CN106631123A - Honeycomb-shaped silicon carbide ceramic carrier, and preparation method and application thereof - Google Patents
Honeycomb-shaped silicon carbide ceramic carrier, and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a honeycomb-shaped silicon carbide ceramic carrier, and a preparation method and an application thereof. The preparation method comprises the following steps: mixing of raw materials: a step of mixing main materials and auxiliary materials so as to obtain a mixed material, wherein the main materials comprise a first silicon carbide powder material with a particle size of 50 to 65 [mu]m and a second silicon carbide powder material with a particle size of 10 to 40 [mu]m, and the auxiliary materials comprise a sintering auxiliary agent, an adhesive and a pore-forming agent; preparation of a green body; and sintering. The honeycomb-shaped silicon carbide ceramic carrier prepared by using the method provided by the invention can be applied to the fields of metallurgy, environmental protection, chemical industry, energy, biology, food and medicine. According to the invention, the use of two silicon carbide powder materials with different particle sizes increases the water content of a clay material and facilitates extrusion of the clay material, so a ceramic carrier with smooth surface is obtained; meanwhile, the ceramic carrier prepared by using the method provided by the invention has the advantages of high porosity, high strength and more applicability to practical application.
Description
Technical field
The present invention relates to a kind of ceramic honeycomb, more particularly to a kind of cellular silicon carbide ceramics carrier and its preparation side
Method and application.
Background technology
Ceramic honey comb is a kind of industrial ceramic of cellular property, is the cellular parallel channels of many insertions inside it,
Due to its have the excellent properties such as high intensity, high temperature resistant, corrosion-resistant, wear-resisting be widely used in heat storage, filler, filtering material and
The fields such as catalyst carrier.
When ceramic honey comb is used as catalyst carrier, infusion process is generally adopted by noble metal, rare earth metal or transition metal etc.
Active component is directly loaded in honeycomb ceramic carrier surface, or first coats the coating material of one layer of uniqueness on honeycomb ceramic carrier surface
Expect load active component again, prepare the catalyst with corresponding activity, be mainly used in automobile exhaust gas purifying, boiler exhaust gas
Denitration (NOx), industrial exhaust gas deodorization, remove toxic and harmful etc..In order that catalyst preferably plays catalytic action, Ying Bao
The active component of card carrier surface has enough rates of uploading, thus should have larger apparent porosity as the ceramic honey comb of carrier
And voidage, it is beneficial to the load of active component.Additionally, the working condition in order to adapt to complexity, should also have good heat steady
The advantages of qualitative, long service life, high intensity.
At present, adopt ceramic monolith based on cordierite, mainly thin using cordierite honeycomb ceramic hole wall, thermal expansion system more
The characteristics of number is little, but because cordierite honeycomb ceramic firing range is narrow, thermal conductivity is low, the catalyst of load is easy to fall off and cause
Catalysis failure, also limit its popularization and application.Silicon carbide honeycomb ceramics are due to its high abrasion, highly corrosion resistant, high thermal conductivity coefficient, warm
The features such as good stability, there is irreplaceable researching value in terms of as catalyst carrier.
Preferably ceramic honeycomb should have the following characteristics that (1) will have enough mechanical strengths as carrier：Carrier will have
Enough mechanical strengths, in case the stress produced during body movement or vibrations etc. so that carrier is destroyed so as to shadow
Ring its performance.(2) enough resistance to sudden heating：Require carrier start repeatedly in electromotor, under the thermal shock stopped working not by
Destruction.Because the change of temperature, carrier can occur expanding, shrink repeatedly, so as to be destroyed.And low thermal coefficient of expansion, it is
The theoretical premise of honeycomb ceramic carrier is produced, can prevent carrier from crackle etc. occur.(3) suitable gap structure or percent opening：
Carrier should not prevent the discharge of engine gas, in order to avoid the performance of electromotor is affected, and the major influence factors of exhaust resistance
It is exactly percent opening, the number of percent opening will specify in certain scope.(4) possesses low thermal capacity and high thermal conductivity：Heat
Capacity is low can to shorten the time that catalyst reaches catalytic reaction temperature, and high thermal conductivity can not only improve the temperature of catalyst
Speed, it is also possible that the Temperature Distribution of carrier is more uniform.(5) larger specific surface area：The size of specific surface area, determines
Its catalytic efficiency, specific surface area is big, and catalytic efficiency is higher in the unit interval, conversely, specific surface area is relatively low, catalysis in the unit interval
Tail gas it is less, conversion ratio is relatively low.(6) not containing makes the material of catalyst poisoning：If containing the material for making catalyst poisoning,
Metallic catalyst catalysis activity can be caused to reduce so that CO conversion ratios are reduced.(7) cheap price：Cheap favourable price in
The promotion and application of ceramic honey comb, etc..
