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A kind of high density ceramic material and its preparation method and application

A ceramic material and dense technology, which is applied in the field of high-density ceramic materials and their preparation, can solve the difficulty in meeting the complex and diversified requirements of the sample shape, the application and development obstacles of thermal protection of aerospace vehicles, the difficulty in bearing mechanical impact and Thermal shock and other problems, to achieve the effect of promoting sintering, tight inter-particle occlusion, and increasing the density of the green body

Active Publication Date: 2022-05-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the LaMgAl 11 o 19 Strong sintering resistance and high sintering temperature, it is difficult to achieve sintering densification under conventional molding and sintering processes
The existence of pores between grains makes it prone to brittle fracture during the working process, resulting in poor thermal shock resistance, and it is difficult to withstand large mechanical and thermal shocks
Although new sintering techniques such as hot pressing sintering and spark plasma sintering can be used to prepare high-density LaMgAl 11 o 19 Ceramics, but limited by the mold, these methods can only prepare samples with simple shapes, which are difficult to meet the complex and diverse requirements for sample shapes in practical applications
Although conventional pressureless sintering can prepare LaMgAl with corresponding shapes according to different requirements, 11 o 19 Sample, but the product density is not high (only 70% to 80%)
In view of the above factors, LaMgAl 11 o 19 Applications and developments in the thermal protection of aerospace vehicles and industrial furnaces are severely hampered

Method used

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

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preparation example Construction

[0030] The present invention provides a preparation method for the high-density ceramic material described in the above technical solution, comprising the following steps:

[0031] Mixing lanthanum source, magnesium source, transition metal oxide, iron source, cobalt source, nickel source and aluminum source, carrying out stage-by-stage pressure-holding molding to obtain a green body; the lanthanum source, magnesium source, transition metal oxide, iron The molar ratio of lanthanum element, magnesium element, transition metal element, iron element, cobalt element, nickel element and aluminum element in source, cobalt source, nickel source and aluminum source is 1:(0.4-x):x:0.2:0.2: 0.2:11, 0

[0032] Sintering the green body without pressure to obtain a high-emissivity high-entropy ceramic material;

[0033] The step-by-step pressure-holding molding process includes: the first stage: the molding pressure is 2...

Embodiment 1

[0050] La 2 o 3 Powder (average particle size 0.5 μm, purity ≥ 99.9%), FeO powder (average particle size 0.5 μm, purity ≥ 99.9%), CoO powder (average particle size 0.5 μm, purity ≥ 99.9%), NiO powder (average particle size 0.5μm, purity ≥ 99.9%), ZnO powder (average particle size 0.5μm, purity ≥ 99.9%), Al 2 o 3 Powder (average particle size 0.5 μm, purity ≥ 99.9%) and MgO powder (average particle size 0.5 μm, purity ≥ 99.9%) according to La (Mg 0.2 Zn 0.2 Fe 0.2 co 0.2 Ni 0.2 ) Al 11 o 19 The stoichiometric ratio is batched, where La 2 o 3 , FeO powder, CoO powder, NiO powder, ZnO powder, Al 2 o 3 The molar ratio of the powder and the MgO powder is respectively 1:0.4:0.4:0.4:0.4:11:0.4, and the obtained mixture is mixed with absolute ethanol to carry out wet ball milling, the ball milling speed is 280rpm, and the ball milling time is 18h, dark brown mixed powder was obtained;

[0051] Put the dark brown mixed powder into a stainless steel mould, first place the ...

Embodiment 2

[0054] La 2 o 3 Powder (average particle size 0.5 μm, purity ≥ 99.9%), FeO powder (average particle size 0.5 μm, purity ≥ 99.9%), CoO powder (average particle size 0.5 μm, purity ≥ 99.9%), NiO powder (average particle size 0.5μm, purity ≥ 99.9%), CuO powder (average particle size 0.5μm, purity ≥ 99.9%), Al 2 o 3 Powder (average particle size 0.5 μm, purity ≥ 99.9%) and MgO powder (average particle size 0.5 μm, purity ≥ 99.9%) according to La (Mg 0.2 Cu 0.2 Fe 0.2 co 0.2 Ni 0.2 ) Al 11 o 19 The stoichiometric ratio is batched, where La 2 o 3 , FeO powder, CoO powder, NiO powder, CuO powder, Al 2 o 3 The molar ratio of the powder and the MgO powder is respectively 1:0.4:0.4:0.4:0.4:11:0.4, the mixture obtained is mixed with absolute ethanol, and wet ball milled, the ball milling speed is 250rpm, and the ball milling time is 24h, Obtain dark brown mixed powder;

[0055] The dark brown mixed powder is first placed in the mold under a pressure of 3.2MPa and maintained...

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Abstract

The invention provides a high-density ceramic material and its preparation method and application, belonging to the technical field of ceramic materials. The high-density ceramic material provided by the invention has a chemical composition of: La(Mg 0.4‑x tm x Fe 0.2 co 0.2 Ni 0.2 ) Al 11 o 19 , where TM is Cu or Zn; 0

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a high-density ceramic material and its preparation method and application. Background technique [0002] LaMgAl 11 o 19 Because of its high melting point, low density, low thermal conductivity and large thermal expansion coefficient, ceramics have become promising thermal protection materials for aerospace vehicles and lining materials for industrial kilns. According to the current application requirements, the materials promoted in the above fields need to have a long thermal cycle life and be able to withstand large thermal shocks. However, due to the LaMgAl 11 o 19 Strong sintering resistance and high sintering temperature, it is difficult to achieve sintering densification under conventional molding and sintering processes. The existence of pores between grains makes it prone to brittle fracture during the working process, resulting in poor thermal shock resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/44C04B35/622
CPCC04B35/50C04B35/44C04B35/622C04B2235/3227C04B2235/3206C04B2235/3272C04B2235/3275C04B2235/3279C04B2235/3217C04B2235/6562C04B2235/6567C04B2235/77
Inventor 刘玲马壮柳彦博朱皓麟
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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