Method for preparing powder material of silicon nitride under low temperature
A technology of silicon nitride powder and bulk materials, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc., can solve the problems of low purity, long reaction time, affecting applications, etc., and achieve good chemical stability and high temperature strength Effect
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Embodiment 1
[0017] by SiCl 4 with NaN 3 The chemical exchange reaction between Si 3 N 4 Powder. In an anhydrous and oxygen-free glove box, weigh 7.5g NaN with a balance 3 , use a pipette to measure 3.0ml SiCl 4 , Moved into a 50ml reaction kettle. After sealing the kettle, the reaction kettle was heated to 100°C in a heating furnace, and the heating was stopped after reaching 100°C. The reaction product was washed with absolute alcohol until the filtrate was colorless, then washed with boiling sodium hydroxide, and finally washed with deionized water until the filtrate was neutral, and then the product was dried at 60°C for 3 hours to obtain 1.36g of off-white powder .
Embodiment 2
[0019] by SiCl 4 with NaN 3 The chemical exchange reaction between Si 3 N 4 Powder. In an anhydrous and oxygen-free glove box, weigh 7.5g NaN with a balance 3 , use a pipette to measure 3.0ml SiCl 4 , Moved into a 50ml reaction kettle. After sealing the kettle, the reaction kettle was heated to 300°C in a heating furnace, and the heating was stopped after reaching 300°C. The reaction product was washed with absolute alcohol until the filtrate was colorless, then washed with boiling sodium hydroxide, and finally washed with deionized water until the filtrate was neutral, and then the product was dried at 60°C for 3 hours to obtain 1.44g of off-white powder .
Embodiment 3
[0021] by SiCl 4 with NaN 3 The chemical exchange reaction between Si 3 N 4 Powder. In an anhydrous and oxygen-free glove box, weigh 7.5g NaN with a balance 3 , use a pipette to measure 3.0ml SiCl 4 , Moved into a 50ml reaction kettle. After sealing the kettle, the reaction kettle was heated to 480°C in a heating furnace, and the heating was stopped after reaching 480°C. The reaction product was washed with absolute alcohol until the filtrate was colorless, then washed with boiling sodium hydroxide, and finally washed with deionized water until the filtrate was neutral, and then the product was dried at 60°C for 3 hours to obtain 1.44g of off-white powder .
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