In the preparation process of existing cellular silicon carbide ceramics carrier, due to the water absorbing properties of carborundum it is less, it is unfavorable
In follow-up extrusion step so that obtained ceramic monolith rough surface, and voidage is low, is unfavorable for the negative of consequent activities component
Carry.
The content of the invention
Present invention is primarily targeted at, there is provided a kind of cellular silicon carbide ceramics carrier and its preparation method and application,
Technical problem to be solved is, improves the water absorbing properties of silicon carbide powder, so as to get mud material be easier to be extruded, have
Beneficial to follow-up extrusion molding process so that the surface of obtained cellular silicon carbide ceramics carrier is smooth, and further carries
The high intensity of ceramic monolith, increases the voidage of cellular silicon carbide ceramics carrier, is conducive to the load of active component, from
And it is more suitable for practicality.
The object of the invention to solve the technical problems employs the following technical solutions to realize.
According to a kind of preparation method of cellular silicon carbide ceramics carrier proposed by the present invention, including raw material mixing：Will be main
Material mixes with adjuvant, obtains mixed material, and described major ingredient is described comprising the first sic powder and the second sic powder
The particle diameter of the first sic powder is 50-65 μm, and the particle diameter of the second described sic powder is 10-40 μm, with quality percentage
Content meter, the first described sic powder accounts for the 60-90% of major ingredient, and the second described sic powder accounts for the 10- of major ingredient
40%；Described accessory package contains sintering aid, bonding agent, pore creating material, with weight/mass percentage composition agent, based on described sintering aid
The 1-20% of material, described bonding agent is the 1-10% of major ingredient, and described pore creating material is the 0-10% of major ingredient；Prepare biscuit：Will
Lubricant mixes with water, obtains solution, and described solution is kneaded with described mixed material, obtains plastic mud material, described
Plastic mud material Jing mud refinings, evacuation, extrusion molding, obtain cellular carborundum biscuit；Sintering：By the biscuit drying for obtaining,
Dumping, sintering, that is, obtain described cellular silicon carbide ceramics carrier, and described dump temperature is 300-450 DEG C, the dumping time
For 0.5-2.5h, described sintering temperature is 1000-1300 DEG C, and sintering time is 2-6h.
The object of the invention to solve the technical problems can also be applied to the following technical measures to achieve further.
Preferably, the preparation method of aforesaid a kind of cellular silicon carbide ceramics carrier, wherein described sintering aid is
One or more mixture in sial base clay, Suzhou soil, bentonite, Kaolin.
Preferably, the preparation method of aforesaid a kind of cellular silicon carbide ceramics carrier, wherein described bonding agent is hydroxyl
In propyl methocel, polyethylene glycol oxide, carboxymethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol one or two with
On mixture.
Preferably, the preparation method of aforesaid a kind of cellular silicon carbide ceramics carrier, wherein described pore creating material is work
One or more mixture in property charcoal, graphite, polymethyl methacrylate (PMMA), starch.
Preferably, the preparation method of aforesaid a kind of cellular silicon carbide ceramics carrier, wherein described lubricant is sweet
One or more mixture in oil, Oleum Glycines, Oleum Verniciae fordii, machine oil, in terms of weight/mass percentage composition, based on described lubricant
The 2-5% of material, described water is the 15-50% of major ingredient.
Preferably, the preparation method of aforesaid a kind of cellular silicon carbide ceramics carrier, wherein described drying includes the moon
Dry and dry, described drying in the shade is to place described biscuit 2-3 days under the conditions of cool place, described drying be will dry in the shade after
Biscuit 4-6h under drying at a temperature of 50-80 DEG C, then it is warming up to 100-120 DEG C of drying 5-8h.
