CN105819851B - aluminum titanate honeycomb ceramic material and preparation method thereof - Google Patents

aluminum titanate honeycomb ceramic material and preparation method thereof Download PDF

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CN105819851B
CN105819851B CN201610136891.2A CN201610136891A CN105819851B CN 105819851 B CN105819851 B CN 105819851B CN 201610136891 A CN201610136891 A CN 201610136891A CN 105819851 B CN105819851 B CN 105819851B
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aluminum titanate
titanate honeycomb
ceramic material
honeycomb ceramic
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CN105819851A (en
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李
李�一
聂达
李顺海
赵逸群
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Yunnan Filter Environment Protection S.ANDT. Co., Ltd.
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Yunnan Filter Environment Protection SAndt Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • 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
    • C04B35/46—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 titanium oxides or titanates
    • C04B35/462—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 titanium oxides or titanates based on titanates
    • C04B35/478—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 titanium oxides or titanates based on titanates based on aluminium titanates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • 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
    • C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • 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
    • C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite

Abstract

A kind of aluminum titanate honeycomb ceramic material and preparation method thereof, including：Aluminium oxide, talcum powder are proportionally weighed, dispersant is added dropwise and stirs evenly；The titanium oxide proportionally weighed, containing barium compound, silica is added；Plastic agent, the pore creating material proportionally weighed is added to be sufficiently stirred；The pure water proportionally weighed is added and extrusion aid is sufficiently stirred；By the pug pugging, removal of impurities, extrusion forming obtains ceramic honey comb green body；It is sintered after the ceramic honey comb green body is dried, obtains aluminum titanate honeycomb ceramics end article.The Extruded Monolithic Celluar Ceramics of the present invention have preparation flow simply controllable, cost of material economy, and product intensity is high.The aluminum titanate honeycomb ceramics prepared through this method are extremely low with its（It is close to zero）Coefficient of thermal expansion, 1450 DEG C or more of refractoriness, disclosure satisfy that engine exhaust gas purification device uses requirement to calorific intensity, thermal shock resistance.

Description

Aluminum titanate honeycomb ceramic material and preparation method thereof
Technical field
The present invention relates to ceramic fields more particularly to a kind of ceramic material and preparation method thereof.
Background technology
With modern industry and science and technology fast development, pair simultaneously there is excellent high temperature resistant and thermal shock resistance ceramic material Demand it is more and more urgent.A kind of structural ceramics material best as high temperature resistance in the low thermal expansion material being currently known Material --- aluminium titanates (Al2Ti05, abbreviation AT), because it is with high-melting-point (1860 DEG C), low thermal coefficient of expansion [K20~1000 DEG C of α= (0.5~1.5) × 10-6℃-1], good thermal shock resistance, anti-corrosion, alkaline-resisting excellent properties and less expensive And it receives much attention.Zhejiang University week woods equality people exists《Material of aluminum titanate is summarized》In think, aluminium titanates be pseudobrookite structural group Compound belongs to rhombic system, and the coefficient of thermal expansion of crystal in different directions is dramatically different, therefore after firing is cooling, by It is excessive in internal stress, generate a large amount of micro-crack in inside.In aluminium titanates crystal structure, each aluminium ion and titanium ion quilt It forms octahedral six oxygen atoms to surround and be located at octahedral center, these TiO6Or AlO6In a axis, b axis directions, It is connected with common edge, in C axis directions, 3 octahedral vertex are connected to form continuous chain, and each chain infinitely prolongs in space It stretches, intersect connection, forms space net structure.This space net structure is macroscopically showing lower thermal expansion system Number, but also substantially reduce the intensity of sintered body simultaneously, hinder the extensive use of alumina titanate ceramics.Aluminium titanates is 750 simultaneously In~1300 DEG C of temperature ranges, Rutile Type and corundum phase are easily resolved into, causes its local internal stress concentration and coefficient of thermal expansion Increase, and loses its excellent thermal shock resistance.This two big disadvantage keeps the industrialized production of aluminium titanates and application and development difficulty larger.
