High-temperature environment barrier coating layer structure and preparation method thereof

A high-temperature environment and coating technology, which is applied in coatings, metal material coating processes, molten spraying, etc., can solve the problems of no resistance to CMAS corrosion, reduced strain tolerance of environmental barrier coatings, and high chemical activity. Improve working life and reliability, excellent CMAS corrosion resistance, good physical and chemical compatibility

A high-temperature environment and coating technology, which is applied in coatings, metal material coating processes, molten spraying, etc., can solve the problems of no resistance to CMAS corrosion, reduced strain tolerance of environmental barrier coatings, and high chemical activity. Improve working life and reliability, excellent CMAS corrosion resistance, good physical and chemical compatibility

CN108950463AActive Publication Date: 2018-12-07AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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  • High-temperature environment barrier coating layer structure and preparation method thereof
  • High-temperature environment barrier coating layer structure and preparation method thereof

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[0029] Embodiments of the present invention provide a high-temperature environment barrier coating structure and its preparation method, especially the high-temperature environment barrier coating structure and its preparation method applied in the technical field of high-temperature coating preparation for aero-engines and ground gas turbines. Barrier coating structures for high temperature environments include:

[0030] The Gd layered on the surface of SiC / SiC composite matrix sequentially 2 o 3 Doped Si bonding underlayer, Gd 2 SiO 5 middle layer and Yb 2 SiO 5 Surface layer. Specifically, such as figure 1 A schematic diagram of the structure of a high-temperature environment barrier coating provided by the embodiment of the present invention, the coating structure is composed of SiC / SiC composite material part substrate 1, vacuum plasma spraying Gd 2 o 3 Doped Si bonding bottom layer 2, vacuum plasma spraying Gd 2 SiO 5 Intermediate layer 3 and vacuum plasma spra...

Embodiment 1

[0046] Spraying Gd on cleaned SiC / SiC composite parts by vacuum plasma spraying process 2 o 3 Doped with Si to bond the bottom layer, the vacuum plasma spraying power is 35KW, the spraying distance is 260mm, and the thickness of the bonded bottom layer is controlled within the range of 0.10mm to 0.15mm.

[0047] in Gd 2 o 3 Preparation of Gd on Doped Si Adhesive Underlayer by Vacuum Plasma Spraying Process 2 SiO 5 For the middle layer, the vacuum plasma spraying power is 50KW, the spraying distance is 220mm, and the thickness of the middle layer is controlled within the range of 0.15mm to 0.20mm.

[0048] in Gd 2 SiO 5 Yb was prepared by vacuum plasma spraying process on the intermediate layer 2 SiO 5 For the surface layer, the vacuum plasma spraying power is 50KW, the spraying distance is 220mm, and the thickness of the surface layer is controlled within the range of 0.15mm to 0.25mm.

Embodiment 2

[0050] Spraying Gd on cleaned SiC / SiC composite parts by vacuum plasma spraying process 2 o 3 Doped with Si to bond the bottom layer, the vacuum plasma spraying power is 38KW, the spraying distance is 240mm, and the thickness of the bonded bottom layer is controlled within the range of 0.10mm-0.15mm.

[0051] in Gd 2 o 3 Preparation of Gd on Doped Si Adhesive Underlayer by Vacuum Plasma Spraying Process 2 SiO 5 For the middle layer, the vacuum plasma spraying power is 52KW, the spraying distance is 200mm, and the thickness of the middle layer is controlled within the range of 0.15mm-0.20mm.

[0052] in Gd2 SiO 5 Yb was prepared by vacuum plasma spraying process on the intermediate layer 2 SiO 5 For the surface layer, the vacuum plasma spraying power is 52KW, the spraying distance is 200mm, and the thickness of the surface layer is controlled within the range of 0.15mm-0.25mm.

[0053] In the above-mentioned scheme, the environmental barrier coating in the present inven...

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Abstract

The invention provides a high-temperature environment barrier coating layer structure and a preparation method thereof. The structure comprises a Gd2O3 doped Si bonding bottom layer, a Gd2SiO5 middlelayer and a Yb2SiO5 surface layer laminated on the surface of a SiC / SiC composite material basal body in sequence. An environment barrier coating layer is of a three-layer structure of vacuum plasma spraying gadolinium oxide doped Si bonding bottom layer+vacuum plasma spraying gadolinium silicate middle layer+vacuum plasma spraying ytterbium silicate surface layer. A Gd2SiO5 coating layer and a Yb2SiO5 coating layer are prepared by adopting a vacuum plasma spraying process; components of the coating layers are maintained well; the material component loss and the silicate decomposition are hardly generated; the phase composition is stable; and the thermal shock resistance of the coating layers is excellent. The physical performance matchability of all the layers is excellent to effectivelyrelieve the thermal stress of the coating layers; the working temperature can reach 1400 DEG C; and the thermal shock resistance, the thermal circulation resistance and the service life of the environment barrier coating layer are greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparation of high-temperature coatings for aero-engines and ground gas turbines, in particular to a high-temperature environment barrier coating structure and a preparation method thereof. Background technique [0002] SiC fiber-reinforced SiC composites (SiC / SiC) have the advantages of light weight, high structural strength, high temperature resistance, oxidation resistance, and erosion resistance. As a high-temperature thermal structural material, it has important applications in the fields of aeroengines and ground gas turbines. However, in the gas environment of high-temperature water vapor of the engine and the temperature is higher than 1300 ° C, the SiC / SiC composite material is easily corroded by water vapor, which seriously degrades the performance of the SiC / SiC material and even fails the material. SiC / SiC composite materials for thermal protection. [0003] At present, the environmental bar...

Claims

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Application Information

Patent Timeline
07 Dec 2018
Publication
CN108950463A
IPC
C23C4/134; C23C4/11; C23C4/10
CPC
C23C4/10; C23C4/11; C23C4/134
Inventors
李其连; 李淑青