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Dispersion-strengthened high-entropy dodecaboride-based composite material and preparation method thereof

A composite material and dispersion strengthening technology, which is applied in the field of dispersion strengthened high-entropy dodecaboride-based composite materials and its preparation, can solve the problems of insufficient hardness of high-entropy ceramics, achieve the solution of insufficient hardness, and realize the improvement of material hardness and hardness value Effect

Active Publication Date: 2022-04-05
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a dispersion-strengthened high-entropy dodecaboride-based composite material and its preparation method. By adding Hf element to the system, the hardness value of the material system can be greatly improved, which solves the problem of the prior art. The Problem of Insufficient Hardness of High Entropy Ceramics

Method used

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  • Dispersion-strengthened high-entropy dodecaboride-based composite material and preparation method thereof
  • Dispersion-strengthened high-entropy dodecaboride-based composite material and preparation method thereof
  • Dispersion-strengthened high-entropy dodecaboride-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation composition is 90% (Dy 1 / 6 Ho 1 / 6 Er 1 / 6 T m 1 / 6 Lu 1 / 6 f 1 / 6 )B 12 with 10% HfB 2 The composite material comprises the following steps:

[0023] (1) Choose Dy with a purity ≥ 99% 2 o 3 、Ho 2 o 3 、Er 2 o 3 、Tm 2 o 3 、Lu 2 o 3 , HfO 2 Metal oxides and amorphous boron powder with a purity ≥ 95% are used as raw materials. The particle size of the raw materials is ≥ 60 mesh, and the proportion (molar ratio) is Dy 2 o 3 :Ho 2 o 3 :Er 2 o 3 :Tm 2 o 3 :Lu 2 o 3 :HfO 2 :B=3:3:3:3:3:10:384, that is, the boron excess is 10%. The raw materials were mixed according to the above ratio and placed in a ball mill tank, with ethanol as solvent, ZrO 2 The ball is a grinding bead, which is mixed for 24 hours at a speed of 120 revs / min on a ball pot grinder to obtain a uniform mixed solution;

[0024] (2) Pour the mixed solution obtained in step (1) into a flask, evaporate to dryness through a rotary evaporator, and grind the powder with a mort...

Embodiment 2

[0029] The preparation composition is 90% (Dy 0.18 Ho 0.18 Er 0.18 T m 0.18 Lu 0.18 f 0.1 )B 12 with 10% HfB 2 Composite materials, including the following steps:

[0030] (1) Choose Dy with a purity ≥ 99% 2 o 3 、Ho 2 o 3 、Er 2 o 3 、Tm 2 o 3 、Lu 2 o 3 , HfO 2 Metal oxides and amorphous boron powder with a purity ≥ 95% are used as raw materials. The particle size of the raw materials is ≥ 60 mesh, and the proportion (molar ratio) is Dy 2 o 3 :Ho 2 o 3 :Er 2 o 3 :Tm 2 o 3 :Lu 2 o 3 :HfO 2 :B=81:81:81:81:81:190:12100, that is, 10% excess boron. The raw materials were mixed according to the above ratio and placed in a ball mill tank, with ethanol as solvent, ZrO 2 The ball is a grinding bead, which is mixed for 24 hours at a speed of 120 revs / min on a ball tank grinder to obtain a uniform mixed solution;

[0031] (2) Pour the mixed solution obtained in step (1) into a flask, evaporate to dryness through a rotary evaporator, and pass the gained sample ...

Embodiment 3

[0036] The preparation composition is 90% (Dy 0.16 Ho 0.16 Er 0.16 T m 0.16 Lu 0.16 f 0.2 )B 12 with 10% HfB 2 Composite materials, including the following steps:

[0037] (1) Choose Dy with a purity ≥ 99% 2 o 3 、Ho 2 o 3 、Er 2 o 3 、Tm 2 o 3 、Lu 2 o 3 , HfO 2 and other metal oxides and amorphous boron powder with a purity ≥ 95% are used as raw materials, and the particle size of the raw materials is ≥ 60 mesh, and the proportion (molar ratio) is Dy 2 o 3 :Ho 2 o 3 :Er 2 o 3 :Tm 2 o 3 :Lu 2 o 3 :HfO 2 :B=18:18:18:18:18:70:3025, that is, 10% excess boron. The raw materials are mixed according to the above ratio and placed in a ball mill tank, with ethanol as a solvent, ZrO 2 The balls are grinding beads, which are mixed for 24 hours at a speed of 120 rpm on a ball tank grinder to obtain a uniform mixed solution;

[0038] (2) Pour the mixed solution obtained in step (1) into a flask, evaporate to dryness through a rotary evaporator, and pass the gain...

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Abstract

The invention relates to a dispersion-strengthened high-entropy dodecaboride-based composite material and a preparation method thereof. The dispersion-strengthened high-entropy dodecaboride-based composite material is prepared from high-entropy ceramic and hafnium diboride. The Hf element is added into the system, so that the hardness value of the material system is greatly improved, and the problem of insufficient hardness of high-entropy ceramic in the prior art is solved.

Description

technical field [0001] The invention belongs to the field of superhard materials, in particular to a dispersion-strengthened high-entropy dodecaboride-based composite material and a preparation method thereof. Background technique [0002] Superhard materials are widely used in industry, but traditional superhard materials such as diamond have problems such as high price, poor thermal stability, poor corrosion resistance, and easy reaction with iron group metals; another example is cubic boron nitride, which also exists High cost, difficult synthesis and other problems. Therefore, people have been working on finding new superhard materials. ErB 12 , DyB1 2 、HoB 12 In a series of rare earth metal dodecaborides, it is a very potential superhard material due to the cubic octahedral cage composed of B atoms. Zheng Xingwei et al. (Patent Publication No.: CN112778010A) successfully synthesized a stable rare earth dodecaboride high-entropy ceramic. Due to the lattice distortio...

Claims

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Application Information

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IPC IPC(8): C04B35/58C04B35/622
Inventor 崔建郑兴伟梁拥成张国军刘吉轩蔡小芝
Owner DONGHUA UNIV
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