Method for preparing mullite porous ceramics by freeze-drying method
A technology of freeze-drying and porous ceramics, applied in the field of inorganic ceramic materials, can solve the problems of uneven distribution of voids and low strength of ceramic materials, and achieve the effects of reducing sintering shrinkage, high porosity, and good adsorption
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Embodiment 1
[0022] A method for preparing mullite porous ceramics by a freeze-drying method, comprising the following steps:
[0023] (1) Put the modified protein soil, α-alumina and sintering aid into an agate ball mill jar, and use a planetary ball mill to mill for 2 hours at 300 rpm to obtain a uniformly mixed powder;
[0024] (2) mixing the uniform powder with hydroxypropyl starch and water to prepare a ceramic slurry with a hydroxypropyl starch content of 6vol%;
[0025] (3) Pour the prepared ceramic slurry into a mold of a certain shape and cast it quickly (a cylindrical polytetrafluoroethylene mold with a height and inner diameter of 30mm and a wall thickness of 13mm), and vacuum degassing to remove the slurry Then put the sample in a low-temperature refrigerator to completely freeze the sample and demould;
[0026] (4) Put the sample into a vacuum freeze dryer with a temperature of -30°C and a vacuum of 10 Pa for 36 hours;
[0027] (5) Sintering and cooling to obtain mullite por...
Embodiment 2
[0033] A method for preparing mullite porous ceramics by a freeze-drying method, comprising the following steps:
[0034] (1) Put the modified protein soil, α-alumina and sintering aid into an agate ball mill jar, and use a planetary ball mill to mill for 2 hours at 300 rpm to obtain a uniformly mixed powder;
[0035] (2) mixing the uniform powder with hydroxypropyl starch and water to prepare a ceramic slurry with a hydroxypropyl starch content of 8vol%;
[0036] (3) Pour the prepared ceramic slurry into a mold of a certain shape and cast it quickly (a cylindrical polytetrafluoroethylene mold with a height and inner diameter of 30mm and a wall thickness of 13mm), and vacuum degassing to remove the slurry Then put the sample in a low-temperature refrigerator to completely freeze the sample and demould;
[0037] (4) Put the sample into a vacuum freeze dryer with a temperature of -30°C and a vacuum of 10 Pa for 36 hours;
[0038] (5) Sintering and cooling to obtain mullite por...
Embodiment 3
[0044] A method for preparing mullite porous ceramics by a freeze-drying method, comprising the following steps:
[0045] (1) Put the modified protein soil, α-alumina and sintering aid into an agate ball mill jar, and use a planetary ball mill to mill for 2 hours at 300 rpm to obtain a uniformly mixed powder;
[0046] (2) mixing the uniform powder with hydroxypropyl starch and water to prepare a ceramic slurry with a hydroxypropyl starch content of 10vol%;
[0047] (3) Quickly pour the prepared ceramic slurry into a mold of a certain shape and cast it into a mold (cylindrical polytetrafluoroethylene mold with a height and inner diameter of 30mm and a wall thickness of 13mm), and vacuum degassing to remove the slurry Air bubbles in the material, and then put the sample in a low-temperature refrigerator to completely freeze the sample and demould;
[0048] (4) Put the sample into a vacuum freeze dryer with a temperature of -30°C and a vacuum of 10 Pa for 36 hours;
[0049] (5) S...
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