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Lanthanum zirconate multiphase ceramic, and preparation method and applications thereof

A technology of multiphase ceramics and lanthanum zirconate, applied in the field of multiphase ceramics and their preparation, can solve the problems of matrix volume mismatch, coating failure, volume change, etc., achieve a small change in fracture toughness, and improve thermal expansion coefficient. , The effect of good chemical stability

Active Publication Date: 2017-12-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A lot of research work is carried out around the theme of overcoming brittleness, or toughening. Although there are many research results on the mechanism of toughening ceramics, in fact, there are not many toughened ceramics researched and developed, or even though toughened Composite ceramics are available, but their toughening mechanism is still unclear
In addition, the addition of some toughening phases may cause the thermal barrier coating to undergo volume changes during thermal cycles, resulting in volume mismatch with the matrix, or the toughening phases may occur with the matrix or ceramic base phase at high temperatures. reaction, these phenomena will seriously reduce the service life of the thermal barrier coating
For example, in the prior art, barium titanate is used to toughen lanthanum zirconate, but during the long-term thermal cycle, barium titanate will react with lanthanum zirconate, resulting in coating failure
In another case, lanthanum zirconate toughened by zirconia with tetragonal phase stabilized by yttrium oxide is used to improve the fracture toughness of lanthanum zirconate through phase transformation toughening, but the volume change can easily lead to internal stress in the coating, which promotes cracking of the coating, which is not conducive to heat treatment. Long-term use of barrier coatings

Method used

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  • Lanthanum zirconate multiphase ceramic, and preparation method and applications thereof
  • Lanthanum zirconate multiphase ceramic, and preparation method and applications thereof
  • Lanthanum zirconate multiphase ceramic, and preparation method and applications thereof

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Embodiment 1

[0028] A lanthanum zirconate composite ceramic of the present invention includes lanthanum zirconate and lanthanum aluminate. The lanthanum aluminate is dispersed in the lanthanum zirconate, and the mole fraction of the lanthanum aluminate in the composite ceramic is 10%.

[0029] A method for preparing the lanthanum zirconate composite ceramic of this embodiment described above includes the following steps:

[0030] (1) Put lanthanum zirconate powder and lanthanum aluminate powder with particle diameters not exceeding 5μm in a polyurethane ball milling tank, where the added amount of lanthanum aluminate is 10% of the total molar mixture of lanthanum zirconate and lanthanum aluminate . Put the ball milling jar in a planetary ball mill, and use zirconium beads in alcohol or water at 300 rpm for 24 hours to obtain a mixed powder slurry.

[0031] (2) Pour the mixed powder slurry in the ball mill tank into the container, and then put it into a drying box to fully remove water or alcohol...

Embodiment 2

[0036] The lanthanum zirconate composite ceramic of this embodiment includes lanthanum zirconate and lanthanum aluminate. The lanthanum aluminate is dispersed in the lanthanum zirconate, and the mole fraction of the lanthanum aluminate in the composite ceramic is 20%. The preparation method is basically the same as that of Example 1, and the only difference is that the addition amount of lanthanum aluminate is 20% of the total mixed molar amount of lanthanum zirconate and lanthanum aluminate.

Embodiment 3

[0038] The lanthanum zirconate composite ceramic of this embodiment includes lanthanum zirconate and lanthanum aluminate. The lanthanum aluminate is dispersed in the lanthanum zirconate, and the mole fraction of the lanthanum aluminate in the composite ceramic is 30%. The preparation method is basically the same as that of Example 1, and the only difference is that the addition amount of lanthanum aluminate is 30% of the total mixed mole of lanthanum zirconate and lanthanum aluminate.

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Abstract

The invention discloses a lanthanum zirconate multiphase ceramic, and a preparation method and applications thereof. The lanthanum zirconate multiphase ceramic comprises lanthanum zirconate and lanthanum aluminate, and lanthanum aluminate is dispersively distributed into lanthanum zirconate. The preparation method comprises the following steps: sintering lanthanum zirconate and lanthanum aluminate mixed powder through discharge plasma, to obtain the lanthanum zirconate multiphase ceramic. The lanthanum zirconate is toughened by lanthanum aluminate in a ferroelastic toughening manner, therefore, the lanthanum zirconate multiphase ceramic has the advantages of being high in fracture toughness, high in density, good in chemical stability and volume stability, and the like, and has wide application prospects in the application field of high-temperature thermal barrier coatings.

Description

Technical field [0001] The invention belongs to the technical field of composite ceramics and its preparation, and in particular relates to a lanthanum zirconate (La 2 Zr 2 O 7 ) Multiphase ceramics and preparation methods and applications thereof. Background technique [0002] Thermal Barrier Coating (TBC) is an advanced ceramic material system, mainly used on high-temperature metal components of gas turbines and aero engines, such as combustion chambers and turbine blades. The most commonly used thermal barrier coating is the traditional 8% mass fraction of yttria stabilized zirconia (8YSZ). With the continuous development of thermal barrier coatings, compared with traditional 8YSZ thermal barrier coatings, lanthanum zirconate is a potential new product due to its lower thermal conductivity, lower oxygen transmission rate, and higher melting point. A generation of alternative coatings. [0003] Compared with the traditional 8YSZ thermal barrier coating, lanthanum zirconate has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/622
CPCC04B35/48C04B35/50C04B35/622C04B2235/3222C04B2235/3227C04B2235/3248C04B2235/5436C04B2235/656C04B2235/6562C04B2235/6567C04B2235/666C04B2235/77C04B2235/96C04B2235/9607
Inventor 王衍飞韩敬刘荣军曹英斌赵静泽贺鹏博
Owner NAT UNIV OF DEFENSE TECH
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