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 ca

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0049]Step 1, the preparation of modified multi-hole corundum ceramic fine powder

[0050]Step 1.1, the aluminum hydroxide fine powder was raised to 320 to 460 ° C, heat insulation 1 to 3 h, cooled, ie, high porosity of alumina fine powder at a rate of 2 to 3 ° C / min.

[0051]Step 1.2, at 96 to 99 wt% of the high porosity of the high porosity of aluminum oxide fine powder and 1 to 4 wt% light burning magnesium powder, stirred from 1 to 3 hours, i.e., the mixture I.

[0052]Step 1.3, the mass ratio of the mixture I: magnesium chloride solution is from 1: 0.03 to 0.06, and the magnesium chloride solution is added to the mixture I, mixing 10 to 20 min, resulting in a mixture II. The mixture II is pressed into a form of 100 to 150 MPa, and the molded blank is dried under 110 ° C for 18 to 36 h; then heating the rate of 4 to 5 ° C / min to 1650 to 1750 ° C, heat insulation 2 ~ 6h, you have a porous corundum ceramic.

[0053]Step 1.4, break the porous corundum ceramic, sieve, to obtain a porous cor...

Example Embodiment

[0084]Example 1

[0085]A silicon nitride crystal must be enhanced azurous porous ceramic filter and a preparation method thereof. The step of the preparation method of this embodiment is:

[0086]Step 1, the preparation of modified multi-hole corundum ceramic fine powder

[0087]Step 1.1, the aluminum hydroxide fine powder was raised to 320 ° C, heat insulation for 1 h, cooled, ie, high porosity of alumina fine powder at a rate of 2 ° C / min.

[0088]Step 1.2, at 96 wt% of the high porosity of the high porosity of alumina fine powder and 4 wt% light burning magnesium powder in the mixer, stirred for 1 h, i.e., the mixture I.

[0089]Step 1.3, according to the mass ratio of the mixture I: magnesium chloride solution of 1: 0.03, and the magnesium chloride solution was added to the mixture I, mixed 10 min to give a mixture II. The mixture II was pressed into a form of 100 MPa conditions, and the molded blank was dried under 110 ° C for 18 h; then heated to 1650 ° C at a rate of 4 ° C / min, and the...

Example Embodiment

[0113]Example 2

[0114]A silicon nitride crystal must be enhanced azurous porous ceramic filter and a preparation method thereof. The step of the preparation method of this embodiment is:

[0115]Step 1, the preparation of modified multi-hole corundum ceramic fine powder

[0116]Step 1.1, the aluminum hydroxide fine powder was raised to 370 ° C, heat insulation 1.5 h, cooled, ie, high porosity of alumina fine powder at a rate of 2.5 ° C / min.

[0117]Step 1.2, at 97 wt% of the high porosity alkalite powder and 3 wt% light burning magnesium powder, stirred at the mixer, stirred 1.5 h, that is, the mixture I.

[0118]Step 1.3, according to the mass ratio of the mixture I: magnesium chloride solution is 1: 0.04, and the magnesium chloride solution is added to the mixture I, mixing 13 minutes, resulting in a mixture II. The mixture II was pressed into a 120 MPa condition, and the molded blank was dried at 110 ° C for 24 h; then heated to 1680 ° C at a rate of 4.5 ° C / min, and the porous corundum c...

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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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