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A kind of preparation method of thermal barrier coating spray powder based on target coating phase structure and short flow plasma physical vapor deposition

A physical vapor deposition, target coating technology, applied in chemical instruments and methods, coatings, metal material coating processes, etc., can solve the problems of difficult to effectively control powder properties, difficult to sieve, and the strength cannot be too high. Achieve the effect of improving resource utilization efficiency, low cost, and improved deposition efficiency

Active Publication Date: 2020-10-16
BEIJING GOLDEN WHEEL SPECIAL MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The currently reported process for the powder needs to go through a screening process. Since the fine powder (generally 1-30 μm) used in the PS-PVD process is mechanically screened, even if it is coupled with ultrasonic vibration, it is difficult. Screening; at the same time, PS-PVD powder is required to have a certain agglomeration strength, and at the same time, the strength should not be too high to avoid melting and gasification during sintering in plasma. There are also problems such as secondary crushing of powder particles caused by the screening process in airflow screening. It is difficult to effectively control the powder characteristics to ensure the requirements of the process

Method used

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  • A kind of preparation method of thermal barrier coating spray powder based on target coating phase structure and short flow plasma physical vapor deposition
  • A kind of preparation method of thermal barrier coating spray powder based on target coating phase structure and short flow plasma physical vapor deposition
  • A kind of preparation method of thermal barrier coating spray powder based on target coating phase structure and short flow plasma physical vapor deposition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) slurry preparation:

[0039] ① Weigh gadolinium zirconate (chemical formula: Gd 2 Zr 2 o 7 ) powder 2Kg, the D50 of the raw material is 50 μm, which is fine powder and coarse powder re-screened by plasma spraying powder, the powder is prepared through agglomeration and sintering, and the phase structure of the raw material powder is a pyrochlore structure;

[0040] ② The solid content of the configuration is 20%, divided into 1Kg powder and ball milled, respectively adding 1% phenolic resin to the respective slurry as a binder (the viscosity of the pure aqueous solution at this concentration is 1mPa·s),

[0041] ③Part of the slurry is ball milled at 300rpm using a stirring ball mill for 1h until D 50 0.15μm, D 75 0.28μm; the other part is milled at the relevant ball milling speed of 300rpm and ball milled for 15min. The particle size of the powder particles in the slurry is characterized by D50 being 3μm and D90 being 10μm;

[0042] ④Mix the above-mentioned slu...

Embodiment 2

[0053] (1) slurry preparation:

[0054] ①Weigh 8YSZ powder (6~8wt.%Y 2 o 3 Partially stabilized ZrO 2 Powder, the powder is a single metastable tetragonal phase structure (consistent with the target preparation coating phase structure), smelting and crushing powder) 5Kg, and the average particle size of the powder is 25 μm;

[0055] ② Divide the powder raw material into two parts of equal weight, add pure water to control the solid content to 60%, add 2% phenolic resin of the powder mass as a binder, the binder is dissolved in pure water at a concentration of 2%, and the viscosity of the solution is 2.1 mPa s;

[0056] ③ A part of ball milling to the powder particle size D in the slurry 50 0.1μm, D 75 0.23μm; the other part is ball milled to the powder particle D in the slurry 50 6μm, D 90 9.9 μm;

[0057] ④Mix the above-mentioned slurry with the same solid content and stir evenly. The viscosity of the slurry is 8mPa·s. After the slurry is uniformly stirred, the partic...

Embodiment 3

[0069] (1) slurry preparation:

[0070] ① Weigh lanthanum cerate (chemical formula: La 2 Ce 2 o 7 ) powder 4Kg, the D50 of the raw material is 42 μm, which is a nano-agglomerated sintered powder, and the phase structure of the raw material powder is; fluorite phase.

[0071] ② The solid content of the configuration is 40%, which is divided into 2Kg powder ball mills, and 1.5% phenolic resin is added to the respective slurries as a binder (the viscosity of the pure aqueous solution at this concentration is 1.6mPa·s),

[0072] ③Part of the slurry is ball milled at 250rpm with a stirring ball mill for 1.5h until D 50 0.14μm, D 75 0.25 μm; the other part is milled at a relevant ball mill speed of 250 rpm for 40 minutes, and the particle size of the powder in the slurry is characterized by D50 being 4.5 μm and D90 being 8.7 μm;

[0073] ④Mix the above-mentioned slurry with the same solid content and stir evenly. The viscosity of the evenly stirred slurry is 40mPa·s. After unif...

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Abstract

The invention discloses a preparation method of thermal barrier coating spraying powder based on a target coating phase structure and short process plasma spraying-physical vapour deposition (PS-PVD).The method adopts powder, which is obtained by treating solid-phase synthesis or chemical synthesis powder with a structure the same as that of the coating phase, as a raw material; fine agglomeratedspherical powder is prepared by short flow of slurry preparation, spray drying and drying, wherein a two-fluid atomization or four-fluid atomization pressure atomization way is adopted in spray drying, the powder crushing strength is within a range of 1-6 MPa, the interior of the powder has higher microporous distribution, and the powder is of a typical loose agglomerated structure; the method has the advantage of being very short in flow, and can be used for obtaining the powder, which can be stably transported and is high in rate of gasification during a technological process, by three steps of slurry preparation, spray drying and drying; and furthermore, by controlling slurry concentration, viscosity as well as key parameters such as key dimensions, temperature and pressure of an atomizer in an atomization process, the controllable preparation of the micro-structure and specific powder can be realized.

Description

technical field [0001] The invention relates to a method for preparing powder for thermal barrier coatings for plasma physical vapor deposition, more particularly, using powders with the same phase structure as the target coating, and controlling the powder particle size range, atomization form and fog in the slurry The chemical equipment structure, the key parameters in the atomization process, etc., realize the rapid preparation of porous, thick and fine particle composite, and high deposition efficiency spray powder, and realize the extremely short process preparation of spray powder for this process. Background technique [0002] Thermal Barrier Coating (TBC) is one of the three key manufacturing technologies for high-pressure turbine blades of gas turbine engines, and is an indispensable thermal protection technology for modern high-performance gas turbine engines. At present, the thermal barrier coating preparation technologies that have been applied in batches mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/00C23C26/00
CPCC01G25/00C01P2004/61C01P2006/10C23C26/00
Inventor 何箐由晓明邹晗
Owner BEIJING GOLDEN WHEEL SPECIAL MACHINE
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