Preparation method of SiC porous ceramic
A technology of porous ceramics and ceramic powders, which is applied in the field of SiC porous ceramics preparation, can solve the problems of difficult control of pore shape and low porosity of SiC porous ceramics, and achieve the effect of pollution-free effective control, low cost and uniform pores
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Embodiment 1
[0020] The steps of preparing SiC porous ceramics in this embodiment are as follows:
[0021] a. Weigh 7.5% Al by mass 2 o 3 As a sintering aid, 60% by mass of dark green nano-SiC powder (with a particle size range of 50-150nm) is used as a matrix material, and 30% by mass of PMMA powder is a pore-forming agent (with a particle size range of 20-40μm) , the mass percentage is 2.5% phenolic resin as binder;
[0022] b. First mix the dark green nano-SiC powder with Al 2 o 3 and phenolic resin in a ball mill for 8 to 12 hours, and then dry the mixed powder in an oven;
[0023] c. Add the mixed powder and PMMA micropowder in step b into the mixer, and mix for 10-30 minutes;
[0024] d. Press the powder mixed in step c into a blank with a dry press molding machine. The blank is placed in the air for 1 day, dried naturally, and then pretreated in an oven at 80°C for 5 hours, and then heated to 110°C for 10 hours. Obtain a dry green body;
[0025] e. Put the dried body in step ...
Embodiment 2
[0028] The present embodiment is different from Example 1 in that the weight percentage in step a is 2.5% Al 2 o 3 As a sintering aid, dark green nano-SiC powder (with a particle size range of 150-250nm) with a mass percentage of 62.5% is used as the matrix material, and PMMA powder (with a particle size range of 40-60μm). Other steps were the same as in Example 1, and the SiC porous ceramic obtained had a porosity of 34.8% and a flexural strength of 22.8 MPa.
Embodiment 3
[0030] The difference between this embodiment and embodiment 1 is that the weight percentage in step a is 5% Al 2 o 3 As a sintering aid, dark green nano-SiC powder (with a particle size range of 250-350nm) with a mass percentage of 57.5% is used as the matrix material, and PMMA powder (with a particle size range of 60-75μm). In step e, put the body into a high-temperature furnace, raise the temperature to 1400° C. at a rate of 8° C. / min, and keep the temperature for 2 hours. Other steps were the same as in Example 1, and the SiC porous ceramic obtained had a porosity of 35.8% and a flexural strength of 32.6MPa.
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