Why alumina titanate ceramics is because the presence of micro-crack makes it in thermal histories with lower coefficient of thermal expansion In show thermal hysteresis.Aluminium titanates during heating, the starting stage since there are micro-cracks for intra-die, in a, b axis On direction, thermally expands caused by lattice particle vibration and offset by micro-crack, thus the highly expanded on the direction a, b is not shown Come, the expansion of material macroscopically shows as the low bulk on c-axis direction, this stage is making up the stage for micro-crack, and material is simultaneously Apparent thermal expansion is not shown.With the raising of temperature, when all micro-cracks of material internal all make up (about 700 DEG C), high thermal expansion functions to；But at this time due to the active force enhancing in material between crystal grain and crystal grain, material internal Particle re-arrangement (850-950 DEG C) occurs for crystal grain, and intercrystalline combination is made to tend to be close.Material is expanded to what both were acted on Superposition, result shows as material, and in this temperature range, there are one unusual negative expansions.Temperature continues to increase, the particle of material When resetting completion, highly expanded plays a leading role, and the expansion of material shows as the average value expanded on three axis：(αa+αb+αc)/3 =9.5 × 10-6℃-1.In the starting stage of cooling procedure, since material is still in hot stage, material has certain deformation energy Power, the thermal stress generated in cooling procedure is also insufficient to make the fine fisssure crack initiation made up, thus, material shows prodigious receipts at this time Contracting；With the decline of temperature, the deformability of material declines, meanwhile, thermal stress accordingly increases.When to a certain extent, thermal stress Effect make material internal start micro-crack occur again, these micro-cracks make crystal show volume expansion, to thermally expand It shows to reduce with temperature on curve, the trend of expansion takes place in material.
With the development of powder technology of preparing, there are many AT powder synthesis process, and 3 classes can be divided by being summed up：Solid phase method, The liquid phase method and chemical gas-phase method of metal or metal alkoxide hydrolysate.But the preparation majority of aluminum titanate honeycomb ceramics is studied Person is to add titanium oxide with aluminium oxide, is sintered and obtains in the case where adding certain stabilizer.
Patent WO2005/018776 discloses a kind of alkali feldspar, spinel structure containing Mg by adding 1~10wt% The sintering that the oxide or MgO of type or the raw material mixing by being sintered the compound containing Mg for being converted to MgO are formed by being sintered Body.
United States Patent (USP) US2010/0230870A1 discloses one kind by adding anorthite and strontium feldspar to stablize aluminium titanates Method, the aluminum titanate honeycomb ceramics with low thermal coefficient of expansion can be obtained after mixed sintering；
The above patent is all to be decomposed by adjusting the type of additive, ratio solving al titanate sintering body heat and low machinery The problem of intensity, but the above patent comes with some shortcomings:The alkali feldspars used can reduce the softening temperature of aluminium titanates, increase Its big coefficient of thermal expansion, sintering temperature is high, high energy consumption.
Invention content
Present invention aims at a kind of aluminum titanate honeycomb ceramic materials of offer and preparation method thereof, can prepare with bee The al titanate sintering body of nest shape structure, low thermal coefficient of expansion, preferable mechanical strength and suitable porosity.
To achieve the above object, aluminum titanate honeycomb ceramic material provided by the invention, including, aluminium oxide, titanium oxide, metatitanic acid Aluminium powder, stabilizer, dispersant, extrusion aid, plastic agent, pore creating material, Yi Jishui；
The stabilizer further comprises, talcum, silica and containing barium compound；
By the primary raw material outside water removal, plastic agent, dispersant, pore creating material, extrusion aid for 100wt% in terms of, the oxidation Aluminium is 45-60wt%, the titanium oxide be 35-45wt%, the talcum 0.5-7.5wt%, the silica 0.5-4wt%, The containing barium compound 0-7wt%, the metatitanic acid aluminium powder 0-10wt%；
Organic Ingredients percentage is the proportion for accounting for all inorganic raw material total amounts, and the dispersant is 0-5wt%, the extruding Auxiliary agent is 0-10wt%, and the plastic agent is 0-5wt%, and the pore creating material is 0-65wt%.
Further, the dispersant is oleic acid or/and potassium laurate.
Further, the extrusion aid is one kind or more in oleic acid, potassium laurate, glycerine, linseed oil and rapeseed oil Kind.
Further, the plastic agent be cellulose, polyethylene glycol, polyvinyl alcohol, flour it is one or more.
Further, the pore creating material is graphite, cellulose, mealy potato, starch, wood powder, flour, paraffin, PMMA, carbon dust It is one or more.
Further, the containing barium compound is that barium carbonate, barium titanate or barium monoxide are one or more.
