Novel perovskite structure high-entropy ceramic and preparation method thereof

A perovskite structure, high-entropy technology, applied in the field of high-entropy ceramic materials, can solve the problems of poor high-temperature thermal stability, low density of high-entropy ceramic materials, and poor matching degree between thermal expansion coefficient and superalloy matrix.

Active Publication Date: 2021-06-08
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to provide a new type of perovskite structure high-entropy ceramics with a single-phase structure and its preparation method to solve high Entropy ceramic materials have low density, poor high temperature thermal stability, and poor matching between thermal expansion coefficient and superalloy matrix.

Method used

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  • Novel perovskite structure high-entropy ceramic and preparation method thereof
  • Novel perovskite structure high-entropy ceramic and preparation method thereof
  • Novel perovskite structure high-entropy ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to Sr(Zr 0.2 Hf 0.2 Ce 0.2 Yb 0.2 Me 0.2 )O 3-x The stoichiometric ratio of (Me=Y, Gd, Sm), that is, the molar ratio of Sr, Zr, Hf, Ce, Yb, and Me elements is 5:1:1:1:1:1, and three different 20g each of the mixed powder. Before weighing, the ZrO 2 , HfO 2 , CeO 2 , Yb 2 o 3 , Y 2 o 3 、Gd 2 o 3 and Sm 2 o 3 Drying treatment at 1000°C for 2h; and SrCO 3 Put it in a drying oven and keep it warm at 120°C for 12h. The specific addition of each component is:

[0035] (1) 9.52g of SrCO 3 , 1.58g of ZrO 2 , 2.70g of HfO 2 , 2.21g of CeO 2 , 2.53g of Yb 2 o 3 , 1.45g of Y 2 o 3 .

[0036] (2) 9.12g of SrCO 3 , 1.52g of ZrO 2 , 2.59g of HfO 2 , 2.12g of CeO 2 , 2.43g of Yb 2 o 3 , 2.23g of Gd 2 o 3 .

[0037] (3) 9.16 SrCO 3 , 1.52g of ZrO 2 , 2.60g of HfO 2 , 2.13g of CeO 2 , 2.44g of Yb 2 o 3 , 2.15g of Sm 2 o 3 .

[0038] The above three mixed powders were placed in a mortar, and 20 g of absolute ethanol was added to grin...

Embodiment 2

[0042] According to Sr(Zr 0.2 Hf 0.2 Ce 0.2 Yb 0.2 Me 0.2 )O 3-x The stoichiometric ratio of (Me=Nd, La, Ti), that is, the molar ratio of Sr, Zr, Hf, Ce, Yb and Me elements is 5:1:1:1:1:1, and three different 20g each of the mixed powder. Before weighing, the ZrO 2 , HfO 2 , CeO 2 , Yb 2 o 3 、Nd 2 o 3 , La 2 o 3 and TiO 2 Drying treatment at 1000°C for 2h; and SrCO 3 Put it in a drying oven and keep it warm at 120°C for 12h. The specific addition of each component is:

[0043] (4) 9.19 SrCO 3 , 1.53g of ZrO 2 , 2.61g of HfO 2 , 2.14g of CeO 2 , 2.45g of Yb 2 o 3 , 2.09g of Nd 2 o 3 .

[0044] (5) 9.22 SrCO 3 , 1.53g of ZrO 2 , 2.62g of HfO 2 , 2.14g of CeO 2 , 2.45g of Yb 2 o 3, 2.03g of La 2 o 3 .

[0045] (6) 9.72 SrCO 3 , 1.62g of ZrO 2 , 2.76g of HfO 2 , 2.26g of CeO 2 , 2.59g of Yb 2 o 3 , 1.05g of TiO 2 .

[0046] The above three mixed powders were placed in a mortar, and 20 g of absolute ethanol was added to grind them thorough...

