A preparing method of a three dimensional network porous ceramic with pore diameters in graded distribution
A gradient distribution and three-dimensional network technology, applied in the field of materials science, can solve the problems of complex porous ceramic technology and difficulty in preparing three-dimensional network porous ceramics, 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 presenting a pore size gradient distribution, specifically comprising the following steps:
[0027] (1) Slurry preparation
[0028] Raw materials (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 43mL of deionized water, and make a slurry with a solid content of about 70%. Put the stirred tank into a water bath at 60°C and stir for 1 h, and the viscosity of the slurry is 16 Pa·S.
[0030] (2) Slurry
[0031] Select 20PPI polyurethane foam, apply the prepared slurry evenly on the surface of the polyurethane foam, squeeze the foam properly to make the slurry enter the inside of the foam, and then use an electric air pump to blow air on 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 ...
Embodiment 2
[0037] A method for preparing a three-dimensional network porous ceramic presenting a pore size gradient distribution, specifically comprising the following steps:
[0038]Raw materials (mass ratio): SiC 8.17, MgO 4.2, TiO 2 10.8, carboxymethyl cellulose 0.2, polyetherimide 0.3, polyacrylic acid 2, methyl ethyl ketone 0.2, pour into a stirring tank, add 54mL of deionized water, put the stirring tank in a water bath at 60°C and stir for 1h , dubbed into a slurry with a solid content of 65%. The slurry viscosity is 18Pa·S. Select 30PPI polyurethane foam, carry out slurrying once, the distance between the blowing port and the surface is 1cm, and the wind speed is 10m / s, when the distance between the blowing port and the surface is 10cm, the wind speed is reduced to 5m / s, and the slurry is finished. Dry and oxidize naturally at room temperature for 6h. Prepare the secondary hanging slurry with a solid content of 60% according to the original raw material ratio, and the viscosi...
Embodiment 3
[0040] A method for preparing a three-dimensional network porous ceramic presenting a pore size gradient distribution, specifically comprising the following steps:
[0041] Raw material (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, make a slurry with a solid content of 65%. The slurry viscosity is 20 Pa·S. Select 10PPI polyurethane foam, and dry and oxidize the green body after the primary slurrying at room temperature for 8 hours. The solid content of the slurry for secondary slurrying is 50%, and the slurry viscosity is 0.2Pa·S. The second slurrying and room temperature drying green body was kept at 1450° C. for 2 hours, and the others were as in Example 2. After sintering, the pore-strut thickness gradient of ceramics gradually changes between 0.4mm and 2.2mm. The porosity of the three-dimensional network SiC ceramics is 72%, and the compressive strength is 3.2MPa.
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