CN105836775A - Method for preparing core-shell Al2O3/Al composite powder through precipitation process - Google Patents
Method for preparing core-shell Al2O3/Al composite powder through precipitation process Download PDFInfo
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- CN105836775A CN105836775A CN201610138128.3A CN201610138128A CN105836775A CN 105836775 A CN105836775 A CN 105836775A CN 201610138128 A CN201610138128 A CN 201610138128A CN 105836775 A CN105836775 A CN 105836775A
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- powder
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/34—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/16—Metallic particles coated with a non-metal
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/80—Particles consisting of a mixture of two or more inorganic phases
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a method for preparing core-shell Al2O3/Al composite powder through a precipitation process. The method comprises the following steps: adding aluminum powder into a beaker, then adding distilled water, wherein a mass ratio of aluminum powder to distilled water is 1: 1 to 1: 5, and carrying out stirring to form paste; simultaneously dropping an aluminum nitrate solution with a concentration of 0.01 mol/L and an aqueous solution of ammonia into the aluminum paste, maintaining the pH value of the paste at 7 to 11 and continuing stirring for 0.5 to 3 h; then subjecting the paste in the beaker to filtering, carrying out washing with deionized water three times, then carrying out washing with absolute ethyl alcohol once and drying the obtained precipitate; and calcining the precipitate in a high-temperature furnace at 500 to 800 DEG C for 0.5 to 3 h so as to obtain the core-shell Al2O3/Al composite powder. The method has the advantages of simple and convenient operation, easiness in controlling and low energy consumption.
Description
Technical field
The invention belongs to super-fine material and preparation method thereof, relate to one and there is inorganic particle and preparation method thereof, particularly relate to a kind of method that sedimentation method prepare aluminium oxide parcel aluminium powder.
Background technology
Heterogeneous composite that ceramic metal is made up of metal or alloy and one or more ceramic phases, latter of which accounts for the 15% ~ 85% of material volume, and under preparation temperature, the dissolving alternate with pottery of metal phase is atomic weak.Ceramic metal had both maintained the high rigidity of ceramic material, wear-resistant, corrosion-resistant, high temperature resistant, non-oxidizability and chemical resistance properties, possessing again the high intensity of metal material, high tenacity and higher heat conduction, electric conductivity, Non-metallic components makes ceramic-metal composite material have high rigidity, heat resistance and wearability；The combination by metal phase of the solid particle in ceramic metal, makes ceramic metal have high intensity and plasticity, is the engineering material of a kind of excellent performance.The performance of ceramic-metal composite material depends on metal and the performance of pottery, both percentage by volumes, binding ability and the bond strength of boundary.
α-Al2O3There are the most excellent electromechanical properties, the most sufficiently stable become a kind of most popular ceramic material, α-Al2O3Fusing point be 2050 DEG C, refractoriness be more than 1900 DEG C, its room temperature elevated temperature strength is the highest, and room temperature bending strength is at more than 400MPa.Due to Al2O3Chemical bond between lattice structure intermediate ion is quite strong, and the warm-up movement of ion is more slow to the weakening of ionic bond intensity, and ionic bond just dies down the most at very high temperatures, thus its elevated temperature strength is high, and when 1600 DEG C, comprcssive strength still has 50MPa.Al2O3The chemical stability of pottery is at a relatively high, not with acid-base reaction, and the erosion of anti-most metals.Additionally, O2At Al2O3In diffusion coefficient the lowest, its high temperature steam pressure is the least, thus is also commonly used as oxidation retarder.
Aluminum matrix composite is to study most widely used one in metal-base composites, there is the features such as performance and heat-conductivity conducting is functional, thermal coefficient of expansion is low, good stability of the dimension such as high specific strength and ratio elastic modelling quantity, good wear-resistant, endurance and creep resistant.
