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SILICON NITRIDE, CERAMIC SLURRY AND PREPARATION METHOD
Disclosed is a silicon nitride powder, a preparation method thereof, a ceramic slurry containing the silicon nitride powder and a preparation method thereof. The surface area ratio of non-oxidized silicon nitride of the silicon nitride powder with respect to the total silicon nitride surface area is 0.40-0.85. The ceramic slurry comprises the silicon nitride powder, a sintering aid, and an organic component having a hydroxyl group, a carboxyl group, an amino group, an ester group, an aldehyde group, a carbonyl group, and other groups. The preparation method of the ceramic slurry comprises: (1) preparing silicon nitride primary powder via a temperature-controlled activation combustion synthesis method; (2) coarse screening the silicon nitride primary powder and acid-washing the same with an acid mixture of nitric acid, hydrochloric acid and sulfuric acid, followed by washing with water, suction filtering and drying; (3) placing the powder obtained from step 2 in a heating device and heat-treating the same under a flowing nitrogen atmosphere to remove additives; and (4) mixing the powder obtained from step 3 with a fluid, followed by grinding in a grinder and then sieving to obtain the product.
SILICON NITRIDE, CERAMIC SLURRY AND PREPARATION METHOD
Disclosed is a silicon nitride powder, a preparation method thereof, a ceramic slurry containing the silicon nitride powder and a preparation method thereof. The surface area ratio of non-oxidized silicon nitride of the silicon nitride powder with respect to the total silicon nitride surface area is 0.40-0.85. The ceramic slurry comprises the silicon nitride powder, a sintering aid, and an organic component having a hydroxyl group, a carboxyl group, an amino group, an ester group, an aldehyde group, a carbonyl group, and other groups. The preparation method of the ceramic slurry comprises: (1) preparing silicon nitride primary powder via a temperature-controlled activation combustion synthesis method; (2) coarse screening the silicon nitride primary powder and acid-washing the same with an acid mixture of nitric acid, hydrochloric acid and sulfuric acid, followed by washing with water, suction filtering and drying; (3) placing the powder obtained from step 2 in a heating device and heat-treating the same under a flowing nitrogen atmosphere to remove additives; and (4) mixing the powder obtained from step 3 with a fluid, followed by grinding in a grinder and then sieving to obtain the product.
SILICON NITRIDE, CERAMIC SLURRY AND PREPARATION METHOD
SILIZIUMNITRID, KERAMISCHER SCHLICKER UND VERFAHREN ZUR HERSTELLUNG
NITRURE DE SILICIUM, SUSPENSION CÉRAMIQUE ET PROCÉDÉ DE PRÉPARATION
CUI WEI (author) / CHENG HUIMING (author) / ZOU YIFENG (author) / LI FEI (author) / ZHANG JIE (author)
2022-04-06
Patent
Electronic Resource
English
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