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(ZrHfCeTiZn)O2-delta high-entropy oxide ceramic powder and block with fluorite structure and preparation methods

A technology for oxide ceramics and ceramic powders, which is applied in the field of high-performance ceramics, can solve the problems of increasing the surface energy of powders, reducing the sintering temperature of ceramics, and increasing defects, so as to reduce the sintering temperature, have fine grains, and enrich ceramic materials. effect of the system

Active Publication Date: 2019-07-09
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-energy ball milling is related to many factors, including motion frequency, ball-to-material ratio, ball-loading volume ratio, and ball-milling atmosphere, etc., but in the end, the surface energy of the powder increases, the defects increase greatly, and the powder in a metastable state The body greatly reduces the sintering temperature of the ceramic

Method used

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  • (ZrHfCeTiZn)O2-delta high-entropy oxide ceramic powder and block with fluorite structure and preparation methods
  • (ZrHfCeTiZn)O2-delta high-entropy oxide ceramic powder and block with fluorite structure and preparation methods
  • (ZrHfCeTiZn)O2-delta high-entropy oxide ceramic powder and block with fluorite structure and preparation methods

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A fluorite-type structure (ZrHfCeTiZn)O 2 The preparation method of -δ high entropy oxide ceramic powder and block, its specific steps and process parameters are as follows:

[0029] Step 1, preparation of amorphous ceramic powder: weighing five kinds of ZrO powders in equimolar ratio 2 , HfO 2 , CeO 2 、TiO 2 , ZnO, put the powder into an agate ball mill jar, the selected ball-to-material ratio is 12:1, the speed is 500r / min, every 30min of ball milling is intermittent for 10min, and a total of 30h of ball milling is obtained to obtain an amorphous ceramic powder with uniform composition .

[0030] Step 2. Preparation of high-entropy oxide ceramic powder: heat-treat the amorphous ceramic powder obtained in step 1 at 1100°C for 60 minutes to obtain (ZrHfCeTiZn)O 2 -δ crystalline high-entropy oxide ceramic powder.

Embodiment 2

[0032] The amorphous ceramic powder in step 1 in Example 1 is prepared into a high-entropy oxide ceramic block: the amorphous ceramic powder is packed into a graphite mold, and the graphite mold is sealed, and then the mold is placed in a discharge Sintering in a plasma furnace to obtain (ZrHfCeTiZn)O with a fluorite structure 2 - Delta bulk ceramics.

Embodiment 3

[0034] Prepare the crystalline high-entropy oxide ceramic powder obtained in step 2 of Example 1 into a high-entropy oxide ceramic block: put the crystalline high-entropy oxide ceramic powder into a graphite mold, and seal the graphite mold , and then the mold was placed in a discharge plasma furnace for sintering to obtain (ZrHfCeTiZn)O 2 - Delta bulk ceramics.

[0035] The sintering process of described embodiment 2 and embodiment 3 is as follows:

[0036] Sintering equipment: discharge plasma sintering furnace;

[0037] Heating method: AC pulse current;

[0038] Sintering temperature: 1600°C;

[0039]Sintering time: 5min;

[0040] Sintering pressure: 30MPa;

[0041] Heating rate: 50°C / min.

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Abstract

The invention discloses a (ZrHfCeTiZn)O2-delta high-entropy oxide ceramic powder and block and preparation methods, belongs to the technical field of high-performance ceramics, and overcomes the defects of a ceramic sintering technology. The preparation methods comprise the steps of by taking metal elements as references, accurately weighing various oxide powders, and conducting mixing to achievethe stoichiometric composition of a target sample; performing high-energy ball milling in an agate tank, carrying out heat treatment on the obtained amorphous oxide powder at 900-1200 DEG C for 60 minor more, so as to obtain the high-entropy oxide ceramic powder; and placing the amorphous ceramic oxide powder or the high-entropy oxide ceramic powder in a graphite mold, and conducting sintering ina discharge plasma furnace or a hot pressing furnace to obtain the high-entropy oxide ceramic block with the fluorite structure. According to the invention, the problem of preparation of the high-entropy ceramic block and the problems of non-uniform mixing of ceramic powder, high thermal stress and the like are solved, the high-entropy oxide ceramic powder with the fluorite structure and the high-entropy oxide ceramic block with the fluorite structure are finally obtained by strictly controlling the sintering process of the discharge plasma furnace or the hot pressing furnace, and a ceramic material system is enriched.

Description

technical field [0001] The invention belongs to the technical field of high-performance ceramics, in particular to a (ZrHfCeTiZn)O with a fluorite structure. 2 - Delta high-entropy oxide ceramic powder and a preparation method for high-entropy oxide ceramic powder and 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 elements, and the content of all elements between 5% and 35%. A high-entropy alloy is an alloy obtained by alloying more than five metal elements in 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 CoCrC...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626C04B35/64
CPCC04B35/49C04B35/62615C04B35/62675C04B35/64C04B2235/3229C04B2235/3284C04B2235/6562C04B2235/6567C04B2235/666C04B2235/762
Inventor 苗洋李天鹅张丰年高峰
Owner TAIYUAN UNIV OF TECH
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