Along with new material technology of preparing becomes more meticulous development to microcosmic, the reunion of powder body and scattering problem have become as preparation and development new material and the bottleneck of superfine powder, and the process for treating surface of powder body becomes more and more important.Powder body shell core is exactly a kind of specific process of process for modifying surface, it is simply that using one particle as core, in the method that its one or more other particle of surface shell core forms compound particle.Particle shell nuclear technology not only can prepare multi-functional compound particle, but also is widely used for improving particle surface.Therefore, ultrafine particle shell nuclear technology is widely used in ceramic material, electronic material, biomaterial, pharmaceutical industries, coating, paint, powder metallurgy and military field.At present, shell core formula TiO is occurred in that2, SiC, the composite granule such as graphite, shell core formula Al does not the most occur2O3/ Al composite granule, contributes to strengthening phase and is distributed microcosmic homogenization mutually between matrix, be greatly improved the various performances of ceramic-metal composite.
The sedimentation method are aqueous metal salt and precipitant to be separately added in agitator tank, the method generating solid precipitation.The precipitation generated must scrubbed, filter, be dried, calcine and could prepare finished product.Precipitant is joined after saline solution reacts, precipitation is thermally treated resulting in nano material.Its feature is simple, and purity is high, and granule is controlled, is best suitable for preparing oxide.
Summary of the invention
It is an object of the invention to the weak point overcoming aluminum matrix composite to cause performance to reduce owing to strengthening phase skewness, Al powder raw material is carried out surface process, introduces the enhancing phase of a phase or heterogeneous excellent performance, prepare shell core formula Al2O3/ Al composite granule.
The present invention is that a kind of sedimentation method prepare shell core formula Al2O3The method of/Al composite granule.Its feature is: described method is particularly as follows: first join in beaker by aluminium powder, add distilled water, aluminium powder is 1:1-1:5 with the mass ratio of distilled water, stirring, form slurry, aluminum nitrate solution and the ammonia spirit of 1-0.01mol/L concentration are instilled in aluminium powder slurry simultaneously, the pH value allowing slurry is maintained between 7-11, continue stirring 0.5-3 hour, by slurries filtration in beaker, clean 3 times with deionized water, use washes of absolute alcohol 1 time again, gained precipitate is dried, puts in high temperature furnace 500-800 DEG C and calcine 0.5-3 hour, can be prepared by shell core formula Al2O3/ Al composite granule.
In the shell core formula Al2O3/Al composite granule of preparation, Al2O3 powder body is shell, and Al powder is core, and the particle diameter of described prepared Al2O3 powder body is less than the particle diameter of Al powder.
The present invention has simple, convenient, easily controllable, less energy consumption, shell core formula Al of preparation2O3/ Al composite granule raw material, and can accurately be controlled the shell nulcear properties of shell stratum nucleare by regulation process conditions, such as: thickness, consistency, uniformity etc..
Accompanying drawing explanation
Accompanying drawing 1: the sedimentation method of the present invention prepare shell core formula Al2O3The method flow diagram of/Al composite granule；
Accompanying drawing 2: comparison diagram before and after aluminium powder of the present invention and obtained shell core formula Al2O3/Al composite granule.
Detailed description of the invention
Embodiment
1
:
First 10 grams of aluminium powders are joined in beaker, add 10 milliliters of distilled water, stirring, form slurry, aluminum nitrate solution and the ammonia spirit of 0.01mol/L concentration are instilled in aluminium powder slurry simultaneously, allows the pH value of slurry be maintained at 7, continue stirring 0.5 hour, by slurries filtration in beaker, clean 3 times with deionized water, then with washes of absolute alcohol 1 time, by the drying of gained precipitate, put in high temperature furnace 500 DEG C to calcine 3 hours, can be prepared by shell core formula Al2O3/ Al composite granule.
Embodiment
2
:
First 10 grams of aluminium powders are joined in beaker, add 50 milliliters of distilled water, stirring, form slurry, aluminum nitrate solution and the ammonia spirit of 1mol/L concentration are instilled in aluminium powder slurry simultaneously, allows the pH value of slurry be maintained at 11, continue stirring 3 hours, by slurries filtration in beaker, clean 3 times with deionized water, then with washes of absolute alcohol 1 time, by the drying of gained precipitate, put in high temperature furnace 800 DEG C to calcine 0.5 hour, can be prepared by shell core formula Al2O3/ Al composite granule.
