CN108439965A - A kind of air brick core brick and its preparation method and application - Google Patents
A kind of air brick core brick and its preparation method and application Download PDFInfo
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- CN108439965A CN108439965A CN201810450430.1A CN201810450430A CN108439965A CN 108439965 A CN108439965 A CN 108439965A CN 201810450430 A CN201810450430 A CN 201810450430A CN 108439965 A CN108439965 A CN 108439965A
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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- C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
- C04B2235/3481—Alkaline earth metal alumino-silicates other than clay, e.g. cordierite, beryl, micas such as margarite, plagioclase feldspars such as anorthite, zeolites such as chabazite
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Abstract
The invention discloses a kind of air brick core brick and its preparation method and application, the air brick core brick is made of heat safe ceramic material, and the ceramic material is mainly made of silicon carbide and mullite and contains stomata.The preparation method includes：(1) silicon carbide, silicon source and silicon source are mixed, obtained mixture is put into die for molding, obtains green compact；(2) step (1) described green compact are fired, obtain the air brick core brick.The air brick core brick is used to prepare disperse formula air brick or composite air bricks.Air brick core brick intensity provided by the invention is high, wear-resistant, antiscour, good in thermal shock, and uniform texture, and porosity is big, and gas cell distribution is reasonable and is connected to, easy to use；Preparation method flow provided by the invention is short, easy to operate, of low cost, is appropriate for industrialization production.
Description
Technical field
The invention belongs to refinement outside-furnace technical field, it is related to a kind of air brick core brick and its preparation method and application.
Background technology
Ladle is in external refining, by the air brick mounted on ladle bottom, the inertia such as molten steel injection argon gas into stove
Gas.Gas acutely expands when encountering high temperature, plays the role of stirring molten steel, refining agent, can not only effectively make molten steel component and
Temperature reaches balanced state, and the bubble that disperse is formed can also promote the slag in steelmaking process and shelling of refractory
Or melt disfigurement at reaction product float, to reduce the field trash in molten steel, increase substantially slab quality.Air brick makes
With being acted in the process by several aspects, first, existing at high temperature using or with the frequent temperature variation of refining heat appearance
The thermal stress that material internal is formed, second is that gas expansion makes molten steel to washing away at the top of air brick, third, when intermittently operated
The erosion of slag at the end of molten steel infiltration and casting.After repeated use, air brick tissue is also easy to produce crackle, peels off, or with
Slag-metal reaction and deteriorate.Air brick must have preferable elevated temperature strength, good erosion resistibility and thermal shock resistance
Etc. mechanicals behavior under high temperature.
Common disperse formula breathes freely brick as corundum, chrome corundum, the former is since corundum coefficient of thermal expansion is high, often
It is damaged due to thermal shock causes air brick cracking, peels off, substantially reduces service life, the latter is formed after use due to chromium oxide
Cr VI have toxicity, cause serious injury to human body after contact, and if use after refractory material it is mishandling, can be right
Air and underground water cause serious pollution.Given this, it is desirable to provide one kind can meet air brick requirement and gram
The new product of product disadvantages mentioned above before clothes.Meanwhile disperse formula air brick due to hole it is small, slag and molten steel are difficult to permeate, and keep away
Exempt from slot-type ventilating brick and is easy to the problem of molten steel being infiltrated is resulted in blockage due to solidification when in use.
Therefore, exploitation is a kind of meeting air brick requirement, and intensity is high, air vent aperture is small and the suitable air brick of the porosity
Core brick, have important meaning for this field.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide a kind of air brick core brick and preparation method thereof
And purposes.The core brick intensity of air brick provided by the invention is high, and air penetrability is big, resistance to erosion, and thermal shock resistance is excellent.
For this purpose, the present invention uses following technical scheme：
In a first aspect, the present invention provides a kind of air brick core brick, the air brick core brick is made of ceramic material, the pottery
Ceramic material is mainly made of silicon carbide and mullite, and the ceramic material contains stomata.
