Method for preparing silicon nitride by using recovery purification silicon wafer sawdust powder
A technology of silicon nitride and sawdust, which is applied in the field of preparing silicon nitride, can solve the problem of high consumption of additional silicon materials and achieve the effect of reducing costs
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[0022] Example 1
[0023] The silicon sawdust powder separated and extracted from the waste mortar discharged when the silicon wafer is cut by the SiC abrasive mortar wire saw is used as the raw material. The ICP-AES (plasma coupled atomic spectrometer) analysis results of the main impurities are listed in Table 1.
[0024] Take 100 grams of the raw material powder and place it in a rotatable corundum tube resistance furnace. Infuse ammonia gas. The temperature is raised to 600°C for 1 hour; then the temperature is raised to 1100°C for 1 hour. During the heat preservation process, the corundum tube Keep rotating at a speed of 3 revolutions per minute, and then cool to room temperature with the furnace; then heat up to 1250°C, keep the temperature for 2 hours, and then cool to room temperature with the furnace and take it out.
[0025] The product was measured by X-ray powder diffractometer as pure silicon nitride (Si 3 N 4 ), where α-Si 3 N 4 The ratio is 92%v.
[0026] Table 1 ICP-AE...
Example Embodiment
[0028] Example 2
[0029] The silicon sawdust powder separated and extracted from the waste mortar discharged when the silicon wafer is cut by the SiC abrasive mortar wire saw is used as the raw material. The ICP-AES (plasma coupled atomic spectrometer) analysis results of the main impurities are listed in Table 1.
[0030] Take 100 grams of the raw material powder and place it in a rotatable corundum tube resistance furnace. Fill it with nitrogen, heat it up to 800°C and keep it for 3 hours; then heat it up to 1100°C and keep it for 2 hours. The corundum tube Keep rotating at a speed of 5 minutes per minute, and then cool to room temperature with the furnace; then take the obtained furnace product powder and heat it up to 1350°C in another corundum tube furnace for 4 hours, and then cool to room temperature with the furnace and leave the furnace.
[0031] The product was measured by X-ray powder diffractometer as pure silicon nitride (Si 3 N 4 ), where α-Si 3 N 4 The ratio is 91%v. ...
Example Embodiment
[0032] Example 3
[0033] The silicon sawdust powder separated and extracted from the waste mortar discharged when the silicon wafer is cut by the SiC abrasive mortar wire saw is used as the raw material. The ICP-AES (plasma coupled atomic spectrometer) analysis results of the main impurities are listed in Table 1.
[0034] Take 100 grams of the raw material powder and place it in a rotatable corundum tube-type resistance furnace. Fill in the nitrogen-hydrogen mixture and heat up to 1000°C for 6 hours; then heat up to 1200°C for 6 hours. The corundum tube is kept rotating at a speed of 30 revolutions per minute, and then cooled to room temperature with the furnace; then, the temperature is raised to 1380°C, and the temperature is kept for 8 hours.
[0035] The product was measured by X-ray powder diffractometer as pure silicon nitride (Si 3 N 4 ), where α-Si 3 N 4 The ratio is 95%v.
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