Aluminum nitride powder purification method
A purification method and aluminum nitride technology, which is applied in the field of materials, can solve problems such as poor purification effect of aluminum nitride powder, and achieve the effects of low raw material cost, simple preparation method, and uniform particle size distribution
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Embodiment 1
[0024] A method for purifying aluminum nitride powder, comprising the following steps:
[0025] Step S10, mix 20g of aluminum nitride powder with 0.16g of sodium azide, grind and mix thoroughly to obtain a premixed powder; the NaN of the above-mentioned sodium azide 3 Content≥99.0wt%, particle size≤0.15mm;
[0026] Step S20, put the premixed powder into the crucible, use the reducing gas nitrogen to perform high-temperature air washing treatment on the furnace body, then put the crucible into the furnace body, use high-purity nitrogen to purge the furnace body, then vacuumize the furnace body to 20KPa, and heat up to 490°C, heat preservation at a heating rate of 2.8°C / min for 3 hours, and then naturally cool to room temperature to obtain a mixed powder;
[0027] Step S30, put the mixed powder into a dry beaker, wash it with a cleaning solution for 4 times, filter it with suction, and dry it in a vacuum drying room; the above cleaning solution is composed of 100 parts of absol...
Embodiment 2
[0030] A method for purifying aluminum nitride powder, comprising the following steps:
[0031] Step S10, mix 20g of aluminum nitride powder with 0.08g of sodium azide, grind and mix thoroughly to obtain a premixed powder; the NaN of the above-mentioned sodium azide 3 Content≥99.0wt%, particle size≤0.15mm;
[0032] Step S20, put the premixed powder into the crucible, use the reducing gas nitrogen to perform high-temperature air washing treatment on the furnace body, then put the crucible into the furnace body, use high-purity nitrogen to purge the furnace body, then vacuumize the furnace body to 20KPa, and heat up to 425°C, heat preservation at a heating rate of 2°C / min for 2 hours, and then naturally cool to room temperature to obtain a mixed powder;
[0033] Step S30, put the mixed powder in a dry beaker, wash it with cleaning solution for 3 times, filter it with suction, and dry it in a vacuum drying room; the above cleaning solution is composed of 100 parts of absolute et...
Embodiment 3
[0036] A method for purifying aluminum nitride powder, comprising the following steps:
[0037] Step S10, mix 20g of aluminum nitride powder with 0.24g of sodium azide, grind and mix thoroughly to obtain a premixed powder; the NaN of the above-mentioned sodium azide 3 Content≥99.0wt%, particle size≤0.15mm;
[0038] Step S20, put the premixed powder into the crucible, use the reducing gas nitrogen to perform high-temperature air washing treatment on the furnace body, then put the crucible into the furnace body, use high-purity nitrogen to purge the furnace body, then vacuumize the furnace body to 20KPa, and heat up to 560°C, heat preservation at a heating rate of 3.5°C / min for 4 hours, and then naturally cool to room temperature to obtain a mixed powder;
[0039] Step S30, put the mixed powder in a dry beaker, wash it with a cleaning solution for 5 times, filter it with suction, and dry it in a vacuum drying room; the cleaning solution is composed of 100 parts of absolute etha...
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