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High-performance Sc-Y-co-doped zirconium oxide thermal protection coating and preparing method thereof

A technology of co-doping and zirconia, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of short thermal cycle life, low fracture toughness or thermal expansion coefficient, low thermal conductivity, etc., to achieve Low thermal conductivity, reduced thermal conductivity, good phase stability at high temperature

Pending Publication Date: 2019-06-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Pyrochlore-structured M 2 Zr 2 o 7 (M=La, Y, Gd and other rare earth elements), La 2 Ce 2 o 7 (LC) and LaMgAl 11 o 19 New materials with complex structures such as (LMA) have a stable high-temperature phase structure and low thermal conductivity, but their fracture toughness or thermal expansion coefficient are also low, and the thermal cycle life is very short when a single material is used.

Method used

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  • High-performance Sc-Y-co-doped zirconium oxide thermal protection coating and preparing method thereof
  • High-performance Sc-Y-co-doped zirconium oxide thermal protection coating and preparing method thereof
  • High-performance Sc-Y-co-doped zirconium oxide thermal protection coating and preparing method thereof

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preparation example Construction

[0029] Preparation method of scandium yttrium co-doped zirconia powder: ZrOCl with a purity of 99.9% 2 ·8H 2 O, Y (NO 3 ) 3 ·6H 2 O and Sc(NO 3 ) 3 ·6H 2 O as raw material, deionized water as solvent, mole percent, Sc 2 o 3 Content: 4.0~8.0mol.%; Y 2 o 3 Content: 0.5~2.0mol.% and the rest is ZrO 2 , prepared into an aqueous solution with a total concentration of three metal ions of Zr, Sc and Y of 0.4mol / L, stirred by magnetic force for 3 to 6 hours until it became clear and transparent, and then the solution was obtained, and citric acid and polyethylene glycol were added to the solution, respectively, for each The amount of citric acid added in 1 liter of solution was 100 g, and the amount of polyethylene glycol added in every liter of solution was 10 g; the sol was prepared by magnetic stirring until transparent. The sol is then spray-dried at 350°C to make spherical powder, and finally the spherical powder between 180 mesh and 500 mesh is screened to make ScYSZ ...

Embodiment 1

[0044] In terms of mole percentage, take 7.0mol% Sc 2 o 3 -0.5mol% Y 2 o 3 -ZrO 2 Ingredient powders are raw materials (such as figure 1 As shown), the supersonic plasma spraying technology was used to prepare the coating on the substrate preheated to 100°C. The spraying parameters were: current 450A, voltage 160V, argon flow rate 70slpm, hydrogen flow rate 15slpm, spraying distance 100mm , The amount of powder feeding is 30~40g / min, and the moving speed of the spray gun is 600mm / s.

[0045] The cross-sectional morphology of the prepared thermal protection coating is as follows: figure 2 As shown, the scandium-yttrium co-doped zirconia coating has a thickness of 180-220 μm, a porosity of 9%, and a fracture toughness of 2.5 MPa m 1 / 2 .

[0046] Put the matrix-free coating into a resistance furnace, and after heat treatment at 1300°C for 300 hours, the scandium-yttrium co-doped zirconia coating presents a single tetragonal phase structure (such as image 3 shown).

[0...

Embodiment 2

[0050] In terms of mole percentage, take 7.0mol% Sc 2 o 3 -0.5mol% Y 2 o 3 -ZrO 2 The component powder is used as the raw material, and the supersonic plasma spraying technology is used to prepare the coating on the substrate preheated to 200°C. The spraying parameters are: current 400A, voltage 130V, argon flow rate 65 slpm, hydrogen flow rate 12 slpm, spraying distance It is 110mm, the powder feeding amount is 30g / min, and the moving speed of the spray gun is 700mm / s.

[0051] The prepared thermal protective coating has a thickness of 100-150 μm, a porosity of 14%, and a fracture toughness of 2.2 MPa·m 1 / 2 .

[0052] The matrix-free coating was placed in a resistance furnace, and after heat treatment at 1300°C for 300 hours, the scandium-yttrium co-doped zirconia coating presented a single tetragonal phase structure.

[0053] The thermal conductivity of the coating from room temperature to 1100° C. is measured by laser flash method to be 0.8-0.95 W / m·K.

[0054] The t...

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Abstract

The invention relates to a high-performance Sc-Y-co-doped zirconium oxide thermal protection coating and a preparing method thereof. The coating is prepared on a base body by spraying Sc-Y-co-doped zirconium oxide powder through a supersonic plasma spraying technology, wherein the parameters of the supersonic plasma spraying technology are as follows: the current is 300-600A, the voltage is 100-180V, the primary gas argon flow rate is 50-200slpm, the secondary gas hydrogen flow rate is 8-30slpm, the spraying distance is 80-150mm, the powder delivery amount is 20-60g / min, and the moving speed of a spray gun is 500-800mm / s. The prepared coating has a single tetragonal structure with even components, is more stable than a yttrium oxide part which is widely applied at present, has heat conductivity which is lower than that of the zirconium oxide coating and has better high-temperature stability. The coating can greatly increase the working efficiency and service life of the metal hot-end components of high-end equipment, such as aircraft engines and heavy-duty gas turbines.

Description

technical field [0001] The invention belongs to the field of metal surface corrosion and protection, in particular to a high-performance scandium-yttrium co-doped zirconia thermal protection coating and a preparation method thereof. Background technique [0002] Thermal protective coating is to coat high temperature resistant, oxidation resistant and corrosion resistant ceramic materials on the surface of alloy substrate, thereby reducing the temperature bearing capacity of metal hot end parts and improving their service life. It is widely used in aviation, ships, nuclear power, weapons and equipment etc. [0003] The widely used thermal protection coating ceramic material is 6-8wt% Y 2 o 3 Partially stabilized ZrO 2 (YSZ). YSZ itself has a high melting point, low thermal conductivity, high fracture toughness and a thermal expansion coefficient that matches well with the matrix. But when the use temperature exceeds 1200℃, due to Y 3+ segregation, resulting in a metasta...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/11C23C4/18
Inventor 白宇范薇陶闻钟汪瑞军王子圳
Owner XI AN JIAOTONG UNIV
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