Preferably, the preparation method of aforesaid a kind of cellular silicon carbide ceramics carrier, wherein described drying is including micro-
Ripple is dried and dries, and the frequency of described microwave drying is less than 500W, described drying be by the biscuit after microwave drying in
120-130 DEG C of drying 0.5-1h.
The object of the invention to solve the technical problems can also be realized using following technical measures.
According to a kind of cellular silicon carbide ceramics carrier proposed by the present invention, described cellular silicon carbide ceramics carrier by
Above-mentioned preparation method is prepared.
The object of the invention to solve the technical problems can also be applied to the following technical measures to achieve further.
Preferably, aforesaid a kind of cellular silicon carbide ceramics carrier, wherein the cellular silicon carbide ceramics carrier
Apparent porosity is 40-45%；The voidage of described cellular silicon carbide ceramics carrier is 60-70%；Described cellular carbon
Comprcssive strength axial direction >=the 40Mpa of SiClx ceramic monolith；The comprcssive strength radial direction of described cellular silicon carbide ceramics carrier >=
11Mpa。
The object of the invention to solve the technical problems can also be realized using following technical measures.
According to a kind of cellular silicon carbide ceramics carrier proposed by the present invention, described cellular silicon carbide ceramics carrier is used
In metallurgy, environmental protection, chemical industry, the energy, biology, food, medicine and other fields.
By above-mentioned technical proposal, a kind of cellular silicon carbide ceramics carrier of the invention and its preparation method and application, extremely
There are less following advantages：
1st, the invention provides a kind of preparation method of cellular silicon carbide ceramics carrier, the preparation method that the present invention is provided
The water absorbing properties of silicon carbide powder are good, and advantageously in the load of catalytic active component.
The major ingredient of the preparation method of a kind of cellular silicon carbide ceramics that the present invention is provided is the different carbonization of two kinds of particle diameters
Silica flour material, and (account for the 60-90% of major ingredient quality percentage composition) based on the sic powder of big particle diameter (50-65 μm), in right amount
The sic powder (accounting for the 10-40% of major ingredient quality percentage composition) of addition part small particle (10-40 μm), using two kinds of powders
Difference between particle diameter so that diversification passage is formed in the material obtained after mixing, after adding water into mud, diversification passage can
Success " water lock ", so as to increased the water absorbing properties of silicon carbide powder, also advantageously in follow-up extrusion；Meanwhile, lock
Moisture firmly, on the one hand increased the mobility of mud material, be conducive to extrusion, and on the other hand, water is played in mud material
" occupy-place " is acted on, and after being dried, the cellular silicon carbide ceramics carrier of large porosity has been obtained, advantageously in catalytic active component
Load.
The apparent porosity of cellular silicon carbide ceramics carrier prepared by prior art is 15-35%, using present invention acquisition
Product apparent porosity reach as high as 45%；The voidage of cellular silicon carbide ceramics carrier prepared by prior art is 42-
55%, the product obtained using the present invention reaches as high as 70%.
2nd, the preparation method of a kind of cellular silicon carbide ceramics carrier that the present invention is provided, is increasing the same of support voids rate
When, increased the physical properties such as the comprcssive strength of carrier, hot shock resistance.
The present invention uses sial base clay, Suzhou soil, bentonite, Kaolin as sintering aid, increased the modeling of pug
Property, and be conducive to improving the intensity of silicon carbide ceramics carrier.
It is axially >=12Mpa that prior art is prepared into the comprcssive strength of cellular silicon carbide ceramics carrier, using the present invention
The product of acquisition is >=40Mpa；It is radially >=3Mpa that prior art is prepared into the comprcssive strength of cellular silicon carbide ceramics carrier,
The product obtained using the present invention is >=11Mpa.
The cellular silicon carbide ceramics carrier obtained using the present invention, Jing is warm, and shock resistance detection is warming up to 650 with 6 DEG C/min
DEG C, after being incubated 30 minutes, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, 3 nothings of assay are split
Stricture of vagina and breakage.The cellular silicon carbide ceramics carrier that i.e. present invention is prepared has good resistance to sudden heating.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of description, described in detail as after with presently preferred embodiments of the present invention below.