To achieve the above object, aluminum titanate honeycomb ceramic material preparation method provided by the invention, includes the following steps：
1) aluminium oxide, talcum powder are proportionally weighed, dispersant is added dropwise and stirs evenly；
2) titanium oxide proportionally weighed, containing barium compound, silica is added；
3) plastic agent, the pore creating material proportionally weighed is added to be sufficiently stirred；
4) pure water proportionally weighed is added and extrusion aid is sufficiently stirred；
5) by the pug pugging, removal of impurities, extrusion forming obtains ceramic honey comb green body；
6) it is sintered after the ceramic honey comb green body being dried, obtains aluminum titanate honeycomb ceramics end article.
Further, the dispersant is oleic acid or/and potassium laurate；The extrusion aid is oleic acid, potassium laurate, sweet It is one or more in oil, linseed oil and rapeseed oil；The plastic agent be cellulose, polyethylene glycol, polyvinyl alcohol, flour one Kind is a variety of；The pore creating material be graphite, cellulose, mealy potato, starch, wood powder, flour, paraffin, PMMA, carbon dust one kind or It is a variety of.
Further, the sintering described in step 6) further comprises the steps：To be less than the rate of 1 DEG C/min from room Temperature is raised to 100~180 DEG C；Rate to be less than 1.5 DEG C/min is warming up to 600~1000 DEG C, keeps the temperature 1~10h；To be less than 1.5 DEG C/rate of min is warming up to 1300~1550 DEG C, keep the temperature 2~12h；Rate to be less than 3.5 DEG C/min is cooled to 600~ 1200 DEG C, stop heating, furnace cooling.
To achieve the above object, it is provided by the invention using claim 7-9 any one of them preparation methods prepare Aluminum titanate honeycomb ceramics, coefficient of thermal expansion：Room temperature is -0.5 × 10 to 800 DEG C-6℃-1~2 × 10-8℃-1；Room temperature is to 1000 DEG C be -0.9 × 10-6℃-1~0.5 × 10-6℃-1；A diameter of 1~30 μm of its hole, pore wall thickness are 50~300 μm, porosity It is 20~75%, duct direction compression strength is more than 15Mpa, is 1.6~8Mpa perpendicular to duct direction compression strength.
The aluminum titanate honeycomb ceramic material of the present invention has many advantages, such as cost economy, simple for process, solves due to fine fisssure Aluminum titanate honeycomb ceramic machinery strength reduction caused by line and coefficient of thermal expansion is caused to increase since 1200 DEG C of aluminium titanates decompose Big problem, while by the way that the thin wall honeycomb ceramic of large scale high mesh number can be squeezed out to optimizing and revising for pug plasticity.
The aluminum titanate honeycomb ceramics that the present invention is finally prepared, pore wall thickness are 50~300 μm, 80% or more pore creating material pore-forming Pore diameter distribution in 1~30 μ m, porosity is 20~75%, and duct direction compression strength is more than 15Mpa, perpendicular to hole Road direction compression strength is 1.6~8Mpa.Its coefficient of thermal expansion：Room temperature is -0.5~0.5 × 10 to 800 DEG C-6℃-1, in condition In the case that control is appropriate, -2~2 × 10 can be reached-8℃-1.Room temperature is -0.9~0.9 × 10 to 1000 DEG C-6℃-1, in item In the case that part control is appropriate, -0.5~0.5 × 10 can be reached-6℃-1.The present invention uses talcum, silica, baric Object is closed to stablize aluminium titanates, heat when being cooled to 1200 DEG C can be reduced while not influencing its low thermal coefficient of expansion It decomposes.The method provided through the invention can obtain having room temperature to the aluminum titanate honeycomb ceramics of 800 DEG C of near-zero thermal expansion, The intensity of prepared aluminum titanate honeycomb ceramics disclosure satisfy that the strength demand as engine tail gas purification ceramic honey comb.
Description of the drawings
Fig. 1 is the aluminum titanate honeycomb ceramic material preparation method flow chart according to the present invention；
Thermal dilatometry figure when Fig. 2 is according to the aluminum titanate honeycomb ceramic material room temperature of the present invention to 800 DEG C；
Coefficient of thermal expansion curve graph when Fig. 3 is according to the aluminum titanate honeycomb ceramic material room temperature of the present invention to 1000 DEG C；
Fig. 4 is the XRD spectrum according to the aluminum titanate honeycomb ceramic material of the present invention；
Fig. 5 is the scanning electron microscope (SEM) photograph according to 1500 times of amplification factors of aluminum titanate honeycomb ceramic material of the present invention；
Fig. 6 is the scanning electron microscope (SEM) photograph according to 5000 times of amplification factors of the aluminum titanate honeycomb ceramic material of the present invention.
