Method for preparing porous silicon-nitride ceramic material
A silicon nitride ceramic and silicon nitride technology, applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of high open porosity and low density, and achieve the effect of low density and high open porosity
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[0030] Example 1
[0031] a) 8g starch and 75g deionized water are vigorously stirred at 70°C for 10 minutes to absorb water and swell to prepare pregelatinized starch;
[0032] b) Transfer the prepared pre-gelatinized starch to the ball mill, and then add 50g silicon nitride, 2.5g sintering aid yttrium oxide, 2g binder polyvinyl alcohol and 1g defoamer n-octanol to the ball mill In the tank, ball milling makes the mixing uniform to obtain a mixed slurry;
[0033] c) Pouring the mixed slurry prepared in step b) into a shape, and then put it in a vacuum drying oven at room temperature below 100 Pa and vacuum degassing for 15 minutes to eliminate bubbles in the slurry; then seal the sample into an oven at 85°C Internal solidification for 30 minutes. After cooling to room temperature, the sample is placed in a low temperature refrigerator at -30°C for 24 hours to completely freeze the sample; the frozen sample is quickly transferred to a freeze dryer at 5°C and 10Pa Freeze-drying for ...
Example Embodiment
[0039] Example 2
[0040] a) 8g starch and 70g deionized water are vigorously stirred at 90°C for 5 minutes to absorb water and swell to prepare pregelatinized starch;
[0041] b) Transfer the prepared pre-gelatinized starch to the ball mill, and then add 50g of silicon nitride, 2g of sintering aid yttrium oxide, 2g of binder polyvinyl alcohol and 1.2g of defoamer n-octanol to the ball mill In the tank, ball milling makes the mixing uniform to obtain a mixed slurry;
[0042] c) Pouring the mixed slurry prepared in step b) into a shape, and then put it in a vacuum drying oven at room temperature below 100 Pa and vacuum degassing for 20 minutes to eliminate bubbles in the slurry; then seal the sample into an oven at 70°C Internal solidification for 60 minutes. After cooling to room temperature, place the sample in a low-temperature refrigerator at -30°C for 24 hours to completely freeze the sample; quickly transfer the frozen sample to a freeze dryer at 7°C and 20Pa Freeze-drying for...
Example Embodiment
[0046] Example 3
[0047] a) Stir 5g starch and 60g deionized water vigorously at 70°C for 10 minutes to absorb water and swell to prepare pregelatinized starch;
[0048] b) Transfer the prepared pre-gelatinized starch to a ball milling tank, and then add 50 g of silicon nitride, 2.5 g of sintering aid yttrium oxide, 0 g of binder polyvinyl alcohol and 0.8 g of defoamer n-octanol to In the ball mill tank, the ball mill makes the mixing uniform to prepare a mixed slurry;
[0049] c) The mixed slurry prepared in step b) is poured into a shape, and then placed in a vacuum drying oven at room temperature below 100 Pa and vacuum degassed for 20 minutes to eliminate bubbles in the slurry; then the sample is sealed and placed in a 70°C oven It is internally cured for 60 minutes. After cooling to room temperature, the sample is placed in a low-temperature refrigerator at -30°C for 24 hours to completely freeze the sample; the frozen sample is quickly transferred to a freeze dryer at 4°C and...
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