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Layered high-entropy double-boron carbide ceramic powder and preparation method thereof

A technology of borocarbide and ceramic powder, which is applied in the field of layered high-entropy double boron carbide ceramic powder and its preparation, can solve the problems of high price and unsuitability of metal single substance powder, and achieve low preparation cost and control Reaction process, effect of easy reaction process

Inactive Publication Date: 2021-05-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the relatively high price of metal elemental powder, it is not suitable for YB 2 C 2 Mass Preparation of Equal Double Boron Carbide Ceramics

Method used

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  • Layered high-entropy double-boron carbide ceramic powder and preparation method thereof
  • Layered high-entropy double-boron carbide ceramic powder and preparation method thereof
  • Layered high-entropy double-boron carbide ceramic powder and preparation method thereof

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preparation example Construction

[0022] In a specific embodiment, the preparation method comprises the steps of:

[0023] (1) Take at least three metal oxides, boron source and carbon source in proportion;

[0024] (2) adding solvent and ball milling medium, ball milling mixed raw materials, vacuum drying and sieving to obtain uniformly mixed powder;

[0025] (3) hydraulically compact the uniformly mixed powder, and then obtain a densified green body through cold isostatic pressing;

[0026] (4) Sintering the green body under normal pressure and high temperature under vacuum or protective atmosphere to obtain a layered high-entropy double boron carbide block material;

[0027] (5) Crushing and grinding the bulk material after high-temperature sintering to finally obtain a layered high-entropy double boron carbide ceramic powder.

[0028] Preferably, the metal oxide is selected from yttrium oxide (Y 2 o 3 ), cerium oxide (CeO 2 ), gadolinium oxide (Gd 2 o 3 ), dysprosium oxide (Dy 2 o 3 ), erbium oxid...

Embodiment 1

[0042] (1) put Y 2 o 3 , CeO 2 、Gd 2 o 3 、Dy 2 o 3 、Er 2 o 3 , BN and carbon black are compounded in a molar ratio of 1:2:1:1:1:20:36;

[0043] (2) Mix the proportioned powder in absolute ethanol, place it in a planetary ball mill for ball milling (the speed of the ball mill is 300r / min, and the ball milling time is 24h), and the powder after ball milling is vacuum-dried at 80°C Pass through a 200-mesh sieve to obtain a uniformly mixed powder;

[0044] (3) Put the uniformly mixed powder in a stainless steel mold, and press it with hydraulic pressure (holding pressure is 15MPa, holding time is 5min), and then further formed by cold isostatic pressing (holding pressure is 220MPa, holding time is 5min). Time is 15min), obtain green body;

[0045] (4) Place the green body in a graphite crucible, then place the graphite crucible in a multifunctional sintering furnace, raise the temperature to 2000°C at 10°C / min under an argon atmosphere, keep it warm for 2h, and let it cool...

Embodiment 2

[0049] (1) put Y 2 o 3 , CeO 2 、Gd 2 o 3 、Dy 2 o 3 、Er 2 o 3 , B 4 C and carbon black are prepared in a molar ratio of 1:2:1:1:1:5:31;

[0050] (2) Mix the proportioned powder in absolute ethanol, place it in a planetary ball mill for ball milling (the speed of the ball mill is 350r / min, and the ball milling time is 24h), and the powder after ball milling is vacuum-dried at 80°C Pass through a 200-mesh sieve to obtain a uniformly mixed powder;

[0051] (3) Put the uniformly mixed powder in a stainless steel mold, press it with hydraulic pressure (holding pressure is 12MPa, holding time is 10min), and then further form it by cold isostatic pressing (holding pressure is 220MPa, holding time is 10min). time is 10 min) to obtain the green body;

[0052] (4) Place the green body in a graphite crucible, then place the graphite crucible in a multifunctional sintering furnace, raise the temperature to 1950°C at 10°C / min under an argon atmosphere, keep it warm for 3h, and al...

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Abstract

The invention relates to the technical field of high-entropy ceramic materials, in particular to layered high-entropy double-boron carbide ceramic powder and a preparation method thereof. The chemical formula of layered high-entropy double-boron carbide in the layered high-entropy double-boron carbide ceramic powder is REB2C2, wherein RE is at least three different elements selected from Y, Ce, Gd, Dy and Er, and the molar ratio of each of the elements is 1. The preparation method comprises the following steps: ball-milling and mixing at least three metal oxides, a boron source and a carbon source, compacting the uniformly mixed powder to obtain a densified green body, sintering the green body at high temperature to obtain a layered high-entropy double-boron carbide block material, and finally, carrying out crushing and grinding to obtain the layered high-entropy double-boron carbide powder. The single-phase high-entropy double-boron carbide ceramic powder with uniform components can be synthesized by taking the metal oxides as raw materials and adopting a carbon / boron thermal reduction method; and the method is simple in preparation process, easy to control the reaction process, free of impurity introduction, low in product preparation cost and suitable for batch production.

Description

technical field [0001] The invention relates to the technical field of high-entropy ceramic materials, in particular to a layered high-entropy double boron carbide ceramic powder and a preparation method thereof. Background technique [0002] Double boron carbide REB 2 C 2 (RE=Sc, Y, lanthanides and actinides) ceramics have a typical lamellar structure. At present, the research on double boron carbide ceramics mainly focuses on the YB 2 C 2 The study of ceramics. YB 2 C 2 Ceramics have excellent properties such as high melting point, high strength, and good chemical stability, and have broad application prospects in ultra-high temperature and other fields. [0003] High-entropy ceramics are a nearly equimolar multicomponent single-phase solid solution ceramic material. High-entropy ceramics exhibit a unique "high-entropy effect" and excellent mechanical, electrical, and thermal properties, making them have broad demand prospects. At present, high-entropy ceramics ...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/58C04B35/626
CPCC04B35/5156C04B35/56C04B35/5805C04B35/6265C04B2235/3225C04B2235/3229C04B2235/3224C04B2235/425C04B2235/424C04B2235/3821C04B2235/386
Inventor 孙国勋王伟礼孙晓宁
Owner SHANDONG UNIV
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