Preparation method of superlight closed-pore ceramic
An ultra-light, closed-cell technology, applied in the field of foam ceramics preparation, can solve the problems of difficult control of foam stability, and achieve the effects of saving glue removal process, low density and low raw material cost
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[0016] Example 1: Preparation of alumina ultra-light closed-cell ceramic foam
[0017] Select 10% of alumina particles, mix with 90% water, and obtain alumina slurry after ball milling for 20 hours. Add 0.01% of anionic surfactant and stir at high speed (1500rpm). The obtained particle-stabilized foam slurry was dried in the air for 24 hours, and then sintered in an air atmosphere at 1550°C for 2.5 hours. The density of the foam ceramic obtained is 0.2g / cm 3 , The closed porosity is 90%, the pore diameter is 50μm, and it is uniformly distributed in the ceramic sintered body.
Example Embodiment
[0018] Example 2: Preparation of ultra-light closed-cell silicon nitride ceramics
[0019] 30% of silicon nitride particles are selected, mixed with 70% water, and ball milled for 20 hours to obtain silicon nitride slurry. Add 1% Triton and stir at high speed (1500 rpm). The obtained particle-stabilized foam was dried in air for 24 hours, and then sintered in a nitrogen atmosphere at 1790°C for 1.8 hours. The density of the foam ceramic obtained is 0.7g / cm 3 , The closed porosity is 80%, the pore diameter is 80μm, and it is uniformly distributed in the ceramic sintered body.
Example Embodiment
[0020] Example 3: Preparation of zirconia closed-cell ultralight ceramics
[0021] Select 50% zirconia particles, mix them with 50% water, and obtain zirconia slurry after ball milling for 10 hours. Add 5% cetyltrimethylammonium bromide and stir at high speed (1500rpm). The obtained particle-stabilized foam was dried in air for 24 hours, and then sintered in a nitrogen atmosphere at 1770 degrees for 2 hours. The density of the foam ceramic obtained is 0.2g / cm 3 , The closed porosity is 90%, the pore diameter is 50μm, and it is evenly distributed in the ceramic sintered body.
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