Embodiment 3:
First 50 grams of aluminium powders are joined in beaker, add 100 milliliters of distilled water, stirring, form slurry, aluminum nitrate solution and the ammonia spirit of 0.5mol/L concentration are instilled in aluminium powder slurry simultaneously, allows the pH value of slurry be maintained at 9, continue stirring 1 hour, by slurries filtration in beaker, clean 3 times with deionized water, then with washes of absolute alcohol 1 time, by the drying of gained precipitate, put in high temperature furnace 700 DEG C to calcine 1 hour, can be prepared by shell core formula Al2O3/ Al composite granule, as in figure 2 it is shown, a is aluminium powder in figure, b is shell core formula Al2O3/ Al composite granule.
Claims (2)
1. sedimentation method prepare shell core formula Al2O3The method of/Al composite granule, its feature is: described method is as follows: first join in beaker by aluminium powder, add distilled water, aluminium powder is 1:1-1:5 with the mass ratio of distilled water, stirring, form slurry, aluminum nitrate solution and the ammonia spirit of 1-0.01mol/L concentration are instilled in aluminium powder slurry simultaneously, the pH value allowing slurry is maintained between 7-11, continue stirring 0.5-3 hour, by slurries filtration in beaker, clean 3 times with deionized water, use washes of absolute alcohol 1 time again, gained precipitate is dried, put in high temperature furnace 500-800 DEG C to calcine 0.5-3 hour, can be prepared by shell is Al2O3Powder, core is shell core formula Al of Al powder2O3/ Al composite granule.
2. a kind of sedimentation method as claimed in claim 1 prepare shell core formula Al2O3The method of/Al composite granule, it is characterised in that described prepared shell Al2O3The particle diameter of powder is less than the particle diameter of Al powder in core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610138128.3A CN105836775A (en) | 2016-03-11 | 2016-03-11 | Method for preparing core-shell Al2O3/Al composite powder through precipitation process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610138128.3A CN105836775A (en) | 2016-03-11 | 2016-03-11 | Method for preparing core-shell Al2O3/Al composite powder through precipitation process |
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| CN105836775A true CN105836775A (en) | 2016-08-10 |
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| CN201610138128.3A Pending CN105836775A (en) | 2016-03-11 | 2016-03-11 | Method for preparing core-shell Al2O3/Al composite powder through precipitation process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107414072A (en) * | 2017-07-03 | 2017-12-01 | 湖南宁乡吉唯信金属粉体有限公司 | A kind of preparation method of alumina-coated aluminium powder |
| CN109550940A (en) * | 2017-09-27 | 2019-04-02 | 财团法人金属工业研究发展中心 | Metal-base composites |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673085A (en) * | 2005-01-26 | 2005-09-28 | 中国科学院上海硅酸盐研究所 | Hollow alumina ball preparing process based on wet chemical method |
| CN103606660A (en) * | 2013-11-06 | 2014-02-26 | 中国科学院化学研究所 | Alumina-coated granules, as well as preparation method and application thereof |
-
2016
- 2016-03-11 CN CN201610138128.3A patent/CN105836775A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1673085A (en) * | 2005-01-26 | 2005-09-28 | 中国科学院上海硅酸盐研究所 | Hollow alumina ball preparing process based on wet chemical method |
| CN103606660A (en) * | 2013-11-06 | 2014-02-26 | 中国科学院化学研究所 | Alumina-coated granules, as well as preparation method and application thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107414072A (en) * | 2017-07-03 | 2017-12-01 | 湖南宁乡吉唯信金属粉体有限公司 | A kind of preparation method of alumina-coated aluminium powder |
| CN109550940A (en) * | 2017-09-27 | 2019-04-02 | 财团法人金属工业研究发展中心 | Metal-base composites |
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Application publication date: 20160810 |