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Preparation method of fully-stable tetragonal YSZ target material and ultra-long-life EB-PVD coating

A super-long-life, fully-stabilized technology, applied in the coating process of metal materials, coatings, manufacturing tools, etc., can solve the problems of insufficient life, uneven distribution of stabilizers, etc., and achieve uniform thermal stress release and small grain size , to ensure the effect of uniformity

Active Publication Date: 2022-04-12
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems in the above-mentioned target preparation process, the present invention adopts the pure phase YSZ powder prepared in the patent CN107815633A, and increases the specific surface area of ​​the powder through the method of grading ball milling and sand milling, thereby improving its sintering activity and solving the problem of YSZ from the source. The phenomenon of uneven distribution of target stabilizers, based on solving the existing problems of YSZ ceramic target materials such as non-100% tetragonal phase structure and insufficient service life during use, proposes an ultra-high temperature barrier coating for electron beam physical vapor deposition Full-stable tetragonal YSZ target with lifetime and its preparation method

Method used

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  • Preparation method of fully-stable tetragonal YSZ target material and ultra-long-life EB-PVD coating
  • Preparation method of fully-stable tetragonal YSZ target material and ultra-long-life EB-PVD coating
  • Preparation method of fully-stable tetragonal YSZ target material and ultra-long-life EB-PVD coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A preparation method of a fully stabilized tetragonal YSZ target for ultra-long-life EB-PVD coating, comprising the following steps:

[0048] Step 1. Use Zr(NO) with a purity of 99.99% 3 ) 4 ·3H 2 O and Y (NO 3 ) 3 ·6H 2 O is the raw material, the molar ratio Zr (NO 3 ) 4 ·3H 2 O:Y(NO 3 ) 3 ·6H 2 O=0.92:0.08 ingredients, using deionized water as solvent to prepare an aqueous solution with a total concentration of metal ions of 0.2mol / L, magnetic stirring for 1-3h until clear and transparent, then adding additive citric acid hexahydrate and molecular weight of 20000 160g / L of citric acid, 20g / L of polyethylene glycol, and then magnetically stirred to become clear and transparent to obtain a sol; the sol was atomized into a corundum crucible by a pressure atomization method, The atomization pressure was 0.3MPa, and the temperature of the corundum crucible was 500°C; after the sol atomization was completed, the temperature of the corundum crucible was raised to ...

Embodiment 2

[0059] A preparation method of a fully stabilized tetragonal YSZ target for ultra-long-life EB-PVD coating, comprising the following steps:

[0060] Step 1. Use Zr(NO) with a purity of 99.99% 3 ) 4 ·3H 2 O and Y (NO 3 ) 3 ·6H 2 O is the raw material, the molar ratio Zr (NO 3 ) 4 ·3H 2 O:Y(NO 3 ) 3 ·6H 2 O=0.92:0.08 ingredients, using deionized water as solvent to prepare an aqueous solution with a total concentration of metal ions of 0.2mol / L, magnetic stirring for 1-3h until clear and transparent, then adding additive citric acid hexahydrate and molecular weight of 20000 160g / L of citric acid, 20g / L of polyethylene glycol, and then magnetically stirred to become clear and transparent to obtain a sol; the sol was atomized into a corundum crucible by a pressure atomization method, The atomization pressure was 0.3MPa, and the temperature of the corundum crucible was 500°C; after the sol atomization was completed, the temperature of the corundum crucible was raised to ...

Embodiment 3

[0076] A fully stable tetragonal YSZ target prepared in Example 1 is used to prepare an ultra-long-life EB-PVD coating, including: a substrate whose surface coating is a double-layer structure composed of an adhesive layer and a ceramic layer; the ceramic layer adopts The EB-PVD coating spraying process sprays a fully stable tetragonal YSZ target. The spraying process parameters are: substrate heating current 0.2A; heating ingot current 1.3A; substrate temperature 900°C; power 25kW; rotation speed 13r / min; vacuum degree 10 -3 Pa; the substrate is a nickel-based superalloy DD5 with a diameter of 25.4 mm and a thickness of 5 mm; the preparation method of the bonding layer is: after plating Pt on the substrate, it is treated at 1050° C. for 2 hours, and a diffusion layer is formed together with Ni in the substrate; 1080 ℃ gas phase infiltration of Al for 5h, and then heat treatment by two-step diffusion method, that is, heating at 1100℃ for 1h and then heating at 875℃ for 16h.

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Abstract

The invention discloses a preparation method of a fully-stable tetragonal YSZ target material and an ultra-long-life EB-PVD coating. The preparation method comprises the following steps: adding fully-stable tetragonal YSZ powder, zirconium oxide balls, a PVA1799 aqueous solution, n-caprylic alcohol, ammonium citrate and water into a ball milling tank for ball milling; sanding and drying the ball-milled slurry on a sand mill; adding the dry powder into a ball milling tank, adding zirconium oxide balls and water, and carrying out ball milling, dry milling, drying and screening; adding into an acid and alkali resistant plastic barrel, and aging in a shady, cool, ventilated and dry place; filling the mixture into a mold, compacting, and performing low-pressure forming to obtain a green body; carrying out cold isostatic pressing on a green body obtained by low-pressure forming to obtain a green body with higher density, and drying; and sintering the dried green body to obtain the fully-stable tetragonal YSZ target material for the electron beam physical vapor deposition thermal barrier coating. The fully-stable tetragonal YSZ target material is of a 100% tetragonal phase, the concentration of YO1.5 is 7-8.7 mol%, the density is 3.4-4.2 g / cm < 3 >, the target material has no obvious defects such as cracks and holes, the fracture of the target material is uniform, and the sizes and distribution of microscopic pores are uniform.

Description

technical field [0001] The invention relates to a fully stable tetragonal YSZ target material for electron beam physical vapor deposition thermal barrier coating and a preparation method of the ultra-long-life EB-PVD coating. Background technique [0002] Thermal barrier coatings are widely used in gas turbine engines and aero-engines to increase intake air temperature, resulting in higher thrust ratio and energy; in addition, it can also provide thermal protection for hot end components of gas turbine engines, making them more resistant to oxidation , corrosion resistance, thereby helping to extend the service life of the engine. At present, the most widely used and mature thermal barrier coating preparation technologies are atmospheric plasma spraying (APS) and electron beam physical vapor deposition (EB-PVD). EB-PVD coatings are mainly used in engine rotor blades. The EB-PVD coating has a feather-like columnar crystal microstructure with vertical spacing, good strain tol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/622C04B35/626B28B3/00C23C14/30C23C14/08C23C14/02
CPCY02T50/60
Inventor 王欣江阔薛敏王杰赖晓萍
Owner SOUTHWEAT UNIV OF SCI & TECH
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