CN1323051C - Aluminium borate composite porous ceramics and its preparation method - Google Patents
Aluminium borate composite porous ceramics and its preparation method Download PDFInfo
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- CN1323051C CN1323051C CNB2005100189565A CN200510018956A CN1323051C CN 1323051 C CN1323051 C CN 1323051C CN B2005100189565 A CNB2005100189565 A CN B2005100189565A CN 200510018956 A CN200510018956 A CN 200510018956A CN 1323051 C CN1323051 C CN 1323051C
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Abstract
The present invention discloses aluminium borate composite porous ceramic, and a preparation method thereof. The aluminium borate composite porous ceramic is prepared by the method that skeletal materials and mixed powder are mixed according to the weight ratio of 20-90 to 10-80, and then, 1 to 6 wt% of binding agent is added into the mixture to be blended and molded. The molded mixture is dried for 20 to 30 hours at the temperature of 90 to 120DEGC, the temperature is raised to 200 to 500DEGC and is kept for 20 to 280 minutes, and then, the temperature is raised to 700 to 1700DEGC and is kept for 30 to 600 minutes, and next, the molded mixture is cooled naturally. The preparation method of the mixed powder is characterized in that compound fine powder containing aluminium is mixed with boracic acid powder, and the molecular formula of the mixture is AlxByOz, wherein x=16 to 22, y=2 to 5, and z=30 to 36. The compound fine powder containing aluminium is composed of Al<2>O<3>, Al<2>O<3>, 3H<2>O, Al<2>O<3>, and O<3>. The Al<2>O<3> is 0 to 7o wt% of mixed powder, the 3H<2>O is 0 to 80 wt% of mixed powder, and the O<3> is 0 to 70 wt% of mixed powder. The present invention has the characteristics of simple manufacturing process, low cost, easy control, and good heat preservation and ventilation property of the produced ceramic. When combined with other materials, the aluminium borate composite porous ceramic can be used as heat-insulating materials, ventilating ceramic for refining metal melt, etc.
Description
One, technical field
The invention belongs to the porous ceramics technical field, especially relate to a kind of aluminium borate composite porous ceramics and preparation method thereof.
Two, background technology
Because porous ceramics has advantages such as low density, high permeability, corrosion-resistant, excellent heat insulation property, high temperature resistant and long service life, they can be used as high-temperature gas filter, solid particle filter, filter for molten metal, be used at high temperature using the equipment that needs resist chemical, good penetrability, and, handle the aspects such as support of the catalyst of chemical plant refuse and vehicle exhaust as the physical sepn dividing plate.They also can be used as refractory materials, lagging material, transmitter, thermistor and porous piezoceramics, heat exchanger etc.In addition, they also have the potential application prospect in the bio-medical field.In a word, porous ceramics has been widely used in fields such as metallurgy, chemical industry, the energy, environmental protection, biology.
In recent years, the research of aluminum borate pottery is mainly concentrated in the preparation and application of aluminium borate whisker, because the low (2.93g/cm of the density of aluminum borate
3), fusing point height (1440 ℃), its mechanical property can with SiC, Si
3N
4Comparable to; The thermal expansivity of aluminum borate is little by (4.2 * 10
-6/ K), the little (4～5w/ (m.k), thereby have well insulated of thermal conductivity; Aluminum borate has good anti-corrosion, and it boils 8h in 90 ℃ 1 mol HCl solution, and weight only reduces 1%.Thereby aluminum borate makes various matrix materials as add strengthening, and can improve physical strength, thermostability and the erosion resistance of material.
At present, because preparation technology's more complicated of aluminium borate whisker and whisker size are difficult to control, limited the application aspect much of aluminium borate whisker.
(US 4 for a kind of aluminum borate stupalith of high-strength compact, 774,210), for example aluminum oxide, aluminum chloride, aluminium hydroxide, a diaspore and aluminum nitrate and boron trioxide are raw material to adopt aluminum contained compound, add 0.25～10% short burning agent for example boron calcium aluminate, boron magnesium aluminate, boron aluminum phosphate and boron sikicate aluminum etc., though prepare a kind of adiabatic aluminum borate pottery intensity height, density is low, complex process, cost height.
Adopting Burow Solution and boric acid is feedstock production aluminum borate pottery (US 5,183,785), be to calcine at a certain temperature, the powder mix after will calcining then, moulding, sintering processes obtains high porosity, the controlled aluminum borate pottery of pore opening distribution at a certain temperature.Be earlier Burow Solution to be become mud with boric acid, calcining then will be calcined back powder mix moulding again, obtain the aluminum borate pottery at a certain temperature behind the sintering.Though this invention can be prepared void content 40～60%, pore size is the aluminum borate pottery of 0.5 μ m～5 μ m, but the two step calcining procesies that adopt, the technology more complicated.
