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Preparation of multi-principal abo by liquid phase combustion 3 A method for perovskite-structured ceramics
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A perovskite structure and liquid phase combustion technology, which is applied in the field of multi-principal ceramic powder materials, can solve the problems of coarse ceramic raw powder particles, uneven microstructure, and affecting the structural and functional characteristics of materials.
Active Publication Date: 2022-03-01
CHANGZHOU UNIV
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This report verified the feasibility of preparing high-entropy materials with complex ionic crystal structures with at least two cation lattices by solid-phase method, but the ceramic raw material powder particles prepared by solid-phase method are relatively coarse, and the density of ceramics is low. This leads to a large number of defects and pores inside the ceramic, and the microstructure is uneven, which will directly affect the structure and final functional properties of the material
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Embodiment 1
[0025] (1) Take Sr(Zr 0.2 sn 0.2 Ti 0.2 Nb 0.2 Tb 0.2 )O 3 is the target product, when Zr, Sn, Ti, Nb, Tb jointly occupy the B site, the tolerance factor is 0.97;
[0026] (2) Weigh 19.3g of ammoniumniobiumoxalate, add 200ml of deionized water, and stir magnetically for 30 minutes, then filter out the insolubles to obtain ammoniumniobiumoxalate solution; measure the concentration of ammoniumniobiumoxalate solution by atomic spectroscopy, constant volume, and configure into 0.5mol / L ammonium niobium oxalate solution;
[0027] (3) Weigh the metal nitrates of Zr, Sn, Ti, and Tb according to the equimolar ratio, dissolve them in distilled water, add nitric acid dropwise, control the pH value of the solution to 2-4, and then mix it with ammonium niobium oxalate solution, Stir to obtain a 0.5mol / L B-site metal salt mixed solution;
[0034] (1) Take Sr(Zr 0.2 sn 0.2 Ti 0.2 Nb 0.2 mn 0.2 )O 3 is the target product, when Zr, Sn, Ti, Nb, and Mn jointly occupy the B site, the tolerance factor is 0.97;
[0035] (2) Weigh 19.3g of ammonium niobium oxalate, add 200ml of deionized water, and stir magnetically for 30 minutes, then filter out the insolubles to obtain ammonium niobium oxalate solution; measure the concentration of ammonium niobium oxalate solution by atomic spectroscopy, constant volume, and configure into 0.5mol / L ammonium niobium oxalate solution;
[0036] (3) Weigh the metal nitrates of Zr, Sn, Ti, and Mn respectively according to the equimolar ratio, dissolve them in distilled water, add nitric acid dropwise, control the pH value of the solution to 2-4, and then mix it with ammonium niobium oxalate solution, Stir to obtain a 0.5mol / L B-site metal salt mixed solution;
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Abstract
The invention belongs to the field of multi-principal elementceramic materials, and in particular relates to a preparation of multi-principal element ABO by liquid phasecombustion 3 Method for high-entropy ceramics with perovskite structure, wherein A is Sr and B is Zr 0.2 sn 0.2 Ti 0.2 Nb 0.2 m 0.2 , M=Mn, Tb. By precisely controlling the proportion of each cationic raw material, the reactants are uniformly mixed in the liquid phasesol state to obtain a uniform solution, and the temperature is raised to form a gel; then the mixture gel undergoes a combustion reaction to obtain a honeycomb fluffy precursor. After full combustion, high-entropy ceramicpowder is obtained. By controlling the concentration of raw materials and the addition of combustion agent, the multi-principal ceramic superfine powder with uniform particle size distribution is obtained.
Description
technical field [0001] The invention belongs to the field of multi-principal ceramic powder materials, and in particular relates to a preparation of multi-principal ABO by liquid phase combustion 3 A method for high-entropy ceramics of perovskite-structured composite oxides. Background technique [0002] The concept of high entropy was first proposed by Taiwan scientist Ye Junwei in 1995. He believed that when four to five or even more elements were mixed in the same proportions, there were a large number of possible arrangements of different atoms, resulting in disorder (high entropy), eliminating any possibility of forming a regular performance crystal structure, thereby creating very hard material. High-entropy alloys, also known as multi-principal alloys, contain more than five main elements, and there is no dominant element. It is the result of the joint action of multiple elements, and each element is between 5% and 35%, showing excellent strength and hardness. , we...
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