In the present invention, in the ceramic material for forming air brick core brick, silicon carbide and mullite cooperate with mutually, and mullite is in carbon
It is grown by pyroreaction on the contact point of SiClx and silicon-carbide particle, forms " the neck combination between silicon-carbide particle
Phase ", this make air brick core brick intensity be improved significantly.Meanwhile having benefited from the synergistic effect of silicon carbide and mullite, this
The high-temperature behavior for inventing the air brick core brick provided is also fine.In addition, air brick core brick provided by the invention also has air penetrability
Greatly, the advantages of stomata uniform, controllable.In the present invention, the ceramic material is high-temperature ceramic materials.The chemical formula of the mullite
For 3Al2O3·2SiO2。
In the present invention, the core brick refers to the brick core of air brick, can be by its welded direct-assembling of outsourcing iron-clad at saturating
Gas brick；Also it can place it in mold, be filled up using castable refractory at union tail end (sometimes also on periphery) and carry and can burn
One end band narrow slit structure is made in the mold of the strip material of erosion；The other end is the combined type air brick of disperse structure.
It is used as currently preferred technical solution below, but not as the limitation to technical solution provided by the invention, leads to
Following preferred technical solution is crossed, can preferably reach and realize the technical purpose and advantageous effect of the present invention.
As currently preferred technical solution, in the ceramic material, the mass fraction of silicon carbide is 80-98wt%,
Such as 80wt%, 82wt%, 84wt%, 86wt%, 88wt%, 90wt%, 92wt%, 96wt% or 98wt% etc., but not
It is only limitted to cited numerical value, other unrequited numerical value are equally applicable in the numberical range.
Preferably, in the ceramic material, the average grain diameter of silicon carbide is 70-300 μm, for example, 70 μm, 80 μm, 90 μm,
100 μm, 125 μm, 150 μm, 175 μm, 200 μm, 225 μm, 250 μm, 275 μm or 300 μm etc., it is not limited to cited
Numerical value, other interior unrequited numerical value of the numberical range are equally applicable.
Preferably, in the ceramic material, the mass fraction of mullite is 2-20wt%, such as 2wt%, 4wt%,
6wt%, 8wt%, 10wt%, 12wt%, 14wt%, 16wt%, 18wt% or 20wt% etc., it is not limited to cited
Numerical value, other interior unrequited numerical value of the numberical range are equally applicable.In the present invention, the mass fraction of mullite is excessively high, can lead
Cause air brick core brick strength reduction；The mass fraction of mullite is too low, also results in air brick core brick strength reduction.
Preferably, in the ceramic material, the average grain diameter of mullite is 0.3-20 μm, such as 0.3 μm, 0.6 μm, 0.9 μ
M, 1 μm, 2 μm, 5 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm or 20 μm etc., it is not limited to cited numerical value,
Other unrequited numerical value are equally applicable in the numberical range.
In the present invention, because the stomata that ceramic material contains is by the gap between particle (silicon carbide and silicon-carbide particle)
It is formed, therefore the average grain diameter by adjusting silicon carbide, the content that can burn the pore creating material of mistake and the mullite of formation is added,
The aperture of stomata can be controlled.
Preferably, in the ceramic material, the mass fraction of impurity in 5wt% hereinafter, such as 5wt%, 4wt%,
3wt%, 2wt%, 1wt% or 0 etc..
Preferably, the impurity includes glass phase and/or cordierite.In the present invention, the glass phase and/or cordierite are
Refer to：Can be glass phase, or cordierite can also be the combination of glass phase and cordierite.In the present invention, a small amount of glass
Glass mutually can play the role of adhesive so that silicon carbide and mullite preferably combine, and a small amount of cordierite has preferable
Thermal stability, but impurity content will excessively be such that the performance of ceramic material deteriorates, and then the performance of air brick core brick is reduced,
In the present invention, impurity will reduce to the greatest extent to promote properties of product.In addition to glass phase and cordierite, it is also possible in impurity containing a small amount of
Corundum or silica, this kind of impurity will reduce to the greatest extent, to improve the high-temperature behavior of material.
Preferably, the ceramic material is bulk ceramics material.That is, the ceramic material of composition air brick core brick is preferably
One entirety, rather than what polylith ceramic material was spliced into.
As currently preferred technical solution, the average pore size of the ceramic material stomata is 20-200 μm, such as 20 μ
M, 40 μm, 60 μm, 80 μm, 100 μm, 120 μm, 140 μm, 160 μm, 180 μm or 200 μm etc., it is not limited to cited
Numerical value, other interior unrequited numerical value of the numberical range are equally applicable.
Preferably, the porosity of the ceramic material is 25-40%, such as 25%, 30%, 35%, 40% or 45% etc.,
It is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are equally applicable.
Preferably, the stomata of the ceramic material is the through hole of distributed in three dimensions.
Preferably, it is interconnected between the stomata of the ceramic material.
