Multi-component rare earth oxide-doped modified YSZ thermal spraying powder and preparation method thereof

A rare earth oxide, spray powder technology, applied in coating, melting spraying, metal material coating process and other directions, can solve the problem of low solid solution degree of rare earth elements, reduce thermal conductivity, improve powder fluidity, Effect of Gas Thermal Shock Life Improvement

Active Publication Date: 2017-02-08
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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Problems solved by technology

[0007] Aiming at the problems existing in the prior art, the present invention proposes a thermal spraying multinary rare earth oxide doped modified YSZ powder and a preparation method thereof to solve the problems in the prior art multinary rare earth oxide doped modified YSZ powder preparation method. Defects of low solid solubility of rare earth elements

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  • Multi-component rare earth oxide-doped modified YSZ thermal spraying powder and preparation method thereof
  • Multi-component rare earth oxide-doped modified YSZ thermal spraying powder and preparation method thereof
  • Multi-component rare earth oxide-doped modified YSZ thermal spraying powder and preparation method thereof

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preparation example Construction

[0037] The present invention proposes a preparation method of multi-element rare earth oxide doped modified YSZ spray powder, comprising:

[0038] Step 1: Take the raw material powder that meets the requirements according to the solid content and the amount of one-time ball milling treatment. Y in the raw material 2 o 3 The content is 5.5~6.5wt%, Gd 2 o 3 The content is 2.5~3wt%, Yb 2 o 3 The content is 2.5~3.5wt%, ZrO 2 -HfO 2 The total amount is 87~89.5wt%, HfO 2 Content is ≤2wt%, HfO 2 ZrO 2 Associated materials;

[0039] Step 2: Slurry preparation: use a stirring ball mill to prepare slurry under the condition of 45-55% solid content, and use 0.1% PVA as a binder to obtain a uniformly dispersed slurry. In order to avoid large aggregate residues, the slurry The material passes through a 20-mesh standard sieve;

[0040] Step 3: Agglomeration and granulation: Use a high-speed centrifugal spray drying system to perform spray drying and granulation treatment at the s...

Embodiment 1

[0061] The first step: Prepare qualified modified YSZ raw material powder, the average particle size of the original powder is 152nn, Y in the raw material 2 o 3 Content is 6.5%, Gd 2 o 3 Content is 2.5%, Yb 2 o 3 Content is 2.5%, ZrO 2 -HfO 2 Total amount (HfO 2 ZrO 2 Associated material) is 88.41%, HfO 2 The content is 1.78%, and the content of other impurities except rare earth elements is 0.09%. The raw material powder has a mixed structure of tetragonal phase and cubic phase.

[0062] The second step: slurry preparation: mix the raw material powder and pure water, prepare a slurry with a solid content of 55%, and use a stirring ball mill for ball milling, equipped with zirconia balls of mixed sizes, the ball mill is lined with polyurethane, and the ball mill speed 350rpm, ball milling time is 4h, add 0.1% PVA as a binder in the last 10 minutes of ball milling, after ball milling is completed, the slurry is passed through a 20-mesh standard sieve and poured into t...

Embodiment 2

[0070] The first step: Prepare qualified modified YSZ raw material powder, the average particle size of the original powder is 130nn, Y in the raw material 2 o 3 Content is 5.5%, Gd 2 o 3 Content is 3%, Yb 2 o 3 Content is 3.5%, ZrO 2 -HfO 2 Total amount (HfO 2 ZrO 2 Associated material) is 87.91%, HfO 2 The content is 1.52%, the total amount of impurities except the remaining rare earth elements is 0.089%, and the raw material powder has a mixed structure of tetragonal phase and cubic phase. .

[0071] The second step: slurry preparation: mix the raw material powder and pure water, prepare a slurry with a solid content of 45%, and use a stirring ball mill for ball milling, equipped with zirconia balls of mixed sizes, the ball mill is lined with polyurethane, and the ball mill speed is 300rpm, the ball milling time is 2h, no binder is added (the binder content is 0%), after the ball milling is completed, the slurry is poured into the mixing tank after passing through...

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Abstract

The invention discloses a multi-component rare earth oxide-doped modified YSZ thermal spraying powder and a preparation method thereof. A coating prepared by the above powder is obviously improved in high-temperature phase stability and resistance to high-temperature sintering performance, compared with that of the conventional 8 YSZ material. The Gd2O3-Yb2O3-Y2O3-ZrO2(HfO2) power provided in the invention is composed of 5.5-6.5 wt% of Y2O3, 2.5-3 wt% of Gd2O3, 2.5-3.5 wt% of Yb2O3, 87-89.5 wt% of ZrO2-HfO2, and 2 wt% or less of HfO2, wherein HfO2 is the associated material of the ZrO2. Raw materials are prepared through subjecting the slurry to the sparying, drying, agglomerating, granulating, drying, sieving, high-temperature calcination, plasma densification treatment, drying and sieving process. In this way, the loose density of obtained spherical thermal spraying powders is 1.8-2.3 g / cm<3>, and the fluidity of obtained spherical thermal spraying powders is smaller than 50s / 50g, wherein most of the obtained spherical thermal spraying powders are in metastable tetragonal phase. The powder is prepared through multiple different heat treatment means, so that the high-temperature stability and the performance of the spraying powder and the sprayed coating are improved. Meanwhile, the heat-shock life of a plasma sprayed coating prepared by the above powder is up to over 2300 times at 1200 DEG C, and is far higher than that of a 8 YSZ coating in the same condition.

Description

technical field [0001] The invention relates to a method for preparing high-performance thermal spraying thermal barrier coating ceramic layer powder. Background technique [0002] Thermal barrier coating (Thermal Barrier Coating, TBC) is widely used on the surface of gas turbine engine hot end parts, it has good heat insulation, high temperature oxidation and corrosion resistance, and will significantly improve the service temperature and service life of hot end parts. Due to the pursuit of higher thermal efficiency or thrust-to-weight ratio of modern gas turbine engines, the temperature before the turbine continues to increase. At present, the temperature before the turbine of advanced gas turbine engines has reached 1400°C. Even with advanced cooling structure design technology, the surface temperature of high-pressure turbine blades exceeds that of alloy The blades must be protected with thermal barrier coating technology due to the high operating temperature. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/48C04B35/626C04B35/64C23C4/11
CPCC04B35/48C04B35/6261C04B35/62645C04B35/62695C04B35/64C04B2235/3224C04B2235/3225C04B2235/3246C04B2235/6562
Inventor 何箐
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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