Lacunaris metal carrier and manufacturing method thereof

Abstract

The invention discloses a porous metal carrier and a preparation method thereof. The porous metal carrier has a continuous micro-porous structure formed through mutual connection of polyhedron cabinets; a first layer is a substrate metal layer which comprises one or a plurality of the compositions: nickel, iron or copper; metal quantity of the substrate metal layer is more than or equal to 100g / m<2>; a function metal coating of MCrAl or MCrAlR is arranged on the substrate metal layer and M refers to Fe, Ni and Co or alloy of Fe, Ni and Co and R is rare earth element. The preparation method includes the following steps: first, metallization pretreatment is carried out for nonmetal porous substrate to form the substrate metal layer; second, the function metal layer with chromium and aluminum are sprayed on the substrate metal layer by adopting a thermal spraying process; at last, flame remelt and induction remelt are carried out for the function coating. The material provided by the invention has high porosity, large surface area, high strength, favorable flow disturbance, excellent high temperature and oxidization resistance, simple preparation method and process and low cost.

Description

technical field [0001] The invention relates to an alloy material and a preparation method thereof, in particular to a porous metal carrier and a preparation method thereof. Background technique [0002] In motor vehicle exhaust purifiers, ceramic honeycomb materials are currently mostly used as exhaust gas purification catalyst carriers in China, while metal honeycomb materials are commonly used abroad. Compared with the ceramic carrier, the metal carrier has the following advantages: 1) small heat capacity, high thermal conductivity, rapid ignition of exhaust gas; 2) excellent mechanical strength, good shock resistance, long service life; 3) high porosity, exhaust Low gas back pressure is conducive to improving engine performance and good economy; 4) Various structures and high specific surface area can effectively improve catalytic activity and exhaust gas purification rate. As the country's requirements for motor vehicle exhaust emission standards become more and more s...

AI Technical Summary

Problems solved by technology

[0003] At present, metal carriers at home and abroad are generally formed by metal foil rolling, coiling, brazing, assembly and other processes, which is costly. At the same time, in order to ensure the processing performance of the foil, the content of chromium and aluminum is limited, sacrificing its high temperature oxidation resistance.

The metal carrier formed by rolling has straight channels and smooth surface, resulting in poor catalyst adhesion and small specific surface area per unit volume, thus limiting the use efficiency of the catalyst