A method for preparing porous ceramics by gel casting combined with freeze-drying
A technology of porous ceramics and gels, applied in ceramic products, ceramic molding machines, manufacturing tools, etc., can solve the problems of difficult control of ice crystal growth, increased difficulty of preparation, and damage to the uniformity of microstructure, and achieve microscopic morphology and mechanical properties. Good performance, the effect of inhibiting the growth of ice crystals
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Embodiment 1
[0038] (1) 32.33g of water and 0.1g of water-soluble isobutylene polymer are stirred and mixed to form an aqueous solution;
[0039] (2) above-mentioned aqueous solution is transferred in the ball mill jar, then to ball mill jar, add the silicon nitride ball of 100g, 1.5g yttrium oxide powder, 1.5g aluminum oxide powder and 47g silicon nitride powder body, ball mill rotating speed is 300r / min, After ball milling for 2.5 hours, a uniformly mixed water-based slurry was obtained;
[0040] (3) The slurry is vacuum degassed, then injected into a metal mold, and then the mold is sealed. After sealing for 12 hours at 30°C, the mold is transferred to liquid nitrogen (the temperature is -196°C), frozen for 5min, Obtain solidified green body;
[0041] (4) Transfer the molded ceramic body to a freeze dryer, the freeze drying conditions are vacuum degree 1Pa, condensation chamber -68°C, heating plate 60°C, and dry for 48 hours;
[0042] (5) Raise the ceramic green body to 600°C at 5°C / m...
Embodiment 2
[0045] (1) 32.33g of water and 0.1g of water-soluble isobutylene polymer are stirred and mixed to form an aqueous solution;
[0046] (2) above-mentioned aqueous solution is transferred in the ball mill jar, then to ball mill jar, add the silicon nitride ball of 100g, 1.5g yttrium oxide powder, 1.5g aluminum oxide powder and 47g silicon nitride powder body, ball mill rotating speed is 300r / min, After ball milling for 2.5 hours, a uniformly mixed water-based slurry was obtained;
[0047] (3) The slurry is vacuum degassed, then injected into a metal mold, and then the mold is sealed, and after sealing for 24 hours at 25° C., the mold is transferred to liquid nitrogen, and frozen for 5 minutes to obtain a solidified green body;
[0048] (4) Transfer the molded ceramic body to a freeze dryer, the freeze drying conditions are vacuum degree 1Pa, condensation chamber -68°C, heating plate 60°C, and dry for 48 hours;
[0049] (5) Raise the ceramic green body to 600°C at 5°C / min under a...
Embodiment 3
[0052] (1) 32.33g of water and 0.1g of water-soluble isobutylene polymer are stirred and mixed to form an aqueous solution;
[0053] (2) above-mentioned aqueous solution is transferred in the ball mill jar, then to ball mill jar, add the silicon nitride ball of 100g, 1.5g yttrium oxide powder, 1.5g aluminum oxide powder and 47g silicon nitride powder body, ball mill rotating speed is 300r / min, After ball milling for 2.5 hours, a uniformly mixed water-based slurry was obtained;
[0054] (3) The slurry is vacuum degassed, then injected into a metal mold, and then the mold is sealed, and after sealing for 36 hours at 25° C., the mold is transferred to liquid nitrogen, and frozen for 5 minutes to obtain a solidified green body;
[0055] (4) Transfer the molded ceramic body to a freeze dryer, the freeze drying conditions are vacuum degree 1Pa, condensation chamber -68°C, heating plate 60°C, and dry for 48 hours;
[0056] (5) Raise the ceramic green body to 600°C at 5°C / min under a...
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