Doped modified Gd2Zr2O7 ceramic material and preparation method thereof

A technology of gd2zr2o7 and ceramic materials, applied in the field of thermal barrier coating ceramic materials, can solve problems such as improvement of unfavorable material thermal physical properties, and achieve the effect of convenient thermal physical properties and convenient research.

Active Publication Date: 2019-09-20
INNER MONGOLIA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] But if doped Gd 2 Zr 2 o 7 The ionic radius ratio of the A and B sites r(Gd 3+ ) / r(Zr 4+ )<1.46, there will be a transformation from pyrochlore structure to fluorite structure, which is not conducive to the improvement of the thermophysical properties of the material

Method used

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  • Doped modified Gd2Zr2O7 ceramic material and preparation method thereof
  • Doped modified Gd2Zr2O7 ceramic material and preparation method thereof
  • Doped modified Gd2Zr2O7 ceramic material and preparation method thereof

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preparation example Construction

[0049] The present invention provides the doped modified Gd described in the above scheme 2 Zr 2 o 7 A method for preparing a ceramic material, comprising the steps of:

[0050] (1) Gd 2 o 3 , ZrO 2 and Nb 2 o 5 Carry out mixed ball milling to obtain a mixture;

[0051] The Gd 2 o 3 , ZrO 2 and Nb 2 o 5 The dosage is calculated according to the chemical composition shown in formula 1; Gd 2 (Zr 1-x Nb x ) 2 o 7+x Formula 1; 0<x≤0.3 in said formula 1;

[0052] (2) Carrying out the first sintering of the mixed material to obtain a sintered material;

[0053] (3) performing secondary ball milling on the sintered material to obtain sintered powder;

[0054] (4) Compressing the sintered powder to obtain a biscuit;

[0055] (5) Carrying out the second sintering of the green compact to obtain doped modified Gd 2 Zr 2 o 7 Ceramic material.

[0056] In the present invention, unless otherwise specified, the raw materials used are commercially available products we...

Embodiment 1

[0083] (1) Gd 2 o 3 , ZrO 2 and Nb 2 o 5 Put different zirconia crucibles into a resistance furnace, and bake at 800°C for 2 hours to remove the moisture absorbed by the raw materials;

[0084] (2) Weigh 29.675g Gd according to the stoichiometric ratio 2 o 3 , 18.15g ZrO 2 and 2.175gNb 2 o 5 , put it into a polyurethane ball mill tank with zirconia balls as the grinding body, add 100g of ethanol, and then put the polyurethane ball mill tank filled with materials on a planetary ball mill for ball milling for 24 hours, the ball mill speed is 480r / min, pour out the slurry after ball milling The material was placed in a drying oven and dried at 70°C for 12 hours to obtain a mixture;

[0085] (3) Put the mixture into a zirconia crucible and sinter in a high-temperature furnace at 1500° C. for 6 hours to obtain a sintered material.

[0086] (4) Put the sintered material into the polyurethane ball milling tank again for secondary ball milling, put it into an agate mortar an...

Embodiment 2

[0091] The difference with Example 1 is that weighing 29.58g Gd 2 o 3 , 16.085g ZrO 2 and 4.335g Nb 2 o 5 , the resulting doped modified Gd 2 Zr 2 o 7 The chemical composition of the ceramic material is: Gd 2 (Zr 0.8 Nb 0.2 ) 2 o 7.2 .

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Abstract

The invention provides a doped modified Gd2Zr2O7 ceramic material and a preparation method thereof, and belongs to the technical field of thermal barrier coating ceramic materials, wherein the doped modified Gd2Zr2O7 ceramic material is formed by a substance having a chemical composition represented by a formula 1, the formula 1 is Gd2(Zr1-xNbx)2O7+x, and x is more than 0 and is less than or equal to 0.3. According to the present invention, the B-site ionic radius of the Gd2Zr2O7 ceramic material can be reduced by doping the B-site of the Gd2Zr2O7 ceramic material with the Nb<5+> with small ionic radius, and the B-site can be continuously doped with the small radius ions on the basis of the Gd2(Zr1-xNbx)2O7+x, such that the material can maintain the pyrochlore structure while the multi-ion doping modification can be achieved so as to conveniently perform thermophysical property research on the pyrochlore-structured Gd2Zr2O7 ceramic material.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coating ceramic materials, in particular to a doped modified Gd 2 Zr 2 o 7 Ceramic materials and methods for their preparation. Background technique [0002] Thermal barrier coatings (TBCs) are materials that use ceramic coatings to adhere to the surface of high-temperature-resistant metals or superalloys to protect the metal substrate. It can prevent the external environment from transferring heat to the substrate and prevent the substrate from being oxidized and corroded due to high temperature. , Wear and other issues. [0003] Rare earth zirconate thermal barrier coating ceramic materials have a single pyrochlore structure (the general chemical structure of pyrochlore is A 2 B 2 o 7 ), its thermophysical properties are excellent, and no phase transition occurs below its melting point. Among these materials, Gd 2 Zr 2 o 7 Ceramic materials not only have low thermal conductivit...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/622C04B35/626
CPCC04B35/50C04B35/622C04B35/62605C04B2235/3244C04B2235/3251C04B2235/602C04B2235/6567C04B2235/9607
Inventor 宋希文姜涛谢敏包金小周芬郜建全阮飞
Owner INNER MONGOLIA UNIV OF SCI & TECH
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