Second aspect, the present invention provide a kind of preparation method of the brick of air brick core as described in relation to the first aspect, the method packet
Include following steps：
(1) silicon carbide, silicon source and silicon source are mixed, obtained mixture is put into die for molding, obtains green compact；
(2) step (1) described green compact are fired, obtain the air brick core brick.
In preparation method provided by the invention, the aluminium oxide that silicon source is decomposed to form, with silicon source and a small amount of Oxidation of SiC
The silica of formation reacts in sintering, forms mullite.Preparation method flow provided by the invention is short, operation letter
It is single, it is of low cost, it is appropriate for industrialization production.
As currently preferred technical solution, in step (1), the average grain diameter of the silicon carbide is 70-300 μm, example
Such as 70 μm, 85 μm, 100 μm, 150 μm, 200 μm, 250 μm or 300 μm, it is not limited to cited numerical value, the numerical value
Other unrequited numerical value are equally applicable in range.In the present invention, it is preferable to use by mach close for selected silicon carbide
Like isometrical particle, approximate isometrical particle can make to form uniform particle packing as much as possible between silicon-carbide particle, simultaneously
Form more uniform perforation stomata.
Preferably, in step (1), source of aluminium includes aluminium oxide and/or alumina precursor.In the present invention, the oxygen
Change aluminium and/or alumina precursor refers to：Can be aluminium oxide, or alumina precursor, can also be aluminium oxide and
The combination of alumina precursor.
Preferably, the grain size of the aluminium oxide is 0.1-10 μm, such as 0.1 μm, 0.5 μm, 1 μm, 2 μm, 4 μm, 6 μm, 8 μm
Or 10 μm etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are equally applicable.
Preferably, the aluminium oxide is α-Al2O3And/or ρ-Al2O3.In the present invention, the α-Al2O3And/or ρ-Al2O3
Refer to：Can be α-Al2O3, or ρ-Al2O3, can also be α-Al2O3With ρ-Al2O3Combination.
Preferably, the alumina precursor includes Aluminum sol.Aluminum sol can play the work of bonding agent in the present invention
With.
Preferably, in step (1), the silicon source includes silica and/or silica precursor.In the present invention, institute
It states silica and/or silica precursor refers to：Can be silica, or silica precursor may be used also
Think the combination of silica and silica precursor.
Preferably, the grain size of the silica be 0.1-10 μm, such as 0.1 μm, 0.5 μm, 1 μm, 2 μm, 4 μm, 6 μm, 8
μm or 10 μm etc., it is not limited to cited numerical value, other unrequited numerical value are equally applicable in the numberical range.
Preferably, the silica precursor includes Ludox and/or ethyl orthosilicate.In the present invention, the silicon is molten
Glue and/or ethyl orthosilicate refer to：Can be Ludox, or ethyl orthosilicate can also be Ludox and positive silicic acid
The combination of ethyl ester.Ludox and ethyl orthosilicate can play the role of bonding agent in the present invention.
Preferably, in step (1) source of aluminium and silicon source, the molar ratio of aluminium element and element silicon is 3:1, that is, press mullite
The elemental mole ratios of aluminium and silicon determine the additional proportion of silicon source and silicon source in composition, if dispensing rubbing of deviateing that mullite formed
That ratio, or reaction are incomplete, or are not thorough, then can remain corundum or silica.
Preferably, in step (1), further include：Before mixing, pore creating material is added.
Preferably, the pore creating material includes charcoal powder.
As currently preferred technical solution, in step (1), the mixing includes mechanical agitation.
Preferably, in step (1), the molding includes mechanical pressing and/or manual ramming process.It is described in the present invention
Mechanical pressing and/or manual ramming process refer to：Can be mechanical pressing, or manual ramming process can also be machine
The combination of molded and manual ramming process.
Preferably, in step (1), when source of aluminium and silicon source are solid matter, step (1) further includes：It is mixing
Before, water is added.Water can adjust the dry and wet situation of Solid raw materials, keep mixing more uniform, and the silicon source and silicon source of solid are molten here
Play the role of bonding agent in water.
As currently preferred technical solution, step (1) further includes：Obtained green compact are dried.
Preferably, the drying includes natural drying and/or heat drying, heretofore described to spontaneously dry and/or add
Heated drying refers to：Can be to spontaneously dry, or heat drying can also be the combination spontaneously dried with heat drying.
Preferably, the drying is first to spontaneously dry to reheat drying.
