Preparation method of tetravalent ion-doped toughened hafnium oxide-based high-temperature thermal protection material

An ion doping and protective material technology, applied in the field of high temperature thermal protection, can solve the problems of YSZ sintering and material damage, and achieve the effect of good high temperature phase stability and good fracture toughness
CN110835264AInactive Publication Date: 2020-02-25BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2020-02-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a preparation method of a tetravalent ion-doped toughened hafnium oxide-based high-temperature thermal protection material, and the product obtained therethrough. The preparedthermal protection material is a yttrium oxide and tetravalent oxide co-doped hafnium oxide material system, the chemical composition of the material is (Hf1-xLnx)0.92Y0.08O1.96, and Ln is selected from Ti, Sn or Th. The material has the characteristics of high phase stability, high toughness and low thermal conductivity high fracture toughness can be guaranteed when the material is used as a thermal protection material, and when x is 0.25, the highest fracture toughness can reach 3.62 MPa.m<1 / 2>, meanwhile, the low thermal conductivity of about 1.8 W / (m*K) is kept at 1200 DEG C, and phase change does not occur within 1400 DEG C. The yttrium oxide and titanium oxide co-doped stable hafnium oxide material has good high-temperature phase stability, and can be used for designing and preparinghigh-temperature thermal protection material with the use temperature of 1400 DEG C or above.
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Description

technical field

[0001] The invention belongs to the technical field of high-temperature thermal protection, and specifically relates to a preparation method of a hafnium oxide-based thermal protection material with high-temperature thermal stability, high fracture toughness, and low thermal radiation conversion and a product thereof. Background technique

[0002] High temperature will seriously damage the strength and other properties of metal materials and affect their service life. Especially in the field of aerospace, the development of new thermal protection materials that can serve in complex thermal environments is an effective way to solve the problem. The heat protection material greatly reduces the surface temperature of the superalloy by using its low thermal conductivity, enhances the high temperature oxidation resistance of the hot end parts, and prolongs the service life of the hot end parts. However, ceramics usually have extremely low fracture toughness, which...

Claims

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