Specific embodiment
Further to illustrate the present invention to reach technological means and effect that predetermined goal of the invention is taken, below in conjunction with
Preferred embodiment, to according to a kind of preparation method of cellular silicon carbide ceramics carrier proposed by the present invention, its specific embodiment party
Formula, structure, feature and its effect, describe in detail as after.In the following description, different " embodiment " or " embodiment " refers to
It is not necessarily same embodiment.Additionally, the special characteristic, structure or feature in one or more embodiments can be by any suitable form
Combination.
The invention provides a kind of preparation method of cellular silicon carbide ceramics carrier.
The major ingredient of the present invention includes the first sic powder and the second sic powder, described the first sic powder
Particle diameter is 50-65 μm, and the particle diameter of the second described sic powder is 10-40 μm, in terms of weight/mass percentage composition, described first
Sic powder is the 60-90% of major ingredient, and the second described sic powder is the 10-40% of major ingredient.
Inventor's research finds that the appropriate particle diameter for increasing carborundum, advantageously in follow-up extrusion molding process, is obtained
The silicon carbide ceramics carrier that surface is smooth, absorption property is good.The present invention utilizes two kinds of different-grain diameter silicon carbide powders, and controls
The ratio of two kinds of particle diameters, based on big particle diameter (50-65 μm), supplemented by small particle (10-40 μm).Big particle diameter forms larger, rule
Passage then, the addition of small particle is filled between the big passage of above-mentioned rule, is ultimately formed the erratic diversification in aperture and is led to
Road, after adding water, the carborundum passage of diversification desirably prevents the loss of moisture, success " water lock " so that obtained pug
Moisture is more in material, increased the lubricity of pug material, so as to advantageously in follow-up extrusion, therefore,
The more smooth Carboround in surface is prepared.
On the other hand, moisture also acts as " occupy-place " effect in pug, after being dried, defines more holes, and then obtains
The higher Carboround of voidage is arrived, advantageously in the absorption of catalyst.
Further, described sintering aid is the one kind or two in sial base clay, Suzhou soil, bentonite, Kaolin
Plant the combination of the above.
The main thing of the cellular silicon carbide ceramics obtained after sintering is by the a-SiC phases such as 6H-SiC, 4H-SiC, 2H-SiC
Composition, the difference of sintering aid can cause above-mentioned a-SiC phase compositions different.The present invention adopts above-mentioned sintering aid, reduces and makes
Impact of the hole agent to silicon carbide ceramics phase composition, has obtained pure silicon carbide ceramics.
Further, described pore creating material is the one kind or two in activated carbon, graphite, polymethyl methacrylate, starch
The mixture of the above is planted, in terms of weight/mass percentage composition, the addition of pore creating material is the 0-10% of major ingredient.
If the phase composition of the component and above-mentioned cellular silicon carbide ceramics from pore creating material can be seen that sintering do not filled
Point, pore creating material can affect the phase component of silicon carbide ceramics so that obtained silicon carbide ceramics is not pure.The present invention is due to make use of
The silicon carbide powder of two kinds of different-grain diameters, (i.e. when the addition of pore creating material is the 0% of major ingredient in the case of without pore creating material
When), also prepare the higher cellular silicon carbide ceramics carrier of voidage.
Embodiment 1
(1) it is 50-65 μm of silicon carbide powder 90g to weigh particle diameter, and particle diameter is 10-40 μm of silicon carbide powder 10g, sial
Base clay 12g, hydroxypropyl methyl cellulose 2g, polyethylene glycol oxide 3g.The ceramic honey comb powder for preparing is placed in batch mixer,
Dry-mixed 0.5 hour.
(2) 3g Oleum Glycines and 30g water are mixed, is stirred, obtain solution；During solution to be poured into the ceramic powder of stirring,
Fully knead 0.5 hour in batch mixer, obtain plastic mud material.Pug is put in extruder and is squeezed Jing after pugging, evacuation
Go out molding, obtain cellular carborundum biscuit, the size and dimension of the biscuit is controlled by the mould in extrusion equipment.
