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1. Chemical Engineering English Translation
Annealing at 800? Under a nitrogen atmosphere, a yellow colored powder is obtained as an intermediate product of BNO, which may have the following formula B4N3O2H [11a]. The yellow powder was further calibrated in air at 600 ° C for 2 hours to obtain more oxygen in the white BNO product. The prepared British National (Overseas) precursor is put into a large graphite crucible. Aluminum chloride is placed in a small BN crucible above the crucible. These components are enclosed in graphite suspension receptors and heated in an induction furnace. Then evacuate the furnace and introduce a pure Ar gas stream. Heating the furnace step by step. When the gas flow rate at a temperature of about 950 ℃ C is switched to: pure NH3/N2 (N2 100 mL/min ± 1, ammonia nitrogen 200 mL/min ± 1). Afterwards, raise the temperature and maintain it at 1200 C for approximately 1.2 hours. Then increase the temperature further. Adjustment of position sensor for British National (Overseas) precursor in Daxiang Zhengque graphite crucible to ensure heating of BNO precursor mixture at C. 1600? The atmosphere is that the flow of N2/NH3 has the same velocity, as in the first stage. After about an hour of preparation, coaxial tubular single-crystal cubic aluminum nitride nanotubes were coated with a BN coating. The X-ray diffractometer (2200HF RINT) and high-resolution transmission field emission electron microscope (HRTEM) (JEM-3000F) on the product are connected to an X-ray energy dispersive spectrometer (EDS) for inspection.
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