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A kind of ysz-rare earth zirconate thermal barrier coating with gradient structure and its preparation method

A technology of thermal barrier coating and gradient coating, which is applied in coating, metal material coating process, fusion spraying, etc., and can solve the problems of blocking oxygen permeability, instability, and poor fracture toughness

Inactive Publication Date: 2019-10-15
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent (publication number CN103668191A) uses magnetron sputtering to deposit a 5-30 μm aluminum film on the surface of the YSZ ceramic layer prepared by EB-PVD, and vacuum heat-treats the thermal barrier coating with the aluminum film to form a layer on the surface. A dense layer of alumina blocks the permeability of oxygen, but this layer of alumina often contains many unstable components such as γ-Al 2 o 3 and δ-Al 2 o 3
Chinese patent (publication number CN102070335A) discloses a kind of rare earth zirconate material system with pyrochlore structure that can be used for thermal barrier coatings. The materials provided have low thermal conductivity, high thermal stability and high temperature sintering resistance, but simple The rare earth zirconate material has poor fracture toughness as a ceramic layer, and will react with the bonding layer to form aluminate, which will affect the service life

Method used

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  • A kind of ysz-rare earth zirconate thermal barrier coating with gradient structure and its preparation method
  • A kind of ysz-rare earth zirconate thermal barrier coating with gradient structure and its preparation method
  • A kind of ysz-rare earth zirconate thermal barrier coating with gradient structure and its preparation method

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Embodiment 1

[0027] A multilayer gradient thermal barrier coating and a preparation method thereof, comprising the following steps:

[0028] (1) Substrate surface treatment: soak the cobalt-based superalloy substrate in NaOH solution for degreasing treatment, perform ultrasonic cleaning with ethanol, dry and clean the superalloy substrate, and then spray the treated superalloy substrate surface sand coarsening;

[0029] (2) Feed mixing ball mill: use plasma-densified spherical 8YSZ powder and sintered crushed La 2 Zr 2 o 7 The powders are respectively by mass percentage 8YSZ: rare earth zirconate (=100%8YSZ, 80%: 20%, 60%: 40%, 40%: 60%, 20%: 80%, 100% La 2 Zr 2 o 7 ) Weigh and mix as the gradient raw material, then add 40wt% alcohol, put it into a ball mill for ball milling, the ball milling speed is 150rpm, and the ball milling time is 8h;

[0030] (3) Powder drying: After mixing, dry the above 6 parts of slurry at 80°C for 4 hours to obtain feed powder.

[0031] (4) Thermal spray...

Embodiment 2

[0041] A multilayer gradient thermal barrier coating and a preparation method thereof, comprising the following steps:

[0042] (1) Substrate surface treatment: Soak the nickel-based superalloy substrate in NaOH solution for degreasing treatment, perform ultrasonic cleaning with ethanol, dry and clean the superalloy substrate, and then spray the treated superalloy substrate surface sand coarsening;

[0043] (2) Feed mixing ball mill: use plasma-densified spherical 8YSZ powder with powder particle sizes of 60 μm and 40 μm respectively and sintered crushed Gd 2 Zr 2 o 7 Powder respectively by mass percentage 8YSZ:Gd 2 Zr 2 o 7 (=100%8YSZ, 80%: 20%, 60%: 40%, 40%: 60%, 20%: 80%, 100% Gd 2 Zr 2 o 7 ) Weigh and mix as the gradient raw material, then add 40wt% alcohol, put it into a ball mill for ball milling, the ball milling speed is 150rpm, and the ball milling time is 8h;

[0044] (3) Powder drying: After mixing, dry the above 6 parts of slurry at 80°C for 4 hours to ob...

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Abstract

The invention provides an YSZ-rare earth zirconate thermal barrier coating of a gradient structure and a preparation method thereof. The coating material comprises an adhesive layer, an 8YSZ-rare earth zirconate gradient layer and a surface layer. The 8YSZ-rare earth zirconate material has relatively low conductivity, high-temperature sintering resistance and excellent resistance to heat shocks, and also can prevent oxygen from entering the adhesive layer on active service to alleviate oxidization of the adhesive layer to form TGO. The heat mismatching stress of the material can be reduced bymeans of an optimized design of the gradient structure, so that the heat stability of the whole material member is improved; the surface layer is a CMAS corrosion layer, so that the problem that an existing YSZ coating is corroded by CMAS can be alleviated. As Pd or a oxide ceramic layer is adopted, CMAS molten at a high temperature is not wet in the surface layer, and the rolling angle is small,and CMAS is hardly attached to the surface of the coating, so that CMAS corrosion is avoided.

Description

technical field [0001] The invention relates to a YSZ-rare earth zirconate thermal barrier coating with gradient structure and a preparation method. Background technique [0002] With the development of aero-engines towards higher thrust-to-weight ratios, the inlet temperature of the engines continues to increase, reaching 1700°C. The operating temperature of high-temperature components such as blades also reaches about 1200 °C, which is much higher than the operating temperature (1000 °C) that advanced nickel-based superalloys can withstand. Therefore, the use of thermal barrier coating technology is the only practical way to greatly increase the operating temperature of aero-engines. At present, the most widely used thermal barrier coating material is yttria partially stabilized zirconia. As a thermal barrier coating material, 8YSZ has many incomparable advantages, but 8YSZ will undergo phase transition at around 1200 °C, resulting in phase transition stress, and Accompa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/10C23C4/08C23C4/073
Inventor 李强虞志轩何柯谈耀宏
Owner FUZHOU UNIV
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