Method for preparing high-thermal-conductivity silicon nitride ceramics
A technology of silicon nitride ceramics with high thermal conductivity, applied in the field of functional ceramics, which can solve the problems of high sintering temperature, introduction of lattice oxygen atoms and equal grain boundaries, achieve low preparation temperature, achieve densification, and reduce the effect of subsequent processing
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[0028] Example 1: Select β-Si with a particle size of 1.2μm 3 N 4 Powder, at 1800℃, 0.3MPaN 2 Heat treatment in an atmosphere for 2 hours, and then use 5% HF acid to treat the heat-treated Si 3 N 4 The powder is pickled for 6 hours and dried for later use. Weigh 50g of processed Si 3 N 4 Powder, add 50g solvent, the solvent is anhydrous ethanol and methyl ethyl ketone mixed in a volume ratio of 1:1, 4g dispersant triethyl phosphate, put it into a nylon ball mill tank, then add silicon nitride grinding balls, on the drum ball mill Ball mill for 12 hours; then add 5g binder polyvinyl butyral, 5g plasticizer, plasticizer is glycerol and dioctyl phthalate in a volume ratio of 1:1 to mix and 4g Foaming agent, defoaming agent is n-butanol and ethylene glycol mixed in a volume ratio of 1:1; continue ball milling for 12 hours to obtain uniformly dispersed Si suitable for casting 3 N 4 Slurry. Cast the slurry to obtain a thickness of 0.4mm, Si 3 N 4 A thin layer with a volume fraction o...
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[0029] Example 2: Select β-Si with a diameter of about 1μm and an aspect ratio of about 5 3 N 4 Columnar crystal, at 1800℃, 0.3MPaN 2 Heat treatment in an atmosphere for 2 hours, and then use 5% HF acid to treat the heat-treated Si 3 N 4 The powder is pickled for 6 hours and dried for later use. Weigh 50g of processed Si 3 N 4 Powder, add 50g solvent, the solvent is anhydrous ethanol and methyl ethyl ketone mixed in a volume ratio of 1:1, 4g dispersant triethyl phosphate, put it into a nylon ball mill tank, add silicon nitride grinding balls, and ball mill on a drum ball mill 12 hours. Then add 5g of binder polyvinyl butyral, 5g of plasticizer to the ball mill tank. The plasticizer is glycerol and dioctyl phthalate mixed in a volume ratio of 1:1 and 4g of defoamer to eliminate The foaming agent is n-butanol and ethylene glycol mixed in a volume ratio of 1:1, and ball milling is continued for 12 hours to obtain Si that is uniformly dispersed and suitable for casting 3 N 4 Slurry...
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