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A kind of alumina-based high-entropy eutectic ceramic and preparation method thereof

A technology of eutectic ceramics and high entropy, applied in the field of eutectic ceramics preparation, can solve the problems of insufficient material density, poor stability and controllability of high-temperature microstructure, and high porosity

Active Publication Date: 2022-08-05
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional hot-pressing sintering technology is a solid-solid transition. The prepared high-entropy ceramics have structural defects such as artificial phase interfaces and glass. The porosity is slightly high, and the density of the material is not enough. Poor resistance, poor high temperature mechanical properties
Not suitable for ultra-high temperature structural materials

Method used

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  • A kind of alumina-based high-entropy eutectic ceramic and preparation method thereof
  • A kind of alumina-based high-entropy eutectic ceramic and preparation method thereof
  • A kind of alumina-based high-entropy eutectic ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] will Al 2 O 3 and Y 2 O 3 ,Er 2 O 3 ,Yb 2 O 3 , Ho 2 O 3 , Lu 2 O 3 mixture (mol% Al 2 O 3 :Y 2 O 3 =79:21, Al 2 O 3 :Er 2 O 3 =75:25, Al 2 O 3 :Yb 2 O 3 =82:12, Al 2 O 3 :Ho 2 O 3 =80.5:19.5, Al 2 O 3 :Lu 2 O 3 =82:18) Add analytical ethanol and place in a planetary ball mill to mix for 36h (the ball milling speed is 400r / min), and place the resulting mixture in a drying oven to dry at 70°C for 24h;

[0054] The powder obtained by drying was first pressed for 35min under the pressure of 30MPa, and pressed into a sample with a size of 10mm×10mm×100mm; then cold isostatic pressing was carried out under the pressure of 280MPa, and the full load was 50min to obtain a strip sample; then The obtained strip samples were sintered in a sintering furnace at 1600 °C for 2 hours in an air atmosphere to obtain a preform;

[0055] Put the preform into the furnace of the optical suspension zone, preheat by clockwise rotation at a rate of 15r / min, until ...

Embodiment 2

[0057] The difference between this example and Example 1 is that the raw material mixture is Al 2 O 3 and Er 2 O 3 (mol% Al 2 O 3 :Er 2 O 3=81:19), set the temperature gradient to 10 3 K / cm, directional solidification to obtain Al 2 O 3 / Er 3 Al 5 O 12 Eutectic ceramics.

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Abstract

The invention discloses an Al 2 O 3 Base high-entropy eutectic ceramics and preparation method thereof, firstly, mixing raw material powder and ball milling solvent, performing ball milling, drying, pressing and sintering to obtain a preform; the mixed raw material powder is Al 2 O 3 , Y 2 O 3 , Er 2 O 3 , Yb 2 O 3 , Ho 2 O 3 and Lu 2 O 3 The mixture; then the preform is directional solidified in the optical suspension zone furnace to obtain Al 2 O 3 based high-entropy eutectic ceramics. This novel high-entropy eutectic ceramic is composed of the low-entropy phase Al 2 O 3 and the high entropy phase (Y 0.2 Er 0.2 Yb 0.2 Ho 0.2 Lu 0.2 ) 3 Al 5 O 12 composition. It exhibits obvious growth anisotropy, and there is a well-defined phase-interface relationship between the low-entropy phase and the high-entropy phase. The eutectic ceramic not only has dense structure and excellent high temperature performance, but also can realize controllable structure size and performance modulation by adjusting the solidification rate.

Description

technical field [0001] The invention belongs to the technical field of eutectic ceramic preparation, in particular to a kind of Al 2 O 3 based high-entropy eutectic ceramics, also involving the Al 2 O 3 Preparation method of base high-entropy eutectic ceramics. Background technique [0002] Improving the efficiency of gas turbines is an effective way to develop high-performance aero-engines, and is crucial to the development of the aviation industry. The higher the turbine inlet temperature of the gas turbine, the greater the turbine thermal efficiency. However, an increase in the inlet temperature will cause its operating temperature to approach the temperature limit of the hot section components. In particular, turbine blades made of nickel-based superalloys have a melting point of about 1300°C and cannot work above 1150°C. Therefore, it is necessary to develop a new generation of ultra-high temperature structural materials that can operate safely for a long time at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/10C04B35/622
CPCC04B35/10C04B35/622C04B2235/3224C04B2235/3225C04B2235/3222C04B2235/96C04B2235/9607
Inventor 钟玉洁王旭
Owner XI'AN PETROLEUM UNIVERSITY