High-entropy ceramic as well as preparation method and application thereof

A high-entropy, ceramic technology, applied in the field of ceramic materials, can solve problems such as performance improvement, lattice distortion, and slippage difficulties, and achieve the effects of large sintering driving force, high phonon scattering, and avoiding pollution.

Pending Publication Date: 2021-05-25
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, since various atoms are randomly distributed in the lattice lattice, the surrounding environment and occupancy of each atom are different, so that there are more lattice distortions and defects inside the lattice, making it difficult to slip and improve performance.
Most of the high-entropy ceramics with 4 or 5 elements have been reported in the literature, and high-entropy ceramics with 6 or more elements are rarely reported

Method used

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  • High-entropy ceramic as well as preparation method and application thereof
  • High-entropy ceramic as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]HFO2(99% powder purity, 1 μm in particle diameter), MOO3(99% purity of powder, 3 μm particle diameter), Zro2(Powder purity 99.8%, particle size 1μm), NB2O5(The purity of powder is 99.8%, particle size 5μm), TiO2(99% purity of powder, 0.5 μm particle size), V2O5(Powder purity 99.6%, particle size 1μm) and B4C (the purity of the powder is 99.9%, particle size 0.5 μm), toner (powder purity 99%, particle size 0.8 μm) is a raw material, with ethanol as a solvent, with Si4N3For the ball milling medium, mixed 24 h on the ball mill, and the mixed powder was obtained.

[0034]2. Put the blank after the mixed powder is placed in the graphite crucible, and the rate of 10 ° C / min is warmed to 1600 ° C for 1 h, and the vacuum heat treatment is obtained (HF1 / 6Mo1 / 6ZR1 / 6NB1 / 6Ti1 / 6V1 / 6) B2High entropy powder.

[0035]3. Will (HF1 / 6Mo1 / 6ZR1 / 6NB1 / 6Ti1 / 6V1 / 6) B2The high entropy powder is placed in a graphite mold, and the discharge plasma is tapered at a rate of 150 ° C / min at a rate of 150 ° C / ...

Embodiment 2

[0039]HFO2(99% powder purity, 1 μm in particle diameter), MOO3(99% purity of powder, 3 μm particle diameter), Zro2(Powder purity 99.8%, particle size 1μm), NB2O5(The purity of powder is 99.8%, particle size 5μm), TiO2(99% purity powder, 0.5 μm particle diameter), WO3(Powder purity 99.5%, particle size 4μm) and B4C (the purity of the powder is 99.9%, particle size 0.5 μm), toner (powder purity 99%, particle size 0.8 μm) is a raw material, with ethanol as a solvent, with Si4N3For the ball milling medium, mixed 24 h on the ball mill, and the mixed powder was obtained.

[0040]2. Put the blank after mixed powder into the graphite crucible, temperature rise to 1400 ° C for 1 h at a rate of 15 ° C / min, and the vacuum heat treatment is obtained (HF1 / 6Mo1 / 6ZR1 / 6NB1 / 6Ti1 / 6W1 / 6) B2High entropy powder.

[0041]3. Will (HF1 / 6Mo1 / 6ZR1 / 6NB1 / 6Ti1 / 6W1 / 6) B2The high entropy powder is placed in a graphite mold, and the discharge plasma sintering is raised to 1400 ° C with a rate of 200 ° C / min and char...

Embodiment 3

[0044]HFO2(99% powder purity, 1 μm in particle diameter), MOO3(99% purity of powder, 3 μm particle diameter), Zro2(Powder purity 99.8%, particle size 1μm), NB2O5(The purity of powder is 99.8%, particle size 5μm), TiO2(The purity of powder is 99%, particle size 0.5 μm), Cr2O3(Powder purity 99.5%, particle diameter 3μm) and B4C (the purity of the powder is 99.9%, particle size 0.5 μm), toner (powder purity 99%, particle size 0.8 μm) is a raw material, with ethanol as a solvent, with Si4N3For the ball milling medium, mixed 24 h on the ball mill, and the mixed powder was obtained.

[0045]2. Put the blank after the mixed powder molded into the graphite crucible, temperature rise to 1500 ° C for 2 h at the rate of 5 ° C / min, and the vacuum heat treatment is obtained (HF1 / 6Mo1 / 6ZR1 / 6NB1 / 6Ti1 / 6CR1 / 6) B2High entropy powder.

[0046]3. Will (HF1 / 6Mo1 / 6ZR1 / 6NB1 / 6Ti1 / 6CR1 / 6) B2The high entropy powder is placed in a graphite mold, and the discharge plasma is tapered by a rate of 300 ° C / min to 12...

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Abstract

The invention belongs to the technical field of ceramic materials, and discloses high-entropy ceramic as well as a preparation method and application thereof. The molecular formula of the high-entropy ceramic is (Me1aMe2bMe3cMe4dMe5eMe6fMe7gMe8h)B2, 0.1</=a</=0.9, 0.1</=b</=0.9, 0.1</=c</=0.9, 0.1</=d</=0.9, 0.1</=e</=0.9, 0.1</=f</= 0.9, 0</=g</=0.9, 0</=h</=0.9, and a+b+c+d+e+f+g+h=1; Me1-Me8 are any 6-8 of Hf, Mo, Zr, Nb, Ti, V, W, Cr and Ta; the high-entropy ceramic is prepared by the following steps of adding any 6-8 of metal oxides HfO2, MoO3, ZrO2, Nb2O5, TiO2, V2O5, WO3, Cr2O3 and Ta2O5, B4C and carbon powder into a solvent, carrying out ball milling and mixing to obtain mixed powder, carrying out compression molding to obtain a blank, heating the blank to 1400-1600 DEG C, heating the obtained high-entropy powder to 1000-1400 DEG C by adopting spark plasma sintering, filling a protective atmosphere, then heating to 1900-2100 DEG C, pressurizing to 10-100 MPa, and calcining to obtain the high-entropy ceramic. The relative density of the high-entropy ceramic is greater than 98%, the hardness is 35-40 GPa, and the thermal conductivity is 0.1-1 W/(mK).

Description

Technical field[0001]The invention belongs to the technical field of ceramic materials, and more particularly to a high entropy ceramic and a preparation method thereof.Background technique[0002]"High entropy" is a new material design theory, which has emerged in recent years. It has become a hot spot in the field of material research, and its concept is initially developed by high entropy alloy. High entropy ceramics are an inorganic non-metallic material, typically a single phase ceramic material that is combined with a combination of more than four or more equivalents or a plurality of non-metallic elements.[0003]High entropy ceramics have high strength, hardness, excellent wear resistance, excellent high temperature strength, good structural stability and good corrosion resistance and oxidation resistance. Due to the increase in components, the combined space for exploring and discovering the new material is greatly increased, but most components do not form a uniform single pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/58
CPCC04B35/58064C04B2235/3244C04B2235/3256C04B2235/3251C04B2235/3232C04B2235/3239C04B2235/3258C04B2235/3241C04B2235/3821C04B2235/422C04B2235/666C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607
Inventor 郭伟明许亮张岩张威林华泰
Owner GUANGDONG UNIV OF TECH
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