Preferably, the time of the natural drying be 12-36h, such as 12h, 14h, 16h, 18h, 20h, 22h, for 24 hours,
28h, 30h, 32h, 34h or 36h etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range
It is equally applicable, preferably for 24 hours.
Preferably, the temperature of the heat drying is 90-130 DEG C, such as 90 DEG C, 100 DEG C, 110 DEG C, 120 DEG C or 130 DEG C
Deng, it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are equally applicable, preferably 110 DEG C.
Preferably, the time of the heat drying be 12-36h, such as 12h, 14h, 16h, 18h, 20h, 22h, for 24 hours,
28h, 30h, 32h, 34h or 36h etc., it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range
It is equally applicable, preferably for 24 hours.
It is described to fire as two sections of firings in step (2) as currently preferred technical solution.
Preferably, it is described two sections fire in, first segment fire temperature be 550-650 DEG C, such as 550 DEG C, 560 DEG C, 570
DEG C, 580 DEG C, 590 DEG C, 600 DEG C, 610 DEG C, 620 DEG C, 630 DEG C, 640 DEG C or 650 DEG C etc., it is not limited to cited number
Value, other interior unrequited numerical value of the numberical range are equally applicable, preferably 600-620 DEG C.
Preferably, it fires for described two sections, the heating rate that first segment is fired is 0.5-2 DEG C/min, such as 0.5 DEG C/
Min, 0.8 DEG C/min, 1 DEG C/min, 1.2 DEG C/min, 1.4 DEG C/min or 1.5 DEG C/min etc., it is not limited to cited number
Value, other interior unrequited numerical value of the numberical range are equally applicable, preferably 1-1.5 DEG C/min.
Preferably, in two sections of firings, the time that first segment is fired is 0.5-2h, such as 0.5h, 1h, 1.5h or 2h
Deng, it is not limited to cited numerical value, other interior unrequited numerical value of the numberical range are equally applicable, preferably 1h.
Preferably, it is described two sections fire in, second segment fire temperature be 1430-1470 DEG C, such as 1430 DEG C, 1440
DEG C, 1450 DEG C, 1460 DEG C or 1470 DEG C etc., it is not limited to cited numerical value, other are unrequited in the numberical range
Numerical value is equally applicable, preferably 1450 DEG C.
Preferably, in two sections of firings, the heating rate that second segment is fired is 1-3 DEG C/min, such as 1 DEG C/min, 1.5
DEG C/min, 2 DEG C/min, 2.5 DEG C/min or DEG C/min 3 etc., it is not limited to cited numerical value, in the numberical range its
His unrequited numerical value is equally applicable, preferably 2 DEG C/min；
Preferably, in two sections of firings, the time that second segment is fired is 0.5-2h, such as 0.5h, 1h, 1.5h or 2h
Deng it is not limited to cited numerical value, in the numberical range, other unrequited numerical value are equally applicable, such as are preferably
1h。
Preferably, in step (2), the firing carries out in sintering furnace.
Preferably, in step (2), further include：The product furnace cooling that will be obtained after firing.
As the further preferred technical solution of preparation method of the present invention, the described method comprises the following steps：
(1) mechanical agitation is carried out to silicon carbide, silicon source and silicon source, obtained mixture is put into mechanical pressing in mold,
Green compact are obtained, the green compact are first spontaneously dried for 24 hours, then 110 DEG C of heat dryings are for 24 hours, obtain dry green compact；
Wherein, the average grain diameter of silicon carbide is 70-300 μm, and source of aluminium includes aluminium oxide and/or Aluminum sol, the silicon
Source includes silica and/or Ludox, and in silicon source and silicon source, the molar ratio of aluminium element and element silicon is 3:1；
(2) to the green compact of step (1) described drying carried out in sintering furnace two sections firing, first segment fire with 1-1.5 DEG C/
The heating rate of min is warming up to 600-620 DEG C, fires 1h, and second segment is fired is warming up to 1450 with the heating rate of 2 DEG C/min
DEG C, 1h is fired, furnace cooling after firing obtains the air brick core brick.
The third aspect, the present invention provide a kind of purposes of the brick of air brick core as described in relation to the first aspect, the air brick core brick
It is used to prepare disperse formula air brick or composite air bricks.