Three, summary of the invention
The purpose of this invention is to provide a kind of technology simple, with low cost, produce be easy to control, aluminum borate porous ceramics that insulation and permeability are good and preparation method thereof.
For realizing above-mentioned task, the technical solution used in the present invention is: with aggregate and powder mix is 20～90/10～80 to mix by weight, add the wedding agent of 1～6wt%, mixed 5～60 minutes, moulding, drying is 20～30 hours under 90～120 ℃ of conditions, is warmed up to 200～500 ℃ of insulations 20～280 minutes, be warming up to 700～1700 ℃ of insulations 30～600 minutes again, naturally cooling.
Wherein: the preparation method of powder mix is the aluminum contained compound fine powder to be mixed mixed Al with boric acid powder
xB
yO
zFor, x=16～22, y=2～5, z=30～36, aluminiferous compound fine powder is by Al
2O
3Fine powder, Al
2O
33H
2O fine powder, Al
2O
3H
2The O fine powder is formed, and is respectively 0～70wt%, 0～80wt%, the 0～70wt% of powder mix.
Described aggregate is that one or both or two or more particulate matter are formed in corundum, mullite, alumina, magnesia, the magnesium-aluminium spinel.
The granularity of described corundum, mullite, alumina, magnesia, magnesium-aluminium spinel is 5～0mm, Al
2O
3Fine powder, Al
2O
33H
2O fine powder, Al
2O
3H
2The granularity of O fine powder, boric acid powder is less than 180 orders.
Described wedding agent is one or both or the two or more combination in starch, clay, resin, silicon sol, aluminium colloidal sol, polyvinyl alcohol, glycerine, the methylcellulose gum.
Described moulding or press or be ramming or for pouring into a mould, the pressure of mechanical pressing is 45～350MPa for machine.
The speed of described intensification is 50～300 ℃/h, and the speed of Sheng Wening is 50～300 ℃/h again.
Owing to adopt technique scheme, technology of the present invention is simple, with low cost, production is easy to control, utilize aluminiferous compound and boric acid to decompose the preparation hole, by changing raw material granularity and control process parameters, can obtain different apertures, apparent porosity and be 15～80%, porous ceramics, the porous ceramics of being produced has insulation and the good characteristics of permeability.The porous ceramics that makes and other material are compound, can be used as lagging material, metal melt refining with permeable-gas ceramics etc.
Four, embodiment
Embodiment 1
With the fused white corundum of 1.0～0.2mm and powder mix is 60～80/20～40 to mix by weight.Powder mix is by the fused white corundum fine powder of 9-15wt%, α-Al of 15～30wt%
2O
3The aluminium hydroxide fine powder of micro mist, 20～50wt% and boric acid powder mix.Mixed Al
xB
yO
zScope be that x=18, y=4, z=33 add 2～5wt% clay, mix after 10～15 minutes mechanical pressing under 100～300MPa pressure.Drying is 24 hours under 100～110 ℃ of conditions, and the heat-up rate with 100～200 ℃/h is heated to 280～450 ℃ then, is incubated 30～200 minutes; Heat-up rate with 100～200 ℃/h is heated to 800～1600 ℃ again, is incubated 30～240 minutes, takes out behind the naturally cooling.
Adopt X-ray diffraction to analyze its thing phase composite, main thing is aluminum borate (9Al mutually
2O
32B
2O
3) with corundum mutually.Recording its volume density is 2.54g/cm
3, apparent porosity is 35%, and compressive strength is 45MPa, and Gas permeability is 0.44 μ m
2Sample φ 36 * 36mm was immersed in 870 ℃ of molten aluminiums 48 hours, take out sample, cut section, observe, do not see that sample is permeated by molten aluminium.
Embodiment 2
With the magnesium-aluminium spinel of 1-0.5mm and powder mix is 50～70/30～50 to mix by weight.Powder mix is by the fused white corundum fine powder of 12～25wt%, α-Al of 20～35wt%
2O
3The pseudo-boehmite fine powder of micro mist, 20～35wt% mixes with boric acid powder, mixes back Al
xB
yO
zScope be that x=18, y=4, z=33 add the silicon sol of 2～5wt%.Mix after 10～15 minutes mechanical pressing under 150～200MPa pressure.Drying is 24 hours under 100～110 ℃ of conditions, and the heat-up rate with 100～200 ℃/h is heated to 280～450 ℃ then, is incubated 30～200 minutes; Heat-up rate with 100～200 ℃/h is heated to 800～1600 ℃ again, is incubated 30～240 minutes, takes out behind the naturally cooling.
Adopt X-ray diffraction to analyze its thing phase composite, main thing is aluminum borate (9Al mutually
2O
32B
2O
3) with magnesium-aluminium spinel mutually.Recording its volume density is 2.12g/cm
3, apparent porosity is 40%, and compressive strength is 40MPa, and Gas permeability is 0.56 μ m
2Sample φ 36 * 36mm was immersed in 870 ℃ of molten aluminiums 48 hours, take out sample, cut section, observe, do not see that sample is permeated by molten aluminium.