(3) biscuit is first placed 2 days under the shady and cool environment being dried, then the cellular biscuit for drying in the shade is placed at 60 DEG C
Drying 6 hours, is then warming up to again 105 DEG C and dries 8 hours；Dried sample is risen to into 350 DEG C from room temperature and is incubated 2 hours,
1200 DEG C of roastings are then heated to, 4 hours are incubated.
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in the present embodiment is 45%, and voidage is 70%；It is anti-
Compressive Strength is axially 45Mpa, and comprcssive strength is radially 13Mpa；Hot shock resistance detection is warming up to 650 DEG C with 6 DEG C/min, insulation 30
After minute, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, 3 equal flawlesses of assay and breakage.
Embodiment 2
The proportioning of silicon carbide powder is shown in Table 1 in the present embodiment, and other preparation methoies are same as Example 1.
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in the present embodiment is 43%, and voidage is 69%；It is anti-
To for 44Mpa, comprcssive strength B is to for 12Mpa for Compressive Strength A；Hot shock resistance detection is warming up to 650 DEG C with 6 DEG C/min, is incubated 30 points
Zhong Hou, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, 3 equal flawlesses of assay and breakage.
Embodiment 3
The proportioning of silicon carbide powder is shown in Table 1 in the present embodiment, and other preparation methoies are same as Example 1.
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in the present embodiment is 43%, and voidage is 68%；It is anti-
Compressive Strength is axially 42Mpa, and comprcssive strength is radially 13Mpa；Hot shock resistance detection is warming up to 650 DEG C with 6 DEG C/min, insulation 30
After minute, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, 3 equal flawlesses of assay and breakage.
Embodiment 4
The proportioning of silicon carbide powder is shown in Table 1 in the present embodiment, and other preparation methoies are same as Example 1.
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in the present embodiment is 41%, and voidage is 66%；It is anti-
Compressive Strength is axially 41Mpa, and comprcssive strength is radially 11Mpa；Hot shock resistance detection is warming up to 650 DEG C with 6 DEG C/min, insulation 30
After minute, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, 3 equal flawlesses of assay and breakage.
The proportioning of sic powder in embodiment 2-4 of table 1
| Embodiment | 50-65 μm of carborundum | 10-40 μm of carborundum |
| Embodiment 2 | 85g | 15g |
| Embodiment 3 | 80g | 20g |
| Embodiment 4 | 70g | 30g |
From embodiment 1-4 as can be seen that in the case of without pore creating material, that is, porosity height, intensity are obtained high
Cellular silicon carbide ceramics carrier.
Embodiment 5
The species of pore creating material and quality addition are shown in Table 2 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 6
The species of pore creating material and quality addition are shown in Table 2 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 7
The species of pore creating material and quality addition are shown in Table 2 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 8
The species of pore creating material and quality addition are shown in Table 2 in the present embodiment, and other preparation methoies are same as Example 3.
The species and addition of pore creating material in embodiment 5-8 of table 2
| Embodiment | Pore creating material |
| Embodiment 5 | Activated carbon 5g |
| Embodiment 6 | Graphite 7g |
| Embodiment 7 | Starch 10g |
| Embodiment 8 | PMMA 8g |
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in embodiment 5-8 is 40-45%, and voidage is 65-
70%；Comprcssive strength axially >=40Mpa, comprcssive strength radially >=11Mpa；Hot shock resistance detection is warming up to 6 DEG C/min
650 DEG C, after being incubated 30 minutes, taking-up naturally cools in atmosphere greenhouse once, to circulate totally 3 times, 3 equal nothings of assay
Crackle and breakage.
Embodiment 9
The species of adjuvant and quality addition are shown in Table 3 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 10
The species of adjuvant and quality addition are shown in Table 3 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 11
The species of adjuvant and quality addition are shown in Table 3 in the present embodiment, and other preparation methoies are same as Example 3.
The supplementary product kind and addition of embodiment 9-11 of table 3
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in embodiment 9-11 is 40-45%, and voidage is
65-70%；Comprcssive strength axially >=40Mpa, comprcssive strength radially >=11Mpa；Hot shock resistance detection is with 6 DEG C/min intensifications
To 650 DEG C, after insulation 30 minutes, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, and assay 3 times is
Flawless and breakage.
