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A kind of thermal barrier coating with anti-particle scour surface layer and preparation method thereof

A technology of thermal barrier coating and surface layer, applied in coating, metal material coating process, melt spraying and other directions, can solve complex multi-process, multi-process preparation problems, affect coating performance and life, separation and peeling, etc. problem, to achieve the effect of improving the anti-particle erosion performance, long time and many production processes

Active Publication Date: 2020-12-18
GUANGDONG INST OF NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And these interlayer interfaces will become the weak link of coating adhesion, thermal stability and chemical stability. When the coating is hit by particles, it is most likely to initiate cracks at these interfaces, or even separate and fall off, affecting the performance and life of the coating. It brings very complicated multi-process and multi-process preparation problems, and the cost is greatly increased

Method used

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  • A kind of thermal barrier coating with anti-particle scour surface layer and preparation method thereof
  • A kind of thermal barrier coating with anti-particle scour surface layer and preparation method thereof
  • A kind of thermal barrier coating with anti-particle scour surface layer and preparation method thereof

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Embodiment 1

[0024] In this embodiment, superalloy K417G is selected as the base material, and the total coating thickness is designed to be 300 μm, among which the high cohesive strength surface layer is designed to be 50 μm. The thermal barrier coating ceramic layer is made of yttria-stabilized zirconia (YSZ) ceramic powder (agglomerated spherical powder, particle size -30+1 μm, composition as shown in the table below).

[0025] Element ZrO2 Y2O3 HfO2 binder Impurities weight percentage margin 7.5 <2.5

1 <0.1

[0026] Concrete preparation process is as follows:

[0027] In the first step, the surface of the substrate is ground and polished, and the alcohol is ultrasonically cleaned to keep the surface clean;

[0028] The second step is to prepare a ceramic layer on the substrate, the specific steps are as follows:

[0029] (1) Fix the substrate on the workpiece moving table in the vacuum chamber;

[0030] (2) Close the vacuum chamber, evacuate, k...

Embodiment 2

[0039] In this embodiment, the directionally solidified superalloy DZ40M is selected as the substrate, the total coating thickness is designed to be 350 μm, and the anti-particle erosion surface layer is designed to be 70 μm. The material of the thermal barrier coating ceramic layer is yttria stabilized zirconia YSZ.

[0040] Concrete preparation process is as follows:

[0041] In the first step, the surface of the substrate is ground and polished, and the alcohol is ultrasonically cleaned to keep the surface clean;

[0042] The second step is to prepare a ceramic layer on the substrate, the specific steps are as follows:

[0043] (1) Fix the substrate on the workpiece moving table in the vacuum chamber;

[0044] (2) Close the vacuum chamber, evacuate, keep the dynamic pressure of the vacuum chamber equal to 150Pa, and ventilate the vacuum chamber at 1.5L / min;

[0045] (3) Feed in the ceramic layer powder, and the plasma flame flow containing the ceramic layer material swee...

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Abstract

The invention discloses a thermal barrier coating layer with a particle scouring resistant surface layer and a preparation method thereof. The thermal barrier coating layer is a ceramic layer with a feather structure and arranged on a basal body by adopting a plasma spraying-physical vapor deposition process; the upper end part of the ceramic layer is a high-cohesion-strength surface layer; the part, below the high-cohesion-strength surface layer, of the ceramic layer is in no-interface connection with the high-cohesion-strength surface layer; and the high-cohesion-strength surface layer has the same material components, object phases and macroscopic feather structures with the ceramic layer below the surface layer. The thermal barrier coating layer is simple in process, low in cost and high in coating bonding strength; and the prepared thermal barrier coating layer with the high-cohesion-strength surface layer can greatly improve the particle scouring resistance, and is long in service life.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coatings, and relates to a thermal barrier coating with a particle erosion-resistant surface layer and a preparation method thereof. Background technique [0002] Thermal barrier coatings (TBCs) use the superior high temperature resistance, corrosion resistance and low thermal conductivity of ceramic materials to combine ceramics and metal substrates in the form of coatings to improve the service temperature and high temperature oxidation resistance of hot end components and prolong Service life of hot end components, a surface protection technology to improve engine efficiency. At present, the structure of thermal barrier coatings mainly includes lamellar structure and columnar crystal structure. The former is mainly used on low temperature or static parts. The coating and the substrate are mechanically bonded, and the bonding strength is average. The coating is prone to premature peelin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11
CPCC23C4/11C23C4/134
Inventor 毛杰刘敏邓畅光邓春明宋进兵邓子谦牛少鹏周克崧
Owner GUANGDONG INST OF NEW MATERIALS
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