Method for preparing anti-high temperature oxidation mixed coating by electrophoretic codeposition

Abstract

This invention discloses a method for preparing high-temperature oxidation mixed coating of MCrAlx and Al with electrophoretic codeposition, first of all, which mixes MCrAl and 10~70wt% Al to mixed powder to be added with active elements to be matched to scattered suspension liquor by ball mill in an absolute organic solvent, and takes a matrix as the cathode to mix them at the same time, in which, the mixed powder is deposited on the cathode, the sample after electrophoretic deposition in the vacuum oven is hot-processed under 1000~1100deg.C to get the high-temperature oxidized MCrAlX and Al mixed coating under the constant potential mode.

Description

technical field [0001] The invention belongs to the technical field of material coating, and in particular relates to a method for preparing a high-temperature oxidation-resistant mixed coating by electrophoretic co-deposition of a mixed coating of MCrAlX and Al that is resistant to high-temperature oxidation on a complex-shaped substrate. Background technique [0002] MCrAlX (where M is Ni, Co or their alloys, and X is an active element) high-temperature oxidation-resistant coatings mainly use vacuum plasma spraying (VPS), electron beam physical vapor deposition (EBPVD), magnetron sputtering, and arc ion plating. method, but there are disadvantages such as expensive equipment and high cost, and it is not suitable for substrates with complex shapes. Therefore, it has become a research hotspot to explore methods with simple process, low cost and wide application. [0003] The U.S. patent with the application number US 5,124,006 electrophoretically deposited metal powder (com...

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Problems solved by technology

[0005] However, the above processes all have the problem that the follow-up treatment of the electrophoretic deposition layer is too complicated, or the required equipment is complicated, or heat treatment at high temperature is required for a long time, which will consume a lot of energy and increase the process cost, and the complicated follow-up treatment process will destroy The uniformity of the electrophoretic deposition layer limits the application of the electrophoretic deposition process in the preparation of high-temperature oxidation-resistant coatings

[0006] The present invention aims to solve the problem of complex follow-up heat treatment of the MCrAlX electrophoretic deposition layer, and proposes a new type of electrophoretic co-deposition process. Through electrophoretic co-deposition of mixed powder, the electrophoretic deposition layer and the substrate can be formed only through a simple heat treatment method. Dense metallurgical combination, and retains the advantage of uniform electrophoretic deposition layer (especially suitable for substrates with complex shapes), greatly simplifies subsequent processing, improves high temperature oxidation resistance, and expands the application range of electrophoretic deposition

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