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 suit

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

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

[0024](2) Add a solvent and ball mill, ball mill mixing raw material, dry dry, and sieved to give a mixed uniform powder;

[0025](3) The hydraulic pressure of the mixed powder is hydraulically compact, and then the densified billet is obtained by the calm pressure;

[0026](4) The billet is subjected to high temperature sintering treatment in a vacuum or protective atmosphere to obtain a layered high entropy dual boron carbide block material;

[0027](5) Crushing and grinding the bulk material after high temperature sintering, and finally the layered high entropy boron carbide ceramic powder is obtained.

[0028]Preferably, the metal oxide is selected from the group consisting of cerium oxide (Y2O3), Cerium oxide (CEO2), Cerium oxide (GD2O3), Oxidation (DY2O3), Oxide (ER2O3At least three of them.

[0029]Preferably, the boron sou...

Example Embodiment

[0041]Example 1

[0042](1) Will Y2O3CEO2GD2O3, DY2O3, Er2O3, BN and Carbon Black Mass mole 1: 2: 1: 1: 1: 20: 36 is made;

[0043](2) Mix the proportional powder in anhydrous ethanol, placed in the planetary ball mill (300r / min, the ball mill is 24 h), the ball mill is 24h after the powder is vacuum dry after 80 ° C After 200 mesh sieves, it is obtained from mixed powder;

[0044](3) Place the mixed uniform powder in the stainless steel mold, molded with hydraulic pressing (15 MPa, holding pressure time is 5 min), then the cold and other static pressure is further molded (holding pressure of 220 MPa, pressure pressure) Time is 15 minutes, get the blank;

[0045](4) Place the blank in the graphite crucible, and then placed in the multifunctional sintering furnace, warming up at 10 ° C / min to 2000 ° C, holding the furnace under the argon atmosphere, so that it is cooled to room temperature;

[0046](5) Crushing and grinding the block material after high temperature sintering, and finally prepa...

Example Embodiment

[0048]Example 2

[0049](1) Will Y2O3CEO2GD2O3, DY2O3, Er2O3, B4C and carbon black Mass moon 1: 2: 1: 1: 1: 5: 31 for ingredients;

[0050](2) Mix the matching powder mixed in anhydrous ethanol, placed in the planetary ball mill (the ball mill is 350 r / min, the ball mill is 24h), and the ball after ball mill is dried in vacuo. After 200 mesh sieves, it is obtained from mixed powder;

[0051](3) In the stainless steel mold, the mixed uniform powder is placed in a stainless steel mold (a pressure pressure pressure is 12 MPa, the holding time is 10 min), and then the cooling and other static pressure is further formed (holding pressure of 220 MPa, pressure pressure) Time is 10 min) to get the blank;

[0052](4) Place the blank in the graphite crucible, and then placed in the multifunctional sintering furnace, warming up at 10 ° C / min to 1950 ° C under argon atmosphere, so that it is cooled to room temperature.

[0053](5) Crushing and grinding the block material after high temperature sintering,...

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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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