Specific implementation mode
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
In embodiment, percentage is mass percent.
The aluminum titanate honeycomb ceramic material of the present invention, raw material components include aluminium oxide, metatitanic acid aluminium powder, titanium oxide, are stablized Agent, lubricant, extrusion aid, plastic agent, pore creating material, water；The granularity of used solid material is 200 mesh or more；In raw material Aluminium oxide is technical grade, and purity >=99%, ratio is 45~60wt%；Metatitanic acid aluminium powder ratio is less than 10wt% in raw material；It is former Titanium oxide is technical grade in material, and purity >=99%, ratio is 35~45wt%；Stabilizer refers to reducing aluminium titanates height in raw material Warm is decomposed, and is increased its mechanical strength, is improved the substance of its coefficient of thermal expansion.With water removal, plastic agent, dispersant, pore creating material, squeeze The primary raw material outside auxiliary agent is pressed to be counted for 100wt%, other Material Percentages are the proportion for accounting for primary raw material total amount, dispersant 0- 5wt%, extrusion aid 0-10wt%, plastic agent 0-5wt%, pore creating material 0-65wt%.
Stabilizer used in the present invention is mainly talcum, silica, containing barium compound, wherein talcum ratio be 0.5~ 7.5wt%；Silica ratios are 0.5~4wt%；Containing barium compound refers to barium carbonate, barium titanate or can be converted to corresponding oxygen Change the containing barium compound or barium monoxide of barium content, the ratio of corresponding barium monoxide is less than 6wt%；
Dispersant in raw material, which refers to the amphipathic compounds such as oleic acid, potassium laurate, can make stock dispersion mixing evenly Substance；
Extrusion aid in raw material, which refers to oleic acid, potassium laurate, glycerine, linseed oil, rapeseed oil etc., can improve pug profit The substance of slip；
Plastic agent in raw material refers to the object that cellulose, polyethylene glycol, polyvinyl alcohol, flour etc. improve pug plasticity Matter；
Pore creating material in raw material refers to graphite, cellulose, mealy potato, starch, wood powder, flour, paraffin, PMMA, carbon dust etc. Ceramics can be made to generate the substance of hole in sintering process；
Water in raw material refers to the deionized water that the primary above distilled water or resistivity are more than 15M Ω；
Table 1 be Examples 1 to 27 specific raw material in class and corresponding proportioning (with water removal, plastic agent, dispersant, pore creating material, Primary raw material outside extrusion aid is counted for 100wt%, other Material Percentages are the proportion for accounting for primary raw material total amount)：
The ratio of the specific raw material of 1 Examples 1 to 27 of table
Fig. 1 is according to the aluminum titanate honeycomb ceramic material preparation method flow chart of the present invention, below with reference to Fig. 1, to this The aluminum titanate honeycomb ceramic material preparation method of invention is described in detail.
First, in step 101, aluminium oxide is proportionally weighed, talcum powder mixing is sufficiently stirred；
In step 102, titanium oxide, containing barium compound, silica are proportionally weighed, and is added to obtained by step 101 Mixture in；
In step 103, cellulose is proportionally weighed, and is added in the mixture obtained by step 102；
In step 104, be added in step 103 gained mixture proportionally weigh pure water stirring, be added according to than The potassium laurate stirring that example weighs is added the linseed oil stirring proportionally weighed, obtains the pug with preferable plasticity；
In step 105：The pug that step 104 obtains is put into vacuum pugging in vacuum deairing machine and is cleaned twice Afterwards；Extrusion forming is carried out with extruder, obtains ceramic honey comb green body；
In step 106：The ceramic body of extrusion forming is dried using microwave, obtains dry ceramic body；
In step 107：Dried ceramic honey comb green body is put into agglomerating plant and is sintered；
In step 108：It comes out of the stove to obtain aluminum titanate honeycomb ceramics end article.
The preparation method of the aluminum titanate honeycomb ceramics of the present invention, the temperature setting and heating rate of step 107 sintering process For：Rate to be less than 1 DEG C/min is raised to 100~180 DEG C from room temperature；Rate to be less than 1.5 DEG C/min is warming up to 600~ 1000 DEG C, keep the temperature 1~10h；Rate to be less than 1.5 DEG C/min is warming up to 1300~1550 DEG C, keeps the temperature 2~12h；To be less than The rate of 3.5 DEG C/min is cooled to 600~1200 DEG C, stops heating, furnace cooling.
