Method for synthesizing ultra-fine aluminum nitride powder with combustion
A technology of ultra-fine aluminum nitride and combustion synthesis, applied in chemical instruments and methods, inorganic chemistry, aluminum compounds, etc., can solve problems such as poor product uniformity, long production cycle, and numerous processes, and achieve uniform products and short production cycle , Good product uniformity
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Embodiment 1
[0038] Based on the weight of aluminum powder, 39.5 parts by weight of raw aluminum powder, 60 parts by weight of aluminum nitride powder, and 0.5 parts by weight of NH 4 Cl(NH 4 Cl is a commercially available chemical) to obtain a mixture; the mixed powder is mechanically activated by a high-energy planetary ball mill, and after thorough mixing, the mixed raw material is 3 The loose packing density is put into the reaction material boat with aluminum foil inside, put the reaction material boat into the high-pressure reaction vessel, after vacuuming, fill it with nitrogen gas, so that the pressure is controlled at 5.0MPa; it is wound with Φ0.5mm tungsten wire The coil is fed with a pulse current of 10-30A for a duration of 5-10s to make the coil generate heat and heat the raw material layer in contact with it to reach the level of Al and N 2 The temperature at which the reaction occurs, and then turn off the pulse power supply, and the induced reaction will advance the combus...
Embodiment 2
[0040] Based on the weight of aluminum powder, 57 parts by weight of raw aluminum powder, 40 parts by weight of aluminum nitride powder, 3 parts by weight of NH 4 Cl(NH 4 Cl is a commercially available chemical) to obtain a mixture; the mixed powder is mechanically activated by a high-energy planetary ball mill, and after thorough mixing, the mixed raw material is 3 The bulk density is put into the reaction material boat covered with aluminum foil inside, and the reaction material boat is put into the high-pressure reaction vessel. After vacuuming, it is filled with nitrogen to control the pressure at 1.0MPa; it is wound with Φ0.5mm tungsten wire The coil is fed with a pulse current of 10-30A for 5-10s to heat the coil and heat the raw material layer in contact with it to reach the level of Al and N 2 The temperature at which the reaction occurs, and then turn off the pulse power supply, and the induced reaction will promote combustion layer by layer in a self-propagating man...
Embodiment 3
[0042] Based on the weight of aluminum powder, 39.5 parts by weight of raw aluminum powder, 60 parts by weight of aluminum nitride powder, and 0.5 parts by weight of NH 4 Cl(NH 4 Cl is a commercially available chemical) to obtain a mixture; the mixed powder is mechanically activated by grinding with a high-energy horizontal rotor, and after thorough mixing, the mixed raw material is 3 The loose packing density is put into the reaction material boat covered with aluminum foil inside, the reaction material boat is put into the high-pressure reaction vessel, and after vacuuming, it is filled with nitrogen and argon, so that the nitrogen pressure is controlled at 4.0MPa, and the argon pressure is controlled At 1.0MPa; the carbon paper is passed through a pulse current of 10-30A for a duration of 5-10s, so that the raw material layer in contact with the heating carbon paper induces Al and N 2 The temperature at which the reaction occurs, and then turn off the pulse power supply, a...
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Abstract
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