Rare earth tantalate (RE3TaO7) thermal barrier coating and preparation method thereof

A thermal barrier coating, tantalate technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problems of low thermal expansion coefficient, high thermal conductivity, low operating temperature of 6-8YSZ, etc. Achieve the effect of low thermal conductivity, high purity and complete phase formation

Active Publication Date: 2020-11-10
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the widely used thermal barrier coating materials are mainly 6%-8% yttria-stabilized zirconia (6-8YSZ) and lanthanum zirconate (La 2 Zr 2 o 7 ), both of these two ceramics have a certain degree of deficiency: the use temperature of 6-8YSZ is low (≤1200 ℃), and the thermal conductivity is also high (about 2.5W·m -1 ·K -1 , 900℃), La 2 Zr 2 o 7 However, there is a problem of low thermal expansion coefficient. With the future development needs of high thrust-to-weight ratio and high outlet temperature of engines and gas turbines, it is imminent to find new thermal barrier coating materials

Method used

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  • Rare earth tantalate (RE3TaO7) thermal barrier coating and preparation method thereof
  • Rare earth tantalate (RE3TaO7) thermal barrier coating and preparation method thereof
  • Rare earth tantalate (RE3TaO7) thermal barrier coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A rare earth tantalate (RE3TaO7) thermal barrier coating, the coating is a multi-element gradient coating, including two different rare earth tantalate ceramic components, respectively Y 3 TaO 7 and Gd 3 TaO 7 , the volume fraction ratio of the two rare earth tantalate ceramic powders is shown in Table 1 below.

[0033] The preparation method of the above-mentioned rare earth tantalate ceramic powder to prepare Gd 3 TaO 7 As an example, the following steps are included:

[0034] Step 1: Follow Gd 3 TaO 7 The structural formula will be Gd 2 o 3 Dissolve in concentrated nitric acid for reaction, and adjust the pH to about 1, then prepare the TaOCl 3 Add the solution dropwise (dropping speed is 200mL / min), keep stirring, add ammonia water at the same time to stabilize the pH of the system at 9-10, stir for 1 hour, continue stirring for 120min in a 60°C water bath environment, and then use deionized water Continuously wash the precipitate until PH = 7, dry the obt...

Embodiment 2

[0042] The difference from Example 1 is that, as shown in Table 2, the number of gradient layers n=11, the thickness of the rare earth tantalate coating is 200 μm, and Y in each gradient layer 3 TaO 7 and Gd 3 TaO 7 The volume fraction of is shown in Table 2 below.

[0043] Table 2 is Y in each gradient layer of embodiment 2 3 TaO 7 and Gd 3 TaO 7 The volume fraction table

[0044] Number of gradient layers n Y 3 TaO 7 Volume fraction(%)

Embodiment 3

[0046] The difference from Example 1 is that, as shown in Table 3, the number of gradient layers of the ceramic coating n=21, the thickness of the rare earth tantalate coating is 300 μm, and Y in each gradient layer 3 TaO 7 and Gd 3 TaO 7 The volume fraction of is shown in Table 3 below.

[0047] Table 3 is Y in each gradient layer of embodiment 3 3 TaO 7 and Gd 3 TaO 7 The volume fraction table

[0048]

[0049]

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Abstract

The invention relates to the technical field of thermal barrier coatings, and particularly discloses a rare earth tantalate (RE3TaO7) thermal barrier coating and a preparation method thereof. Tantalate ceramic powder of more than two different rare earth elements is taken and mixed into n parts of mixed ceramic powder; the volume fraction of at least more than one tantalate ceramic component in the n parts of mixed ceramic powder is continuously increased or decreased; and sequentially depositing n parts of mixed ceramic powder on the base material to obtain the multi-gradient rare earth tantalate thermal barrier coating. The multi-element gradient coating is obtained by designing tantalate ceramic powder of more than two different rare earth elements, that is, the volume fraction of at least one ceramic component in the coating is continuously increased or continuously decreased, so that the thermal barrier coating has a high expansion coefficient of the original rare earth tantalate(RE3TaO7). Meanwhile, the heat conductivity is also greatly reduced.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to a rare earth tantalate (RE3TaO7) thermal barrier coating and a preparation method thereof. Background technique [0002] Thermal barrier coatings use the heat insulation and corrosion resistance characteristics of ceramics to protect the base material, and have important application values ​​in aviation, aerospace, ships, weapons, etc. At present, the widely used thermal barrier coating materials are mainly 6%-8% yttria-stabilized zirconia (6-8YSZ) and lanthanum zirconate (La 2 Zr 2 o 7 ), both of these two ceramics have a certain degree of deficiency: 6-8YSZ has a lower operating temperature (≤1200°C), and a higher thermal conductivity (about 2.5W·m -1 ·K -1 , 900℃), La 2 Zr 2 o 7 However, there is a problem of low thermal expansion coefficient. With the future development needs of high thrust-to-weight ratio and high outlet temperature of engines and gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/50C04B35/622C23C4/11C23C4/131
CPCC04B35/495C04B35/50C04B35/62222C04B2235/3225C23C4/11C23C4/131
Inventor 冯晶郑奇陈琳王一涛杨凯龙汪俊张志东李振军王峰
Owner KUNMING UNIV OF SCI & TECH
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