Aluminum oxide short-fiber enhanced magnesium-oxide-based foam ceramic filter and preparation method thereof
A ceramic foam and magnesia-based technology, applied in the filtration and purification of aluminum and its alloy melts, magnesia-based ceramic foam filter and its preparation, alumina short fiber reinforced magnesia-based ceramic foam filter and its preparation , which can solve the problems of operation limitation, increase matrix magnesium oxide lattice distortion, respiratory system and skin damage, etc., and achieve good strength, simple process and high efficiency
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Embodiment 1
[0052] According to the ratio of nano-titanium oxide accounting for 1% of the mass of the ceramic powder and commercial alumina short fibers (about 10 μm to 20 μm in diameter and 50 μm to 100 μm in length) accounting for 1% of the mass of the ceramic powder, the particle size was weighed to be 30 nm. Nano-titanium oxide, commercial alumina short fibers and a particle size of 250 mesh (middle diameter d 50 Prepare ceramic powder for lightly burned magnesia powder with a thickness of 58 μm; mix and prepare a rheological agent according to the mass ratio of polyvinyl butyral and hydroxypropyl methylcellulose at a ratio of 1:1.
[0053] According to mass percentage, 15% of nano-alumina sol with a solid content of 20% (select a commercial nano-alumina sol with a nearly neutral pH value, the same below), 0.8% of rheological agent, and the rest are ceramic powders for batching. First, add the light-burned magnesia powder into the ball mill tank according to the ratio, and add nano-al...
Embodiment 2
[0057] According to the ratio that nano-titanium oxide accounts for 2% of the mass of the ceramic powder, and alumina short fibers account for 3% of the mass of the ceramic powder, the nano-titanium oxide with a particle size of 60nm, commercial alumina short fibers and a particle size of 60nm are weighed. 500 mesh (middle diameter d 50Prepare ceramic powder for lightly burned magnesia powder (25 μm); mix and prepare rheological agent according to the mass ratio of polyvinyl butyral and hydroxypropyl methylcellulose at a ratio of 1:1.
[0058] According to mass percentage, 20% of nano-alumina sol with a solid content of 25%, 1.5% of rheological agent, and the rest are ceramic powder for batching. First, add the light-burned magnesia powder into the ball mill tank according to the proportion, mix the nano-alumina sol, nano-titanium dioxide, alumina short fiber, rheological agent and an appropriate amount of absolute ethanol and ultrasonically treat it for 60 minutes to make the...
Embodiment 3
[0062] According to the ratio that nano-titanium oxide accounts for 1.5% of the ceramic powder mass, and alumina short fibers account for 2% of the ceramic powder mass, the nano-titanium oxide with a particle size of 50nm, commercial alumina short fibers and a particle size of 325 mesh (middle diameter d 50 Prepare ceramic powder for lightly burned magnesia powder (45 μm); mix and prepare rheological agent according to the mass ratio of polyvinyl butyral and hydroxyethyl cellulose at a ratio of 1:1.
[0063] According to mass percentage, 25% of nano-alumina sol with a solid content of 22%, 1.0% of rheological agent, and the rest are ceramic powder for batching. First, add the light-burned magnesia powder into the ball mill tank according to the proportion, mix the nano-alumina sol, nano-titanium dioxide, alumina short fiber, rheological agent and an appropriate amount of absolute ethanol and ultrasonically treat it for 45 minutes to make the alumina short-fiber powder After t...
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