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Zero-firing-shrinkage cordierite honeycomb ceramic carrier and preparation method thereof

A cordierite honeycomb and ceramic carrier technology is applied in ceramic products, other household appliances, applications, etc., and can solve the problems of large firing shrinkage, low yield, large drying shrinkage of cordierite honeycomb ceramics, etc. The effect of high firing rate

Active Publication Date: 2014-09-10
SHANDONG AOFU ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cordierite honeycomb ceramics produced by this method have problems such as large drying shrinkage, large firing shrinkage, firing cracking, and low yield.

Method used

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  • Zero-firing-shrinkage cordierite honeycomb ceramic carrier and preparation method thereof
  • Zero-firing-shrinkage cordierite honeycomb ceramic carrier and preparation method thereof
  • Zero-firing-shrinkage cordierite honeycomb ceramic carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] figure 1It is a kind of flaky alumina with an aspect ratio of 4:1, 20.17% of D50=20μm flake alumina with an aspect ratio of 4:1, 4.11% of D50=2.0μm highly active magnesia, 15.24% of D50=4.0μm fused quartz, 27.12% of D50=15μm flake talc, 33.36% of D50=6μm raw kaolin are mixed as inorganic powder, the sum of inorganic powder is 100%, plus 4% Methylcellulose, 0.5% silicone polyether copolymer (such as Dow Corning's DC series), 1% soybean oil and 35% water. After fully dry mixing, kneading, and vacuum smelting, it is extruded into a honeycomb ceramic catalyst carrier with a diameter of 330.2×152.4mm and 400 holes / square inch. After drying, it is fired at 1415°C for 8 hours, and the firing shrinkage is 0. %, the firing pass rate is 98.7%. The performance of the prepared cordierite honeycomb ceramic carrier is: thermal expansion coefficient 0.82×10 -6 / °C (room temperature-800°C), water absorption rate is 33%, compressive strength parallel to the axial direction is 16.7MPa...

Embodiment 2

[0041] figure 2 It is a kind of flaky alumina with an aspect ratio of 6:1, 24.55% of D50=15μm flake alumina with an aspect ratio of 6:1, 6.85% of D50=1.0μm highly active magnesia, 25.40% of D50=5.0μm fused silica, 19.37% of D50=10μm flake talc, 23.83% of D50=4μm raw kaolin are mixed as inorganic powder, the total amount of inorganic powder is 100%, plus 5% Methylcellulose, 0.5% silicone polyether copolymer (such as Dow Corning's DC series), 1% soybean oil and 34% water. After fully dry mixing, kneading, vacuum refining, extruding into a honeycomb ceramic catalyst carrier of Φ330.2×152.4mm, 400 holes / square inch, after drying, it is fired at 1415°C for 8 hours, and the carrier shrinks to 0%, the firing pass rate is 99.2%. Properties of cordierite honeycomb ceramic carrier: thermal expansion coefficient 0.78×10 -6 / °C (room temperature-800°C), water absorption rate is 34%, compressive strength parallel to the axial direction is 18.4MPa, thermal shock performance: 650°C air c...

Embodiment 3

[0043] image 3 It is a kind of flaky alumina with an aspect ratio of 8:1, 31.12% of flaky alumina with an aspect ratio of D50=10μm, 10.56% of high-activity magnesium oxide with D50=0.6μm, 40.54% of D50=6.0μm fused silica, 7.65% of D50=6μm flake talc, 10.13% of D50=2μm raw kaolin are mixed as inorganic powder, the sum of inorganic powder is 100%, plus 6% Methylcellulose, 0.8% silicone polyether copolymer (such as Dow Corning's DC series), 1% soybean oil and 33% water. After fully dry mixing, kneading, and vacuum smelting, extrude into a honeycomb ceramic catalyst carrier of Φ330.2×152.4mm, 400 holes / square inch, after drying, cut, and fire at 1415°C for 8 hours. The final firing shrinkage is 0%, and the firing pass rate is 100%. The performance of the obtained cordierite honeycomb ceramic carrier is: thermal expansion coefficient 0.7×10 -6 / °C (room temperature-800°C), water absorption rate of 36%, compressive strength parallel to the axial direction of 19.0MPa, thermal shoc...

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Abstract

The invention relates to a zero-firing-shrinkage cordierite honeycomb ceramic carrier and a preparation method thereof. The carrier comprises the following raw materials in percentage by weight: 20-32 wt% of tabular alumina, 4-11 wt% of magnesium oxide, 15-45 wt% of electroquartz, 7-30 wt% of talcum and 10-35 wt% of kaolin, totaling 100%. The carrier also comprises an organic assistant and water. The preparation method comprises the following steps: by using alumina, magnesium oxide, electroquartz, talcum and kaolin as inorganic powder, adding the organic assistant and water, mixing, slurrying, extruding, drying, cutting and firing. The cordierite honeycomb ceramic carrier has the advantages of zero firing shrinkage, high firing qualification rate and low production cost.

Description

technical field [0001] The invention relates to the technical field of catalyst carriers, in particular to a cordierite honeycomb ceramic carrier and a preparation method thereof, in particular to a cordierite honeycomb ceramic carrier with zero firing shrinkage and a preparation method thereof. Background technique [0002] Nitrogen oxides NOx are precursors of photochemical smog and an important cause of atmospheric haze. The high share of motor vehicle NOx emissions in the atmosphere has become a key pollution source for control. In order to meet the requirements of relevant national emission regulations, medium and heavy-duty motor vehicles must be installed with oxidation catalyst DOC, selective catalytic reduction SCR, ammonia slip catalyst ASR or three-way catalytic converter TWC post-treatment components, all kinds of catalytic converters are in large size ( Diameter ≥ 250mm) honeycomb ceramics as catalyst carrier. [0003] At present, such cordierite honeycomb cera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/195C04B35/622
Inventor 黄妃慧张兆合
Owner SHANDONG AOFU ENVIRONMENTAL PROTECTION SCI & TECH
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