A kind of basic magnesium sulfate whisker in-situ synthesis magnesium aluminum spinel reinforced magnesium oxide based ceramic foam filter and preparation method thereof
A technology of magnesium oxide-based ceramics and magnesium sulfate whiskers, which is applied in the field of metal materials and metallurgy, can solve the problems of reduced chemical stability of intergranular bonding, lower sintering temperature of magnesium oxide ceramics, and operating restrictions, and achieve excellent chemical stability , Lower sintering temperature, good strength effect
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Embodiment 1
[0048] According to the ratio that basic magnesium sulfate whiskers account for 1% of the ceramic powder mass, weigh commercial basic magnesium sulfate whiskers (about 1 μm in diameter, 50 μm to 100 μm in length) and a particle size of 250 mesh (median 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.
[0049] 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, according to the ratio, the light-burned magnesia powder is added to the ball mill tank, and the nano-alumina sol, basic magnesium sulfate whiskers, rheology agent and an appropriate amount of absolute ethanol (the amount of addition is determ...
Embodiment 2
[0053] Account for the proportioning of 3% of the ceramic powder quality according to basic magnesium sulfate whisker, take commercialization basic magnesium sulfate whisker and particle diameter and be 500 orders (middle diameter d 50 Prepare 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.
[0054] According to mass percentage, 20% of nano-aluminum 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 magnesium oxide powder into the ball mill tank according to the proportion, mix the nano-alumina sol, basic magnesium sulfate whiskers, rheology agent and an appropriate amount of absolute ethanol and ultrasonically treat it for 60 minutes to make the basic magnesium sulfate whiskers After the powder is fully dispersed, add it to the ball mill jar, then ad...
Embodiment 3
[0058] Account for the proportioning of 2% of ceramic powder quality according to basic magnesium sulfate whisker, take commercialization basic magnesium sulfate whisker and particle diameter and be 325 order (medium 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.
[0059]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 magnesium oxide powder into the ball mill tank according to the proportion, mix the nano-alumina sol, basic magnesium sulfate whiskers, rheological agent and an appropriate amount of absolute ethanol and ultrasonically treat it for 45 minutes to make the basic magnesium sulfate whiskers After the powder is fully dispersed, add it to the ball mill tank, then add corundum...
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