Preparation method of porous boron nitride fibers with high specific surface area
A technology of boron nitride fiber and high specific surface area, which is applied in the direction of artificial filaments made of inorganic materials, can solve the problems of high cost and risk, long production cycle of freeze-drying technology, unsuitable for large-scale production, etc., and achieves easy promotion and low cost. Crystallinity, practical effect
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[0039] A preparation method of porous boron nitride fiber. This method mainly has four steps. Mainly, the precursor is prepared in a water bath, dried after suction filtration, calcined in a nitrogen atmosphere, and decarbonized by air heat treatment.
[0040] (1). Add boric acid, melamine and PEG600 into a container filled with deionized water, then put it into a water bath with a temperature of 90°C, and stir until a clear solution is obtained. After natural cooling, a white floc was obtained, and after suction filtration, a white solid was obtained.
[0041] (2). Wherein, the concentration of melamine is 0.125mol / ml, the concentration of boric acid is 0.375mol / ml, and the molar ratio boric acid: melamine is 3:1. The content of PEG600 is 0.5%, 1%, 2%.
[0042] (3). Place the white solid obtained in step 1 in an oven between 85° C. and 90° C. and keep it warm for 3-4 hours. A white solid is obtained, which is the boron nitride precursor.
[0043] (4). The boron nitride p...
Embodiment 1
[0048] A method for preparing porous boron nitride fibers with a high specific surface area, comprising the following steps:
[0049] (1). Put weighing paper and a clean beaker on the electronic balance, take 4.635g of boric acid, 3.15g of melamine and 2g of PEG600 with a clean medicine spoon, and put them into the beaker. Pipette 200ml of deionized water with a graduated cylinder and pour it into the same beaker.
[0050](2). Put the mixed solution in a water bath and heat it in the water bath. The temperature of the water bath was 90 °C until the mixed solution became a clear solution. Stop heating, the mixed solution is gradually cooled to room temperature, and white flocculent precipitates gradually precipitate out of the solution. The obtained solution is suction filtered, and the obtained solid is placed in an oven for drying. The drying temperature is 90°C, and the holding time is 3h. , to obtain the boron nitride precursor.
[0051] (3). The obtained precursor was p...
Embodiment 2
[0055] A method for preparing porous boron nitride fibers with a high specific surface area, comprising the following steps:
[0056] (1). Put weighing paper and a clean beaker on the electronic balance, take 4.635g of boric acid, 3.15g of melamine and 4g of PEG600 with a clean medicine spoon, and put them into the beaker. Pipette 200ml of deionized water with a graduated cylinder and pour it into the same beaker.
[0057] (2). Put the mixed solution in a water bath and heat it in the water bath. The temperature of the water bath was 90 °C until the mixed solution became a clear solution. Stop heating, the mixed solution is gradually cooled to room temperature, and white flocculent precipitates gradually precipitate out of the solution. The obtained solution is suction filtered, and the obtained solid is placed in an oven for drying. The drying temperature is 90°C, and the holding time is 3h. , to obtain the boron nitride precursor.
[0058] (3). The obtained precursor was ...
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