High-entropy boron-containing carbide ultrahigh temperature ceramic powder and preparation method thereof

An ultra-high temperature ceramic and boron carbide technology, which is applied in the field of carbide ceramics, can solve the problems that do not involve the preparation of pure high-entropy boron-containing carbide ultra-high temperature ceramic powder, etc., and achieves optimized design of each component content and short preparation time. , the effect of easy reaction process

Active Publication Date: 2019-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research results have been awarded the national invention patent, the patent number is ZL201710361716.8, but the patent only invented the carbon fiber reinforced high-entropy boron carbide ultra-high temperature ceramic composite material preparation method, and does not involve the preparation of pure high-entropy boron carbide ultra-high temperature ceramic composite materials. Related methods of boron carbide ultra-high temperature ceramic powder

Method used

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  • High-entropy boron-containing carbide ultrahigh temperature ceramic powder and preparation method thereof
  • High-entropy boron-containing carbide ultrahigh temperature ceramic powder and preparation method thereof
  • High-entropy boron-containing carbide ultrahigh temperature ceramic powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] Mill Zr powder, Ti powder, and C powder on a planetary ball mill for 2 hours according to the molar ratio of 0.8:0.2:0.8, wherein the particle size of Zr powder and Ti powder is -300 mesh, and C powder is -4000 mesh, with a purity of ≥99%. The medium is ethanol, the rotation speed is 100rpm, and the ball-to-material ratio is 5:1. After ball milling, it is taken out and dried at 40°C, and the mixed powder is obtained after sieving;

[0041] Place the mixed powder in a graphite mold for pressureless discharge plasma sintering for pressureless discharge plasma sintering. The vacuum degree in the furnace is less than 5Pa, and the temperature is raised to 1500°C for 30 minutes at a heating rate of 100°C / min. Then it is cooled to room temperature and taken out for crushing. The balls are milled into powder in the ball mill, the ball milling time is 0.5h, the ball milling medium is ethanol, the rotation speed is 200rpm, the ball material ratio is 5:1, and the carbide ceramic po...

Embodiment 2

[0045] Mill Zr powder, Ti powder, and C powder on a planetary ball mill for 2 hours according to the molar ratio of 0.8:0.2:0.8, wherein the particle size of Zr powder and Ti powder is -300 mesh, and C powder is -4000 mesh, with a purity of ≥99%. The medium is ethanol, the rotation speed is 100rpm, and the ball-to-material ratio is 5:1. After ball milling, it is taken out and dried at 40°C, and the mixed powder is obtained after sieving;

[0046] Place the mixed powder in a graphite mold for pressureless discharge plasma sintering for pressureless discharge plasma sintering. The vacuum degree in the furnace is less than 5Pa, and the temperature is raised to 1600°C for 15 minutes at a heating rate of 100°C / min. Then it is cooled to room temperature and taken out for crushing. The balls are milled into powder in the ball mill, the ball milling time is 0.5h, the ball milling medium is ethanol, the rotation speed is 200rpm, the ball material ratio is 5:1, and the carbide ceramic po...

Embodiment 3

[0050] Ball mill Zr powder, Ti powder, and C powder on a planetary ball mill for 2 hours according to the molar ratio of 0.8:0.2:0.85, wherein the particle size of Zr powder and Ti powder is -300 mesh, and C powder is -4000 mesh, with a purity of ≥99%. The medium is ethanol, the rotation speed is 100rpm, and the ball-to-material ratio is 5:1. After ball milling, it is taken out and dried at 40°C, and the mixed powder is obtained after sieving;

[0051]Place the mixed powder in a graphite mold for pressureless discharge plasma sintering for pressureless discharge plasma sintering. The vacuum degree in the furnace is less than 5Pa, and the temperature is raised to 1500°C for 30 minutes at a heating rate of 100°C / min. Then it is cooled to room temperature and taken out for crushing. The balls are milled into powder in the ball mill, the ball milling time is 0.5h, the ball milling medium is ethanol, the rotation speed is 200rpm, the ball material ratio is 5:1, and the carbide ceram...

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Abstract

The invention belongs to the technical field of carbide ceramics, and concretely relates to a high-entropy boron-containing carbide ultrahigh temperature ceramic powder and a preparation method thereof. The molecular formula of the ceramic powder is XCyBz, wherein X is at least two of Zr, Ti, Hf, V, Nb, Ta, Cr, Mo and W, y is equal to or more than 0.6 and less 1.0, z is more than 0 and equal to orless than 0.4, and y + z = 1. The ceramic powder has a single phase face-centered cubic structure. The preparation method comprises the following steps: carrying out ball-milling mixing on at least two metal powders and C powder, carrying out pressureless plasma sintering and crushing to obtain carbide powder, mixing the carbide powder with B2O3 powder and a carbon source, and then performing high temperature sintering and crushing to obtain the ceramic powder. The ceramic powder is a single-phase solid solution, has the face-centered cubic structure, and contains the boron element, so the ceramic powder integrates the high temperature resistance of carbides and the oxidation resistance of borides, and can be used to prepare an ablation and oxidation resistant high-entropy boron-containing carbide ultrahigh temperature ceramic block or composite material.

Description

technical field [0001] The invention belongs to the technical field of carbide ceramics, and in particular relates to a high-entropy boron-containing carbide ultra-high temperature ceramic powder and a preparation method thereof. Background technique [0002] Ultra-high temperature ceramics have high melting point, high stability and high oxygen barrier capacity. They are used in nose cones and wing fronts of hypersonic vehicles, throat linings and diffusion sections of rockets and other components. They are important for thermal protection systems of space shuttles and strategic missiles. candidate materials. Commonly used ultra-high temperature ceramics include binary system ceramics such as borides, nitrides and carbides of Zr, Ti, Hf and other elements. However, the oxidation resistance and anti-ablation performance of binary system ultra-high temperature ceramic materials have limitations, such as , ZrC will be oxidized into a loose and porous zirconia layer below 2500...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/65
CPCC04B35/5622C04B35/65C04B2235/3813C04B2235/6562C04B2235/6581
Inventor 曾毅熊翔伦惠林孙威王雅雷陈招科
Owner CENT SOUTH UNIV
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