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Superfine high-entropy solid solution powder as well as preparation method and application thereof

A technology of solid solution and powder, which is applied in the field of ultrafine high-entropy solid solution powder and its preparation, can solve the problems of difficult preparation of raw material fine powder and large particle size of powder, and achieve small particle size, uniform and stable components, The effect of good particle size distribution

Active Publication Date: 2019-03-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The only reported synthesis of high-entropy boride ceramics uses a variety of commercially purchased borides, which are sintered after high-energy ball milling. The powder particle size is relatively large. Therefore, the synthesis of raw material fine powder and the preparation of single-phase high-entropy ceramics still exist. difficulty
Although the patent CN201611021565.3 also prepared finer boride powders, this patent only solid-dissolves a small amount of borides to realize the synthesis of single transition metal boride fine powders, and does not belong to the field of high-entropy ceramics

Method used

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  • Superfine high-entropy solid solution powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. With HfO 2 (powder purity 99.9%, particle size 1μm), ZrO 2 (powder purity 99.9%, particle size 1μm), Nb 2 o 5 (powder purity 99.9%, particle size 2μm), TiO 2 (powder purity 99.9%, particle size 1μm) and MoO 3 (The purity of the powder is 99.9%, particle size 1 μm) The powder is proportioned in equal atomic proportions, and mixed with amorphous boron powder (purity 95.6%, particle size 1 μm) according to the excess 10wt% of the above-mentioned oxide mixed total amount according to the metering ratio.

[0029] 2. Amorphous boron powder and HfO 2 , ZrO 2 and TiO 2 The molar ratios are 3.67:1, amorphous boron powder and Nb 2 o 5 The molar ratio is 8.067:1, amorphous boron powder and MoO 3 The molar ratio is 4.4:1. With ethanol as solvent, Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0030] 3. Put the final green body after the mixed powder molding...

Embodiment 2

[0033] 1. With HfO 2 (powder purity 99.9%, particle size 2μm), ZrO 2 (powder purity 99.9%, particle size 2μm), Nb 2 o 5 (powder purity 99.9%, particle size 2μm), TiO 2 (powder purity 99.9%, particle size 2μm) and Ta 2 o 5 (Powder purity 99%, particle size 2 μm) powder powder is mixed with amorphous boron powder (purity 96%, particle size 2 μm) according to the excess 10wt% of the above-mentioned oxide mixed total amount according to the metering ratio.

[0034] 2. Amorphous boron powder and HfO 2 , ZrO 2 and TiO 2 The molar ratio is 3.67:1, amorphous boron powder and Ta 2 o 5 and Nb 2 o 5 The molar ratio is 8.067:1. With ethanol as solvent, Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0035] 3. Put the molded green body of the mixed powder into a graphite crucible, raise the temperature to 1200°C at a heating rate of 10°C / min and keep it for 1 hour, t...

Embodiment 3

[0038] 1. With HfO 2 (powder purity 99%, particle size 8μm), ZrO 2 (powder purity 99%, particle size 8μm), Cr 2 o 3 (powder purity 99%, particle size 8μm), TiO 2 (powder purity 99%, particle size 5μm) and Ta 2 o 5 (99% of the purity of the powder, 8 μm of particle diameter) powder powder is mixed with amorphous boron powder (96% of purity, 8 μm of particle diameter) according to the excess 10wt% of the above-mentioned oxide mixed total amount according to the metering ratio .

[0039] 2. Amorphous boron powder and HfO 2 , ZrO 2 and TiO 2 The molar ratio is 3.67:1, amorphous boron powder and Ta 2 o 5 The molar ratio of both is 8.067:1, amorphous boron powder and Cr 2 o 3 The molar ratio is 8.8:1. With ethanol as solvent, Si 3 N 4 The ball is the ball milling medium, and it is mixed on a roller ball mill for 24 hours, and the mixed powder is obtained after mixing and drying.

[0040] 3. Put the molded green body of the mixed powder into a graphite crucible, raise...

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Abstract

The invention belongs to the technical field of ceramic materials and discloses superfine high-entropy solid solution powder as well as a preparation method and application thereof. The solid solutionpowder is prepared by the steps of with metal oxide and amorphous boron powder as raw material powder, adding a solvent and a ball-milling medium, mixing, drying to obtain mixed powder, carrying outmold pressing on the mixed powder so as to obtain a mixed powder blank, carrying out thermal treatment under a vacuum condition, firstly heating to 800-1200 DEG C, maintaining the temperature for I, heating to 1400-1600 DEG C, maintaining the temperature for II, grinding, and sieving, wherein the oxide is one or more of HfO2, ZrO2, Nb2O5, Ta2O5, Cr2O3, TiO2 or MoO3, and the molar ratios of metal ions in the metal oxide are the same. The solid solution powder has a uniform solid solution phase and further has the advantages of small particle size and uniform and stable components.

Description

technical field [0001] The invention belongs to the technical field of ceramic materials, and more specifically relates to an ultrafine high-entropy solid melt powder and its preparation method and application. Background technique [0002] In recent years, the research on the fabrication and properties of metallic high-entropy alloys (HEAs) has aroused the interest of many researchers. As a structural material, HEAs are widely used in high-temperature applications, hydrogen storage materials, anti-radiation materials, electronics, precision resistance electromagnetic shielding materials, soft magnetic materials, thermoelectric functional coatings, and antibacterial materials. Generally, five or more elements can be mixed in the same concentration of metal high-entropy alloys to generate the maximum molar coordination entropy. Due to the increase in components, the combination space for exploring and discovering new materials is greatly increased. But most components do no...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/626
CPCC04B35/58064C04B35/6265C04B35/62675C04B35/6268C04B2235/5436C04B2235/3251C04B2235/3256C04B2235/3232C04B2235/3244C04B2235/421
Inventor 郭伟明张岩吴利翔谭大旺林华泰
Owner GUANGDONG UNIV OF TECH
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