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High-entropy ceramic powder and preparation method thereof, and high-entropy ceramic block

A technology of ceramic powder and ceramic block, which is applied in the field of high-entropy ceramic powder and its preparation, and high-entropy ceramic block, which can solve the problems of raw material risk, poor quality of finished products, and inability to realize large-scale production, so as to reduce sintering Effects of temperature and grain size

Active Publication Date: 2020-02-28
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there have been new methods for preparing high-entropy ceramics in the past few years, most of them have some disadvantages: such as dangerous raw materials, inability to achieve large-scale production, poor quality of finished products, and inability to form ceramic products of certain specifications. New preparation method of high-entropy ceramics is crucial

Method used

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  • High-entropy ceramic powder and preparation method thereof, and high-entropy ceramic block
  • High-entropy ceramic powder and preparation method thereof, and high-entropy ceramic block
  • High-entropy ceramic powder and preparation method thereof, and high-entropy ceramic block

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preparation example Construction

[0025] The invention provides a preparation method of high-entropy ceramic powder, comprising the following steps:

[0026] La(NO 3 ) 3 , Co(NO 3 ) 2 , Cr(NO 3 ) 3 , Fe(NO 3 ) 3 , Mn(NO 3 ) 2 and Ni(NO 3 ) 2 The mixed solution of the mixed solution is mixed with ammonia water to carry out co-precipitation reaction, and the high-entropy ceramic precursor powder is obtained after solid-liquid separation; the pH value of the co-precipitation reaction is 9-10;

[0027] The high-entropy ceramic precursor powder is subjected to heat treatment to obtain a high-entropy ceramic powder; the temperature of the heat treatment is 1000-1400°C.

[0028] The present invention will La(NO 3 ) 3 , Co(NO 3 ) 2 , Cr(NO 3 ) 3 , Fe(NO 3 ) 3 , Mn(NO 3 ) 2 and Ni(NO 3 ) 2 The mixed solution is mixed with ammonia water for co-precipitation reaction. In the present invention, the molar ratio of La ions, Co ions, Cr ions, Fe ions, Mn ions and Ni ions in the mixed solution is prefe...

Embodiment 1

[0039] La(Co 0.2 Cr 0.2 Fe 0.2 mn 0.2 Ni 0.2 )O 3 The preparation method of high-entropy ceramic powder, the preparation steps are as follows:

[0040] Step 1: Weigh 10.83g La(NO 3 ) 3 , 1.46g Co(NO 3 ) 2 , 2.00g Cr(NO 3 ) 3 , 2.02g Fe(NO 3 ) 3 , 1.26g Mn(NO 3 ) 2 and 1.45gNi(NO 3 ) 2 , the molar ratio of La ions, Co ions, Cr ions, Fe ions, Mn ions and Ni ions is 5:1:1:1:1:1; they are mixed and dissolved in 200mL deionized water to form a mixed solution, The solution was stirred evenly, and the mixed solution was slowly poured into 300mL of ammonia solution (pH value = 9) and kept stirring, while continuously dripping ammonia water to keep the pH of the solution; after the precipitation was complete, the precipitate was filtered and washed with ammonia water, and finally the The precipitation is dried at 100°C to obtain an amorphous precursor powder with uniform composition;

[0041] Step 2: Heat the precursor powder obtained in step 1 at 1000°C for 6 hours t...

Embodiment 2

[0044] Prepare the high-entropy ceramic powder obtained in step 2 of Example 1 into a high-entropy ceramic block: put the high-entropy ceramic powder into a graphite mold, seal the graphite mold, and then place the mold in a discharge plasma furnace Sintering in the medium to obtain La(Co 0.2 Cr 0.2 Fe 0.2 mn 0.2 Ni 0.2 )O 3 High-entropy ceramic blocks;

[0045] Sintering equipment: discharge plasma sintering furnace;

[0046] Heating method: AC pulse current;

[0047] Sintering temperature: 1400°C;

[0048] Sintering time: 5min;

[0049] Heating rate: 50°C / min.

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Abstract

The invention relates to the technical field of high-performance ceramics, in particular to high-entropy ceramic powder and a preparation method thereof, and a high-entropy ceramic block. According tothe invention, the high-entropy ceramic powder and the high-entropy ceramic block are prepared by adopting a coprecipitation method; required experimental equipment is simple; operation is easy; large-scale production is facilitated; the sintering temperature of the high-entropy ceramic can be remarkably reduced; rapid sintering of the ceramic is achieved within a temperature range of 1000-1400 DEG C; and the high-entropy ceramic with a perovskite structure is obtained.

Description

technical field [0001] The invention relates to the technical field of high-performance ceramics, in particular to a high-entropy ceramic powder, a preparation method thereof, and a high-entropy ceramic block. Background technique [0002] In the late 1990s, Professor Ye Junwei of Tsinghua University in Taiwan, China proposed the concept of high entropy, and defined it as element types ≥ 5, no dominant element, and the content of all elements is between 5% and 35%. The high-entropy alloy is an alloy obtained by alloying more than five elemental components according to an equiatomic ratio or close to an equiatomic ratio. High-entropy alloys have excellent properties that some traditional alloys cannot match, such as high strength, high hardness, high wear resistance and corrosion resistance. Typical high-entropy alloys that have been reported include alloys with a face-centered cubic solid solution structure represented by CoCrCuFeNi and alloys with a body-centered cubic sol...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/626C04B35/622
CPCC04B35/50C04B35/626C04B35/6264C04B35/62635C04B35/62675C04B35/622C04B2235/3275C04B2235/3241C04B2235/3262C04B2235/3272C04B2235/3279
Inventor 苗洋杨文静郭猛张丰年高峰
Owner TAIYUAN UNIV OF TECH
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