Method for preparing metal ceramic gradient coated steel plate by self-stretching continuous mill

Abstract

On the hot-rolling production line, before the steel sheet to be hot-rolled is fed into hot-rolling rolls a self-spreading metal-ceramic gradient coating layer can be hot-sprayed on the surface of said steel sheet to be hot-rolled, after the hot-spraying process is completed, said steel sheet can be promptly hot-rolled, so that on the surface of steel sheet a Ti-C-Ni gradiet coating layer with excellent comprehensive performance can be formed. Said invention also provides the concrete steps of said hot-spraying process and the composition of said coating layer.

Description

Technical field: [0001] The invention relates to a method for preparing a coated steel plate, in particular to a method for preparing a cermet gradient coated steel plate by self-propagating spraying and continuous rolling. It belongs to the technical field of surface engineering. Background technique: [0002] At present, the coatings prepared by thermal spraying technology commonly used at home and abroad are inhomogeneous layered porous structures. Compared with the homogeneous structure of castings and forgings, the cohesive strength and interfacial bonding strength of the coating are much lower (about 1 / 3). The reasons are: [0003] 1. The substrate temperature is low, generally not higher than 200~300°C. The energy (including thermal energy and kinetic energy) of molten metal, ceramic or cermet is not enough to overcome the potential barrier between atoms to the extent of forming intragranular bonding. [0004] 2. The droplet temperature is low and the duration of ...

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Problems solved by technology

[0005] 3. Lack of pressure

However, a large number of experimental results show that it is very limited to improve the mechanical properties of the coating by only relying on the spraying process and adjusting the spraying materials.

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