbide has good high-temperature stability, low thermal expansivity, high physical strength, is a kind of suitable raw material for high temperature filtration porous ceramics.But because the bond energy of covalent bond of silicon carbide is very high, be difficult to by pressureless sintering, thus add in silicon carbide ceramics powder of being everlasting appropriate, be easy to low sintering vitrified bond powder, bond together with sic powder particle reaction.
Adopt Large stone solid particulate to pile up and the carborundum porous ceramics of bonding formation, as long as make its void content enough high (being such as greater than 36%), the hole between particle will form good interconnectedness, thus improves gas filtration speed.Carborundum porous ceramics has good bending strength, and can be used as the internal layer supporter of asymmetric porous ceramic strainer tube, the outer filter film for asymmetric porous ceramic strainer tube provides a good carrier.
Chinese invention " preparation method of carborundum porous ceramics ", application number 201410005555.5 discloses a kind of preparation method of carborundum porous ceramics, but complex process.
There is following problem in the existing carborundum porous ceramics course of processing: bending strength is more weak, directly affects the work-ing life of asymmetric porous ceramic filter tube; Void content is lower, directly affects carborundum porous ceramics gas filtration speed.How to address these problems is the emphasis of current industry research.
Summary of the invention
The object of the invention is, for the deficiency of existing porous ceramics processing technology, provide a kind of carborundum porous ceramics and preparation method thereof, this ceramic process is simple, can be widely used in hot gas filtration.
To achieve these goals, the present invention is achieved by the following technical solutions:
1, a preparation method for carborundum porous ceramics, comprises the steps:
(1) vitrified bond is made up of kaolin, feldspar and silicon-dioxide, and 65wt% feldspar, 12wt% kaolin and 23wt% silicon-dioxide ball milling are mixed, ball-milling medium is dehydrated alcohol, and Ball-milling Time is 36 h.After ball milling, the median size of vitrified bond powder is 5 μm;
(2) with the carboxymethyl cellulose aqueous solution of deionized water preparation;
(3) ratio of SiC powder and cmc soln 10:1 is in mass ratio mixed, then add vitrified bond and stir;
(4) using 6% as the graphite (median size is 10 μm) of pore-forming material and mixing containing the SiC powder of vitrified bond of preparing above;
(5) the unidirectional disk being pressed into Ф 50 mm of the powder this mixed;
(6) sinter in air atmosphere, heat-up rate is 5 DEG C/min, and soaking time is 3 h, last furnace cooling.
The carboxymethyl cellulose aqueous solution of the described preparation 2% (wt) of step (2);
Select the SiC powder of 87 μm described in step (3) and add 15wt% vitrified bond and stir;
Sintering temperature described in step (6) is (1300 DEG C) near vitrified bond fusing point.
Through repetition test and further investigation, prepared ceramic bonding agent content is 15wt%, guarantees that carborundum porous ceramics can have higher void content and bending strength; The particle diameter of silicon-carbide particle is 87 μm is the best; Sintering temperature is near vitrified bond fusing point (1300 DEG C), unsuitable too high.
The invention has the beneficial effects as follows:
This carborundum porous ceramics adjusts the usage quantity of vitrified bond, the particle diameter of silicon carbide, sintering temperature, makes it have higher void content and bending strength.
Embodiment
Be described in further details the present invention below by example, these examples are only used for the present invention is described, do not limit the scope of the invention;
Embodiment 1
A kind of preparation method of carborundum porous ceramics: the steps include:
(1) vitrified bond is made up of kaolin, feldspar and silicon-dioxide, and 65wt% feldspar, 12wt% kaolin and 23wt% silicon-dioxide ball milling are mixed, ball-milling medium is dehydrated alcohol, Ball-milling Time 36 h.After ball milling, the median size of vitrified bond powder is 5 μm;
(2) with the carboxymethyl cellulose aqueous solution of deionized water preparation 2% (wt);
(3) ratio of SiC powder (126 μm) and cmc soln 10:1 is in mass ratio mixed, then add 10wt% vitrified bond and stir;
(4) using 6% as the graphite (median size is 10 μm) of pore-forming material and mixing containing the SiC powder of vitrified bond of preparing above;
(5) the unidirectional disk being pressed into Ф 50 mm of the powder this mixed;
(6) sinter in air atmosphere, sintering temperature is (1330 DEG C) near vitrified bond fusing point, and heat-up rate is 5 DEG C/min, and soaking time is 3 h, last furnace cooling.
