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

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...

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 carrier and its preparation method. The catalyst carrier prepared by this method has a large specific surface area and a low expansion coefficient, but its thermal shock resistance is only 650 ℃ three times without cracking, it can meet the Euro III standard, but not the Euro IV standard

Images