Thermal shock resistant thin-walled cordierite honeycomb ceramics and preparation method thereof

A technology of cordierite honeycomb and thermal shock resistance, which is applied in the field of cordierite honeycomb ceramics, can solve the problems of catalyst carrier with large specific surface area, low thermal expansion mechanical strength, and failure to meet Euro IV standards, so as to improve product survival rate, Improved blendability and improved thermal shock resistance

Active Publication Date: 2012-04-25
JIANGSU PROVINCE YIXING NONMETALLIC CHEM MACHINERY FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently produced cordierite honeycomb ceramics have low thermal expansion and high mechanical strength, but their thermal shock resistance is not enough
The patent document with the application number CN200510037910.8 discloses a thin-walled cordierite honeycomb ceramic catalyst ca

Method used

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  • Thermal shock resistant thin-walled cordierite honeycomb ceramics and preparation method thereof
  • Thermal shock resistant thin-walled cordierite honeycomb ceramics and preparation method thereof
  • Thermal shock resistant thin-walled cordierite honeycomb ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The thermal shock-resistant thin-walled cordierite honeycomb ceramics are prepared according to the following steps.

[0033] (1) Mix bimodal α-alumina micropowder and oleic acid evenly;

[0034] (2) Mix the product obtained in step (1) with talc evenly;

[0035] (3) Mix the product obtained in step (2) with flaky kaolin, calcined kaolin, fused silica, PAO2 (a low-viscosity polyalphaolefin), methylcellulose and water;

[0036] (4) The product obtained in step (3) is molded, dried, and then sintered at a sintering temperature of 1400°C, kept at this sintering temperature for 10 hours, and then cooled to room temperature;

[0037] (5) The weight of each component in the above steps is shown in Table 1, and the unit of the data in Table 1 is kg.

[0038] Table 1

[0039]

Embodiment 2

[0041] Thermal shock-resistant thin-walled cordierite honeycomb ceramics are prepared according to the following steps:

[0042] (1) Mix bimodal α-alumina micropowder and activated alumina micropowder evenly;

[0043] (2) Mix the product obtained in step (1) with stearic acid evenly;

[0044] (3) Mix the product obtained in step (2) with talc evenly;

[0045] (4) uniformly mixing the product obtained in step (3) with flaky kaolin, calcined kaolin, fused quartz, aviation diesel, methylcellulose and water;

[0046] (5) The product obtained in step (4) is molded, dried, and then sintered at a sintering temperature of 1420°C, kept at this sintering temperature for 6 hours, and then cooled to room temperature;

[0047] (6) The weight of each component in the above steps is shown in Table 1, and the unit of the data in Table 1 is kg

Embodiment 3

[0049] Thermal shock-resistant thin-walled cordierite honeycomb ceramics are prepared according to the following steps:

[0050] (1) Mix bimodal α-alumina micropowder and activated alumina micropowder evenly;

[0051](2) Mix the product obtained in step (1) with sodium stearate evenly;

[0052] (3) Mix the product obtained in step (2) with talc evenly;

[0053] (4) uniformly mixing the product obtained in step (3) with flaky kaolin, calcined kaolin, fused quartz, corn oil, hydroxypropyl methylcellulose and water;

[0054] (5) The product obtained in step (4) is molded, dried, and then sintered at a sintering temperature of 1390°C, kept at this sintering temperature for 12 hours, and then cooled to room temperature;

[0055] (6) The weight of each component in the above steps is shown in Table 1, and the unit of the data in Table 1 is kg.

[0056] The detection performance of the thermal shock-resistant thin-walled cordierite honeycomb ceramics prepared in Examples 1-3 is sh...

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Abstract

The invention relates to a thermal shock resistant thin-walled cordierite honeycomb ceramics. The components of the thermal shock resistant thin-walled cordierite honeycomb ceramics comprise, by weight, 18-22 parts of bimodal alpha-alumina micro powder with the particle size of 3 mum, 0-10 parts of activated alumina micro powder with the particle size of 5 mum, 38-43 parts of talc with the particle size of 8 mum, 10-15 parts of flake kaolin with the particle size of 2 mum, 20-25 parts of calcined kaolin with the particle size of 2 mum, and 5-10 parts of fused quartz with the particle size of 5 mum. The preparation method comprises the following steps: (1) uniformly mixing the bimodal alpha-alumina micro powder and the activated alumina micro powder; (2) uniformly mixing the resulting mixture from the step (1) and a surfactant; (3) uniformly mixing the resulting mixture from the step (2) and the talc; (4) uniformly mixing the resulting mixture from the step (3) with the flake kaolin, the calcined kaolin, the fused quartz, a binder, a lubricant and water; (5) carrying out treatments of forming, drying, sintering and thermal insulation, and then cooling to the room temperature to obtain the thermal shock resistant thin-walled cordierite honeycomb ceramics. The thermal shock resistant thin-walled cordierite honeycomb ceramics of the present invention has advantages of high mechanical strength, moderate porosity, and low expansion coefficient. The thermal shock resistance of the thermal shock resistant thin-walled cordierite honeycomb ceramics is that: the thermal shock resistant thin-walled cordierite honeycomb ceramics does not crack in three tests at the temperature of 750 DEG C. The thermal shock resistant thin-walled cordierite honeycomb ceramics meets the European IV emission standard.

Description

technical field [0001] The invention relates to the technical field of catalyst carriers, in particular to a cordierite honeycomb ceramic with high thermal shock resistance. Background technique [0002] When the car is running, the temperature of the head section of the exhaust pipe is the highest. When driving on a flat road, the temperature of the head section of the exhaust pipe is about 300~400°C. When driving on a mountain road, the temperature is about 500~650°C. The highest temperature can reach 700~750℃. This requires that the catalyst carrier for automobile exhaust purification has excellent thermal shock resistance. In addition, the exhaust gas is relatively thick when the car is just started, which requires a fast reaction speed of the catalyst, so the wall thickness of the catalyst carrier should be small. [0003] Cordierite honeycomb ceramic is a conventional catalyst carrier for purifying automobile exhaust, and its basic composition is 2MgO·2Al 2 o 3 ·5Si...

Claims

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Application Information

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IPC IPC(8): C04B35/195C04B35/622
Inventor 沈琴娟冯家迪何卫平
Owner JIANGSU PROVINCE YIXING NONMETALLIC CHEM MACHINERY FACTORY
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