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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

Inactive Publication Date: 2020-02-25
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous development of the aerospace industry, the operating temperature of aero-engines is getting higher and higher. When the service temperature exceeds 1200 ° C, the traditional thermal protection material 6-8wt% YSZ will undergo an irreversible phase transition, from monoclinic phase to During the transformation of the tetragonal phase, 3-5% volume shrinkage will occur, which will lead to the destruction of the material. In addition, the high temperature will also cause the sintering phenomenon of YSZ

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: (Hf 0.95 Ti 0.05 ) 0.92 Y 0.08 o 1.96 Preparation of Ceramic Blocks

[0021] (1) Weigh 0.3736g of titanium oxide powder of 99.9% purity, 18.7079g of hafnium oxide powder of 99.9% purity, 0.9185g of yttrium oxide powder of 99.9% purity and add in the ball mill jar, and add alcohol, zirconia grinding ball 100g altogether, Among them, 40g of 10mm grinding balls, 30g of 5mm grinding balls, and 30g of 1mm grinding balls, set the speed of the ball mill to 400r / min, and mill for 10 hours;

[0022] (2) Put the ball-milled slurry into a draft drying oven at 60°C for 10 hours, then grind the dried powder and sieve it with a 200-mesh sieve to obtain a powder with a particle size of less than 0.0750 mm;

[0023] (3) Press the powder obtained in the previous step into a disc of φ15mm×2mm, press 20MPa, hold the pressure for 2 minutes, and finally put the obtained disc into a resistance furnace for pressureless sintering. The sintering parameter is from room tempera...

Embodiment 2

[0025] Embodiment 2: (Hf 0.9 Ti 0.1 ) 0.92 Y0.08 o 1.96 Preparation of Ceramic Blocks

[0026] (1) Weigh 0.7707g of titanium oxide powder of 99.9% purity, 18.2818g of hafnium oxide powder of 99.9% purity, 0.9475g of yttrium oxide powder of 99.9% purity and add it to the ball mill jar, and add 120ml of 75% alcohol, and zirconia grinding balls A total of 100g, including 40g of 10mm balls, 30g of 5mm balls, and 30g of 1mm balls, set the speed of the ball mill to 400r / min, and mill for 10 hours;

[0027] (2) Put the ball-milled slurry into a draft drying oven at 60°C for 10 hours, then grind the dried powder and sieve it with a 200-mesh sieve to obtain a powder with a particle size of less than 0.0750 mm;

[0028] (3) Press the powder obtained in the previous step into a disc of φ15mm×2mm, press 20MPa, hold the pressure for 2 minutes, and finally put the obtained disc into a resistance furnace for pressureless sintering. The sintering parameter is from room temperature to 1000...

Embodiment 3

[0030] Embodiment 3: (Hf 0.85 Ti 0.15 ) 0.92 Y 0.08 o 1.96 Preparation of Ceramic Blocks

[0031] (1) Weigh 1.1937g of titanium oxide powder of 99.9% purity, 17.8280g of hafnium oxide powder of 99.9% purity, 0.9783g of yttrium oxide powder of 99.9% purity and add it to the ball mill jar, and add 120ml of 75% alcohol, and zirconia grinding balls A total of 100g, including 40g of 10mm balls, 30g of 5mm balls, and 30g of 1mm balls, set the speed of the ball mill to 400r / min, and mill for 10 hours;

[0032] (2) Put the ball-milled slurry into a draft drying oven at 60°C for 10 hours, then grind the dried powder and sieve it with a 200-mesh sieve to obtain a powder with a particle size of less than 0.0750 mm;

[0033] (3) Press the powder obtained in the previous step into a disc of φ15mm×2mm, press 20MPa, hold the pressure for 2 minutes, and finally put the obtained disc into a resistance furnace for pressureless sintering. The sintering parameter is from room temperature to ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/626C04B35/64
CPCC04B35/488C04B35/6261C04B35/64C04B2235/3225C04B2235/3232C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/668C04B2235/76C04B2235/762C04B2235/96C04B2235/9607
Inventor 郭洪波马芳德李春马岳宫声凯徐惠彬
Owner BEIHANG UNIV
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