Claims (7)
1, a kind of preparation method of aluminium borate composite porous ceramics, it is characterized in that with aggregate and powder mix being 20～90/10～80 to mix by weight, add the wedding agent of 1～6wt%, mixed 5～60 minutes, moulding, drying is 20～30 hours under 90～120 ℃ of conditions, is warmed up to 200～500 ℃ of insulations 20～280 minutes, be warming up to 700～1700 ℃ of insulations 30～600 minutes again, naturally cooling;
Wherein: the preparation method of powder mix is, the aluminum contained compound fine powder is mixed with boric acid powder, and mixed AlxByOz is, x=16～22, y=2～5, z=30～36, and aluminiferous compound fine powder is by Al
2O
3Fine powder, Al
2O
33H
2O fine powder, Al
2O
3H
2The O fine powder is formed, and is respectively 0～70wt%, 0～80wt%, the 0～70wt% of powder mix.
2, the preparation method of aluminium borate composite porous ceramics according to claim 1 is characterized in that described aggregate is that one or both or two or more particulate matter are formed in corundum, mullite, alumina, magnesia, the magnesium-aluminium spinel.
3, the preparation method of aluminium borate composite porous ceramics according to claim 2, the granularity that it is characterized in that described corundum, mullite, alumina, magnesia, magnesium-aluminium spinel is 5～0mm, Al
2O
3Fine powder, Al
2O
33H
2O fine powder, Al
2O
3H
2The granularity of O fine powder, boric acid powder is less than 180 orders.
4, the preparation method of aluminium borate composite porous ceramics according to claim 1 is characterized in that described wedding agent is one or both or the two or more combination in starch, clay, resin, silicon sol, aluminium colloidal sol, polyvinyl alcohol, glycerine, the methylcellulose gum.
5, the preparation method of aluminium borate composite porous ceramics according to claim 1 is characterized in that described moulding or presses or for ramming or be cast, the pressure of mechanical pressing is 45～350MPa for machine.
6, the preparation method of aluminium borate composite porous ceramics according to claim 1, the speed that it is characterized in that described intensification is 50～300 ℃/h, the speed of Sheng Wening is 50～300 ℃/h again.
7, according to the prepared aluminium borate composite porous ceramics of preparation method of each described aluminium borate composite porous ceramics in the claim 1～6.
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| CN1323051C true CN1323051C (en) | 2007-06-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104418608B (en) * | 2013-08-20 | 2016-08-10 | 中国科学院上海硅酸盐研究所 | The easy fired method of carborundum porous ceramics |
| CN108751968B (en) * | 2018-06-13 | 2020-12-22 | 北京科技大学 | Preparation method of intrinsic pore-forming porous ceramic material |
| CN111205067B (en) * | 2020-01-15 | 2022-04-01 | 武汉科技大学 | Glass-ceramic material for cooperative protection of neutrons and gamma rays and preparation method thereof |
| CN116218491B (en) * | 2023-05-09 | 2023-07-21 | 山东省地质矿产勘查开发局第二水文地质工程地质大队(山东省鲁北地质工程勘察院) | Hydrogel plugging agent, preparation method of hydrogel plugging agent and water-based drilling fluid |
| CN116751073B (en) * | 2023-08-23 | 2023-10-24 | 天津南极星隔热材料有限公司 | Preparation method of lightweight heat-insulating aluminum borate porous ceramic with multistage pore structure |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053364A (en) * | 1989-06-12 | 1991-10-01 | Aluminum Company Of America | Aluminum borate ceramic matrix composite |
| WO1992000253A1 (en) * | 1990-06-29 | 1992-01-09 | Coors Porcelain Company | Aluminum borate ceramics and process for producing same |
| US5098871A (en) * | 1990-12-13 | 1992-03-24 | Aluminum Company Of America | Aluminum borate ceramic matrix composite |
| JPH10251076A (en) * | 1997-03-11 | 1998-09-22 | Nichias Corp | Production of porous inorganic material |
-
2005
- 2005-06-20 CN CNB2005100189565A patent/CN1323051C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5053364A (en) * | 1989-06-12 | 1991-10-01 | Aluminum Company Of America | Aluminum borate ceramic matrix composite |
| WO1992000253A1 (en) * | 1990-06-29 | 1992-01-09 | Coors Porcelain Company | Aluminum borate ceramics and process for producing same |
| US5098871A (en) * | 1990-12-13 | 1992-03-24 | Aluminum Company Of America | Aluminum borate ceramic matrix composite |
| JPH10251076A (en) * | 1997-03-11 | 1998-09-22 | Nichias Corp | Production of porous inorganic material |
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