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Super-hard five-component transition metal carbide single-phase high-entropy ceramic material and preparation method thereof

A technology of transition metals and ceramic materials, applied in the field of superhard ceramic materials, can solve the problems of multi-component carbide oxygen pollution and difficulty in increasing the density, and achieve the advantages of enriching the ceramic material system, avoiding oxygen pollution, and improving strength and hardness. Effect

Active Publication Date: 2019-09-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the existing multi-component carbide preparation method is difficult to avoid oxygen pollution and difficult to increase the density, and to provide a superhard five-component transition metal carbide single-phase high-entropy ceramic material and its preparation method

Method used

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  • Super-hard five-component transition metal carbide single-phase high-entropy ceramic material and preparation method thereof
  • Super-hard five-component transition metal carbide single-phase high-entropy ceramic material and preparation method thereof
  • Super-hard five-component transition metal carbide single-phase high-entropy ceramic material and preparation method thereof

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specific Embodiment approach 1

[0033] Specific embodiment one: the present embodiment is a superhard five-element transition metal carbide single-phase high-entropy ceramic material whose chemical formula is (Ti x1 Zr x2 Nb x3 Ta x4 m x5 ) C; said M is V, Cr, Mo or W; said x1+x2+x3+x4+x5=1.

specific Embodiment approach 2

[0034] Specific embodiment two: This embodiment is a preparation method of a superhard five-component transition metal carbide single-phase high-entropy ceramic material, which is completed according to the following steps:

[0035] 1. Weighing:

[0036] ①. Weigh the metal oxide:

[0037] According to the molar ratio of titanium oxide, zirconium oxide, niobium oxide, tantalum oxide and M oxide is (1~4):(1~4):(1~4):(1~4):(1 ~4) Weighing titanium oxide, zirconium oxide, niobium oxide, tantalum oxide and M oxide respectively to obtain metal oxide;

[0038] ②. Calculate the total amount of reducing carbon powder:

[0039] According to the reaction equation is A x o y +(bx / a+y)C=x / aA a C b + yCO respectively calculate the amount of reducing carbon powder required for the carbonization reaction of titanium oxide, zirconium oxide, niobium oxide, tantalum oxide and M oxide weighed in step ①, and then add up to obtain The total amount of reducing carbon powder;

[0040] A in the ...

specific Embodiment approach 3

[0053] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the titanium oxide described in step one is TiO 2 or Ti 2 o 3 . Other steps are the same as in the second embodiment.

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Abstract

The invention discloses a super-hard five-component transition metal carbide single-phase high-entropy ceramic material and a preparation method thereof, belongs to the technical field of super-hard ceramic materials, and particularly relates to a super-hard single-phase high-entropy ceramic material and a preparation method thereof. In the prior art, the existing multi-component carbide preparation method can cause oxygen pollution, and the density is difficultly increased. A purpose of the present invention is to solve the problems in the prior art. According to the present invention, the super-hard five-component transition metal carbide single-phase high-entropy ceramic material has a chemical formula of (Tix1Zrx2Nbx3Tax4Mx5)C; the preparation method comprises: 1, weighing, 2, mixing,3, calcining, 4, high temperature sintering, and 5, demolding; and with the method, the density and the mechanical properties of the carbide are improved, the significant solid solution strengtheningeffect and the high density significantly improve the hardness of the material, and the super-hard five-component transition metal carbide single-phase high-entropy ceramic material can be obtained.

Description

technical field [0001] The invention belongs to the technical field of superhard ceramic materials, and in particular relates to a superhard single-phase high-entropy ceramic material and a preparation method thereof. Background technique [0002] Superhard materials are widely used in abrasives, cutting tools, wear-resistant coatings, etc. The bulletproof armor ceramics that have been studied in recent years also have high requirements on the hardness of the material. The hardest material known in nature is diamond, but diamond is expensive and difficult to process into complex shapes. Among common ceramic materials, cubic boron nitride (c-BN) has the highest hardness, exceeding 50GPa. Boron carbide (B 4 C) and its composite materials also have high hardness, generally exceeding 30GPa. But c-BN and B 4 C is a strong covalent bond compound, the self-diffusion coefficient is very low during the sintering process, and the material is difficult to sinter and shape. In add...

Claims

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Application Information

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IPC IPC(8): C04B35/56C04B35/622
CPCC04B35/5607C04B35/622C04B2235/3232C04B2235/3239C04B2235/3241C04B2235/3244C04B2235/3251C04B2235/3256C04B2235/3258C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/96
Inventor 陈磊王恺王玉金苏文韬周玉
Owner HARBIN INST OF TECH
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