Preparation method of high-entropy oxide ceramic

A technology of oxide ceramics and oxide powder, which is applied in the field of preparation of high-entropy oxide ceramics, can solve problems such as being unsuitable for the preparation of high-entropy oxide ceramics, and achieve the effects of shortening sintering time and reducing synthesis temperature.

Active Publication Date: 2019-09-06
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the above method is only suitable for the synthesis of high-entropy oxide powders, not for the preparation of high-entropy oxide ceramics

Method used

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  • Preparation method of high-entropy oxide ceramic
  • Preparation method of high-entropy oxide ceramic

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preparation example Construction

[0026] A preparation method of high-entropy oxide ceramics, comprising the following steps:

[0027] Step 1: Weigh 4 or less than 5 metal oxide powders according to the molar ratio of the metal atoms to 1:1:1:1 or 1:1:1:1:1; the oxide powders include: MgO , ZnO, NiO, CuO, CaO, CoO, ZrO 2 , CeO 2 、Al 2 o 3 、Gd 2 o 3 , La 2 o 3 、Er 2 o 3 , Y 2 o 3 , Fe 2 o 3 、Co 3 o 4 , CaCO 3 ;

[0028] Step 2: Ball mill, dry and granulate the powder weighed in step 1;

[0029] Add deionized water to the weighed powder, mix in a planetary ball mill, the speed of the ball mill is 50-180r / min, and the ball milling time is 10-50 h. The obtained slurry is dried, the drying temperature is 100°C, and the holding time is 10-30 h to obtain a uniformly mixed ceramic powder. Add PVA to the dried ceramic powder for granulation, and the concentration of PVA is 3wt%.

[0030] Step 3: Compressing the granulated powder to obtain a green body;

[0031] The granulated powder was molded into...

Embodiment 1

[0038] A preparation method of high-entropy oxide ceramics, comprising the following steps:

[0039] Step 1: Weigh the oxide powder according to the following molar ratio, ZnO: MgO: NiO: CuO: Co 3 o 4 =3:3:3:3:1 Weigh the powder, a total of 21.37 g.

[0040] Step 2: Add 200 mL of deionized water to the weighed powder, mix in a planetary ball mill, the speed of the ball mill is 180 r / min, and the ball milling time is 12 h; dry the obtained slurry at At 98°C for 24 h, uniformly mixed ceramic powder was obtained; the dried ceramic powder was added to PVA for granulation, and the concentration of PVA was 3 wt%.

[0041] Step 3: The granulated powder is molded into a dog-bone sample (to facilitate the connection of the sample to the electrode in the flash furnace); under the condition of a pressure of 200 MPa, hold the pressure for 60 s. The sample was placed in a cold isostatic press for secondary pressure at a pressure of 290 MPa.

[0042] Step 4: heat-treat the green body ob...

Embodiment 2

[0046] A preparation method of high-entropy oxide ceramics, comprising the following steps:

[0047] Step 1: Weigh the oxide powder according to the following molar ratio, ZnO:NiO:CuO:Co 3 o 4 =3:3:3:1 Weigh the powder, a total of 20g.

[0048] Step 2: Add 200 mL of deionized water to the weighed powder, mix in a planetary ball mill, the speed of the ball mill is 180 r / min, and the ball milling time is 12 h; dry the obtained slurry at At 98°C for 24 h, uniformly mixed ceramic powder was obtained; the dried ceramic powder was added to PVA for granulation, and the concentration of PVA was 3 wt%.

[0049] Step 3: The granulated powder is molded into a dog-bone sample (to facilitate the connection of the sample to the electrode in the flash furnace); under the condition of a pressure of 200 MPa, hold the pressure for 60 s. The sample was placed in a cold isostatic press for secondary pressure at a pressure of 290 MPa.

[0050] Step 4: heat-treat the green body obtained in step...

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Abstract

The invention discloses a preparation method of high-entropy oxide ceramic. The method comprises the following steps that 1, according to metal atom mole ratio being 1:1:1:1 or 1:1:1:1:1, four or fiveor less kinds of metal oxide powder are weighed; the oxide powder includes MgO, ZnO, NiO, CuO, CaO, CoO, ZrO2, CeO2, Al2O3, Gd2O3, La2O3, Er2O3, Y2O3, Fe2O3, Co3O4 and CaCO3; 2, powder weighed in step 1 is subjected to ball milling, drying and granulation; 3, granulated powder is pressed and molded to form a green body; 4, the green body obtained in step 3 is subjected to thermal treatment; 5, the green body obtained after thermal treatment in step 4 is heated to the preset temperature, an electric field of the preset electric field intensity is applied to a sample, after flash-burning appears, a power source is converted from the constant voltage state to the constant current state, the temperature is kept constant for 1-60 min under the preset current density, and then quenching is performed to obtain the needed high-entropy oxide ceramic. The flash-burning is adopted for preparing the high-entropy oxide ceramic, the sintering temperature is remarkably lowered, and the sintering time is remarkably shortened.

Description

technical field [0001] The invention relates to the technical field of ceramic material preparation, in particular to a preparation method of high-entropy oxide ceramics. Background technique [0002] High-entropy ceramic materials refer to ceramic materials with a single crystal structure composed of more than three metal elements and one non-metal element. Wherein, the mole percentage of each metal element is basically the same. At present, the reported high-entropy ceramics mainly include high-entropy oxides, high-entropy borides, high-entropy carbides, and high-entropy silicides. High-entropy ceramic materials exhibit unique mechanical, electrical and optical properties due to their high entropy value and large lattice distortion. [0003] The current method of preparing high-entropy oxide ceramics is generally solid-state sintering, in which binary oxide powders are mixed and sintered at high temperature to allow sufficient diffusion and mixing of atoms. However, thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/04C04B35/45C04B35/01C04B35/622C04B35/64
CPCC04B35/01C04B35/04C04B35/45C04B35/453C04B35/622C04B35/64C04B2235/3277C04B2235/6562C04B2235/6567C04B2235/661C04B2235/666
Inventor 刘金铃刘佃光赵科
Owner SOUTHWEST JIAOTONG UNIV
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