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Pure-phase rare-earth zirconate nanometer material and preparation method thereof

A nano-material and zirconate technology, which is applied in the field of pure-phase rare earth zirconate nano-thermal barrier coating materials and its preparation, can solve the problem of incomplete high-temperature calcination phase transition reaction, unstable high-temperature phase structure, and affecting the use of coatings Performance and other issues, to improve the effect of heat insulation, high-temperature phase structure stability, and improve the effect of service life

Active Publication Date: 2017-04-26
CHINA BUILDING MATERIALS ACAD
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  • Abstract
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  • Claims
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Problems solved by technology

However, the thermal expansion coefficient of the material is still high, and the high-temperature phase structure is unstable, so the use temperature is limited to within 1550 °C and the thermal shock resistance is poor.
In addition, at present, the method of solid phase sintering is mainly used to prepare this kind of zirconate material. In the preparation process, ball milling powder mixing and high temperature calcination process are involved, and there are uneven powder mixing, high temperature calcination phase transition reaction incomplete and grain growth, etc. Disadvantages, affecting the performance of the coating

Method used

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  • Pure-phase rare-earth zirconate nanometer material and preparation method thereof
  • Pure-phase rare-earth zirconate nanometer material and preparation method thereof

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preparation example Construction

[0035] The invention provides a preparation method of a pure phase rare earth zirconate nano material.

[0036] The method for preparing pure phase rare earth zirconate nanomaterials provided by the present invention includes the following step: adding gadolinium oxide, yttrium oxide, ytterbium oxide, cerium nitrate, and zirconium oxychloride to 0.1:0.3:0.1:x: 1-x) is mixed to obtain a mixture, and dilute nitric acid is added to the mixture to dissolve to obtain a mixed rare earth nitrate solution, wherein said 00.2 Yb 0.2 Y 0.6 ) 2 (Zr 1-x Ce x ) 2 O 7 Slurry; the slurry is cleaned, granulated, and densified to prepare the pure phase rare earth zirconate nanomaterial.

[0037] The invention adopts a high-pressure hydrothermal synthesis method to prepare a five-element thermal barrier coating material. The invention prepares the five-element thermal barrier coating material through the method of acid dissolution, alkalization and high-pressure hydrothermal synthesis. Compared with ...

Embodiment 1

[0047] (Gd 0.2 Yb 0.2 Y 0.6 ) 2 (Zr 0.9 Ge 0.1 ) 2 O 7 Preparation of nano aggregate powder.

[0048] (1) Gd 2 O 3 , Y 2 O 3 , Yb 2 O 3 , Ce(NO 3 ) 3 , ZrOCl 2 Mix according to the molar ratio of 0.1:0.3:0.1:0.1:0.9, add the mixed powder gradually into a beaker containing dilute nitric acid, and control the temperature of the solution to 70°C to form a mixed rare earth nitrate solution.

[0049] (2) Add deionized water to the mixed solution obtained in step (1) to control the concentration of rare earth nitrate to 0.1 mol·L -1 . Drop the solution of this concentration into a glass reactor filled with dilute nitric acid solution, control the temperature at 50℃, pH=10, and stirring speed at 100r·min -1 , The reaction to obtain the hydroxide colloidal solution precursor.

[0050] (3) Add deionized water to the colloidal solution obtained in step (2), and control the water-solid mass ratio of the precursor to 15:1. Put the colloidal solution into the high-pressure hydrothermal synthesis...

Embodiment 2

[0058] (Gd 0.2 Yb 0.2 Y 0.6 ) 2 (Zr 0.86 Ge 0.14 ) 2 O 7 Preparation of nano aggregate powder.

[0059] The difference between this embodiment mode and embodiment 1 mode is Gd 2 O 3 , Y 2 O 3 , Yb 2 O 3 , Ce(NO 3 ) 3 , ZrOCl 2 The molar ratio is 0.1:0.3:0.1:0.14:0.86. The other steps are the same as in Example 1.

[0060] Morphology and phase analysis:

[0061] The first-level particle electron microscope test picture, the electron microscope test picture of the agglomerated powder, and the XRD pattern of the agglomerate powder prepared in this example are the same as those in Example 1.

[0062] Physical performance analysis:

[0063] The test method is the same as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention relates to a pure-phase rare-earth zirconate nanometer material and a preparation method thereof, wherein the nanometer material is Gd<0.2>Yb<0.2>Y<0.6>)<2>(Zr<1-x>Ce<x>)<2>O<7>. The preparation method comprises the steps that gadolinium oxide, yttrium oxide, ytterbium oxide, cerium nitrate and zirconium oxychloride are mixed to obtain a mixture; dilute nitric acid is added into the mixture; dissolution is performed to obtain a mixed rare-earth nitrate solution; the mixed rare-earth nitrate solution is put into a reaction kettle; ammonia water is added; co-precipitation reaction is performed to form a hydroxide colloidal solution, and the colloidal solution is used as a precursor; the precursor is prepared into slurry by a hydro-thermal reaction method; and the slurry is subjected to cleaning, pelleting and compacting to prepare the pure-phase rare-earth zirconate nanometer material. A prepared thermal barrier coating material has the advantages that the thermal expansion coefficient is high; the high-temperature phase structure is stable; and the material is more suitable for practical application.

Description

Technical field [0001] The invention relates to a thermal barrier coating material, in particular to a pure phase rare earth zirconate nano thermal barrier coating material and a preparation method thereof. Background technique [0002] The thermal barrier coating is a coating system composed of a high temperature oxidation resistant metal bonding layer and a low thermal conductivity ceramic surface layer. It can isolate the substrate surface of the hot end part of the engine from the high temperature flame flow, thereby improving the insulation of the hot end part. Heat, high temperature oxidation resistance and corrosion resistance. Thermal barrier coatings are widely used in the thermal protection of the hot end components of aero engines and ground gas turbines. [0003] At present, at 1200℃, the ceramic surface material of thermal barrier coating is widely used in yttria partially stabilized zirconia ZrO 2 -(6-8wt%)Y 2 O 3 . When the operating temperature exceeds 1200°C for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62605C04B2235/3224C04B2235/3225C04B2235/3229C04B2235/9607
Inventor 孙现凯陈玉峰张世超王广海胡利明孙浩然方凯闫达琛陶柳实赵洋
Owner CHINA BUILDING MATERIALS ACAD
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