Compact pure-phase lanthanum zirconate ceramic with low thermal conductivity and high strength, and preparation method thereof

A technology of phase lanthanum zirconate and low thermal conductivity, which is applied in the field of high-strength dense pure phase lanthanum zirconate ceramics and its preparation, and low thermal conductivity. It can solve the problem that thermal conductivity and mechanical strength are difficult to meet actual needs, low thermal conductivity, etc. problems, to meet the requirements of heat insulation performance and mechanical bearing performance, long service life, simple and easy preparation method
CN103803973AActive Publication Date: 2014-05-21ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2014-05-21

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Abstract

The invention discloses compact pure-phase lanthanum zirconate ceramic with low thermal conductivity and high strength, and a preparation method thereof. A chemical formula of the lanthanum zirconate ceramic is La2Zr2O7, the compactness is greater than 85%, the compression strength is 310-500MPa, the thermal conductivity and the thermal diffusion coefficient at normal temperature respectively are 1.55-1.79W / (m.K) and (0.90-0.76)*10<-6>m<2> / s; the thermal conductivity and the thermal diffusion coefficient at the temperature of 1200 DEG C respectively are 0.75-0.94W / (m.K) and (0.35-0.45)*10<-6>m<2> / s; the breaking tenacity is 1.45-1.70MPa. The lanthanum zirconate ceramic prepared according to the lanthanum zirconate ceramic preparation method provided by the invention has the advantages of low thermal conductivity, high melting point, good inoxidizability, excellent mechanical property, good high temperature-phase stability and the like, and the requirements of hypersonic velocity aerospace vehicles on the performances of high-strength thermal insulation ceramic materials can be met.
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Description

technical field

[0001] The invention relates to the technical field of ceramic materials, in particular to a low-thermal-conductivity, high-strength dense pure-phase lanthanum zirconate ceramic and a preparation method thereof. Background technique

[0002] With the continuous development of aerospace technology, when the aircraft is in working condition, the heat generated by aerodynamics will cause more and more serious heating effects on the airframe. For example, the temperature at the leading edge of the wing or empennage is as high as 1455°C. There will be a large temperature gradient in the thickness direction of the thermal protection system of the aircraft. Due to the large difference in material properties between the aircraft connector and the thermal protection layer, thermal bridges with uneven temperature distribution will occur in different layers. This will lead to a decrease in the stiffness of the airframe structure, and generate thermal stress in the mater...

Claims

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