High-entropy oxide ultrahigh-temperature thermal barrier coating prepared by using APS technology and method thereof

A technology of oxide and oxide ceramics, which is applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of insufficient high temperature stability, easy phase transition, and reduced toughness, etc., to achieve broadened tetragonal phase stability zone, relieve internal stress, and prevent further cracking

Active Publication Date: 2022-02-01
SHANGHAI JIAO TONG UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a high-entropy oxide ultra-high temperature thermal barrier coating and its method prepared by APS technology, so as to solve the thermal Barrier coatings have problems of insufficient high temperature stability, prone to phase transformation, reduced toughness, and final coating failure

Method used

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  • High-entropy oxide ultrahigh-temperature thermal barrier coating prepared by using APS technology and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) According to Zr 0.544 Y 0.114 Ta 0.114 Nb 0.114 Yb 0.114 o 2 Proportioning takes by weighing the ZrO that purity is more than 99.9% (mass percentage) respectively 2 , Y 2 o 3 、 Ta 2 o 5 , Nb 2 o 5 and Yb 2 o 3 Original powder 46.97g, 9.02g, 17.65g, 10.62g, 15.74g.

[0025] 2) The original powder was mixed by wet ball milling with absolute ethanol as the medium for 20 hours at a speed of 250 r / min. After drying, sinter at 1600°C for 15 hours, and then use electrospraying combined with phase inversion technology to granulate. The obtained spray powder has a high degree of sphericity and good fluidity, and then sieves to obtain a spray powder with a particle size of 30-100 μm .

[0026] 3) Use silicon carbide sandpaper to grind and polish the surface of the nickel-based alloy, then select 40-mesh alumina sand, use a sandblasting machine to roughen the polished surface, and then ultrasonicate the alloy matrix in alcohol Wash for 10 minutes to remove resid...

Embodiment 2

[0029] 1) According to Zr 0.2 Y 0.2 Ta 0.2 Nb 0.2 Yb 0.2 o 2 Proportioning takes by weighing the ZrO that purity is more than 99.9% (mass percentage) respectively 2 , Y 2 o 3 、 Ta 2 o 5 , Nb 2 o 5 and Yb 2 o 3 Original powder 15.66g, 14.34g, 28.07g, 16.89g, 25.04g.

[0030] 2) The original powder was mixed by wet ball milling with isopropanol as the medium for 10 h at a speed of 300 r / min. After drying, sinter at 1600°C for 10 hours, and then use electrospraying combined with phase inversion technology to granulate. The spray powder obtained has a high degree of sphericity and good fluidity, and then sieved to obtain a spray powder with a particle size of 30-100 μm .

[0031] 3) Use silicon carbide sandpaper to grind and polish the surface of the nickel-based alloy, then select 50-mesh alumina sand, use a sandblasting machine to roughen the polished surface, and then ultrasonicate the alloy matrix in alcohol Wash for 15 minutes to remove residual sand and oil o...

Embodiment 3

[0034] 1) According to Zr 0.332 Y 0.167 Ta 0.167 Nb 0.167 Yb 0.167 o 2 Proportioning takes by weighing the ZrO that purity is more than 99.9% (mass percentage) respectively 2 , Y 2 o 3 、 Ta 2 o 5 , Nb 2 o 5 and Yb 2 o 3 Original powder 26.96g, 12.42g, 24.31g, 14.63g, 21.68g.

[0035] 2) The original powder was mixed by wet ball milling with isopropanol as the medium for 20 hours at a speed of 200 r / min. After drying, it is sintered in the air atmosphere at 1600°C for 15 hours, and then granulated by spray drying technology. The obtained spray powder has a high degree of sphericity and good fluidity, and then sieved to obtain a spray powder with a particle size of 30-100 μm.

[0036] 3) Use silicon carbide sandpaper to grind and polish the surface of the nickel-based alloy, then select alumina sand with 45 mesh particles, use a sandblasting machine to roughen the polished surface, and then ultrasonicate the alloy matrix in alcohol Wash for 15 minutes to remove re...

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Abstract

The invention provides a high-entropy oxide ultrahigh-temperature thermal barrier coating prepared by using an APS technology and a method thereof. The method comprises the following steps that: 1), ZrO2, Y2O3, Ta2O5, Nb2O5 and Yb2O3 are weighed respectively; 2), wet grinding, drying, sintering and granulation are carried out on the raw materials; 3), an alloy matrix is provided, grinding and polishing treatment, sand blasting and ultrasonic cleaning are carried out, and a NiCoCrAlY bonding layer is prepared on the surface of the alloy matrix through the APS technology; 4), ceramic powder is deposited on the surface of the bonding layer through the APS technology, and a single-ceramic-layer coating system is obtained; or 4'), YSZ spraying powder is deposited on the surface of the bonding layer through the APS technology, then high-entropy oxide ceramic powder is deposited on the surface of the YSZ ceramic layer, and a double-ceramic-layer coating system is obtained. The ultrahigh-temperature thermal barrier coating prepared according to the method is of a lamellar structure, can still keep a tetragonal phase at the high temperature of 1600 DEG C and has good application prospects.

Description

technical field [0001] The invention relates to the field of thermal barrier coatings, in particular to a high-entropy oxide ultra-high temperature thermal barrier coating prepared by using APS technology and a method thereof. Background technique [0002] Thermal barrier coatings are often used to protect gas turbine metal components from high temperature oxidation and corrosion, and to reduce the surface temperature of the base alloy. With the development of advanced gas turbines towards high flow rates and high thrust-to-weight ratios, the currently widely used yttria-stabilized zirconia (YSZ) thermal barrier coatings have serious drawbacks. When the temperature exceeds 1200 ° C, a t→m phase transition will occur when cooling, and YSZ ceramics are resistant to CMAS molten salt (CaO-MgO-AlO 1.5 -SiO 2 ) has extremely poor corrosion resistance. Solid particles such as dust or volcanic ash in the air can be inhaled and melted and infiltrated into the ceramic layer, causin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/10C23C4/02C23C4/073
CPCC23C4/134C23C4/10C23C4/02C23C4/073Y02T50/60
Inventor 赵晓峰张显程郭芳威石俊秒范晓慧杨凯王卫泽陆体文刘利强孙子豪
Owner SHANGHAI JIAO TONG UNIV
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