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Silicon nitride whisker reinforced corundum porous ceramic filter and preparation method thereof

A technology of silicon nitride whiskers and porous ceramics, applied in the field of corundum porous ceramic filters, can solve the problem that the filtration efficiency needs to be improved, the strength of the filter skeleton and the thermal shock stability are improved, and the adsorption capacity and purification effect of non-metallic inclusions are limited. and other problems, to achieve the effect of improving thermal shock stability, improving thermal shock stability, and absorbing failure stress

Active Publication Date: 2021-05-07
浙江兰欣复合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In summary, there are still some technical defects in the existing corundum porous ceramic filter: (1) The surface of the filter skeleton is relatively dense, which limits the adsorption capacity and purification effect of non-metallic inclusions; (2) The strength of the filter skeleton and Thermal shock stability needs to be improved; (3) Filtration efficiency needs to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0049] Step 1, preparation of modified porous corundum ceramic fine powder

[0050] Step 1.1. Raise the temperature of aluminum hydroxide fine powder to 320-460°C at a rate of 2-3°C / min, keep it warm for 1-3 hours, and cool to obtain high-porosity alumina fine powder.

[0051] Step 1.2: Put 96-99wt% of the high-porosity alumina fine powder and 1-4wt% light-burned magnesite fine powder in a mixer, and stir for 1-3 hours to obtain the mixture I.

[0052] Step 1.3. According to the mass ratio of the mixture I: magnesium chloride solution is 1:0.03-0.06, add the magnesium chloride solution into the mixture I, and mix for 10-20 minutes to obtain the mixture II. The mixture II is machine-pressed at 100-150 MPa, and the molded green body is dried at 110°C for 18-36 hours; then the temperature is raised to 1650-1750°C at a rate of 4-5°C / min, and the temperature is kept for 2 ~6h, that is, porous corundum ceramics.

[0053] Step 1.4, crushing and sieving the porous corundum ceramics ...

Embodiment 1

[0085] A silicon nitride whisker-reinforced corundum porous ceramic filter and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0086] Step 1, preparation of modified porous corundum ceramic fine powder

[0087] Step 1.1. Heat up the aluminum hydroxide fine powder to 320° C. at a rate of 2° C. / min, keep it warm for 1 hour, and cool down to obtain alumina fine powder with high porosity.

[0088] Step 1.2: Put 96wt% of the high-porosity alumina fine powder and 4wt% light-burned magnesite fine powder in a mixer, and stir for 1 hour to obtain the mixture I.

[0089] Step 1.3. According to the mass ratio of the mixture I: magnesium chloride solution is 1:0.03, add the magnesium chloride solution into the mixture I, and mix for 10 minutes to obtain the mixture II. The mixture II was machine-pressed at 100 MPa, and the formed green body was dried at 110°C for 18 hours; then heated to 1650°C at a rate of 4°C / min and kept for 2 hou...

Embodiment 2

[0114] A silicon nitride whisker-reinforced corundum porous ceramic filter and a preparation method thereof. The steps of the preparation method described in this embodiment are:

[0115] Step 1, preparation of modified porous corundum ceramic fine powder

[0116] Step 1.1. Raise the temperature of aluminum hydroxide fine powder to 370°C at a rate of 2.5°C / min, keep it warm for 1.5h, and cool down to obtain alumina fine powder with high porosity.

[0117] Step 1.2: Put 97wt% of the high-porosity alumina fine powder and 3wt% light-burned magnesite fine powder in a mixer and stir for 1.5 hours to obtain the mixture I.

[0118] Step 1.3. According to the mass ratio of the mixture I: magnesium chloride solution is 1:0.04, add the magnesium chloride solution into the mixture I, and mix for 13 minutes to obtain the mixture II. The mixture II was machine-pressed at 120MPa, and the formed green body was dried at 110°C for 24 hours; then the temperature was raised to 1680°C at a rate...

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Abstract

The invention relates to a silicon nitride whisker reinforced corundum porous ceramic filter and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: mixing modified porous corundum ceramic fine powder, monatomic silicon powder and [alpha]-Al2O3 micro powder, adding sodium carboxymethyl cellulose, a water reducing agent, a defoaming agent, aluminum sol and deionized water, and stirring to obtain ceramic slurry (ceramic slurry for short) with thixotropy; immersing the pretreated polyurethane foam template into ceramic slurry, removing redundant slurry, curing, drying, and pre-sintering in a high-temperature furnace at 1200-1300 DEG C to obtain a silicon nitride whisker reinforced corundum porous ceramic filter pre-sintered body; and then dipping in ceramic slurry, carrying out vacuum pressure maintaining, centrifugal treatment, natural drying and heating drying, and sintering in a high-temperature furnace at 1350-1450 DEG C to obtain the silicon nitride whisker reinforced corundum porous ceramic filter. The prepared product is high in strength, good in thermal shock resistance, high in purification capacity and high in filtering effect, and is suitable for purification of aluminum and aluminum alloy melts and high-quality molten steel.

Description

technical field [0001] The invention belongs to the technical field of corundum porous ceramic filters. In particular, it relates to a silicon nitride whisker-reinforced corundum porous ceramic filter and a preparation method thereof. Background technique [0002] Non-metallic inclusions in molten metal will not only affect the appearance of metal products, but also seriously endanger their performance and life, which is one of the important reasons restricting the improvement of metal quality. The use of ceramic filters to remove non-metallic inclusions in the final stage of molten metal casting is an important way to improve the purity of metals and improve the quality of metals. [0003] Corundum porous ceramic filter is one of the main varieties of molten metal purification filter. Research on corundum porous ceramic filters has progressed. For example, the patented technology of "Preparation Method of Alumina Porous Ceramic Foam Filter" (CN201210500465.6) uses alumin...

Claims

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Application Information

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IPC IPC(8): C04B38/08C04B35/66C04B35/10C22B9/02
CPCC04B38/08C04B35/66C04B35/10C22B9/023C04B2235/3206C04B2235/3272C04B2235/3275C04B2235/3279C04B2235/602C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6585C04B2235/5436C04B2235/96C04B2235/77C04B38/067Y02P10/20
Inventor 鄢文刘莹支瑾娜陈茜琳梁雄李亚伟
Owner 浙江兰欣复合材料科技有限公司
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