Silicon carbide whisker reinforced porous periclase-spinel-carbon filter and preparation method thereof
A silicon carbide whisker and periclase technology, applied in ceramic products, manufacturing tools, casting equipment, etc., can solve problems such as poor thermal shock stability, short service life, and poor effect of removing inclusions, so as to increase strength and improve Strength and thermal shock stability, effect of improving thermal shock stability
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[0062] Step 3, preparation of silicon carbide preform
[0063] According to the mass ratio of cyclohexane: allylhydrogenpolycarbosilane (2-12): 1, the cyclohexane and the allylhydrogenpolycarbosilane are placed in a stirrer and stirred for 5-10min, Then add a platinum complex solution accounting for the mass of the cyclohexane and the allylhydropolycarbosilane and 0.08-0.14 wt%, stir for 5-10 minutes, and turn off the mixer to obtain a mixed solution.
[0064] Then impregnate the polyurethane foam template in the mixed solution, take it out and squeeze it manually, repeat the dipping-manual extrusion process for 2 to 5 times; after taking it out, place it at room temperature for 24 to 36 hours, and place it at 1100 to 1300 ° C under a nitrogen atmosphere Keep it warm for 1-2 hours, and cool to room temperature to obtain a silicon carbide preform.
[0065] Step 4. Preparation of silicon carbide whisker reinforced porous periclase-spinel-carbon filter
[0066] Using 89-97wt% o...
Embodiment 1
[0089] A silicon carbide whisker reinforced porous periclase-spinel-carbon filter and a preparation method thereof. The steps of the preparation method described in this specific embodiment are:
[0090] Step 1, preparation of porous periclase-spinel ceramic fine powder
[0091] Step 1.1. Heat the aluminum hydroxide fine powder to 370° C. at a rate of 2.5° C. / min, keep it warm for 1 hour, and cool to obtain alumina fine powder with high porosity.
[0092] Step 1.2: Stir 40wt% of the high-porosity alumina fine powder and 75wt% light-burned magnesite fine powder in a mixer for 3 hours to obtain a mixture I.
[0093] Step 1.3. According to the mass ratio of the mixture I: aluminum sol is 100:6, mix the mixture I and the aluminum sol for 13 minutes to obtain the mixture II. The mixture II was machine-pressed at 135 MPa, dried at 110°C for 36 hours, heated to 1750°C at a rate of 5°C / min, and kept for 6 hours to obtain porous periclase-spinel with micro-nano pores Ceramic materia...
Embodiment 2
[0119] A silicon carbide whisker reinforced porous periclase-spinel-carbon filter and a preparation method thereof. The steps of the preparation method described in this specific embodiment are:
[0120] Step 1, preparation of porous periclase-spinel ceramic fine powder
[0121] Step 1.1. Heat up the aluminum hydroxide fine powder to 390° C. at a rate of 2° C. / min, keep it warm for 3 hours, and cool to obtain alumina fine powder with high porosity.
[0122] Step 1.2: Stir 10 wt% of the high-porosity alumina fine powder and 90 wt% light-burned magnesite fine powder in a mixer for 1 hour to obtain a mixture I.
[0123] Step 1.3. According to the mass ratio of the mixture I: aluminum sol is 100:4, mix the mixture I and the aluminum sol for 18 minutes to obtain the mixture II. The mixture II was machine-pressed at 100 MPa, dried at 110°C for 18 hours, heated to 1720°C at a rate of 4°C / min, and kept for 2 hours to obtain porous periclase-spinel with micro-nano pores Ceramic mate...
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