Hydrothermal preparation method for aluminum oxide whiskers at low temperature

An alumina whisker and hydrothermal technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve problems such as high temperature and pressure, high equipment requirements, unfavorable operation, etc., to improve mechanical properties and purity High, high-conversion effects

Inactive Publication Date: 2009-01-07
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has many steps, requires high temperature and pressure, and requires high equipment during the test, which is not conducive to operation.

Method used

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  • Hydrothermal preparation method for aluminum oxide whiskers at low temperature
  • Hydrothermal preparation method for aluminum oxide whiskers at low temperature
  • Hydrothermal preparation method for aluminum oxide whiskers at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] ①Batching process: Dissolve 7.5g of aluminum nitrate in 20ml of distilled water to prepare a solution with a concentration of 1mol / L, add 3.6g of urea to the above-mentioned aluminum nitrate solution, stir at room temperature for half an hour to obtain a transparent and clear sol.

[0019] ② Hydrothermal process: put the prepared transparent and clear sol in a reaction kettle, and react at 120°C for 6 hours to obtain a white precipitate.

[0020] ③ Washing process: the obtained white precipitate is filtered and washed with distilled water, and filtered to obtain a uniform alumina whisker precursor.

[0021] ④ Roasting process: put the precursor in a muffle furnace and bake at 1200°C for 2 hours to obtain alumina whiskers.

[0022] The alumina whisker product was identified as a pure phase by X-ray diffraction. The whisker has an average diameter of 0.5 μm and a length of 5-10 μm; the yield is above 95%. The SEM scanning picture of alumina whisker products is shown in ...

Embodiment 2

[0024] ①Batching process: Dissolve 7.5g of aluminum nitrate in 20ml of distilled water to prepare a solution with a concentration of 1mol / L, add 6.0g of urea to the above-mentioned aluminum nitrate solution, stir at room temperature for half an hour to obtain a transparent and clear sol.

[0025] ② Hydrothermal process: put the prepared transparent and clear sol in a reaction kettle, and react at 120°C for 6 hours to obtain a white precipitate.

[0026] ③ Washing process: the obtained white precipitate is filtered and washed with distilled water, and filtered to obtain a uniform alumina whisker precursor.

[0027] ④ Roasting process: put the precursor in a muffle furnace and bake at 1200°C for 2 hours to obtain alumina whiskers.

[0028] The alumina whisker product was identified as a pure phase by X-ray diffraction. The whisker has an average diameter of 0.5 μm and a length of 5-10 μm; the yield is over 95%. The SEM scanning picture of alumina whisker products is shown in ...

Embodiment 3

[0030] ①Batching process: Dissolve 11.25g of aluminum nitrate in 20ml of distilled water to prepare a solution with a concentration of 1.5mol / L, add 16.2g of urea to the above-mentioned aluminum nitrate solution, and stir at room temperature for half an hour to obtain a transparent and clear sol.

[0031] ② Hydrothermal process: the prepared transparent and clear sol was placed in a reaction kettle, and reacted at 110°C for 8 hours to obtain a white precipitate.

[0032] ③ Washing process: the obtained white precipitate is filtered and washed with distilled water, and filtered to obtain a uniform alumina whisker precursor.

[0033] ④ Roasting process: put the precursor in a muffle furnace and bake at 1200°C for 2 hours to obtain alumina whiskers.

[0034] The alumina whisker product was identified as a pure phase by X-ray diffraction. The whiskers have an average diameter of 0.5 μm and a length of 5-10 μm; the yield is over 95%. The SEM scanning picture of alumina whisker pr...

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Abstract

The invention provides a preparation method of aluminum oxide whisker in the hydrothermal under low temperature. The preparation method comprises the procedures as follows: aluminum nitrate is dissolved in distilled water to prepare the solution with the concentration of 0.5 to 1.5mol / L; urea with the molar weight that is 2 to 10 times more than the aluminum nitrate is added into the aluminum nitrate solution and the solution is stirred until transparent clarified collosol is made; the collosol is placed in a reaction kettle for 6 to 12h under the temperature of 90 DEG C to 120 DEG C to obtain white deposit of the precursor of the alumina whisker; and the white deposit is washed by the distilled water and roasted for 2 to 12h under the temperature of 1100 DEG C to 1300 DEG C and the alumina whisker is made. The alumina whisker prepared by the invention is identified to be pure phase by x-ray diffraction. The average diameter of the alumina whisker is 0.5mum and the length of the alumina whisker is 5 to 10mum. The alumina whisker can be used as an additive for ceramic materials, function materials and metal materials, and the like, and well improve the mechanical property and the heat-resistant property of the materials.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt materials, and relates to a preparation process of an alumina whisker material, in particular to a method for preparing alumina whiskers under low-temperature hydrothermal conditions. Background technique [0002] Whiskers refer to single crystal fiber materials with a diameter of several microns and a length of tens of microns. It has the characteristics of large aspect ratio, no grain (edge) boundary, and the number of defects is smaller than that of polycrystalline. It is precisely because of this intrinsic integrity that whiskers, whose strength is not strictly limited by their surface integrity, are endowed with very tough and non-brittle properties compared to polycrystalline fibers and glass fibers. At present, there are many kinds of whiskers, and aluminum oxide whiskers are one of them. It stands out for its excellent properties such as good mechanical strength, modulus of elasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/10C30B29/20C30B29/62
Inventor 李洁乃学瑛边绍菊刘鑫魏明张志宏李武
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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