The shape of air brick core brick provided by the invention can design and produce into cylinder, truncated cone-shaped, rectangular as needed
The various forms such as body, can be used alone, can also be with the refractory material of same material or various unlike materials by pouring into a mould or inlaying
The techniques such as embedding form composite air bricks
Compared with prior art, the invention has the advantages that：
(1) air brick core brick intensity provided by the invention is high, and bending strength reaches 5-30MPa, wear-resistant, antiscour, resists
Thermal shock performance is excellent, and uniform texture, and porosity reaches 25-40%, and stomata average pore size reaches 20-200 μm, stomata
It is reasonably distributed and is connected to, it is easy to use；
(2) preparation method flow provided by the invention is short, easy to operate, of low cost, is appropriate for industrialization production.
Specific implementation mode
For the present invention is better described, it is easy to understand technical scheme of the present invention, below further specifically to the present invention
It is bright.But following embodiments is only the simple example of the present invention, does not represent or limit the scope of the present invention, this
Invention protection domain is subject to claims.
Embodiment 1
The present embodiment provides a kind of preparation method of air brick core brick, specific method is：
Raw material：Industrial silicon carbide powder, grain size d50=100 μm, SiC phases content 99.0%；Alumina powder, grain size d50
=2.1 μm；Reactive alumina, purity 99%, 1.0 μm of average grain diameter；Fine silica powder, 0.27 μm of average grain diameter.
(1) silicon carbide micro-powder 92wt%, alumina powder 2wt%, Reactive alumina 1wt%, silica are weighed
The charcoal powder of micro mist 1wt%, 3wt% are as pore creating material, and by being added in this mixture, the aluminium that salic mass fraction is 1% is molten
Glue waits for that material after mixing, is placed in mold, in 25MPa forming under the pressure through mechanical agitation.After demoulding in air environment
Drying for 24 hours, is placed in 110 DEG C of drying kiln for drying for 24 hours；
(2) it is put in again in sintering furnace and is warming up to 600 DEG C with 1 DEG C/min speed, keep the temperature 1h, organic additive is discharged, then
1450 DEG C are warming up to 2 DEG C/min speed, keeps the temperature 1h.After sintering, air brick core brick is made in furnace cooling.
Air brick core brick manufactured in the present embodiment is made of bulk ceramics material, wherein the mass fraction of silicon carbide is
91.9%, the average grain diameter of silicon carbide is 100 μm, and the mass fraction of mullite is 4.8%, and the average grain diameter of mullite is 2.6 μ
The content of m, impurity are 3.3%, and the ingredient of impurity is glass phase and a small amount of quartzy phase.
The porosity of the ceramic material of group cost implementation air brick core brick is 38.6%, air vent aperture d50=24.6 μm,
Stomata is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick manufactured in the present embodiment is 21.7MPa, wear-resistant, antiscour, thermal shock resistance
It is excellent.
Embodiment 2
The present embodiment provides a kind of preparation method of air brick core brick, specific method is：
Raw material：Silicon carbide powder, grain size d50=200 μm, purity 99.1%；Reactive alumina, purity 99% are average
1.0 μm of grain size；Commercially available Aluminum sol, Ludox.
(1) silicon carbide micro-powder 96wt%, alumina powder 2wt% are weighed, salic quality will be added in this mixture
The Ludox that the Aluminum sol and silica quality score that score is 1wt% are 1wt% is sufficiently stirred through machinery until material
Uniformly, it is put in mold, in 30MPa forming under the pressure.Demoulding is placed on air drying for 24 hours, then 110 DEG C in dry kiln
Lower drying is for 24 hours；
(2) it is put in again in sintering furnace and is warming up to 620 DEG C with 1.5 DEG C/min speed, keep the temperature 1h, organic additive is discharged, so
1450 DEG C are warming up to 2 DEG C/min speed afterwards, keeps the temperature 1h.Furnace cooling obtains required air brick core brick after sintering.
Air brick core brick manufactured in the present embodiment is made of bulk ceramics material, wherein the mass fraction of silicon carbide is
94.7%, the average grain diameter of silicon carbide is 200 μm, and the mass fraction of mullite is 4.8%, and the average grain diameter of mullite is 3.2 μ
The content of m, impurity are 0.5, and the ingredient of impurity is glass phase.
The porosity of the ceramic material of group cost implementation air brick core brick is 37.6%, air vent aperture d50=47.4 μm,
Stomata is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick manufactured in the present embodiment is 24.3MPa, wear-resistant, antiscour, thermal shock resistance
It is excellent.
Embodiment 3
The present embodiment provides a kind of preparation method of air brick core brick, specific method is：
Raw material：Silicon carbide powder, grain size d50=200 μm, purity 99.1%；Aluminum sol and contain SiO2Mass fraction is
28% teos solution.
