Method for preparing MAX-phase high-entropy ceramic material

A ceramic material, high-entropy technology, applied in the field of structural ceramic materials, can solve the problems of low hardness and strength, limited application, etc., and achieve the effects of excellent mechanical properties, cost reduction, and flexible operation

Pending Publication Date: 2021-07-30
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with traditional ceramic materials, the hardness (2-6GPa) and strength of MAX phase are lower, which greatly limits its application in engineering practice, so it is necessary to improve its mechanical properties

Method used

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  • Method for preparing MAX-phase high-entropy ceramic material
  • Method for preparing MAX-phase high-entropy ceramic material
  • Method for preparing MAX-phase high-entropy ceramic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Prepare MAX phase high-entropy ceramic materials according to the following steps

[0069] 1) According to the molar ratio of TiH 2 : V: Nb: TiC: VC: NbC: Al = 1: 1: 1: 1: 1: 1: 3.6 to prepare composite powder.

[0070]2) Pour the compound obtained in step 1) into a ball mill jar, add absolute ethanol as a grinding aid, and place it in a planetary ball mill for ball milling and mixing. The mass ratio of absolute ethanol to composite powder is 2:1.

[0071] The grinding balls are agate balls, Φ10-15mm balls account for 80% of the total balls, Φ5-8mm balls account for 20% of the total balls, the ball-to-material ratio is 6:1, and the milling speed is 360rpm / min, ball milling time is 10h.

[0072] Then, place the mixed slurry obtained after ball milling on a porcelain plate, place it in a vacuum drying oven to dry, set the temperature at 65°C, and evacuate it below 0.1MPa, and evacuate it every 2h. After 8h, turn off the heating device , and the sample was taken out af...

Embodiment 2

[0077] The MAX phase high-entropy ceramic material was prepared according to the following steps:

[0078] 1) According to the molar ratio of TiH 2 : V: Nb: Ta: TiC: VC: NbC: TaC: Al = 1: 1: 1: 1: 1: 1: 1: 1: 4.8 to prepare composite powder.

[0079] 2) Pour the composite powder obtained in step 1) into a ball mill jar, add absolute ethanol as a grinding aid, and place it in a planetary ball mill for ball milling and mixing. The mass ratio of absolute ethanol to the composite powder is 2:1.

[0080] The grinding balls are agate balls, Φ10-15mm balls account for 80% of the total balls, Φ5-8mm balls account for 20% of the total balls, the ball-to-material ratio is 6:1, and the milling speed is 360rpm / min, ball milling time is 10h.

[0081] However, the mixed slurry containing 65% solid phase volume fraction obtained after ball milling was placed in a porcelain plate, dried in a vacuum drying oven, the temperature was set at 65°C, and the vacuum was evacuated to below 0.1MPa, ...

Embodiment 3

[0086] The MAX phase high-entropy ceramic material was prepared according to the following steps:

[0087] 1) According to the molar ratio of TiH 2 :V:Nb:Ta:Cr:TiC:VC:NbC:TaC:Cr 3 C 2 : Al=1:1:1:1:0.5:1:1:1:1:1:0.5:6 to prepare composite powder.

[0088] 2) Pour the composite powder obtained in step 1) into a ball mill jar, add absolute ethanol as a grinding aid, and place it in a high-energy ball mill for ball milling and mixing. The mass ratio of absolute ethanol to the composite powder is 2:1.

[0089] The grinding balls are agate balls, Φ10-15mm balls account for 80% of the total balls, Φ5-8mm balls account for 20% of the total balls, the ball-to-material ratio is 6:1, and the milling speed is 360rpm / min, ball milling time is 10h.

[0090] Then, place the mixed slurry containing 65% solid phase volume fraction obtained after ball milling on a porcelain plate, and dry it in a vacuum drying oven. The temperature is set at 65°C, and the vacuum is evacuated to below 0.1MP...

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Abstract

The invention provides a method for preparing an MAX-phase high-entropy ceramic material. The method comprises the following steps: 1) preparing composite powder: mixing transition metal powder, transition metal hydride powder, corresponding transition metal carbide powder and aluminum powder to prepare the composite powder; 2) dispersing the composite powder obtained in the step 1) in a grinding aid, performing ball milling to obtain mixed slurry, performing vacuum drying, and sieving; (3) putting the mixed powder obtained in the step (2) into a steel mold, and carrying out pre-pressing forming to obtain a ceramic blank; and 4) placing the ceramic blank obtained in the step 3) in a graphite mold, and carrying out pressure sintering under a vacuum condition at a loading pressure of 45-55 MPa and a temperature of 1300-1500 DEG C to obtain the MAX-phase high-entropy ceramic. The invention also provides the MAX-phase high-entropy ceramic material prepared by the method, and the MAX-phase high-entropy ceramic material has excellent mechanical properties.

Description

technical field [0001] The invention belongs to the technical field of structural ceramic materials, and more specifically relates to a method for preparing a MAX-phase high-entropy ceramic material with excellent comprehensive mechanical properties, and a MAX-phase high-entropy ceramic material prepared by the method. Background technique [0002] MAX phase ceramics are a class of hexagonal structure ceramics with high aspect ratio and chemical bond anisotropy. It has the advantages of both metal and ceramics, such as low density, high modulus, high damage tolerance, good thermal shock resistance and electrical conductivity, etc. It has broad application prospects and is expected to be used in high-temperature seals and nuclear fuel cladding materials , new brushes and electrodes, etc. However, compared with traditional ceramic materials, the hardness (2-6GPa) and strength of MAX phase are lower, which greatly limits its application in engineering practice, so it is necess...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622C04B35/64C04B35/645
CPCC04B35/5607C04B35/622C04B35/64C04B35/645C04B2235/3217C04B2235/6562C04B2235/6567C04B2235/6581C04B2235/666C04B2235/77C04B2235/96
Inventor 钟志宏刘成友欧阳维吴玉程
Owner HEFEI UNIV OF TECH
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