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Porous high-entropy hexaboride ceramic and preparation method thereof

A hexaboride, porous ceramic technology, applied in ceramic products, other household appliances, applications, etc., can solve the problems of increasing the thermal conductivity of porous materials, increasing the temperature and pressure of the substrate, and sintering porous materials, and achieving high porosity and high porosity. The effect of high porosity and air permeability

Inactive Publication Date: 2019-12-27
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these systems have obvious shortcomings, that is, the porous materials of these systems will undergo obvious sintering at high temperatures, resulting in a significant increase in the thermal conductivity of the porous materials at high temperatures, which will increase the temperature and pressure of the matrix. , and eventually lead to the failure of the aircraft

Method used

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  • Porous high-entropy hexaboride ceramic and preparation method thereof
  • Porous high-entropy hexaboride ceramic and preparation method thereof
  • Porous high-entropy hexaboride ceramic and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Y particles with a diameter of 2 µm 2 o 3 , Yb 2 o 3 、Sm 2 o 3 、Nd 2 o3 、Eu 2 o 3 and B 4 C Press Y 2 o 3 :Yb 2 o 3 :Sm 2 o 3 :Nd 2 o 3 :Eu 2 o 3 :B 4 C = 1:1:1:1:1:15.2 molar ratio weighing, adding absolute ethanol, mixing with a planetary ball mill for 12 hours, the mixed raw materials are vacuum dried to obtain a mixture powder, which is pressed into For a disc with a diameter of 15 mm and a thickness of 8 mm, the pressing pressure is 4 MPa. Put the dry-pressed sample into a high-temperature vacuum furnace, heat it to 1850°C at a heating rate of 5°C / min, and conduct a high-temperature gas-solid phase reaction for 2 hours with a vacuum degree of 14Pa. The obtained ultra-high temperature porous high-entropy hexaboride ceramics The porosity is 64%, and the compressive strength is 32MPa. The whole preparation process is as figure 1 As shown, the composition of the obtained ultra-high temperature ceramic porous framework is as follows figure 2 As s...

Embodiment 2

[0029] The particle diameter is 2 µm Y 2 o 3 , Yb 2 o 3 、Sm 2 o 3 、Nd 2 o 3 、Eu 2 o 3 and boron powder Y with a particle diameter of 10 microns 2 o 3 :Yb 2 o 3 :Sm 2 o 3 :Nd 2 o 3 :Eu 2 o 3 : boron powder=1:1:1:1:1:70.3 molar ratio weighing, adding absolute ethanol, mixing with a planetary ball mill for 6 hours, mixing uniform raw materials to obtain mixture powder through vacuum drying, pressing with dry pressing molding method Form into discs with a diameter of 12 mm and a thickness of 8 mm, and the pressing pressure is 2 MPa. Put the dry-pressed sample into a high-temperature vacuum furnace, heat it to 1850°C at a heating rate of 4°C / min, and conduct a high-temperature gas-solid phase reaction for 2.5 hours with a vacuum of 10 Pa. The obtained ultra-high temperature porous high-entropy hexaboride ceramics The porosity is 71%, and the compressive strength is 11MPa. Microstructure such as Figure 4 As shown, it can be observed that the pores are evenly di...

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Abstract

The invention relates to porous high-entropy hexaboride ceramic and a preparation method thereof. The invention relates to an ultrahigh-temperature porous high-entropy hexaboride ceramic, in particular to an ultrahigh-temperature porous high-entropy hexaboride ceramic with low density, high strength, high porosity and high air permeability and a method for preparing the ultrahigh-temperature porous high-entropy hexaboride ceramic by utilizing high-temperature gas-solid phase reaction and high-temperature partial sintering under a vacuum condition. The invention belongs to to the field of superhigh temperature porous ceramics, wherein the low density refers to that the density is not greater than 1.73 g / cm<3>, the high strength refers to that the strength is not less than 11 MPa, the high porosity refers to that the porosity is not less than 64%, the high air permeability refers to that the air permeability is not less than 2.65*10 <-11> m<2>, and the high entropy refers to that the types of metal elements in the hexaboride ceramic are not less than five.

Description

technical field [0001] The invention relates to a porous high-entropy hexaboride ceramic and its preparation method, in particular to a low-density, high-strength, high-porosity, high-permeability ultra-high-temperature porous high-entropy hexaboride ceramic and its use of high-temperature gas under vacuum conditions. A method for preparing ultra-high-temperature porous high-entropy hexaboride ceramics by solid-state reaction and high-temperature partial sintering, which belongs to the field of ultra-high-temperature porous ceramics. The low density refers to a density not greater than 1.73g / cm 3 , high strength means that the strength is not lower than 11MPa, high porosity means that the porosity is not lower than 64%, high air permeability means that the air permeability is not lower than 2.65×10 -11 m 2 , High entropy means that the types of metal elements in hexaboride ceramics are not less than five. Background technique [0002] The existing high-temperature heat-ins...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/50C04B35/622C04B38/00
CPCC04B35/50C04B35/5805C04B38/00C04B2235/3225C04B2235/3821C04B2235/6562C04B2235/96C04B38/0074
Inventor 向会敏陈恒周延春刘家臣戴付志
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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