(1) silicon carbide micro-powder 97wt% is weighed, the aluminium that salic mass fraction is 1.5wt% will be added in this mixture
Colloidal sol and silica quality score are the ethyl orthosilicate of 1.5wt% as bonding agent, and the raw material weighed in proportion pass through
Blender is sufficiently stirred, and is waited for that material is uniformly mixed and is placed in mold, using manual ramming process.Demoulding is placed in air and does
It is dry for 24 hours, be then placed on 110 DEG C of drying kiln for drying for 24 hours；
(2) it is placed in again in sintering furnace and is warming up to 620 DEG C with 1.5 DEG C/min speed, heat preservation 1h can with abundant discharge addition
Then volatile substance is warming up to 1450 DEG C with 2 DEG C/min speed, keep the temperature 1h.Furnace cooling just obtains required breathe freely after sintering
Brick core brick.Air brick is made through iron clad shell and welding tail pipe in core brick.
Air brick core brick manufactured in the present embodiment is made of bulk ceramics material, wherein the mass fraction of silicon carbide is
95.7%, the average grain diameter of silicon carbide is 200 μm, and the mass fraction of mullite is 2.6%, and the average grain diameter of mullite is 4.2 μ
The content of m, impurity are 1.7%, and the ingredient of impurity is glass phase and quartzy phase.
The porosity of the ceramic material of group cost implementation air brick core brick is 38.2%, air vent aperture d50=44.8 μm,
Stomata is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick manufactured in the present embodiment is 25.7MPa, wear-resistant, antiscour, thermal shock resistance
It is excellent.
Embodiment 4
The present embodiment provides a kind of preparation method of air brick core brick, specific method is：
Raw material：Industrial silicon carbide powder, grain size d50=70 μm, SiC phases content 99.9%；Alumina powder (α-Al2O3),
Grain size d50=0.1 μm；Reactive alumina (ρ-Al2O3), purity 99%, 0.1 μm of average grain diameter；Fine silica powder is put down
Equal 0.1 μm of grain size.
(1) silicon carbide micro-powder 78.8wt% is weighed, alumina powder 8.0wt%, Reactive alumina 6.2wt%, two
The charcoal powder of ultrafine silica powder 4.0wt%, 3wt% will be added water in this mixture, material waited for through mechanical agitation as pore creating material
After mixing, it is placed in mold, in 25MPa forming under the pressure.12h is dried after demoulding in air environment, is placed in 90 DEG C
Drying kiln for drying 36h；
(2) it is put in again in sintering furnace and is warming up to 550 DEG C with 0.5 DEG C/min speed, keep the temperature 2h, organic additive is discharged, so
1430 DEG C are warming up to 1 DEG C/min speed afterwards, keeps the temperature 2h.After sintering, air brick core brick is made in furnace cooling.
Air brick core brick manufactured in the present embodiment is made of bulk ceramics material, wherein the mass fraction of silicon carbide is
The average grain diameter of 80wt%, silicon carbide are 70 μm, and the mass fraction of mullite is 20wt%, and the average grain diameter of mullite is 2.3 μ
m。
The porosity of the ceramic material of group cost implementation air brick core brick is 36.2%, and air vent aperture is 20.4 μm, gas
Hole is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick manufactured in the present embodiment is 28.5MPa, wear-resistant, antiscour, thermal shock resistance
It is excellent.
Embodiment 5
The present embodiment provides a kind of preparation method of air brick core brick, specific method is：
Raw material：Industrial silicon carbide powder, grain size d50=300 μm, SiC phases content 99.9%；Alumina powder (α-
Al2O3), grain size d50=10 μm；Reactive alumina (ρ-Al2O3), purity 99%, 10 μm of average grain diameter；Silica is micro-
Powder, 10 μm of average grain diameter.
(1) silicon carbide micro-powder 95.0wt% is weighed, alumina powder 0.7wt%, Reactive alumina 0.8wt%, two
The charcoal powder of ultrafine silica powder 0.5wt%, 3wt% will be added water in this mixture, material waited for through mechanical agitation as pore creating material
After mixing, it is placed in mold, in 25MPa forming under the pressure.36h is dried after demoulding in air environment, is placed in 130 DEG C
Drying kiln for drying 12h；
(2) it is put in again in sintering furnace and is warming up to 650 DEG C with 2 DEG C/min speed, keep the temperature 0.5h, organic additive is discharged, so
1470 DEG C are warming up to 3 DEG C/min speed afterwards, keeps the temperature 0.5h.After sintering, air brick core brick is made in furnace cooling.
