Silicon carbide whisker reinforced porous magnesium oxide-carbon ceramic filter and preparation method thereof
A technology of porous magnesium oxide and silicon carbide whiskers, which is applied in chemical instruments and methods, ceramic products, separation methods, etc., can solve the problem of poor adsorption capacity of small-sized inclusions, reduced filter thermal shock stability, and strength to be further enhanced and other problems, to achieve the effect of improving the performance of slurry, improving the thermal shock stability and strength, and improving the material strength and thermal shock stability
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[0052] Step 1. Preparation of Porous Magnesium Oxide Particles
[0053] Step 1.1. Put the magnesite particles into the medium temperature furnace, first heat up to 650~800°C at a rate of 2~6°C / min, and keep the temperature for 2.5~4.5h; then heat up to 1150~1150°C at a rate of 2.2~4.6°C / min 1350 ℃, heat preservation for 2 to 7 hours, and cooling to obtain porous magnesium oxide agglomerates.
[0054] Step 1.2, according to the mass ratio of the porous magnesium oxide agglomerate:aluminum sol is 100:(24~32), first put the porous magnesium oxide agglomerate into the vacuum mixer, evacuate to 2~3kPa, and then add The aluminum sol is stirred for 15 to 30 minutes, and the vacuum system is closed to obtain a mixture.
[0055] Step 1.3, drying the mixture at 110-120°C for 18-36h, then placing it in a high-temperature furnace, heating up to 1650-1750°C at a rate of 3-5°C / min, maintaining the temperature for 3-7h, and cooling, Porous magnesium oxide particles are obtained.
[0056] ...
Embodiment 1
[0083] A silicon carbide whisker reinforced porous magnesia-carbon ceramic filter and a preparation method thereof. The preparation method of the present embodiment is:
[0084] Step 1. Preparation of Porous Magnesium Oxide Particles
[0085] Step 1.1. Put the magnesite particles into a medium-temperature furnace, first heat up to 650°C at a rate of 2°C / min, and keep for 2.5 hours; then heat up to 1150°C at a rate of 2.2°C / min, hold for 2 hours, and cool to obtain porous Magnesium oxide agglomerates.
[0086] Step 1.2, according to the mass ratio of the porous magnesium oxide agglomerate:aluminum sol is 100:24, first put the porous magnesium oxide agglomerate into a vacuum mixer, evacuate to 2kPa, then add the aluminum sol, stir After 15 min, the vacuum system was turned off to obtain a mixture.
[0087] Step 1.3: The mixture was dried at 110°C for 18h, then placed in a high-temperature furnace, heated to 1650°C at a rate of 3°C / min, maintained for 3h, and cooled to obtain po...
Embodiment 2
[0110] A silicon carbide whisker reinforced porous magnesia-carbon ceramic filter and a preparation method thereof. The preparation method of the present embodiment is:
[0111] Step 1. Preparation of Porous Magnesium Oxide Particles
[0112] Step 1.1. Put the magnesite particles into a medium-temperature furnace, first heat up to 700°C at a rate of 3°C / min, and hold for 3 hours; then heat up to 1200°C at a rate of 2.5°C / min, hold for 3.5 hours, and cool to obtain porous Magnesium oxide agglomerates.
[0113] Step 1.2, according to the mass ratio of the porous magnesium oxide agglomerate:aluminum sol is 100:26, first put the porous magnesium oxide agglomerate into a vacuum mixer, evacuate to 2.4kPa, and then add the aluminum sol, After stirring for 20 min, the vacuum system was turned off to obtain a mixture.
[0114] Step 1.3: The mixture was dried at 120°C for 25h, then placed in a high-temperature furnace, heated to 1680°C at a rate of 4°C / min, kept for 5h, and cooled to...
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Abstract
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