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High-toughness multiphase ceramic material as well as preparation method and application thereof

A technology of composite phase ceramics and high toughness, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of low fracture toughness, short service life and low reliability of thermal barrier coatings, and achieve low thermal conductivity, high fracture toughness, and high density

Active Publication Date: 2021-03-02
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of high-toughness composite phase ceramic material, to solve cubic phase pyrochlore (or fluorite) rare earth zirconate RE 2 Zr 2 o 7 The prepared thermal barrier coating has low fracture toughness at high temperature, resulting in technical problems of low reliability and short service life

Method used

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  • High-toughness multiphase ceramic material as well as preparation method and application thereof
  • High-toughness multiphase ceramic material as well as preparation method and application thereof
  • High-toughness multiphase ceramic material as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0036] A method for preparing a high-toughness composite ceramic material, comprising the following steps:

[0037] (1) Combine lanthanum zirconate powder and neodymium aluminate (NdAlO) with a particle size not exceeding 5 μm 3 ) powders are mixed according to the molar ratio of x:(1-x); wherein, the value of x is 0.1; NdAlO 3 The Curie temperature is 1367°C;

[0038] (2) Add the mixed powder into a ball mill tank, and ball mill at a speed of 200-450 rpm for 5-24 hours to obtain a mixed slurry with a particle size of 1-5 μm;

[0039] (3) Spray-dry the above mixed slurry at 80-100° C. for 2-4 hours to obtain a spherical powder with a particle size of 20-40 μm. The powder is put into a mold with a diameter of 40mm, and spark plasma sintering is carried out. The sintering process is as follows: the temperature is raised to the sintering temperature of 1500-1600°C at a heating rate of 100-120K / min, and the temperature is kept at a pressure of 30-50MPa for 5-15min, that is, a c...

Embodiment 2-5

[0041] The main difference between Examples 2-5 and Example 1 is that the values ​​of x are respectively 0.2, 0.3, 0.4, and 0.5, and the others are the same as in Example 1 to obtain xNdAlO 3 / (1-x)La 2 Zr 2 o 7 Composite ceramics.

Embodiment 6

[0043] A method for preparing a high-toughness composite ceramic material, comprising the following steps:

[0044] (1) Combine lanthanum zirconate powder and praseodymium aluminate (PrAlO 3 ) powder is mixed according to the molar ratio of x:(1-x); wherein, the value of x is 0.2; praseodymium aluminate (PrAlO 3 ) has a Curie temperature of 1047°C;

[0045] (2) Add the mixed powder into a ball mill tank, and ball mill at a speed of 200-450 rpm for 5-24 hours to obtain a mixed slurry with a particle size of 1-5 μm;

[0046] (3) Spray-dry the above mixed slurry at 80-100° C. for 2-4 hours to obtain a spherical powder with a particle size of 20-40 μm. The powder is put into a mold with a diameter of 40mm, and spark plasma sintering is carried out. The sintering process is as follows: the temperature is raised to the sintering temperature of 1500-1600°C at a heating rate of 100-120K / min, and the temperature is kept at a pressure of 30-50MPa for 5-15min, that is, a cylindrical b...

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Abstract

The invention provides a high-toughness multiphase ceramic material as well as a preparation method and application thereof. The high-toughness multiphase ceramic material comprises rare earth zirconate and rare earth aluminate with high Curie temperature, the rare earth aluminate is distributed in the rare earth zirconate, and the Curie temperature of the rare earth aluminate is not lower than 1000 DEG C. The rare earth aluminate contains a plurality of randomly oriented ferroelastic domains, when the stress applied by the outside is higher than the coercive force, the C axis of the ferroelastic domains tends to turn to the direction parallel to the external stress or perpendicular to the crack propagation direction, and the ferroelastic domains can effectively consume the crack propagation energy during turning. According to the high-toughness multiphase ceramic material provided by the invention, the rare earth aluminate with high Curie temperature is introduced into the rare earthzirconate matrix as a toughening phase, so that the prepared ceramic material still has high fracture toughness and low thermal conductivity at a high temperature of 1000 DEG C or above, and has a very wide application prospect as a thermal barrier coating.

Description

technical field [0001] The invention relates to the technical field of high-temperature composite ceramics and its preparation, in particular, to a high-toughness composite ceramic material and its preparation method and application. Background technique [0002] Thermal barrier coating (TBC) refers to a ceramic coating deposited on the surface of metal parts with good heat insulation effect. This coating can reduce the working temperature of the substrate, protect the metal substrate from high-temperature gas erosion, and improve its high-temperature operation The role of life. Thermal barrier coatings are mainly used for thermal protection of hot end components. Thermal barrier coating materials need to have low thermal conductivity, high melting point and high chemical stability, a thermal expansion coefficient that matches the metal substrate, and good anti-sintering performance. [0003] The widely used thermal barrier coating material is mainly yttria stabilized zirc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/48C04B35/626C23C4/11C23C4/134C04B35/622
CPCC04B35/50C04B35/48C04B35/62615C04B35/62695C04B35/62665C04B35/62222C23C4/134C23C4/11C04B2235/3222C04B2235/96
Inventor 王衍飞刘荣军万帆杜金平
Owner NAT UNIV OF DEFENSE TECH
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