Preparation method of boron nitride crystal whisker
A technology of boron nitride and whiskers, which is applied in the field of preparation of boron nitride whiskers, can solve problems such as insufficient nitriding treatment, affecting the performance of boron nitride whiskers, and easy defects on the surface of whiskers, etc., to achieve performance excellent effect
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[0007] The method for preparing boron nitride whiskers of the present invention includes the following steps:
[0008] 1. Weigh the nitrogen compound and the boron compound at a molar ratio of 1:2 to 5, and prepare a mixed aqueous solution with a concentration of 0.5 to 1 mol / l;
[0009] 2. Put the mixed aqueous solution prepared in step 1 into a constant temperature water bath, and react at a temperature of 40-60°C for 12-24 hours to prepare a boron nitride whisker precursor;
[0010] 3. Put the boron nitride whisker precursor prepared in step 2 into a drying box and dry it at a temperature of 80-100°C for 12-24 hours.
[0011] 4. Put the boron nitride whisker precursor dried in step 3 into an alumina crucible, calcinate in the air at 300-350°C for 2 to 4 hours, and then cool naturally.
[0012] 5. Put the boron nitride whisker precursor prepared in step 4 into a graphite crucible, and calcinate for 12-24 hours in an ammonia atmosphere at 750-1000°C, and then cool naturally to obtain a...
Embodiment 1
[0022] 1. Weigh melamine and boric acid at a molar ratio of 1:5, and prepare a mixed aqueous solution with a concentration of 0.7 mol / l;
[0023] 2. Put the mixed aqueous solution prepared in step 1 into a constant temperature water bath, and react at a temperature of 50°C for 24 hours to prepare a boron nitride whisker precursor;
[0024] 3. Put the boron nitride whisker precursor prepared in step 2 into a drying box and dry it at a temperature of 90°C for 12 hours.
[0025] 4. Put the boron nitride whisker precursor dried in step 3 into an alumina crucible, calcined in air at 350°C for 3 hours, and then naturally cool.
[0026] 5. Put the boron nitride whisker precursor prepared in step 4 into a graphite crucible, calcined in an ammonia atmosphere at 800°C for 14 hours, and then naturally cool to obtain a primary nitrided boron nitride whisker.
[0027] 6. Put the primary nitrided boron nitride whiskers obtained in step 5 into a graphite crucible, calcined in a nitrogen atmosphere at ...
Embodiment 2
[0030] 1. Weigh ammonium chloride and borax at a molar ratio of 1:3, and prepare a mixed aqueous solution with a concentration of 0.6 mol / l;
[0031] 2. Put the mixed aqueous solution prepared in step 1 into a constant temperature water bath, and react at a temperature of 60°C for 20 hours to prepare a boron nitride whisker precursor;
[0032] 3. Put the boron nitride whisker precursor prepared in step 2 into a drying box and dry it at a temperature of 80°C for 12 hours.
[0033] 4. The boron nitride whisker precursor dried in step 3 is put into an alumina crucible, calcined in air at 350°C for 2 hours, and then naturally cooled.
[0034] 5. Put the boron nitride whisker precursor prepared in step 4 into a graphite crucible, calcined in an ammonia atmosphere at 850°C for 12 hours, and then naturally cool to obtain a primary nitrided boron nitride whisker.
[0035] 6. Put the primary nitrided boron nitride whiskers obtained in step 5 into a graphite crucible, calcined in a nitrogen atmos...
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