A large-scale honeycomb ceramic carrier shell mud formula with high hardness and good water resistance without burning

Abstract

The invention discloses a formula of roasting-free large honeycomb ceramic carrier skin mud with high hardness and good water resistance. By weight part, the formula involves the following raw materials: 70-120 parts of cordierite powder, 15-45 parts of silica sol, 2-8 parts of glass fiber, 0.5-2 parts of methyl cellulose, 5-20 parts of a silica sol reinforcing agent and 15-30 parts of a skin mud waterproof agent. By adding the silica sol reinforcing agent and the skin mud waterproof agent to the traditional roasting-free skin mud formula, on the one hand, water resistance of the skin mud is strengthened, and on the other hand, during coating a large honeycomb ceramic carrier product with a catalyst, other inorganic materials in the catalyst solution can be prevented from being adsorbed into the skin mud to change the material composition of the skin mud. After introducing the two additives, the dried skin mud does not peel off and crack after soaking in water for 48h. The coated catalyst also does not crack after roasting, and the thermal shock resistance of the skin reaches over 700DEG C.

Description

technical field [0001] The invention relates to the field of large-scale honeycomb ceramic carrier skin mud formulations, in particular to a large-scale honeycomb ceramic carrier skin mud formula with high hardness and good water resistance without burning. Background technique [0002] The large-scale honeycomb ceramic carrier is a key component for diesel engines to meet the National IV and above emission standards. However, there are some technical problems in the use of large-scale honeycomb ceramic carriers on the market, especially the shedding and cracking of the outer skin of the product. The main problem faced by large honeycomb ceramic substrates. [0003] Since the product diameter of the large-scale honeycomb ceramic carrier is relatively large (the diameter is generally above 150mm), if such a large diameter is to ensure that the diameter tolerance of the product is within the range of 2mm, the method of one-time plastic extrusion molding of the traditional hone...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a large-scale honeycomb ceramic carrier skin mud formula with high hardness and good water resistance without firing, which effectively solves the problems of peeling off of the non-fired skin mud when exposed to water and cracking during firing

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