Pyrochlore structural rare-earth zirconate material and preparation method and application thereof

A pyrochlore structure, zirconate technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the violent fluctuation of thermal expansion coefficient, the reduction of thermal cycle life of the coating, and the increase of thermal stress of the coating and other problems, to achieve the effect of improving low temperature fluctuation, reducing thermal stress and stabilizing thermal expansion coefficient

Active Publication Date: 2013-09-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal expansion coefficients of the zirconate and cerate materials and their single-component doped materials fluctuate sharply in the low temperature range (200-400°C)
Therefore, during use, the thermal stress of the coating increases due to the mismatch of thermal expansion coefficients, and the thermal cycle life of the coating decreases

Method used

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  • Pyrochlore structural rare-earth zirconate material and preparation method and application thereof
  • Pyrochlore structural rare-earth zirconate material and preparation method and application thereof
  • Pyrochlore structural rare-earth zirconate material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] Example 1: 0.4La 2 o 3 -0.5Sm 2 o 3 -0.1R″ 2 o 3 -2ZrO 2 Preparation of Ceramic Material Powder

[0040] The rare earth element R" selected in this embodiment is Yb 2 o 3 、Gd 2 o 3 or Dy 2 o 3 , The selected raw material composition is shown in Table 1.

[0041] The first step: the La 2 o 3 、Sm 2 o 3 , R″ 2 o 3 , ZrO 2 Mix in a molar ratio of 0.4:0.5:0.1:2, and place the mixed powder in a ball mill jar;

[0042] Step 2: Add an appropriate amount of absolute ethanol and zirconia grinding media equal in mass to the mixed powder, mix and grind at a speed of 250r / min for 10 hours, and then dry the slurry at 80°C;

[0043] Step 3: Put the mixed powder in a zirconia crucible and compact it, heat at 1400°C for 6 hours and cool to room temperature, then crush the obtained material, sieve, and ball mill for 12 hours to obtain a powder with a particle size of less than 1 μm;

[0044] The fourth step: put the powder obtained in the third step into a zirconia c...

Embodiment 2

[0050] 0.3La 2 o 3 -0.5Sm 2 o 3 -0.2R″ 2 o 3 -2ZrO 2 Preparation of Ceramic Material Powder

[0051] The difference between this embodiment and Embodiment 1 is that La 2 o 3 、Sm 2 o 3 , R″ 2 o 3 , ZrO 2 The proportioning ratio is 0.3:0.5:0.2:2. Other steps are the same as Embodiment 1.

Embodiment 3

[0053] 0.25La 2 o 3 -0.5Sm 2 o 3 -0.25R″ 2 o 3 -2ZrO 2 Preparation of Ceramic Material Powder

[0054] The difference between this embodiment and Embodiment 1 is that La 2 o 3 、Sm 2 o 3 , R″ 2 o 3 , ZrO 2 The proportioning ratio is 0.25:0.5:0.2:25. Other steps are the same as Embodiment 1.

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Abstract

The invention discloses a pyrochlore structural rare-earth zirconate material system capable of being used for a heat barrier coating. The chemical composition of the material is (0.5-x)R'2O3-0.5Sm2O3-xR''2O3-2ZrO2, wherein x is more than 0 and less than or equal to 0.25; the R' is rare-earth elements or composition thereof, the ion radius of which is greater than that of Sm; and R'' is rare-earth elements or composition thereof, the ion radius of which is smaller than that of Sm. The material provided by the invention has low thermal conductivity, high thermal stability and high-temperature sintering resistance; the thermal expansion performance of the material is stable compared with a single pyrochlore structural material; and the material is favorable for reducing thermal stress generated by mismatching of thermal expansion coefficients in the thermal cycle process, and can prolong the thermal cycle life of the coating. Because of good high-temperature phase stability, the pyrochlore structural rare-earth zirconate material can be used for designing and preparing a novel high-temperature heat barrier coating material, the use temperature of which is below 1,550 DEG C.

Description

technical field [0001] The invention relates to a high-temperature thermal barrier coating material and its preparation method and application, in particular to a pyrochlore structure rare earth zirconate material and its preparation method and application. Background technique [0002] Thermal barrier coating refers to a ceramic coating deposited on the surface of metal parts with good heat insulation effect. This coating can reduce the working temperature of the substrate, protect the metal substrate from high-temperature gas erosion, and improve its high-temperature working life. Thermal barrier coatings are mainly used for thermal protection of hot end components. Thermal barrier coating materials need to have low thermal conductivity, high melting point, high chemical stability, thermal expansion coefficient matching the metal substrate, and good anti-sintering performance. [0003] The widely used thermal barrier coating materials are mainly yttria-stabilized zirconia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/622C23C4/12C23C4/10C23C4/11C23C4/134
Inventor 于建华陶顺衍赵华玉周霞明丁传贤
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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