Embodiment 2
A kind of preparation method of carborundum porous ceramics: the steps include:
(1) vitrified bond is made up of kaolin, feldspar and silicon-dioxide, and 65wt% feldspar, 12wt% kaolin and 23wt% silicon-dioxide ball milling are mixed, ball-milling medium is dehydrated alcohol, and Ball-milling Time is 36 h.After ball milling, the median size of vitrified bond powder is 5 μm;
(2) with the carboxymethyl cellulose aqueous solution of deionized water preparation 2% (wt);
(3) ratio of SiC powder (239 μm) and cmc soln 10:1 is in mass ratio mixed, then add 20wt% vitrified bond and stir;
(4) using 6% as the graphite (median size is 10 μm) of pore-forming material and mixing containing the SiC powder of vitrified bond of preparing above;
(5) the unidirectional disk being pressed into Ф 50 mm of the powder this mixed;
(6) sinter in air atmosphere, sintering temperature is (1370 DEG C) near vitrified bond fusing point, and heat-up rate is 5 DEG C/min, and soaking time is 3 h, last furnace cooling.
Embodiment 3
A kind of preparation method of carborundum porous ceramics: the steps include:
(1) vitrified bond is made up of kaolin, feldspar and silicon-dioxide, and 65wt% feldspar, 12wt% kaolin and 23wt% silicon-dioxide ball milling are mixed, ball-milling medium is dehydrated alcohol, and Ball-milling Time is 36 h.After ball milling, the median size of vitrified bond powder is 5 μm;
(2) with the carboxymethyl cellulose aqueous solution of deionized water preparation 2% (wt);
(3) ratio of SiC powder (300 μm) and cmc soln 10:1 is in mass ratio mixed, then add 25wt% vitrified bond and stir;
(4) using 6% as the graphite (median size is 10 μm) of pore-forming material and mixing containing the SiC powder of vitrified bond of preparing above;
(5) the unidirectional disk being pressed into Ф 50 mm of the powder this mixed;
(6) sinter in air atmosphere, sintering temperature is (1400 DEG C) near vitrified bond fusing point, and heat-up rate is 5 DEG C/min, and soaking time is 3 h, last furnace cooling.
Claims (4)
1. a preparation method for carborundum porous ceramics, is characterized in that: comprise the steps:
(1) vitrified bond is made up of kaolin, feldspar and silicon-dioxide, by 65wt% feldspar, 12wt% kaolin and 23wt% silicon-dioxide mixing and ball milling, ball-milling medium is dehydrated alcohol, and Ball-milling Time is 36h, and after ball milling, the median size of vitrified bond powder is 5 μm;
(2) with the carboxymethyl cellulose aqueous solution of deionized water preparation 2% (wt);
(3) ratio of SiC powder and cmc soln 10:1 is in mass ratio mixed, then add vitrified bond and stir;
(4) using 6% as the graphite (median size 10 μm) of pore-forming material and mixing containing the SiC powder of vitrified bond of preparing above;
(5) the unidirectional disk being pressed into Ф 50 mm of the powder this mixed;
(6) sinter in air atmosphere, heat-up rate is 5 DEG C/min, and soaking time is 3 h, last furnace cooling.
