A low thermal conductivity, high fracture toughness aerospace thermal barrier material and its preparation

An aerospace, low thermal conductivity technology, applied in high fracture toughness aerospace thermal barrier materials and its preparation, low thermal conductivity field, can solve high sintering temperature, material fracture toughness and thermal conductivity are difficult to achieve common improvement, sintering Long time and other problems, to achieve the effect of lowering the sintering temperature, shortening the sintering time, and high fracture toughness

Active Publication Date: 2022-04-19
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high sintering temperature and long sintering time of the high-entropy oxide ceramics reported so far make it difficult to improve the fracture toughness and thermal conductivity of the material.

Method used

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  • A low thermal conductivity, high fracture toughness aerospace thermal barrier material and its preparation
  • A low thermal conductivity, high fracture toughness aerospace thermal barrier material and its preparation
  • A low thermal conductivity, high fracture toughness aerospace thermal barrier material and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Preparation (ZrO 2 ) 1 (CeO 2 ) 1 (HfO 2 ) 1 (Y 2 o 3 ) 0.5 (Sm 2 o 3 ) 0.5 , corresponding to (Zr 1 Ce 1 f 1 Y 1 SM 1 )O 9 High entropy oxides:

[0035](1) Powder mixing: Weigh ZrO according to the atomic ratio of 1:1:1:0.5:0.5 2 , CeO 2 , HfO 2 , Y 2 o 3 、Sm 2 o 3 Powder (particle size 0.5μm, purity ≥ 99.9%), put it into a ball mill jar for ball milling, add 1mL absolute ethanol per 100g of mixed powder as the grinding medium, and the grinding ball is ZrO 2 Balls, the ball-to-material ratio (g / g) is 0.5:1, the ball milling speed is 100r / min, and the ball milling time is 5h. After ball milling, it is dried in a drying oven. After grinding, it is sieved with 100 meshes to obtain a uniformly mixed raw powder. products.

[0036] (2) Sintering: Put the product obtained in step (1) into a graphite mold, and then place it in an SPS discharge plasma sintering furnace for sintering. The sintering temperature is 1550°C, the heating rate is 60°...

Embodiment 2

[0042] Example 2 Preparation (ZrO 2 ) 0.75 (CeO 2 ) 1.25 (HfO 2 ) 1 (Y 2 o 3 ) 0.3 (Sm 2 o 3 ) 0.45, Corresponding (Zr 0.75 Ce 1.25 f 1 Y 0.6 SM 0.9 )O 8.25 High entropy oxides:

[0043] (1) Powder mixing: Weigh ZrO according to the atomic ratio of 0.75:1.25:1:0.3:0.45 2 , CeO 2 , HfO 2 , Y 2 o 3 、Sm 2 o 3 Powder (particle size 30μm, purity ≥ 99.5%), put it into a ball mill jar for ball milling, add 5mL of absolute ethanol per 100g of mixed powder as the grinding medium, and the grinding ball is ZrO 2 Balls, the ball-to-material ratio is 5:1, the ball milling speed is 300r / min, and the ball milling time is 24h. After ball milling, it is dried in a drying oven. After grinding, it is sieved with 200 meshes to obtain a uniformly mixed original powder product.

[0044] (2) Sintering: Put the product obtained in step (1) into a graphite mold, and then place it in an SPS discharge plasma sintering furnace for sintering. The sintering temperature is 1750°C, th...

Embodiment 3

[0050] Example 3 Preparation (ZrO 2 ) 1 (CeO 2 ) 0.75 (HfO 2 ) 1.25 (Y 2 o 3 ) 0.6 (Nd 2 o 3 ) 0.65, Corresponding (Zr 1 Ce 0.75 f 1.25 Y 1.2 Nd 1.3 )O 9.75 High entropy oxides:

[0051] (1) Powder mixing: Weigh ZrO according to the atomic ratio of 1:0.75:1.25:0.6:0.65 2 , CeO 2 , HfO 2 , Y 2 o 3 、Nd 2 o 3 Powder (particle size 10μm, purity ≥ 99.5%), put it into a ball mill jar for ball milling, add 3mL of absolute ethanol per 100g of mixed powder as the grinding medium, and the grinding ball is ZrO 2 Balls, the ball-to-material ratio is 3:1, the ball milling speed is 200r / min, and the ball milling time is 12h. After the ball milling, it is dried in a drying oven. After grinding, it is sieved with 150 meshes to obtain a uniformly mixed original powder product.

[0052] (2) Sintering: Put the product obtained in step (1) into a graphite mold, and then place it in an SPS discharge plasma sintering furnace for sintering. The sintering temperature is 1600°C...

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Abstract

The invention relates to a thermal barrier material for aerospace with low thermal conductivity and high fracture toughness. The composition of the material in terms of atomic ratio is (ZrO 2 )a(CeO 2 )b(HfO 2 )c(Y 2 o 3 )d(A 2 o 3 )e, corresponding to (Zr a Ce b f c Y 2d A 2e )O f , where A is Sm or Nd, a=0.75~1.25, b=0.75~1.25, c=0.75~1.25, d+e=0.75~1.25, d and e are near equiatomic ratios, f=2(a+b +c)+3(d+e). The invention also discloses a preparation method of the thermal barrier material. While ensuring high lattice distortion solid solution, the invention reduces grain size and promotes the formation of nano-precipitated phase, so as to realize the improvement of fracture toughness and the reduction of thermal conductivity.

Description

technical field [0001] The invention relates to the field of thermal barrier coating materials, in particular to an aerospace thermal barrier material with low thermal conductivity and high fracture toughness and its preparation. Background technique [0002] Thermal barrier coatings can effectively protect key components such as turbine engines, rocket casings and manned cabins, ensuring the stable operation of engines and the completion of aerospace tasks. However, in order to realize manned spaceflight, the existing thermal barrier materials are insufficient, and it is difficult to meet the application requirements. [0003] YSZ material, which is widely used in thermal barrier materials in my country, still has a high intrinsic thermal conductivity (3.99~4.51 W.m -1 .K -1 ). However, the rare earth zirconate materials that are currently considered to replace YSZ have low fracture toughness (such as La 2 Zr 2 o 7 and Nd 2 Zr 2 o 7 0.89 MPa·m 1 / 2 、0.67 MPa·m 1 / 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622C04B35/645
CPCC04B35/48C04B35/622C04B35/645C04B2235/3244C04B2235/3229C04B2235/3225C04B2235/3224C04B2235/5445C04B2235/602C04B2235/666C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/662C04B2235/96C04B2235/9607
Inventor 乔竹辉周峰郭旭鑫刘维民于源张立志马雯雯刘炯杰
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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