CN102976397A - Preparation process of aluminum titanate material - Google Patents
Preparation process of aluminum titanate material Download PDFInfo
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- CN102976397A CN102976397A CN201210527409XA CN201210527409A CN102976397A CN 102976397 A CN102976397 A CN 102976397A CN 201210527409X A CN201210527409X A CN 201210527409XA CN 201210527409 A CN201210527409 A CN 201210527409A CN 102976397 A CN102976397 A CN 102976397A
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Abstract
The invention relates to a preparation method of an aluminum titanate material, which comprises the following steps: (1) preparing raw materials TiO2 and Al2O3 and additives Fe2O3 and SiO2 powder, wherein the mol ratio of the components (TiO2:Al2O3:Fe2O3:SiO2) is (47.5-48.5):(47.5-48.5):(4-6):(4-6); and the mol ratio of TiO2 to Al2O3 is 1:1; (2) mixing the weighed raw materials and additives, and adding 5-10% PVA (polyvinyl alcohol) to prepare a mud-like mixture; (3) drying the mixture in the step (2) until the humidity is 3-6%, manufacturing the mud-like mixture into a cylindrical compression blank having a diameter (fai) of 20 mm and a height of 5-30 mm through a compression molding method, and then keeping the compression blank in a drying box at 100 DEG C for 4-6 hours or drying at room temperature for 24 hours; and (4) placing the compression blank in the step (3) in a high temperature resistance furnace, and heating to 400-1450 DEG C, thus synthesizing the aluminum titanate ceramic material.
Description
Technical field
The present invention relates to a kind of low-thermal-expansion, resistant to elevated temperatures aluminium titanates (Al
2TiO
5) the material preparation method, belong to the synthetic and processing ceramic field of material.
Background technology
Material of aluminum titanate is the type material that integrates low-expansion coefficient and high-melting-point, best a kind of of resistance to elevated temperatures in the present low-expansion material, in addition, it also has that thermal conductivity is low, anti-slag, anti-corrosion, alkaline-resisting and to the not wetting property of various metals and glass, the environment that can be widely used in the conditional request harshnesses such as anti-thermal shock, high temperature resistant, wear-resistant, anticorrosive, alkali resistant particularly requires the occasion of highly heatproof and shockproof.
Disclose for world patent WO2005/018776 number and a kind ofly carried out the al titanate sintering body that sintering forms by the alkali feldspar that adds 1～10 massfraction, the oxide compound that contains the Mg spinel structure or MgO or by the raw mix that contains the Mg compound that sintering transforms MgO.
Disclose by being adjusted at TiO for Japanese Patent 2005-519834 number
2Source power and Al
2O
3The kind of additive, composition and addition in the source power obtain when keeping original thermotolerance and low-expansion coefficient advantage the aluminium titanates technology that the problem of its thermolysis, low mechanical strength obtains improveing.
Above patent all is to improve the thermolysis of aluminium titanates own and the low performance of physical strength by different methods, but but has following deficiency:
(1) be the innovative approach of single aspect, effect is also not obvious.
(2) select the additive aspect, additive is more single and be not optimum additive, and additive is too complicated, will certainly affect like this low bulk of aluminium titanates.
(3) additives ratio well is not controlled within the scope that does not affect the aluminium titanates excellent properties.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, propose a kind of preparation method of aluminium titanates, be included in the TiO that keeps suitable
2Source power and Al
2O
3In the time of the source power particle diameter, add an amount of Fe of molar fraction
2O
3And SiO
2As additive.Fe
2O
3Can significantly suppress the thermolysis of aluminium titanates, improve the stability of aluminium titanates.This is owing to add Fe
3+The Fe that forms
2TiO
5And Al
2TiO
5Belong to the pseudobrookite compound together, can form continuous solid solution Al
2 (1-x)Fe
2xTiO
5, can suppress preferably the thermolysis of aluminium titanates.And do not affect the thermal expansivity of aluminium titanates.Add SiO
2The stability that can not only improve aluminium titanates suppresses the thermolysis of aluminium titanates, and can improve its physical strength, but add-on is too high, will decompose with aluminium titanates, the Al of generation
2O
3Form mullite and thermal expansivity is increased, thereby will keep certain proportional range.Especially, adopt that both are compound can to play better effect, thereby can better reduce crackle, improve the intensity of aluminium titanates and can be good at suppressing the thermolysis of aluminium titanates.The aluminium titanates that obtains is suitable to stupalith.
The invention provides a kind of by TiO
2Powder and Al
2O
3Powder adds a certain amount of oxide addition (Fe
2O
3, SiO
2, MgO etc.) synthetic material of aluminum titanate.
Aluminium titanates of the present invention is with TiO
2Powder and Al
2O
3Powder is main raw material, and oxide addition is the high-temperature behavior that auxiliary material is used to improve aluminium titanates, as suppresses its thermolysis, minimizing crackle raising intensity etc.; Physical strength obtains corresponding raising under the prerequisite that guarantees its lower thermal expansivity.