Air brick core brick manufactured in the present embodiment is made of bulk ceramics material, wherein the mass fraction of silicon carbide is
The average grain diameter of 98wt%, silicon carbide are 300 μm, and the mass fraction of mullite is 2wt%, and the average grain diameter of mullite is 3.2 μ
m。
The porosity of the ceramic material of group cost implementation air brick core brick is 36.7%, air vent aperture d50=99.6 μm,
Stomata is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick manufactured in the present embodiment is 21.9MPa, wear-resistant, antiscour, thermal shock resistance
It is excellent.
Embodiment 6
The present embodiment provides a kind of preparation method of air brick core brick, specific method with reference to embodiment 1, difference lies in,
In step (1), silicon carbide micro-powder 49.5wt%, alumina powder 20wt%, Reactive alumina 15.5wt%, dioxy are weighed
The charcoal powder of SiClx micro mist 12.0wt%, 3wt% are as pore creating material.
Air brick core brick manufactured in the present embodiment is made of bulk ceramics material, wherein the mass fraction of silicon carbide is
The average grain diameter of 50wt%, silicon carbide are 100 μm, and the mass fraction of mullite is 50wt%, and the average grain diameter of mullite is 3.2
μm。
The porosity of the ceramic material of group cost implementation air brick core brick is 36.2%, air vent aperture d50=9.7 μm,
Stomata is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick manufactured in the present embodiment is 25.6MPa, wear-resistant, antiscour, thermal shock resistance
Preferably.
Comparative example 1
For the specific method of this comparative example with reference to embodiment 1, difference lies in step (1), do not use silicon source (silica
Micro mist) and silicon source (alumina powder, Reactive alumina), silicon carbide micro-powder is used only, and the knot without aluminium and silicon is added
Mixture.
As a result, air brick core brick prepared by this comparative example is made of ceramic material, and be free of in the ceramic material
Mullite is mainly made of silicon carbide, and the average grain diameter of silicon carbide is 100 μm.
The porosity of the ceramic material of group cost comparative example air brick core brick is 39.6%, and air vent aperture is 10.8 μm, gas
Hole is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick prepared by this comparative example is 2.3MPa, wear-resistant, antiscour and thermal shock resistance
It is relatively poor.The preparation method of this comparative example can make combine it is mutually poor, cause the intensity of air brick core brick relatively low.
Comparative example 2
For the specific method of this comparative example with reference to embodiment 1, difference lies in step (1), do not use carborundum powder.
As a result, air brick core brick prepared by this comparative example is made of ceramic material, and be free of in the ceramic material
Silicon carbide is mainly made of mullite, and the average grain diameter of mullite is 120 μm.
The porosity of the ceramic material of group cost comparative example air brick core brick is 37.2%, and air vent aperture is 29.3 μm, gas
Hole is the through hole that distributed in three dimensions is interconnected.
The bending strength of air brick core brick prepared by this comparative example is 5.9MPa, wear-resistant, antiscour and thermal shock resistance
It is relatively poor.
Applicant states that the present invention illustrates the method detailed of the present invention, but the present invention not office by above-described embodiment
It is limited to above-mentioned method detailed, that is, does not mean that the present invention has to rely on above-mentioned method detailed and could implement.Technical field
Technical staff it will be clearly understood that any improvement in the present invention, equivalence replacement and auxiliary element to each raw material of product of the present invention
Addition, the selection etc. of concrete mode, all fall within protection scope of the present invention and the open scope.
Claims (10)
1. a kind of air brick core brick, which is characterized in that the air brick core brick is made of ceramic material, and the ceramic material is main
It is made of silicon carbide and mullite, the ceramic material contains stomata.
2. air brick core brick according to claim 1, which is characterized in that in the ceramic material, the quality point of silicon carbide
Number is 80-98wt%；
Preferably, in the ceramic material, the average grain diameter of silicon carbide is 70-300 μm；
Preferably, in the ceramic material, the mass fraction of mullite is 2-20wt%；
Preferably, in the ceramic material, the average grain diameter of mullite is 0.3-20 μm；
Preferably, in the ceramic material, the mass fraction of impurity is in 5wt% or less；
Preferably, the impurity includes glass phase and/or cordierite；
Preferably, the ceramic material is bulk ceramics material.