Preferably, sintering process is：1,150 DEG C are raised to from room temperature with the heating rate of 0.5 DEG C/min；2, with 0.6/min Heating rate rise to 600 DEG C；3,850 DEG C are risen to 0.8 DEG C/min, keeps the temperature 4h；4,1450 DEG C are risen to 0.6 DEG C/min, Keep the temperature 6h；5,800 DEG C are cooled to, last furnace cooling.
Alumina titanate ceramics prepared by the present invention is when room temperature is to 800 DEG C, to be thermally expanded with cellular porous sintered body Coefficient is -0.5~0.5 × 10-6℃-1, it is preferable that -2~2 × 10 can be reached-8℃-1；When room temperature is to 1000 DEG C, system is thermally expanded Number is -0.9~0.9 × 10-6℃-1, it is preferable that -0.5~0.5 × 10 can be reached-6℃-1.(3.8~186) hole/cm2(25~ 1200CPSI), it is preferable that 62 holes/cm2；Pore wall thickness is about 50~300 μm, it is preferable that 150 μm of pore wall thickness；80% or more Pore diameter distribution in 1~30 μ m, porosity is 20~75%, and preferably porosity is 30%；Duct direction pressure resistance Degree is more than 15Mpa, is 1.6~8Mpa, preferably position 7MPa perpendicular to duct direction compression strength.
Thermal dilatometry figure when Fig. 2 is according to the aluminum titanate honeycomb ceramic material room temperature of the present invention to 800 DEG C, such as Fig. 2 Shown, C1~C7 is the thermal dilatometry of -800 DEG C of room temperature, and corresponding coefficient of thermal expansion is C1：1.0224×10-6℃-1, C2： 0.1385×10-6℃-1, C3：0.0879×10-6℃-1, C4：0.0238×10-6℃-1, C5：-0.0411×10-6℃-1, C6：- 0.3046×10-6℃-1, C7：-0.6267×10-6℃-1。
Coefficient of thermal expansion curve graph when Fig. 3 is according to the aluminum titanate honeycomb ceramic material room temperature of the present invention to 1000 DEG C, As shown in figure 3, A1, A2, B3, B4 room temperature, to 1000 DEG C of thermal dilatometries, corresponding coefficient of thermal expansion is A1：0.6978×10-6 ℃-1, A2：0.5944×10-6℃-1, B1：0.2598×10-6℃-1, B2：-0.1781×10-6℃-1。
Fig. 4 is according to the XRD spectrum of the aluminum titanate honeycomb ceramic material of the present invention, as shown in figure 4,1~12 is aluminium titanates Corresponding diffraction maximum, 13,14 be the diffraction maximum of aluminium oxide.Predominantly aluminium titanates phase and small amounts aluminium are can be seen that from attached drawing 4 Phase.The one or more of talcum, silica, containing barium compound in raw material are used as stabilizer, may be with aluminium oxide, oxygen after sintering The composite structure of many oxides such as SiClx, magnesia, barium monoxide stablizes the network structure of aluminium titanates.
Fig. 5 is according to the scanning electron microscope (SEM) photograph of 1500 times of amplification factors of aluminum titanate honeycomb ceramic material of the present invention, and Fig. 6 is root According to the present invention aluminum titanate honeycomb ceramic material 5000 times of amplification factors scanning electron microscope (SEM) photograph, from Figures 5 and 6 as can be seen that 80% or more pore diameter distribution is in 1~30 μ m.
One of ordinary skill in the art will appreciate that：The foregoing is only a preferred embodiment of the present invention, and does not have to In the limitation present invention, although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art For, still can to foregoing embodiments record technical solution modify, or to which part technical characteristic into Row equivalent replacement.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should all include Within protection scope of the present invention.

