A kind of cordierite honeycomb ceramic carrier with full oxide as raw material and preparation method thereof

Abstract

The invention discloses a cordierite honeycomb ceramic carrier using complete oxides as a raw materials and a preparation method thereof. The cordierite honeycomb ceramic carrier comprises 32-38% of alumina, 12-15% of active magnesia and 47-54% of silica dioxide. The raw materials including oxides are chemical products and have wide available sources. The morphology of the raw materials is easy to control, and the materials ,can achieve a big diameter-to-thickness ratio. The inventions has the advantages of being simple in the preparation method, easy to implement, high in softening temperature, high in pass rate in the extrusion and baking processes. The cordierite mainly uses alumina as a template to grow, so it is prone to achieving the directional array of the cordierite. The acquired ceramic carrier has a low coefficient of thermal expansion.

Description

technical field [0001] The invention relates to a cordierite honeycomb ceramic carrier using total oxide as a raw material and a preparation method thereof, belonging to the technical field of catalyst carriers. Background technique [0002] The cordierite honeycomb ceramic carrier is a catalyst carrier for gaseous pollution emission post-treatment technology of internal combustion engines, such as: SCR carrier, TWC carrier, DOC carrier, DPF, GPF, etc. With the rapid tightening of emission regulations on motor vehicle exhaust pollutants and the rapid tightening of motor vehicle economic regulations, the wall thickness of the honeycomb ceramic carrier must be reduced to less than 5mil to obtain a larger surface area for catalyst coating and lower flow resistance. As the wall thickness decreases, the thermal shock performance also decreases, and the requirements for the thermal expansion coefficient (CTE) of the cordierite honeycomb ceramic carrier are higher, and the CTE is ...

AI Technical Summary

Problems solved by technology

[0004] CN104030720B discloses a cordierite honeycomb ceramic carrier with zero firing shrinkage and a preparation method thereof. In the method, the main raw materials are composed of flaky kaolin, flaky talcum powder, flaky alumina powder, magnesia powder, and silicon oxide powder. Although it is revealed that the directional arrangement of flaky alumina can reduce the coefficient of thermal expansion, the core is still oriented arrangement of flaky talc and kaolin to reduce the coefficient of thermal expansion, and the relationship between the diameter-thickness ratio of flaky alumina and the thermal expansion coefficient is not separately reflected.

However, when the raw materials are all oxides, there are some difficulties in the production of cordierite honeycomb ceramics, for example: ① lack of kaolin and talc ingredients, all oxide raw materials are barren materials, mud plasticity is poor, and extrusion molding is difficult; ② full Oxide raw materials have high hardness, and the particles have edges and corners, which will cause severe wear and tear on mud refining, extrusion equipment, and molds; ③The reactivity of all oxide raw materials is low, which will cause an increase in thermal expansion coefficient

Images