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Shining thermal barrier coating system of rare earth niobate based on defective fluorite structure and preparation method of shining thermal barrier coating system

A technology of fluorite structure and thermal barrier coating, which is applied in coating, metal material coating process, vacuum evaporation plating, etc., can solve the problems of low thermal conductivity and high thermal stability, and achieve low thermal conductivity and chaos The effect of high and excellent oxygen barrier capacity

Inactive Publication Date: 2017-07-21
乐延伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above prior art that the zirconia material doped with rare earth metal has low thermal conductivity, high thermal stability and high temperature sintering performance, which is beneficial to reduce the thermal stress generated during the thermal cycle and improve the thermal cycle life of the coating. However, it does not fundamentally solve the crack and peeling problems of zirconia thermal barrier coating materials
[0005] Rare earth niobate is a kind of bonding and functional performance integrated material, which is widely used in dielectric, optics and structure, but there is no research on the application of high temperature thermal barrier coating

Method used

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  • Shining thermal barrier coating system of rare earth niobate based on defective fluorite structure and preparation method of shining thermal barrier coating system

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Experimental program
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Effect test

Embodiment 1

[0027] (1) Calcinate Y2O3 and Nb2O3 powders at 1000°C for 1 hour, mix them according to the stoichiometric ratio, use absolute ethanol as a mixed graft, and use zirconia as the ball milling medium for ball milling, wherein the total volume of balls is 45-45% of the volume of the ball mill tank 55% at a rotational speed of 300r / min to obtain a mixed slurry, which was subjected to rotary evaporation and dried in a drying oven at 120°C for 12 hours, and passed through a 400-mesh sieve to obtain a pre-sintered powder.

[0028] (2) The pre-sintered powder is held at 20MPa for 5 minutes, and dry-pressed into a disc with a diameter of 15mm and a thickness of 2mm. The formed green body is placed in a dry box for 24 hours after being held at 220MPa for 2 minutes to release the static pressure generated during the process. The internal stress is obtained green body.

[0029] (3) The green body is sintered in air without pressure, the sintering temperature parameter is from room temperat...

Embodiment 2

[0032] (1) Calcinate Yb2O3 and Nb2O3 powders at 1000°C for 1 hour, mix them according to the stoichiometric ratio, use absolute ethanol as a mixed graft, and use zirconia as a ball milling medium for ball milling mixture, wherein the total volume of balls is 45-45% of the volume of the ball mill tank 55% at a rotational speed of 300r / min to obtain a mixed slurry, which was subjected to rotary evaporation and dried in a drying oven at 120°C for 12 hours, and passed through a 400-mesh sieve to obtain a pre-sintered powder.

[0033] (2) The pre-sintered powder is held at 20MPa for 5 minutes, and dry-pressed into a disc with a diameter of 15mm and a thickness of 2mm. The formed green body is placed in a dry box for 24 hours after being held at 220MPa for 2 minutes to release the static pressure generated during the process. The internal stress is obtained green body.

[0034] (3) The green body is sintered in air without pressure, the sintering temperature parameter is from room t...

Embodiment 3

[0037] (1) Calcinate Gd2O3 and Nb2O3 powders at 1000°C for 1 hour, mix them according to the stoichiometric ratio, use absolute ethanol as a mixed graft, and use zirconia as the ball milling medium for ball milling, wherein the total volume of balls is 45-45% of the volume of the ball mill tank 55% at a rotational speed of 300r / min to obtain a mixed slurry, which was subjected to rotary evaporation and dried in a drying oven at 120°C for 12 hours, and passed through a 400-mesh sieve to obtain a pre-sintered powder.

[0038] (2) The pre-sintered powder is held at 20MPa for 5 minutes, and dry-pressed into a disc with a diameter of 15mm and a thickness of 2mm. The formed green body is placed in a dry box for 24 hours after being held at 220MPa for 2 minutes to release the static pressure generated during the process. The internal stress is obtained green body.

[0039] (3) The green body is sintered in air without pressure, the sintering temperature parameter is from room tempera...

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Abstract

The invention provides a shining thermal barrier coating system of rare earth niobate based on a defective fluorite structure and a preparation method of the shining thermal barrier coating system. The preparation method comprises the following steps that Ln2O3 powder and Nb2O3 powder are calcined for one hour at the temperature of 1000 DEG C and mixed at the stoichiometric ratio, absolute ethyl alcohol serves as mixing graft, zirconia is used as a ball-milling medium ball-milling mixed material, and after rotary evaporation and drying, presintered powder is obtained; dry pressing and forming are conducted to obtain a blank; the blank is subjected to pressureless sintering in air and then uniformly mixed with Ln3NbO3, and high-fluidity powder is formed through spray granulation and dry treatment; and a layer of metal bonding layer McrAlY alloy is deposited on the surface of a cobalt-based or nickel-based metal substrate, the high-fluidity powder is deposited on the surface of a metal bonding layer to form a ceramic layer through an ion spray technology, an electron beam physical vapor deposition technology or other spray technologies, and the thermal barrier coating system is formed. The shining thermal barrier coating system of the rare earth niobate is integrated in structure and function, and low in heat conductivity.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coating materials, and in particular relates to a luminescent thermal barrier coating system based on a rare earth niobate with defective fluorite structure and a preparation method thereof. Background technique [0002] Thermal barrier coating, also known as thermal insulation coating, refers to a metal-ceramic composite coating system composed of a ceramic layer with good thermal insulation and a metal bonding layer. Thermal barrier coatings can protect components such as aero engines and gas turbines from heat, and can also isolate the substrate from the high-temperature adhesive properties of the external environment, preventing components from being oxidized, corroded and eroded by high temperatures, improving the working power of components and reducing fuel consumption. consume. [0003] At present, the widely used thermal barrier coating material is 7-8% Y2O3 partially stabilized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/30C23C14/08C23C14/02C23C4/11C23C4/134C04B35/495C04B35/622
CPCC04B35/495C04B35/62222C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3251C23C14/025C23C14/08C23C14/30
Inventor 乐延伟
Owner 乐延伟
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