A preparation method of three-dimensional network porous ceramics presenting pore size gradient distribution
A gradient distribution, three-dimensional network technology, applied in the field of materials science, can solve the problems of difficult to prepare three-dimensional network porous ceramics, complex porous ceramics process, etc., and achieve the effects of low cost, adjustable porosity, and easy industrialization.
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Embodiment 1
[0026] A method for preparing a three-dimensional network porous ceramic exhibiting a gradient distribution of pore size, specifically includes the following steps:
[0027] (1) Slurry preparation
[0028] Raw material (mass ratio): SiC 86.8, Al 2 O 3 10. Carboxymethyl cellulose 0.3, polyvinyl alcohol 2, polyacrylic acid 0.5, acetone 0.2.
[0029] Pour the weighed raw materials into a stirred tank, add 43 mL of deionized water, and prepare a slurry with a solid content of about 70%. Put the stirring kettle into a 60°C water bath and stir for 1 hour, the slurry viscosity is 16Pa·S.
[0030] (2) Hanging slurry
[0031] Choose 20PPI polyurethane foam, coat the prepared slurry evenly on the surface of the polyurethane foam, properly squeeze the foam to make the slurry enter the foam, and then use an electric air pump to blow air against the surface coated with the slurry. The distance between the blowing port and the surface is 3cm, and the wind speed is 8m / s. As the slurry gradually ent...
Embodiment 2
[0037] A method for preparing a three-dimensional network porous ceramic exhibiting a gradient distribution of pore size, specifically includes the following steps:
[0038] Raw materials used (mass ratio): SiC 8.17, MgO 4.2, TiO 2 10.8, carboxymethyl cellulose 0.2, polyetherimide 0.3, polyacrylic acid 2, butanone 0.2, pour into a stirred tank, add 54mL of deionized water, put the stirred tank in a 60℃ water bath and stir for 1h , Formulated into a slurry with a solid content of 65%. The slurry viscosity is 18Pa·S. Use 30PPI polyurethane foam to hang the slurry once. The distance between the blowing port and the surface is 1cm, and the wind speed is 10m / s. When the blowing port is 10cm from the surface, the wind speed is reduced to 5m / s. Naturally dry and oxidize at room temperature for 6 hours. Prepare a secondary slurry with a solid content of 60% according to the original raw material ratio, and the slurry viscosity is 0.8Pa·S. The SiC green body after the second sizing is...
Embodiment 3
[0040] A method for preparing a three-dimensional network porous ceramic exhibiting a gradient distribution of pore size, specifically includes the following steps:
[0041] Raw materials used (mass ratio): SiC 88.5, Y 2 O 3 2.85, Al 2 O 3 2.15, polyetherimide 0.5, silica sol 5, ammonium citrate 1, ethylene glycol 0.01, mixed into a slurry with a solid content of 65%. The slurry viscosity is 20Pa·S. Use 10PPI polyurethane foam, and dry and oxidize the body after one time at room temperature for 8 hours. The solid content of the secondary slurry is 50%, and the viscosity of the slurry is 0.2Pa·S. The second slurried, room temperature dried green body was kept at 1450°C for 2 hours, and the others were as in Example 2. After sintering, the pore thickness gradient of the ceramic is gradually changed from 0.4mm to 2.2mm. The porosity of the three-dimensional network SiC ceramics is 72% and the compressive strength is 3.2MPa.
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