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Method and equipment for coating slurry layer on cellular carrier of ceramics

A technology of ceramic honeycomb and carrier, which is applied to the device and coating of surface coating liquid, which can solve the problem of difficulty in achieving quantitative, uniform and consistent product quality, inability to perform quantitative coating, waste of slurry raw materials, etc. problems, to achieve the effect of improving quality and purification effect, good transformation effect, and convenient production management

Inactive Publication Date: 2005-08-31
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] At present, most manufacturers of automobile exhaust catalytic purification catalysts in China use manual methods to manufacture, and cannot carry out quantitative coating. This kind of method has defects in minimizing the amount of coating. The slurry is coated on the outer surface of the ceramic honeycomb carrier, resulting in slurry Raw material waste, especially expensive catalyst active noble metals such as platinum, palladium and rhodium, is more of a problem when used as coatings
[0005] The above manual method is to immerse the ceramic honeycomb carrier in the liquid containing the slurry, take out the ceramic honeycomb carrier after a period of time, and then use the manual compressed air spray gun to purge the excess slurry on the small holes of the ceramic honeycomb carrier method, the thickness of the required uniform coating slurry cannot be obtained on the inner surface of the small hole of the carrier, and this coating method is difficult to achieve quantitative, uniform and consistent product quality

Method used

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  • Method and equipment for coating slurry layer on cellular carrier of ceramics
  • Method and equipment for coating slurry layer on cellular carrier of ceramics
  • Method and equipment for coating slurry layer on cellular carrier of ceramics

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Embodiment

[0037] Embodiment: the formula of alumina coating slurry is 2kg monohydrate aluminum oxide powder, add 3250-3650ml H 2 O and 550ml of concentrated nitric acid are put in a ball mill for ball milling for 6-15h to obtain a slurry with a pH of 3-5, a specific gravity of 1.20-1.35, and a viscosity of 40-70 centipoise. There will be no precipitation if the slurry is not stirred within 24 hours.

[0038] The ceramic honeycomb carrier specifications used in this embodiment:

[0039] Φ100×100mm, 400 holes / in 2 ; Wall thickness 0.18-0.21mm; Water absorption 23-26%;

[0040] The basic structure of coating device see figure 1 and figure 2 .

[0041] In the device of the present invention, the connections that need to transmit gas, water and slurry between the components are pipeline connections, and the pipeline can be a metal pipeline, such as stainless steel; it can also be a pipeline made of organic polymer materials, such as polytetrafluoroethylene vinyl etc. The pipe diamete...

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Abstract

A process for coating the slurry on the surface of cellular ceramic carrier inclues such steps as arranging the cellular ceramic carrier to a particular working position by automatic fixture, sealing it, delivering the slurry via tube, negative-pressure coating, and positive-pressure scavenge to remove excessive slurry.

Description

technical field [0001] The invention relates to a method for coating a slurry coating of a ceramic honeycomb carrier. [0002] The invention also relates to a device for carrying out the above-mentioned method. Background technique [0003] The catalytic converters commonly used by people provide as much contact area as possible for the catalyst. The common method is to make the catalyst carrier into a structure with micropores, so that the area of ​​the catalyst can be increased under a certain volume. For ease of description, the present invention is described by taking the exhaust catalytic converter for automobiles as an example. In the purification of automobile exhaust, the use of catalytic converters is currently recognized as an effective method for purifying pollutants. It can effectively remove CO, HC and NO from automobile exhaust. x and other toxic and harmful substances into harmless CO 2 、H 2 O and N 2 ; and the active substances of the catalyst are curren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05C7/04B05C9/12B05C11/06B05D1/00
Inventor 田群陈宏德贺泓沈迪新苏建华刘龙湖
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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