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Preparation method of rock salt type (MgCoCuNiZn)O high entropy oxide powder material

An oxide powder, rock salt type technology, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of high energy consumption and complex preparation process, achieve uniform distribution, simple and easy process, and high production efficiency Effect

Active Publication Date: 2018-12-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This method uses mechanical ball milling to mix various oxides evenly, which inevitably has defects such as high energy consumption and ball milling media will pollute the prepared powder materials.
In addition, people such as A.Sarkar of Germany have also proposed the method (A.Sarkar, R.Djenadic, N.J.Usharani, K.P.Sanghvi, V.S.K.Chakravadhanula, A.S.Gandhi, H.Hahn, S.S.Bhattacharya, Nanocrystalline multicomponent entropy stabilized transition metal oxides, Journal of the European Ceramic Society, 37 (2017) 747-754.), this method also has complex preparation process, high energy consumption shortcoming
At present, there are no relevant reports on the preparation of high-entropy alloy powder materials by low-temperature combustion synthesis

Method used

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  • Preparation method of rock salt type (MgCoCuNiZn)O high entropy oxide powder material
  • Preparation method of rock salt type (MgCoCuNiZn)O high entropy oxide powder material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 12.82g of Mg(NO 3 ) 2 .6H 2 O, 14.55g of Co(NO 3 ) 2 .6H 2 O, 12.08g of Cu(NO 3 ) 2 .3H 2 O, 14.54g of Ni(NO 3 ) 2 .6H 2 O and 14.87g of Zn(NO 3 ) 2 .6H 2 O was dissolved in 62.5mL of distilled water and stirred evenly to obtain a mixed solution containing metal salts; then 75.05g of tartaric acid and 2.25g of ammonium nitrate were weighed and added to the above mixed solution, after stirring evenly, the pH of the mixed solution was adjusted to 7 with ammonia water to obtain a transparent Then heat the above transparent sol in an oil bath at 150°C to remove the solvent water to obtain a loose, foamy gel; finally place the above gel in a muffle furnace at 300°C for 30 minutes to obtain a rock salt type Crystal structure (such as figure 1 shown), the spherical rock-salt structure (MgCoCuNiZn)O high-entropy oxide nanopowder material with an average particle size of 25 nm (such as figure 2 shown).

Embodiment 2

[0023] Weigh 12.82g of Mg(NO 3 ) 2 .6H 2 O, 14.55g of Co(NO 3 ) 2 .6H 2 O, 12.08g of Cu(NO 3 ) 2 .3H 2 O, 14.54g of Ni(NO 3 ) 2 .6H 2 O and 14.87g of Zn(NO 3 ) 2 .6H 2 O was dissolved in a solvent composed of 42.5mL distilled water and 7.5mL ethanol, and stirred evenly to obtain a mixed solution containing metal salts; then 86.45g of citric acid was weighed and added to the above mixed solution, and after stirring evenly, the pH of the mixed solution was adjusted to 6 with ammonia water , to obtain a transparent sol; then heat the above transparent sol in a water bath at 80°C to remove the solvent water, and obtain a loose, foamy gel; finally place the above gel in a muffle furnace at 550°C for 15 minutes to obtain The spherical rock-salt structure (MgCoCuNiZn)O high-entropy oxide nanopowder material with an average particle size of 80nm.

Embodiment 3

[0025] Weigh 12.82g of Mg(NO 3 ) 2 .6H 2 O, 14.55g of Co(NO 3 ) 2 .6H 2 O, 12.08g of Cu(NO 3 ) 2 .3H 2 O, 14.54g of Ni(NO3 ) 2 .6H 2 O and 14.87g of Zn(NO 3 ) 2 .6H 2 O was dissolved in 33.3mL of distilled water, stirred evenly to obtain a mixed solution containing metal salts; then weighed 43.22g of citric acid, 72.06g of glucose and 1.2g of ammonium acetate into the above mixed solution, stirred evenly and adjusted the pH of the mixed solution with ammonia water 8, a transparent sol was obtained; then the above transparent sol was heated in an oil bath at 200°C to remove the solvent water, and a loose, foamy gel was obtained; finally, the above gel was placed in a microwave oven with a power of 600W to react After 5 minutes, a spherical rock-salt structure (MgCoCuNiZn)O high-entropy oxide nanopowder material with an average particle size of 120 nm was obtained.

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Abstract

Belonging to the field of high entropy oxide powder materials, the invention discloses a preparation method of a (MgCoCuNiZn)O high entropy oxide powder material with a rock salt type structure. The method is low-temperature combustion synthesis method, uses a metal nitrate as the metal source, and takes one or more of citric acid, tartaric acid and glucose with an appropriate carbon content as the fuel. The concentration of the metal salt raw material, the fuel variety and adding amount, the combustion improver variety and adding amount, and the ignition way are controlled to regulate the granularity, morphology and other characteristics of the high entropy oxide (MgCoCuNiZn)O nanopowder. According to the invention, the reactants exist in a solution, so that the raw materials in the solution can easily reach molecular level blending, and the product realizes a stoichiometric ratio. At the same time, the method provided by the invention has the advantages of energy saving, high production efficiency, simple and feasible process, green and environmental protection, no need for complex post-treatment, etc., and the prepared high entropy oxide powder has high purity and fine particlesize, and is uniformly distributed.

Description

technical field [0001] The invention belongs to the field of high-entropy oxide powder materials, in particular to a method for preparing (MgCoCuNiZn)O high-entropy oxide powder materials with a rock-salt structure by low-temperature combustion. Background technique [0002] High Entropy Alloys (HEAs) break through the traditional design concept of alloys with one or two metal elements as the main components, and are composed of five or more metal elements in equimolar or nearly equimolar ratios. Because its mixing entropy is higher than the melting entropy of the alloy, it is generally easy to form simple solid solutions with face-centered cubic (FCC), body-centered cubic (BCC) and hexagonal close-packed (HCP). High hardness, high corrosion resistance, high heat resistance, special electrical and magnetic properties and other characteristics. [0003] High-entropy oxide material is a new type of ceramic material developed on the basis of high-entropy alloys in recent years...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00
CPCC01G51/006
Inventor 冒爱琴贾洋刚李宗耀俞海云郑翠红林娜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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