Alkaline earth metal ion doped rare earth tantalate or niobate thermal barrier coating and preparation method thereof

A technology of alkaline earth metal ion and thermal barrier coating, which is applied in metal material coating technology, coating, fusion spraying, etc., can solve the problems of high thermal conductivity, low thermal expansion coefficient, and low operating temperature of 6-8YSZ, etc. Achieve the effect of weak interface effect and less time-consuming

Active Publication Date: 2020-11-20
KUNMING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
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  • Application Information

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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: 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 turbines, it is imminent to find new thermal barrier coating materials

Method used

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  • Alkaline earth metal ion doped rare earth tantalate or niobate thermal barrier coating and preparation method thereof
  • Alkaline earth metal ion doped rare earth tantalate or niobate thermal barrier coating and preparation method thereof
  • Alkaline earth metal ion doped rare earth tantalate or niobate thermal barrier coating and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0032] An alkaline earth metal ion-doped rare earth tantalate thermal barrier coating, which is a multi-component gradient coating, including two different ceramic components, and at least one of the ceramic components has a volume fraction along the coating gradient Continuously increasing or decreasing changes, the chemical general formula of the two ceramic components in the present embodiment 1 is Dy 0.8 Ca 0.2 TaO 3.9 and Gd 0.8 Sr 0.2 TaO 3.9 , the volume fraction ratio of the two ceramic components in each gradient coating is shown in Table 1.

[0033] In addition, the above-mentioned preparation method of alkaline earth metal ion doping rare earth tantalate or niobate, in order to prepare Dy 0.8 Ca 0.2 TaO 3.9 As an example, the following steps are included:

[0034] Step 1: Follow Dy 0.8 Ca 0.2 TaO 3.9 The structural formula will be Dy 2 o 3 and CaCO 3 The powder is dissolved in concentrated nitric acid for reaction, and the pH is adjusted to about 1, an...

Embodiment 2

[0043] 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 doped with alkaline earth metal ions is 300 μm, and Dy in each gradient layer 0.8 Ca 0.2 TaO 3.9 and Gd 0.8 Sr 0.2 TaO 3.9 The volume fraction of the powder is shown in Table 2 below.

[0044] Table 2 is Dy in each gradient layer of embodiment 2 0.8 Ca 0.2 TaO 3.9 and Gd 0.8 Sr 0.2 TaO 3.9 Volume fraction of powder (%)

[0045] Number of gradient layers n Dy 0.8 Ca 0.2 TaO 3.9 powder

Embodiment 3

[0047] 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 alkaline earth metal-doped rare earth tantalate coating is 400 μm, and Dy in each gradient layer 0.8 Ca 0.2 TaO 3.9 and Gd 0.8 Sr 0.2 TaO 3.9 The volume fraction of the powder is shown in Table 3 below.

[0048] Table 3 is Dy in each gradient layer of embodiment 3 0.8 Ca 0.2 TaO 3.9 and Gd 0.8 Sr 0.2 TaO 3.9 Volume fraction of powder (%)

[0049]

[0050]

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Abstract

The invention relates to the technical field of thermal barrier coatings and particularly discloses an alkaline earth metal ion doped rare earth tantalate or niobate thermal barrier coating and a preparation method thereof. The coating is a multi-element gradient coating and comprises two or more different ceramic components, the volume fraction of at least one or more ceramic components is continuously increased or decreased along the gradient of the coating, the chemical general formula of the ceramic components in the coating is RE1-xM1xM2O4-x / 2 (0<x<1), and M1 is one of Mg, Ca, Sr or Ba; M2 is Ta or Nb. According to the scheme, it can be guaranteed that the thermal barrier coating has a high expansion coefficient of original alkaline earth metal doped rare earth tantalum / niobate, meanwhile, the thermal conductivity of the thermal barrier coating is greatly reduced, the thermal conductivity detected in an experiment does not exceed 1.10 W.m<-1>.K<-1>, and the requirement of the thermal barrier coating for the low thermal conductivity is met.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coatings, in particular to an alkaline earth metal ion-doped rare earth tantalate or niobate 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 outle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/495C04B35/622C23C4/02C23C4/073C23C4/11C23C4/134
CPCC04B35/495C04B35/50C04B35/62222C04B2235/442C04B2235/9607C23C4/02C23C4/073C23C4/11C23C4/134
Inventor 冯晶郑奇王一涛杨凯龙汪俊陈琳李振军王峰
Owner KUNMING UNIV OF SCI & TECH
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