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A kind of doping modified gd2zr2o7 ceramic material and preparation method thereof

A gd2zr2o7, ceramic material technology, applied in the field of thermal barrier coating ceramic materials, can solve the problems of improving the thermophysical properties of unfavorable materials, and achieve the effects of convenient thermophysical properties, convenient research, and easy control

Active Publication Date: 2021-10-29
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • 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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  • A kind of doping modified gd2zr2o7 ceramic material and preparation method thereof
  • A kind of doping modified gd2zr2o7 ceramic material and preparation method thereof
  • A kind of doping 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

[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, then place the polyurethane ball mill tank filled with materials on a planetary ball mill for 24 hours, and 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 and grind it even...

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 Gd 2 Zr 2 o 7 A ceramic material and a preparation method thereof belong to the technical field of thermal barrier coating ceramic materials. The doped modified Gd 2 Zr 2 o 7 Ceramic materials are formed from substances having the chemical composition shown in Formula 1: Gd 2 (Zr 1‑x Nb x ) 2 o 7+x Formula 1; 0 in the formula 1 <x≤0.3。本发明通过在gd2Zr 2 o 7 The B site of ceramic materials is doped with Nb with smaller ionic radius 5+ , can reduce Gd 2 Zr 2 o 7 The B-site ionic radius of the ceramic material can be in the Gd 2 (Zr 1‑x Nb x ) 2 o 7+x On the basis of continuous doping of small-radius ions at the B site, a variety of ion doping modifications can be achieved while maintaining the pyrochlore structure of the material, which makes it more convenient for the pyrochlore-structured Gd 2 Zr 2 o 7 Research on thermophysical properties of ceramic materials.

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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Patent Type & Authority Patents(China)
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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