Boron nitride nanosheet powder and its low-cost batch preparation method
A nanosheet, boron nitride technology, applied in the direction of nitrogen-metal/silicon/boron binary compounds, can solve the problems of long production cycle, low cost, complex process, etc., and achieve the effect of simple process and low cost
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[0023] A low-cost batch preparation method of boron nitride nanosheet powder provided by an aspect of the embodiments of the present invention includes: heating the boron source to 1000-1500°C in a nitrogen-containing reaction atmosphere and keeping it warm for reaction, and then heating the boron source in a protective atmosphere The temperature is lowered to room temperature to obtain a crude product, and the crude product is post-treated to obtain a boron nitride nanosheet powder; the boron source is selected from borates containing metal elements.
[0024] Further, the boron source may be selected from borates containing at least one element of lithium, beryllium, magnesium, calcium, strontium, barium, aluminum, gallium, indium, zinc, and titanium. For example, the boron source may preferably be selected from calcium borate (CaB 4 o 7 , Ca 2 B 2 o 5 , Ca 3 B 2 o 6 ), magnesium borate (MgB 4 o 7 , MgB 2 o 5 , Mg 3 B 2 o 6 ), lithium borate (Li 2 B 4 o 7 ) a...
Embodiment 1
[0049] Embodiment 1 takes CaB 4 o 7 2g was filled in an open alumina crucible, then placed in a tube furnace, and evacuated to 10 - 3 Pa, 200 standard milliliters per minute (sccm) of NH 3 , heating up to 1250°C. Turn off NH after 180min constant temperature reaction at 1250°C 3 , into 200sccm N 2 , at N 2 The temperature was cooled to room temperature in the atmosphere, and the crude product was obtained. Then the obtained product is washed with ultrasonic water for 5 hours, filtered and dried to obtain boron nitride nanosheet powder with a purity of more than 99%. In this example, 95% yield of the target product can be obtained. figure 1 The photo of the crude product of the obtained BN nanosheets prepared in this example. figure 2 The TEM image of the BNNS powder obtained in this example shows that its size is in the order of microns.
Embodiment 2
[0050] Embodiment 2 gets Mg 2 B 2 o 5 2g was placed in an open alumina crucible, and then placed in a tube furnace. The furnace tube was purged of air by blowing 1000 standard milliliters per minute (sccm) of Ar. Then 200sccm Ar and 200sccm NH 3 The temperature was raised to 1300°C. Turn off the NH after reacting at a constant temperature of 1300°C for 4h 3 , 500 sccm of Ar was introduced to cool down to room temperature, and the crucible was taken out to obtain a crude product. Then the obtained product is ultrasonically pickled with 3 mol / L nitric acid for 1 h, filtered and dried to obtain boron nitride nanosheet powder with a purity of more than 99%. In this example, 85% of the target product yield can be obtained. image 3 This is the SEM image of the BN nanosheets obtained in this example, and scaly BN nanosheets can be observed. Figure 4 The XRD pattern of the BNNS obtained in this example confirms that the obtained product is a single-phase hexagonal BN. Fig...
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