Embodiment 12
The species of adjuvant and quality addition are shown in Table 4 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 13
The species of adjuvant and quality addition are shown in Table 4 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 14
The species of adjuvant and quality addition are shown in Table 4 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 15
The species of adjuvant and quality addition are shown in Table 4 in the present embodiment, and other preparation methoies are same as Example 3.
Embodiment 16
The species of adjuvant and quality addition are shown in Table 4 in the present embodiment, and other preparation methoies are same as Example 3.
The species and addition of the embodiment 12-16 adjuvant of table 4
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in embodiment 12-16 is 40-45%, and voidage is
65-70%；Comprcssive strength axially >=40Mpa, comprcssive strength radially >=11Mpa；Hot shock resistance detection is with 6 DEG C/min intensifications
To 650 DEG C, after insulation 30 minutes, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, and assay 3 times is
Flawless and breakage.
Embodiment 17
The species of adjuvant and quality addition are shown in Table 5 in the present embodiment, and other preparation methoies are same as Example 4.
Embodiment 18
The species of adjuvant and quality addition are shown in Table 5 in the present embodiment, and other preparation methoies are same as Example 4.
Embodiment 19
The species of adjuvant and quality addition are shown in Table 5 in the present embodiment, and other preparation methoies are same as Example 4.
Embodiment 20
The species of adjuvant and quality addition are shown in Table 5 in the present embodiment, and other preparation methoies are same as Example 4.
Embodiment 21
The species of adjuvant and quality addition are shown in Table 5 in the present embodiment, and other preparation methoies are same as Example 4.
The species and quality addition of adjuvant in embodiment 17-21 of table 5
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in embodiment 17-21 is 40-45%, and voidage is
65-70%；Comprcssive strength axially >=40Mpa, comprcssive strength radially >=11Mpa；Hot shock resistance detection is with 6 DEG C/min intensifications
To 650 DEG C, after insulation 30 minutes, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, and assay 3 times is
Flawless and breakage.
Embodiment 22
On the basis of above-described embodiment 4, change drying and roasting step as follows：
Step (1), (2) are with embodiment 4；
Biscuit is first placed 3 days under the shady and cool environment being dried, is dried at then the cellular biscuit for drying in the shade being placed in into 70 DEG C
It is dry 5 hours, 110 DEG C are then warming up to again dries 6 hours；By dried sample at ambient pressure, 380 DEG C of insulations are risen to from room temperature
1.5 hours, 1280 DEG C of roastings are then heated to, be incubated 4 hours.
Embodiment 23
On the basis of above-described embodiment 4, change drying and roasting step as follows：
Step (1), (2) are with embodiment 4；
(3) biscuit is first adopted microwave heating (power is 490W), the moisture in base substrate is discharged, is then added then at 120 DEG C
Heat 0.5 hour；By dried sample at ambient pressure, 350 DEG C are risen to from room temperature and is incubated 1 hour, then heat to 1200 DEG C of roastings
Burn, be incubated 3 hours.
After testing, the apparent porosity of cellular silicon carbide ceramics obtained in embodiment 22,23 is 42-45%, and voidage is
66-70%；Comprcssive strength axially >=40Mpa, comprcssive strength radially >=11Mpa；Hot shock resistance detection is with 6 DEG C/min intensifications
To 650 DEG C, after insulation 30 minutes, taking-up naturally cools in atmosphere greenhouse for once, circulation totally 3 times, and assay 3 times is
Flawless and breakage.
Heretofore described numerical range includes all of numerical value in the range of this, and including any two in the range of this
The value range of numerical value composition.For example, " particle diameter of the first described sic powder is 50-65 μm ", this numerical range includes 50-
All of numerical value between 65, and including any two numerical value in the range of this (for example：55th, the value range (55-60) for 60) constituting；
The different numerical value of the same index occurred in all embodiments of the invention, can in any combination, compositing range value.
Technical characteristic in the claims in the present invention and/or description can be combined, and its compound mode is not limited to power
The combination that profit is obtained in requiring by adduction relationship.It is combined by the technical characteristic in claim and/or description
The technical scheme for arriving, is also protection scope of the present invention.
The above, is only presently preferred embodiments of the present invention, and any pro forma restriction is not made to the present invention, according to
According to any simple modification, equivalent variations and modification that the technical spirit of the present invention is made to above example, this is still fallen within
In the range of bright technical scheme.
