Method for preparing zirconium oxide-doped gadolinium niobate amorphous high-temperature ceramic coating

A high-temperature ceramic and ceramic coating technology, applied in the coating, metal material coating process, ion implantation plating and other directions, can solve the thermal barrier coating ceramic material peeling failure, thermal expansion coefficient mismatch, difficult to meet the inlet temperature and other problems, to achieve the effects of stable evaporation rate, increased operating temperature, and reduced compositional inhomogeneity

Inactive Publication Date: 2020-11-27
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, because the thermal barrier coating ceramic material (YSZ) can only work stably in an environment below its melting point temperature, when the working temperature exceeds its melting point temperature, the YSZ ceramic material will undergo a phase change, and the thermal expansion coefficient and the base material will become different. Matching, the thermal mismatch leads to the formation of cracks in the high-temperature ceramic material, which will eventually cause the ceramic material of the thermal barrier coating to fall off and fail.

Method used

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  • Method for preparing zirconium oxide-doped gadolinium niobate amorphous high-temperature ceramic coating
  • Method for preparing zirconium oxide-doped gadolinium niobate amorphous high-temperature ceramic coating

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Embodiment 1

[0032] A preparation method of zirconia-doped gadolinium niobate amorphous high-temperature ceramic coating, comprising the following steps:

[0033] Step 1: According to 3mol% ZrO 2 +Gd 3 NbO 7 The stoichiometric ratio was weighed ZrO 2 、Gd 2 o 3 and Nb 2 o 5 The powder is mixed evenly by a ball mill, wherein the speed of the ball mill is 500r / min, and the ball milling time is 120min. The powder after ball milling is dried and passed through a 325 mesh sieve to obtain a powder with uniform particle size, and then sintered at 1400°C for 8h, oxidized Zirconium doped gadolinium niobate sintered body.

[0034] Step 2: crush the sintered body obtained in step 1 into blocks of 2-3 mm.

[0035] Step 3: Deposit the block obtained in Step 2 on the alloy substrate by EB-PVD method to obtain a zirconia-doped gadolinium niobate amorphous ceramic coating, the thickness of the amorphous ceramic coating is 200 μm; wherein the EB-PVD method The process parameters are: the cabin air ...

Embodiment 2

[0039] The only difference between Example 2 and Example 1 is that x=6, that is, the stoichiometric ratio of zirconia-doped niobic acid in Example 2 is 6mol% ZrO 2 +Gd 3 NbO 7 .

Embodiment 3

[0040] The difference between Example 3 and Example 1 is that x=9, that is, the stoichiometric ratio of zirconia-doped niobic acid in Example 3 is 9mol% ZrO 2 +Gd 3 NbO 7 .

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Abstract

The invention relates to the technical field of thermal barrier coatings, and particularly discloses a method for preparing a zirconium oxide-doped gadolinium niobate amorphous high-temperature ceramic coating. The method comprises the steps that powder formed by mixing ZrO2, Gd2O3 and Nb2O5 is subjected to high-temperature sintering, a sintering body is obtained, and the stoichiometric ratio of zirconia doped niobic acid is x mol%ZrO2+Gd3NbO7; the sintering body is smashed into blocks of 2-3 mm; the blocks are deposited on an alloy matrix through an EB-PVD method, and the amorphous ceramic coating with the thickness of 200-300 micrometers is obtained, and according to the technological parameters, the air pressure of a cabin is not higher than 3*10-6Torr, the deposition rate is not lowerthan 10 nm / min, and the rotating rate of a sample is not lower than 45 r / min. The amorphous ceramic coating deposited on the alloy matrix has the extremely low heat conductivity, thus a very good heatinsulation effect can be achieved on the alloy matrix in a high-temperature environment, and the use environmental temperature of the alloy matrix is improved.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a preparation method of a zirconia-doped gadolinium niobate amorphous high-temperature ceramic coating. Background technique [0002] The wide application of thermal barrier coatings on aero-engines greatly reduces the impact and corrosion of high-temperature gas on engine alloy blades on the basis of existing technologies, reduces the surface temperature of engine blades, and increases the years of service. From the high-temperature ceramic materials studied in the past, the ceramic materials suitable for high-temperature thermal barrier coatings mainly include yttria / ceria stabilized zirconia, zirconia / alumina, lanthanum zirconate, strontium zirconate, zirconium phosphate, Zirconium silicate, zirconium titanate, mullite, rare earth oxide ceramics, etc. Among them, yttria-stabilized zirconia (YSZ) has the best overall performance and is currently a widely used ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/08C23C14/54C04B35/495C04B35/622C04B35/626C23C14/02
CPCC04B35/495C04B35/622C04B35/6261C04B2235/3224C04B2235/3244C04B2235/656C04B2235/6567C04B2235/9607C23C14/028C23C14/08C23C14/54
Inventor 冯晶王一涛杨凯龙郑奇汪俊陈琳李振军王峰
Owner KUNMING UNIV OF SCI & TECH
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