Composite cermet coating for superalloy protection and preparation method thereof

A composite metal and ceramic coating technology, applied in the direction of metal material coating process, coating, vacuum evaporation plating, etc., to achieve the effect of reducing thermal stress, relieving thermal stress, and strong resistance to thermal cycle spalling
CN108796461BActive Publication Date: 2020-12-11JINAN UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
JINAN UNIVERSITY
Publication Date
2020-12-11

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Abstract

The invention discloses a composite metal ceramic coating for high-temperature alloy protection and a preparing method of the composite metal ceramic coating. The coating comprises a face layer and abottom layer with a nano columnar crystal structure. The face layer comprises at least two metal ceramic sub layers, and a metal parent phase and a dispersed distribution nitride ceramic phase are specifically included. In the direction from the surface of the composite metal ceramic coating to an alloy matrix, the doping amount of the nitride ceramic phase is gradually reduced, and the distribution interval of the volume fraction of the nitride ceramic phase is 0.1-60%. According to the preparing method of the coating, magnetic control sputtering is adopted for preparing a bottom layer coating, and then, non-balance reaction magnetic control sputtering is utilized for preparing the face layer of the doped ceramic phase. Through the structure, the heat expansion coefficient of the coatingis gradually increased from top to bottom, jumping changes of the heat expansion coefficient on the coating / oxide film interface are reduced, accordingly, the heat stress in an oxide film in the heatcirculation process is relieved, and the capability of oxide film peeling resisting of the coating in the heat circulation is enhanced.
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Description

technical field

[0001] The invention belongs to the technical field of high-temperature protective coatings, and in particular relates to a composite cermet coating for high-temperature alloy protection and a preparation method thereof. Background technique

[0002] As the hot end part of a turbine engine, single crystal superalloys not only need to withstand complex mechanical loads, but also need to withstand oxidation and corrosion in harsh environments. At present, advanced high-temperature protective coating material technology has become the three key technologies of gas turbine engine blades alongside new high-temperature structural material technology and new high-efficiency air-cooled blade technology. The MCrAlY cladding coating has excellent resistance to high temperature oxidation and hot corrosion, and can also be used as a bonding layer for thermal barrier coatings.

[0003] However, when the coating undergoes rapid heating and cooling, the surface oxide film ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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