Preparation method of ceramic target material for thermal barrier coating with high uniformity and short flow electron beam physical vapor deposition

A physical vapor deposition and thermal barrier coating technology, which is applied in the field of preparing ceramic targets for electron beam physical vapor deposition thermal barrier coatings, can solve the problems of reduced thermal shock resistance of ceramic targets and reduced stability of deposition process, etc. Achieving good thermal stress release capability, good sphericity and fluidity, and moderate density

Active Publication Date: 2020-12-15
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the sintering process can improve the target strength, the sintering will cause the thermal shock resistance of the ceramic target to decrease, and the closed-cell degassing during the evaporation process will also lead to a decrease in the stability of the deposition process

Method used

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  • Preparation method of ceramic target material for thermal barrier coating with high uniformity and short flow electron beam physical vapor deposition
  • Preparation method of ceramic target material for thermal barrier coating with high uniformity and short flow electron beam physical vapor deposition
  • Preparation method of ceramic target material for thermal barrier coating with high uniformity and short flow electron beam physical vapor deposition

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] first step:

[0077] Using chemically synthesized yttria partially stabilized zirconia (6-8YSZ) raw material, the raw material purity is 99.93%, the remaining impurity content is 0.07wt%, the average grain size of the raw material is 0.05μm, and the raw material state is the slurry spray-dried material after synthesis.

[0078]Weigh a certain amount of raw material powder, according to the solid content of 40%, add pure water to the raw material to prepare a slurry, and perform ball milling. Add 0.1% polyvinyl alcohol during the ball milling process. After the ball milling, use a laser particle size analyzer to test the slurry Material D 50 It is 0.15 μm, and the viscosity of the slurry after ball milling is 90 mPa·S using a viscometer. Use high-speed centrifugal spray drying equipment to agglomerate and granulate the slurry. After granulation, the powder is dried at 100°C for 5 hours, and the dried powder is sieved to 10-120 μm to obtain powder A and the cross-section...

Embodiment 2

[0091] first step:

[0092] The chemically synthesized yttria partially stabilized zirconia (6-8YSZ) raw material is used, the raw material purity is 99.92%, the remaining impurity content is 0.08wt%, the average grain size of the raw material is 0.05 μm, and the raw material state is a slurry spray-dried material after synthesis.

[0093] Weigh a certain amount of raw material powder, according to the solid content of 50%, add pure water to the raw material to prepare a slurry, and perform ball milling. Add 0.5% polyvinyl alcohol during the ball milling process. After the ball milling, use a laser particle size analyzer to test the slurry Material D 50 It is 0.12 μm, and the viscosity of the slurry after ball milling is 85 mPa·S using a viscometer. Use high-speed centrifugal spray drying equipment to spray dry the slurry. After granulation, the powder is dried at 100°C for 5 hours, and the dried powder is sieved to 10-120 μm to obtain powder A. The bulk density of powder A i...

Embodiment 3

[0104] first step:

[0105] The chemically synthesized gadolinium zirconate (GZO) raw material is used, the raw material purity is 99.91%, the remaining impurity content is 0.09wt%, the average grain size of the raw material is 0.05 μm, and the raw material state is a slurry spray-dried material after synthesis.

[0106] Weigh a certain amount of raw material powder, according to the solid content of 47%, add pure water to the raw material to prepare a slurry, and perform ball milling. During the ball milling process, add 0.4% polyvinyl alcohol. After the ball milling, use a laser particle size analyzer to test the slurry Material D 50 It is 0.12 μm, and the viscosity of the slurry after ball milling is 85 mPa·S using a viscometer. Use high-speed centrifugal spray drying equipment to spray dry the slurry. After granulation, the powder is dried at 100°C for 4 hours, and the dried powder is sieved to 10-120 μm to obtain powder A. The bulk density of powder A is 1.05 g / cm 3 , ...

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Abstract

The invention provides a preparation method for a high-uniformity, short-process ceramic target material for electron beam physical vapor deposition thermal barrier coating, which comprises the following steps: agglomerative granulation of powdery material, heat treatment of agglomeratively granulated powder, proportioned mixing of powders, cold isostatic pressing and binder removal treatment. Theceramic target material prepared by the preparation method has the advantages of short technological process, easiness in processing and the like, and the prepared target material has excellent thermal shock resistance, thus guaranteeing the technological stability of electron beam physical vapor deposition. According to technological requirements, sintering treatment can also be carried out to obtain a high-density, high-strength ceramic target material after the binder of green bodies is removed.

Description

technical field [0001] The invention relates to a method for preparing a ceramic target material for electron beam physical vapor deposition thermal barrier coating, in particular to a method for preparing a ceramic target material for electron beam physical vapor deposition thermal barrier coating by a non-sintering or low-temperature sintering process. Background technique [0002] Thermal barrier coating technology is one of the three key technologies of high-performance gas turbine engines and aero-engines, and an indispensable key technology in their manufacture. The thermal barrier coating consists of an oxidation-resistant, corrosion-resistant bonding layer and a corrosion-resistant, high-insulation ceramic layer. At present, the preparation technologies of thermal barrier coating ceramic layers that have been successfully applied are mainly atmospheric plasma spraying (APS) and electron beam physical vapor deposition (EB-PVD). The columnar crystal structure ceramic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/626C04B35/48C04B35/50
CPCC04B35/48C04B35/50C04B35/622C04B35/62645C04B35/62695C04B2235/3225C04B2235/602C04B2235/608C04B2235/77C04B2235/786
Inventor 何箐邹晗王世兴
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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