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Sesquialter rare earth sulfide high-entropy ceramic material as well as preparation method and application thereof

A technology of rare earth sulfide and ceramic materials, which is applied in the field of high-entropy rare earth sulfide ceramic materials and its preparation, can solve the problems of unsatisfactory regulation of electrical and thermal properties, high residual oxygen and carbon content, and low purity. problems, to achieve the effect of improving high-temperature electrothermal transport mechanism, low preparation temperature and high purity

Active Publication Date: 2021-12-14
SHANGHAI DIANJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a sesqui-rare earth sulfide high-entropy ceramic material and its preparation method and application, so as to solve the unsatisfactory control effect of the current multi-component sulfide high-entropy ceramic material on electrical and thermal properties, multi-component Sulfide high-entropy ceramic materials have problems with high residual oxygen and carbon content and low purity

Method used

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  • Sesquialter rare earth sulfide high-entropy ceramic material as well as preparation method and application thereof
  • Sesquialter rare earth sulfide high-entropy ceramic material as well as preparation method and application thereof
  • Sesquialter rare earth sulfide high-entropy ceramic material as well as preparation method and application thereof

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preparation example Construction

[0055] The preparation method of the sesqui-rare earth sulfide high-entropy ceramic material of the present invention comprises the following steps:

[0056] Step 1, weighing, weighing different types of rare earth element raw materials according to the proportion to form a rare earth mixed raw material;

[0057] In a specific embodiment of the present invention, the raw material of rare earth element Ln is rare earth oxide or rare earth salt; rare earth salt is any of rare earth nitrate, rare earth chloride, rare earth sulfate, rare earth carbonate or rare earth oxalate A sort of.

[0058] The particle size of rare earth oxides is not greater than 10μm, and the specific surface area is greater than 5m 2 / g; Nanoscale or micron-sized powder particles below 5μm are preferred, and the specific surface area of ​​rare earth oxide particles is 10-50m 2 / g.

[0059] In a specific embodiment of the present invention, five different types of rare earth element raw materials are wei...

Embodiment 1

[0080] A method for preparing a sesqui-rare earth sulfide high-entropy ceramic material provided in this embodiment comprises the following steps:

[0081] Weigh 0.276g Sc respectively 2 o 3 , 0.452g Y 2 o 3 , 0.652g La 2 o 3 , 0.688g CeO 2 , 0.6814gPr 6 o 11 (to meet the molar ratio of 1:1:1:1:1) into the stainless steel ball mill jar, then weigh 50g of stainless steel balls into the ball mill jar, add 150mL of absolute ethanol, then seal the ball mill jar with a sealing gasket and fix it on the planetary ball mill , set ball milling parameters: speed 140r / min, ball milling 72h, adjust forward and reverse directions every 10 minutes. After the ball milling is completed, transfer the above slurry and steel balls to a constant temperature oil bath, set the temperature at 80°C, complete the volatilization of anhydrous ethanol through slow stirring, and then sieve the obtained solid mixture to obtain the initial vulcanization Precursor.

[0082] Weigh 2g of the initial ...

Embodiment 2

[0088] A method for preparing a sesqui-rare earth sulfide high-entropy ceramic material provided in this embodiment comprises the following steps:

[0089] Weigh 0.916g La respectively 2 (CO 3 ) 3 , 0.92g Ce 2 (CO 3 ) 3 , 0.924g Pr 2 (CO 3 ) 3 , 0.936g Nd 2 (CO 3 ) 3 , 0.96g Sm 2 (CO 3 ) 3 (satisfying the molar ratio of 1:1:1:1:1) into the stainless steel ball mill jar, then weigh 50g of stainless steel balls into the ball mill jar, add 180mL of distilled water, then seal the ball mill jar with a sealing gasket and fix it on the planetary ball mill. Fixed ball milling parameters: speed 600r / min, ball milling 24h, adjust forward and reverse directions every 10 minutes. After the ball milling is completed, transfer the above slurry and steel balls to a constant temperature oil bath, set the temperature at 110°C, complete the volatilization of distilled water through slow stirring, and then sieve the obtained solid mixture to obtain the initial rare earth carbonic a...

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Abstract

The invention provides a sesquialter rare earth sulfide high-entropy ceramic material as well as a preparation method and application thereof. The chemical formula of the sesquialter rare earth sulfide high-entropy ceramic material is (Ln<1>y1Ln<2>y2Ln<3>y3 Ln<4>yLn<5>y5)Sx, wherein the rare earth element Lniyi is four or more than four selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and L[mu], and y1, y2, y3, y4 and y5 sum to 1, and x is equal to or more than 1.33 and equal to or less than 1.5. The preparation method of the sesquialter rare earth sulfide high-entropy ceramic material comprises the steps of material weighing, material mixing, calcination, vulcanization, heat treatment and sinter molding. According to the invention, prepared high-purity sesquialter rare earth metal sulfide single-phase high-entropy ceramic powder is high in purity, simple to prepare, capable of being produced in batches, suitable for color alterants such as pigments and fillers, rich in color, free of toxicity, suitable for high-temperature thermoelectric functional ceramic materials and good in structural stability.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional ceramic materials, and in particular relates to a sesqui-rare earth sulfide high-entropy ceramic material and its preparation method and application. Background technique [0002] Traditional material design is to improve the comprehensive performance by doping specific elements or compounding special functional molecules with single or double component main components. With the advancement of science and technology, increasingly complex and harsh working conditions put forward higher requirements for the comprehensive performance of materials. In order to develop new ceramic materials used under extreme conditions, high-entropy ceramics exhibit excellent comprehensive properties by virtue of high-entropy effects, delayed diffusion effects, lattice distortion effects, and cocktail effects. [0003] High-entropy ceramics generally refer to ceramic materials with a simple crystal ...

Claims

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Application Information

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IPC IPC(8): C04B35/515C04B35/547C04B35/622C04B35/626C04B35/64C04B35/645
CPCC04B35/5156C04B35/547C04B35/622C04B35/645C04B35/64C04B35/62685C04B35/62675C04B2235/3224C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/5436C04B2235/602C04B2235/656C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/66C04B2235/666C04B2235/658C04B2235/9607
Inventor 陈玉奇
Owner SHANGHAI DIANJI UNIV
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