2. the preparation method of a kind of carborundum porous ceramics according to claim 1, is characterized in that: the granularity of step (3) described SiC is 87 μm, and adds the vitrified bond of 15wt%.
3. the preparation method of a kind of carborundum porous ceramics according to claim 1, is characterized in that: the sintering temperature described in step (6) is 1200-1300 DEG C.
4. a carborundum porous ceramics, is characterized in that: the method according to claim 1 ~ 3 any one claim obtains carborundum porous ceramics.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106747558A (en) * | 2016-11-30 | 2017-05-31 | 奉新县绿康水质净化科技有限公司 | A kind of micro porous filtration purification stone and preparation method thereof |
| CN106810290A (en) * | 2015-11-27 | 2017-06-09 | 衡阳凯新特种材料科技有限公司 | A kind of preparation method of carborundum porous ceramics |
| CN106839069A (en) * | 2017-02-10 | 2017-06-13 | 上海源紊新能源科技有限公司 | A kind of solar heat wind system with purification function |
| CN107319627A (en) * | 2017-05-27 | 2017-11-07 | 浙江中烟工业有限责任公司 | A kind of heating non-combustion-type tobacco article substrate and preparation method thereof using carborundum as composition |
| CN109020492A (en) * | 2018-10-16 | 2018-12-18 | 萍乡市华星环保工程技术有限公司 | The method of waste ceramic filler preparation use in waste water treatment Ceramic Balls |
| CN109020493A (en) * | 2018-10-16 | 2018-12-18 | 萍乡市华星环保工程技术有限公司 | The regeneration method of desulfurizing tower waste ceramic filler |
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| CN102718494A (en) * | 2012-06-21 | 2012-10-10 | 海南大学 | Preparation method of composite silicon carbide ceramic filter membrane material |
| CN103086732A (en) * | 2013-01-21 | 2013-05-08 | 天津师范大学 | Fiber enhanced silicon carbide porous ceramic and preparation method and application thereof |
| CN104211406A (en) * | 2014-09-05 | 2014-12-17 | 佛山市新战略知识产权文化有限公司 | Silicon carbide ceramic and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102718494A (en) * | 2012-06-21 | 2012-10-10 | 海南大学 | Preparation method of composite silicon carbide ceramic filter membrane material |
| CN103086732A (en) * | 2013-01-21 | 2013-05-08 | 天津师范大学 | Fiber enhanced silicon carbide porous ceramic and preparation method and application thereof |
| CN104211406A (en) * | 2014-09-05 | 2014-12-17 | 佛山市新战略知识产权文化有限公司 | Silicon carbide ceramic and preparation method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106810290A (en) * | 2015-11-27 | 2017-06-09 | 衡阳凯新特种材料科技有限公司 | A kind of preparation method of carborundum porous ceramics |
| CN106747558A (en) * | 2016-11-30 | 2017-05-31 | 奉新县绿康水质净化科技有限公司 | A kind of micro porous filtration purification stone and preparation method thereof |
| CN106839069A (en) * | 2017-02-10 | 2017-06-13 | 上海源紊新能源科技有限公司 | A kind of solar heat wind system with purification function |
| CN107319627A (en) * | 2017-05-27 | 2017-11-07 | 浙江中烟工业有限责任公司 | A kind of heating non-combustion-type tobacco article substrate and preparation method thereof using carborundum as composition |
| CN107319627B (en) * | 2017-05-27 | 2018-10-12 | 浙江中烟工业有限责任公司 | It is the heating non-combustion-type tobacco article substrate formed and preparation method with silicon carbide |
| CN109020492A (en) * | 2018-10-16 | 2018-12-18 | 萍乡市华星环保工程技术有限公司 | The method of waste ceramic filler preparation use in waste water treatment Ceramic Balls |
| CN109020493A (en) * | 2018-10-16 | 2018-12-18 | 萍乡市华星环保工程技术有限公司 | The regeneration method of desulfurizing tower waste ceramic filler |
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