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Composite metal ceramic coating for high-temperature alloy protection and preparing method of composite metal ceramic coating

A composite metal and ceramic coating technology, applied in metal material coating process, coating, ion implantation plating, etc., to achieve the effect of strong resistance to thermal cycle spalling, reduction of jump, and reduction of thermal stress

Active Publication Date: 2018-11-13
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the practical application of diffusion barriers has not yet matured due to the constraints of preparation costs, mechanical properties, and barrier properties.

Method used

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  • Composite metal ceramic coating for high-temperature alloy protection and preparing method of composite metal ceramic coating
  • Composite metal ceramic coating for high-temperature alloy protection and preparing method of composite metal ceramic coating
  • Composite metal ceramic coating for high-temperature alloy protection and preparing method of composite metal ceramic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Taking the second-generation single crystal superalloy N5 as the alloy matrix sample, the nanocrystalline NiCrAlYHfSi bottom layer was prepared on the surface of the alloy N5 by magnetron sputtering, and then the reaction gas N2 , and by controlling N 2 The flux in the deposition process is used to prepare the surface layer of the composite cermet coating, and the specific preparation process is as follows:

[0047] (1) Prepare N5 single crystal alloy and NiCrAlYSiHf target material by vacuum smelting method, the target material composition is: 25wt% Cr, 10wt% Al, 0.5wt% Y, 0.5wt% Hf, 0.5wt% Si, balance For you.

[0048] (2) Before coating, the alloy was polished with sandpaper, and then mechanically polished with a diamond polishing paste with a specification of 2.5 μm. Finally, the sample was ultrasonically cleaned with acetone and alcohol, and dried for later use.

[0049] (3) Prepare the bottom layer of nano-columnar crystal NiCrAlYHfSi on the surface of N5 alloy b...

Embodiment 2

[0069] The experimental conditions and steps refer to Example 1. The difference from Example 1 is that the alloy matrix sample is K417G, and the N 2 The partial pressure is: 0.1Pa for the first 2 hours, and 0.12Pa for the next 1.5 hours; the total thickness of the surface layer is 12-14 μm, and the thickness of the bottom layer is 15-18 μm. The volume fractions of AlN are: 28vol.%, 15vol.%. Figure 5 It is the microscopic morphology of the surface layer of the coating at the nanometer scale, and it can be seen that the grain size of the surface layer is 4-10nm. The content of the main elements in the two sublayers of the coating containing nitrides detected by energy spectrum analysis is 59Ni–23Cr–11Al–7N (wt.%); 62Ni–23Cr–11Al–4N (wt.%). Figure 6 The SEM interface picture of its composite metal-ceramic coating oxidized at 1000°C for 100h, by Figure 6 It can be seen that there are obvious Cr at the interface between the coating and the alloy 23 C 6 A phase barrier layer ...

Embodiment 3

[0071] See Example 1 for the experimental conditions and steps. The difference from Example 1 is that the nickel-based superalloy K438 is used as the substrate, and the N 2 The partial pressure is 0.1Pa for the first 2h and 0.13Pa for the last 1.5h, and the total deposition is 3.5 hours; the total thickness of the surface layer is 10-12μm, and the thickness of the bottom layer is 15-18μm. Energy spectrum analysis shows that along the direction from the coating surface to the substrate sample, the main element contents in the two sublayers of the surface layer are 59Ni–22Cr–11Al–7N (wt.%) and 62Ni–24Cr–11Al–3N (wt.%) .%). After the coating was annealed at 1000 °C for 1 h, the main constituent phases were γ / γ' and AlN phases. The hardness of the coating was measured after the surface oxide was removed, and the hardness range was about 740±5HV. according to Figure 7 It can be seen that after the coating is oxidized at 1000°C for 100 hours, a continuous and dense aluminum oxid...

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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.

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

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/02C23C14/06
CPCC23C14/0084C23C14/025C23C14/0641C23C14/35
Inventor 任盼阳颖飞李卫
Owner JINAN UNIVERSITY
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