Claims (10)
1. a kind of preparation method of cellular silicon carbide ceramics carrier, it is characterised in that：Including,
Raw material mixes：Major ingredient is mixed with adjuvant, mixed material is obtained, described major ingredient includes the first sic powder and second
Sic powder, the particle diameter of the first described sic powder is 50-65 μm, and the particle diameter of the second described sic powder is
10-40 μm, in terms of weight/mass percentage composition, the first described sic powder accounts for the 60-90% of major ingredient, the second described carborundum
Powder accounts for the 10-40% of major ingredient；Described accessory package contains sintering aid, bonding agent, pore creating material, with weight/mass percentage composition agent, institute
The sintering aid stated is the 1-20% of major ingredient, and described bonding agent is the 1-10% of major ingredient, and described pore creating material is the 0- of major ingredient
10%；
Prepare biscuit：Lubricant is mixed with water, solution is obtained, described solution is kneaded with described mixed material, obtained
Plastic mud material, described plastic mud material Jing mud refinings, evacuation, extrusion molding, obtains cellular carborundum biscuit；
Sintering：By the biscuit drying, dumping, the sintering that obtain, that is, described cellular silicon carbide ceramics carrier is obtained, it is described
Dump temperature is 300-450 DEG C, and the dumping time is 0.5-2.5h, and described sintering temperature is 1000-1300 DEG C, and sintering time is
2-6h。
2. the preparation method of a kind of cellular silicon carbide ceramics carrier according to claim 1, it is characterised in that：
Described sintering aid is one or more the mixing in sial base clay, Suzhou soil, bentonite, Kaolin
Thing.
3. the preparation method of a kind of cellular silicon carbide ceramics carrier according to claim 1, it is characterised in that：
Described bonding agent is hydroxypropyl methyl cellulose, polyethylene glycol oxide, carboxymethyl cellulose, hydroxypropyl cellulose, poly- second
One or more mixture in enol.
4. the preparation method of a kind of cellular silicon carbide ceramics carrier according to claim 1, it is characterised in that：
Described pore creating material is one or more the mixing in activated carbon, graphite, polymethyl methacrylate, starch
Thing.
5. the preparation method of a kind of cellular silicon carbide ceramics carrier according to claim 1, it is characterised in that：
Described lubricant is one or more the mixture in glycerol, Oleum Glycines, Oleum Verniciae fordii, machine oil,
In terms of weight/mass percentage composition, described lubricant is the 2-5% of major ingredient, and described water is the 15-50% of major ingredient.
6. the preparation method of a kind of cellular silicon carbide ceramics carrier according to claim 1, it is characterised in that：
Described drying includes drying in the shade and drying, and described drying in the shade is to place described biscuit 2-3 days under the conditions of cool place, institute
The drying stated be the biscuit after drying in the shade is dried at a temperature of 50-80 DEG C under 4-6h, then be warming up to 100-120 DEG C of drying 5-8h.
7. the preparation method of a kind of cellular silicon carbide ceramics carrier according to claim 1, it is characterised in that：
Described drying includes microwave drying and drying, and the frequency of described microwave drying is less than 500W, described drying be by
Biscuit after microwave drying dries 0.5-1h in 120-130 DEG C.
8. a kind of cellular silicon carbide ceramics carrier, it is characterised in that：
Preparation method of the described cellular silicon carbide ceramics carrier by any one of claim 1-7 is prepared.
9. a kind of cellular silicon carbide ceramics carrier according to claim 8, it is characterised in that：
The apparent porosity of described cellular silicon carbide ceramics carrier is 40-45%；
The voidage of described cellular silicon carbide ceramics carrier is 60-70%；
Comprcssive strength axial direction >=the 40Mpa of described cellular silicon carbide ceramics carrier；
Comprcssive strength radial direction >=the 11Mpa of described cellular silicon carbide ceramics carrier.
10. a kind of application of cellular silicon carbide ceramics carrier, it is characterised in that：
A kind of cellular silicon carbide ceramics carrier according to claim 8 or claim 9, described cellular silicon carbide ceramics carrier
For metallurgy, environmental protection, chemical industry, the energy, biology, food, field of medicaments.
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