Material of aluminum titanate of the present invention prepares by following steps:
(1) gets TiO ready
2And Al
2O
3With its oxide addition (Fe
2O
3, SiO
2) powder, wherein: described TiO
2Raw material is the chemical pure level, Al
2O
3Raw material is the technical pure level, and the mol ratio of each feed composition is:
TiO
2：47.5－48.5：
Al
2O
3：47.5－48.5：
Fe
2O
3：4－6：
SiO
2：?4－6；
And TiO
2And Al
2O
3Mol ratio be 1:1;
(2) adopt wet-mixed, namely add 5～10% PVA in said components, wet-mixed becomes mud shape mixture;
(3) mixture with step (2) is dried to humidity 3%～6%, adopt compression-moulding methods, above-mentioned mud shape mixture is made the cylindrical pressure embryo of Φ 20mm, high 5～30mm, in 100 ℃ loft drier, be incubated 4～6 hours, be controlled to be 50 ℃/h from the temperature rise rate of room temperature to 100 ℃, perhaps drying at room temperature 24 hours;
(4) the pressure embryo of step (3) being put into high temperature resistance furnace, is 20～50 ℃/h from room temperature to 400 a ℃ stage temperature rise rate, and 400 ℃～1450 ℃ temperature rise rates are 150 ℃～250 ℃/h, and at 1450 ℃ of lower insulations 3～5 hours, synthetic material of aluminum titanate.
Embodiment
Can further understand the present invention below by specific embodiment.
Embodiment 1:
(1) gets chemical pure TiO ready
2And industrial pure Al
2O
3And oxide addition (Fe
2O
3, SiO
2) powder, wherein: the mole proportioning of each feed composition is: TiO
2: Al
2O
3: Fe
2O
3: SiO
2=47.5:47.5:6:6.
(2) adopt wet-mixed, the PVA wet-mixed that is about to load weighted mixed powder adding 10% becomes mud shape mixture.
When (3) etc. the mixture of (2) gained is dried to humidity and is 5%, adopt compression-moulding methods, above-mentioned mud shape mixture is made the cylindrical pressure embryo of Φ 20mm, high 25mm, will press embryo to be incubated 5 hours in 100 ℃ loft drier again, wherein the temperature rise rate of room temperature to 100 ℃ is 50 ℃/h.
(4) dry good pressure embryo in (3) is put into high temperature resistance furnace, set heating schedule: room temperature to 400 a ℃ stage temperature rise rate is 50 ℃/h, 400 ℃～1450 ℃ temperature rise rates are 200 ℃/h, and 1450 ℃ of lower insulations 3 hours, to guarantee fully synthetic material of aluminum titanate.
Embodiment 2
Mole proportioning by raw material and oxide addition is TiO
2: Al
2O
3: Fe
2O
3: SiO
2=48.5:48.5:4:4.Other processes are with embodiment 1.Synthetic material of aluminum titanate.
Embodiment 3
Mole proportioning by raw material and oxide addition changes TiO into
2: Al
2O
3: Fe
2O
3: SiO
2=48:48:5:5.Other processes are with embodiment 1.Synthetic material of aluminum titanate.
Claims (4)
1. the preparation method of a material of aluminum titanate may further comprise the steps:
(1) gets TiO ready
2And Al
2O
3Raw material and additive Fe
2O
3And SiO
2Powder, wherein: the molar percentage of each component is TiO
2: 47.5-48.5:
Al
2O
3：47.5－48.5：
Fe
2O
3：4－6：
SiO
2：?4－6；
And TiO
2And Al
2O
3Mol ratio be 1:1;
(2) adopt wet-mixed, namely add 5～10% PVA in said components, wet-mixed becomes mud shape mixture;
(3) mixture of step (2) being dried to humidity is 3%～6%, adopt compression-moulding methods, above-mentioned mud shape mixture is made the cylindrical pressure embryo of Φ 20mm, high 5～30mm, in 100 ℃ loft drier, be incubated 4～6 hours, perhaps under room temperature environment dry 24 hours;
(4) the pressure embryo of step (3) is put into high temperature resistance furnace, be warming up to 400 ℃～1450 ℃, synthetic material of aluminum titanate.
2. the preparation method of described material of aluminum titanate according to claim 1 is characterized in that described TiO
2Raw material is the chemical pure level, Al
2O
3Raw material is the technical pure level.
3. the preparation method of described material of aluminum titanate according to claim 1 is characterized in that, the temperature rise rate from room temperature to 100 ℃ in the described step (3) is 50 ℃/h.
4. the preparation method of described material of aluminum titanate according to claim 1, it is characterized in that, be warmed up to 400 ℃ from room temperature first in the described step (4), temperature rise rate is 20～50 ℃/h, be warming up to 1450 ℃ from 400 ℃ again, temperature rise rate is 150 ℃～250 ℃/h, and 1450 ℃ of lower insulations 3～5 hours.
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|---|---|---|---|
| CN201210527409XA CN102976397A (en) | 2012-12-10 | 2012-12-10 | Preparation process of aluminum titanate material |
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|---|---|---|---|
| CN201210527409XA CN102976397A (en) | 2012-12-10 | 2012-12-10 | Preparation process of aluminum titanate material |
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|---|---|
| CN102976397A true CN102976397A (en) | 2013-03-20 |
Family
ID=47850817
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108178658A (en) * | 2018-01-17 | 2018-06-19 | 山东科技大学 | A kind of flyash is the method that raw material prepares aluminum titanate-mullite composite porous ceramic |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357843A (en) * | 2008-08-08 | 2009-02-04 | 东营新科信特陶有限责任公司 | Alumina titanate ceramica lift tube preparation method |
-
2012
- 2012-12-10 CN CN201210527409XA patent/CN102976397A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101357843A (en) * | 2008-08-08 | 2009-02-04 | 东营新科信特陶有限责任公司 | Alumina titanate ceramica lift tube preparation method |
Non-Patent Citations (1)
| Title |
|---|
| JIANG LAN ET AL.: "Effect of additives on properties of aluminium titanate ceramics", 《TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108178658A (en) * | 2018-01-17 | 2018-06-19 | 山东科技大学 | A kind of flyash is the method that raw material prepares aluminum titanate-mullite composite porous ceramic |
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Application publication date: 20130320 |