3. air brick core brick according to claim 1 or 2, which is characterized in that the average pore size of the ceramic material stomata
It is 20-200 μm；
Preferably, the porosity of the ceramic material is 25-40%；
Preferably, the stomata of the ceramic material is the through hole of distributed in three dimensions；
Preferably, it is interconnected between the stomata of the ceramic material.
4. the preparation method of air brick core brick according to any one of claim 1-3, which is characterized in that the method packet
Include following steps：
(1) silicon carbide, silicon source and silicon source are mixed, obtained mixture is put into die for molding, obtains green compact；
(2) step (1) described green compact are fired, obtain the air brick core brick.
5. preparation method according to claim 4, which is characterized in that in step (1), the average grain diameter of the silicon carbide is
70-300μm；
Preferably, in step (1), source of aluminium includes aluminium oxide and/or alumina precursor；
Preferably, the grain size of the aluminium oxide is 0.1-10 μm；
Preferably, the aluminium oxide is α-Al2O3And/or ρ-Al2O3；
Preferably, the alumina precursor includes Aluminum sol；
Preferably, in step (1), the silicon source includes silica and/or silica precursor；
Preferably, the grain size of the silica is 0.1-10 μm；
Preferably, the silica precursor includes Ludox and/or ethyl orthosilicate；
Preferably, in step (1) source of aluminium and silicon source, the molar ratio of aluminium element and element silicon is 3:1；
Preferably, in step (1), further include：Before mixing, pore creating material is added；
Preferably, the pore creating material includes charcoal powder.
6. preparation method according to any one of claims 1-5, which is characterized in that in step (1), the mixing includes
Mechanical agitation；
Preferably, in step (1), the molding includes mechanical pressing and/or manual ramming process；
Preferably, in step (1), when source of aluminium and silicon source are solid matter, step (1) further includes：Before mixing, add
Enter water.
7. according to the preparation method described in any one of claim 1-6, which is characterized in that step (1) further includes：By what is obtained
Green compact are dried；
Preferably, the drying includes natural drying and/or heat drying；
Preferably, the drying is first to spontaneously dry to reheat drying；
Preferably, the time of the natural drying is 12-36h, preferably for 24 hours；
Preferably, the temperature of the heat drying is 90-130 DEG C, preferably 110 DEG C；
Preferably, the time of the heat drying is 12-36h, preferably for 24 hours.
8. according to the preparation method described in any one of claim 1-7, which is characterized in that in step (2), described fire is two
Section is fired；
Preferably, in two sections of firings, the temperature that first segment is fired is 550-650 DEG C, preferably 600-620 DEG C；
Preferably, it is described two sections fire in, first segment fire heating rate be 0.5-2 DEG C/min, preferably 1-1.5 DEG C/
min；
Preferably, in two sections of firings, the time that first segment is fired is 0.5-2h, preferably 1h；
Preferably, in two sections of firings, the temperature that second segment is fired is 1430-1470 DEG C, preferably 1450 DEG C；
Preferably, in two sections of firings, the heating rate that second segment is fired is 1-3 DEG C/min, preferably 2 DEG C/min；
Preferably, in two sections of firings, the time that second segment is fired is 0.5-2h, preferably 1h；
Preferably, in step (2), the firing carries out in sintering furnace；
Preferably, in step (2), further include：The product furnace cooling that will be obtained after firing.
9. according to the preparation method described in any one of claim 1-8, which is characterized in that the described method comprises the following steps：
(1) mechanical agitation is carried out to silicon carbide, silicon source and silicon source, obtained mixture is put into mechanical pressing in mold, is obtained
Green compact first spontaneously dry the green compact for 24 hours, then 110 DEG C of heat dryings are for 24 hours, obtain dry green compact；
Wherein, the average grain diameter of silicon carbide is 70-300 μm, and source of aluminium includes aluminium oxide and/or Aluminum sol, the silicon source packet
Include silica and/or Ludox, in silicon source and silicon source, the molar ratio of aluminium element and element silicon is 3:1；
(2) two sections of firings are carried out in sintering furnace to the green compact of step (1) described drying, first segment is fired with 1-1.5 DEG C/min
Heating rate be warming up to 600-620 DEG C, fire 1h, second segment is fired is warming up to 1450 DEG C with the heating rate of 2 DEG C/min, burns
1h processed, furnace cooling after firing obtain the air brick core brick.
10. according to the purposes of claim 1-3 any one of them air brick core bricks, which is characterized in that the air brick core brick
It is used to prepare disperse formula air brick or composite air bricks.
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