Embodiment 3

[0049] According to Sr(Zr 0.2 f 0.2 Ce 0.2 Yb 0.2 Me 0.2 )O 3-x The stoichiometric ratio of (Me=Sn, Nb, Ta), that is, the molar ratio of Sr, Zr, Hf, Ce, Yb, and Me elements is 5:1:1:1:1:1, and three different 20g each of the mixed powder. Before weighing, the ZrO 2 , HfO 2 , CeO 2 , Yb 2 o 3 , SnO 2 , Nb 2 o 5 and Ta 2 o 5 Drying treatment at 1000°C for 2h; and SrCO 3 Put it in a drying oven and keep it warm at 120°C for 12h. The specific addition of each component is:

[0050] (7) 9.29 SrCO 3 , 1.54g of ZrO 2 , 2.64g of HfO 2 , 2.15g of CeO 2 , 2.47g of Yb 2 o 3 , 1.90g of SnO 2 .

[0051] (8) 9.40 SrCO 3 , 1.56g of ZrO 2 , 2.67g of HfO 2 , 2.18g of CeO 2 , 2.50g of Yb 2 o 3 , 1.69g of Nb 2 o 5 .

[0052] (9) 8.90 SrCO 3 , 1.48g of ZrO 2 , 2.53g of HfO 2 , 2.07g of CeO 2 , 2.37g of Yb 2 o 3 , 2.66g Ta 2 o 5 .

[0053] The above three mixed powders were placed in a mortar, and 20 g of absolute ethanol was added to grind them thoroughl...

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Abstract

The invention discloses a novel perovskite structure high-entropy ceramic and a preparation method thereof. The structure of the ceramic is an ABO3 type perovskite structure, the A-site element is Sr, and the B-site element is Zr, Hf, Ce, Yb and Me which are in an equal molar ratio. The preparation method comprises the following steps: putting the components into a mortar, adding absolute ethyl alcohol, and performing grinding; performing drying in a drying oven after the grinding, then transferring dried material into a muffle furnace for pre-calcining, and naturally cooling obtained material to room temperature to obtain a ceramic powder; putting the ceramic powder into the mortar, adding a polyvinyl alcohol aqueous solution and absolute ethyl alcohol, performing grinding again, and performing drying and sieving after the grinding is sufficient, adding the sieved ceramic powder into a steel mold of a table type powder tablet press, pre-pressing into a disc-shaped or strip-shaped block material, and then putting the block material into a cold isostatic press for cold isostatic pressing treatment to obtain a ceramic green body; and finally, calcining the ceramic green body in a muffle furnace, and performing cooling in the furnace to obtain the novel perovskite structure high-entropy ceramic. The high-entropy ceramic has the advantages of high stability, low thermal conductivity and relatively high hardness and density.

Description

technical field [0001] The invention relates to the technical field of high-entropy ceramic materials. Specifically, it is a novel perovskite structure high-entropy ceramic and its preparation method. Background technique [0002] High-entropy ceramics is a new concept that introduces high-entropy theory into the field of inorganic non-metals based on the research of high-entropy alloys. In the late 1990s, Professor Ye Junwei of Tsinghua University in Taiwan, China proposed the concept of high entropy, and defined it as the element types greater than or equal to 5 and no dominant element, and the content of all elements is between 5% and 35%. The high-entropy alloy is an alloy obtained by alloying more than five elemental components according to an equiatomic ratio or close to an equiatomic ratio. Single-phase high-entropy ceramics mainly include rock salt alloys, fluorite oxides, perovskite composite oxides, other oxides, borides, carbides, nitrides, and silicides. High-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/48C04B35/49C04B35/457C04B35/495C04B35/622
CPCC04B35/50C04B35/48C04B35/49C04B35/457C04B35/495C04B35/622C04B2235/442C04B2235/3229C04B2235/6562C04B2235/6567
Inventor 马文占浩白玉董红英韩欣欣张鹏齐英伟陈伟东
Owner INNER MONGOLIA UNIV OF TECH
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