Claims (10)

1. a kind of aluminum titanate honeycomb ceramic material, which is characterized in that the aluminum titanate honeycomb ceramic material, including, aluminium oxide, oxygen Change titanium, metatitanic acid aluminium powder, stabilizer, dispersant, extrusion aid, plastic agent, pore creating material, Yi Jishui；
The stabilizer further comprises, talcum, silica and containing barium compound；
By aluminium oxide, titanium oxide, metatitanic acid aluminium powder, talcum, silica and containing barium compound for 100wt% in terms of, the aluminium oxide is 45-60wt%, the titanium oxide are 35-45wt%, the talcum 0.5-7.5wt%, the silica 0.5-4wt%, the baric Compound is more than 0wt% and to be less than 7wt%, and the metatitanic acid aluminium powder is more than 0wt% and to be less than 10wt%；
By aluminium oxide, titanium oxide, metatitanic acid aluminium powder, talcum, silica and containing barium compound for 100wt% in terms of, the dispersant is More than 0wt% and it is less than 5wt%, the extrusion aid is more than 0wt% and to be less than 10wt%, and the plastic agent is more than 0wt% and small In 5wt%, the pore creating material is more than 0wt% and to be less than 65wt%.
2. aluminum titanate honeycomb ceramic material according to claim 1, which is characterized in that the dispersant be oleic acid or/and Potassium laurate.
3. aluminum titanate honeycomb ceramic material according to claim 1, which is characterized in that the extrusion aid is oleic acid, the moon It is one or more in cinnamic acid potassium, glycerine, linseed oil and rapeseed oil.
4. aluminum titanate honeycomb ceramic material according to claim 1, which is characterized in that the plastic agent is cellulose, gathers It is one or more in ethylene glycol, polyvinyl alcohol or flour.
5. aluminum titanate honeycomb ceramic material according to claim 1, which is characterized in that the pore creating material is graphite, fiber It is one or more in element, mealy potato, starch, wood powder, flour, paraffin, PMMA or carbon dust.
6. aluminum titanate honeycomb ceramic material according to claim 1, which is characterized in that the containing barium compound is carbonic acid It is one or more in barium, barium titanate or barium monoxide.
7. a kind of preparation method of aluminum titanate honeycomb ceramic material, includes the following steps：
1）Ratio described in accordance with the claim 1 weighs aluminium oxide, talcum, and dispersant is added dropwise and stirs evenly；
2）The titanium oxide proportionally weighed, containing barium compound, silica is added；
3）Plastic agent, the pore creating material proportionally weighed is added to be sufficiently stirred；
4）The water proportionally weighed is added and extrusion aid is sufficiently stirred；
5）By pug pugging, removal of impurities, extrusion forming obtains ceramic honey comb green body；
6）It is sintered after the ceramic honey comb green body is dried, obtains aluminum titanate honeycomb ceramics end article.
8. aluminum titanate honeycomb ceramic material preparation method according to claim 7, which is characterized in that the dispersant is oil Acid or/and potassium laurate；The extrusion aid is one kind or more in oleic acid, potassium laurate, glycerine, linseed oil and rapeseed oil Kind；The plastic agent is the one or more of cellulose, polyethylene glycol, polyvinyl alcohol or flour；The pore creating material is graphite, fibre It ties up one or more in element, mealy potato, starch, wood powder, flour, paraffin, PMMA or carbon dust.
9. aluminum titanate honeycomb ceramic material preparation method according to claim 7, which is characterized in that step 6）The burning Knot further comprises the steps：Rate to be less than 1 DEG C/min is raised to 100~180 DEG C from room temperature；To be less than 1.5 DEG C/min Rate be warming up to 600~1000 DEG C, keep the temperature 1~10h；Rate to be less than 1.5 DEG C/min is warming up to 1300~1550 DEG C, Keep the temperature 2~12h；Rate to be less than 3.5 DEG C/min is cooled to 600~1200 DEG C, stops heating, furnace cooling.
10. a kind of aluminum titanate honeycomb ceramics prepared using claim 7-9 any one of them preparation methods, feature are existed In, the aluminum titanate honeycomb ceramics, coefficient of thermal expansion：Room temperature is -0.5 × 10 to 800 DEG C-6℃-1~2 × 10-8℃-1；Room temperature It is -0.9 × 10 to 1000 DEG C-6℃-1~0.5 × 10-6℃-1；A diameter of 1~30 μm of its hole, pore wall thickness are 50~300 μm, Porosity is 20~75%, and duct direction compression strength is more than 15MPa, is 1.6~8MPa perpendicular to duct direction compression strength.
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CN112174688A (en) * 2020-09-29 2021-01-05 北京科技大学 Method for preparing aluminum titanate composite porous ceramic by adopting two-step solid-phase sintering process
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