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A kind of high thermal stability ceramic material and its preparation method and application

A technology with high thermal stability and ceramic materials, which is applied in the field of ceramic materials, can solve problems such as thermal stability reduction, and achieve the effect of increasing entropy, good application prospects, and increasing system entropy

Active Publication Date: 2022-04-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, LaMgAl 11 o 19 There is a problem of reduced thermal stability at high temperatures, and it will be partially decomposed to form LaAlO 3 , so it is difficult to work in a high temperature environment for a long time, which seriously limits the LaMgAl 11 o 19 Application and promotion in the above fields

Method used

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  • A kind of high thermal stability ceramic material and its preparation method and application
  • A kind of high thermal stability ceramic material and its preparation method and application
  • A kind of high thermal stability ceramic material and its preparation method and application

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preparation example Construction

[0028] The present invention provides a method for preparing a high thermal stability ceramic material described in the above technical solution, comprising the following steps:

[0029] Mix the lanthanum source, terbium source, dysprosium source, holmium source, erbium source, magnesium source and aluminum source, and perform cold pressing to obtain a green body; the lanthanum source, terbium source, dysprosium source, holmium source, erbium source, magnesium source The molar ratio of lanthanum, terbium, dysprosium, holmium, erbium, magnesium and aluminum in the source and the aluminum source is (0.4-x):x:0.2:0.2:0.2:1:11, 0<x ≤0.2;

[0030] Insulating the green body in stages to obtain a ceramic material with high thermal stability;

[0031] The step-by-step heat preservation process includes: the first stage: the calcination temperature is 1400-1450°C, the heat preservation time is 2-3h; the second stage: the calcination temperature is 1700-1750°C, the heat preservation ti...

Embodiment 1

[0046] La 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Tb 4 o 7 Powder (average particle size 10nm, purity ≥ 99.9%), Dy 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Ho 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Er 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Al 2 o 3 Powder (average particle size is 10nm, purity ≥ 99.9%) and MgO powder (average particle size is 10nm, purity ≥ 99.9%) according to (La 0.2 Tb 0.2 Dy 0.2 Ho 0.2 Er 0.2 )MgAl 11 o 19 The stoichiometric ratio is batched, where La 2 o 3 Powder, Tb 4 o 7 Powder, Dy 2 o 3 Powder, Ho 2 o 3 Powder, Er 2 o 3 Powder, Al 2 o 3 The molar ratio of the powder and the MgO powder is 0.2:0.1:0.2:0.2:0.2:11:2, the resulting mixture is mixed with absolute ethanol, and wet ball milled, the ball milling speed is 300rpm, and the ball milling time is 10h, to obtain Light gray mixed powder;

[0047] Put the light gray mixed powder into a stainless stee...

Embodiment 2

[0050] La 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Tb 4 o 7 Powder (average particle size 10nm, purity ≥ 99.9%), Dy 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Ho 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Er 2 o 3 Powder (average particle size 10nm, purity ≥ 99.9%), Al 2 o 3 Powder (average particle size is 10nm, purity ≥ 99.9%) and MgO powder (average particle size is 10nm, purity ≥ 99.9%) according to (La 0.3 Tb 0.1 Dy 0.2 Ho 0.2 Er 0.2 )MgAl 11 o 19 The stoichiometric ratio is batched, where La 2 o 3 Powder, Tb 4 o 7 Powder, Dy 2 o 3 Powder, Ho 2 o 3 Powder, Er 2 o 3 Powder, Al 2 o 3 The molar ratio of the powder and the MgO powder is 0.3:0.05:0.2:0.2:0.2:11:2, the resulting mixture is mixed with absolute ethanol, and wet ball milled, the ball milling speed is 280rpm, and the ball milling time is 12h, to obtain Light gray mixed powder;

[0051] Put the light gray mixed powder into a stainless ste...

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Abstract

The invention provides a high thermal stability ceramic material, a preparation method and application thereof, and belongs to the technical field of high entropy ceramic materials. The present invention is based on the entropy stabilization effect of high-entropy ceramics, in LaMgAl 11 O 19 The introduction of heavy rare earth elements (Tb, Dy, Ho, and Er) with a large difference in La radius can further increase the degree of lattice distortion, and further improve the entropy of the system on the basis of realizing high entropy of ceramics to obtain the maximum configuration entropy. value to maximize the thermal stability of the system, thereby obtaining high thermal stability ceramic materials. In the present invention, the sintering is carried out by means of two-stage heating, the heating rate of each stage is gradually slowed down, and the cooling rate of each stage is gradually accelerated. It is still stable, no second phase is generated, and there is no microcrack on the surface, which has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a ceramic material with high thermal stability and its preparation method and application. Background technique [0002] LaMgAl 11 o 19 Ceramics have the characteristics of high melting point, low density, low thermal conductivity, large thermal expansion coefficient and high fracture toughness, so they have broad application space in the field of thermal protection of aerospace vehicles and industrial furnaces. However, LaMgAl 11 o 19 There is a problem of reduced thermal stability at high temperatures, and it will be partially decomposed to form LaAlO 3 , so it is difficult to work in a high temperature environment for a long time, which seriously limits the LaMgAl 11 o 19 Application and promotion in the above fields. Contents of the invention [0003] The object of the present invention is to provide a ceramic material with high thermal stability and its pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/44C04B35/50C04B35/622
CPCC04B35/44C04B35/50C04B35/622C04B2235/3227C04B2235/3206C04B2235/3217C04B2235/6562
Inventor 刘玲马壮柳彦博朱皓麟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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