High-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder and preparation method thereof

A transition metal and ceramic powder technology, applied in the field of superhard ceramic materials, can solve the problems of high oxygen content and residual carbon content of multi-component carbides, poor sphericity, low purity, etc., to enrich the ceramic material system, inhibit the The effect of grain growth and oxygen reduction

Active Publication Date: 2019-10-15
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 of high oxygen content and residual carbon content, low purity, large particle size and poor sphericity in the multi-component carbide high-entropy ceramic material prepared by the existing method, and provide a high-purity ultrafine transition metal carbide Single-phase high-entropy ceramic powder and preparation method thereof

Method used

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  • High-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder and preparation method thereof
  • High-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder and preparation method thereof
  • High-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder and preparation method thereof

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specific Embodiment approach 1

[0032] Specific embodiment one: present embodiment is that the chemical formula of high-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder is (Hf x1 Nb x3 Ta x4 Ti x2 m x5 ) C; said M is Zr, V, Cr, Mo or W; said x1+x2+x3+x4+x5=1.

specific Embodiment approach 2

[0033] Specific embodiment two: this embodiment is a high-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder is completed according to the following steps:

[0034] 1. Weighing:

[0035] ①. Weigh the metal oxide:

[0036] According to the molar ratio of hafnium oxide, niobium oxide, tantalum oxide, titanium oxide and M oxide is (1~4):(1~4):(1~4):(1~4):(1 ~4) Weighing hafnium oxide, niobium oxide, tantalum oxide, titanium oxide and M oxide respectively to obtain metal oxide;

[0037] ②. Calculate the total amount of reducing carbon powder:

[0038]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 hafnium oxide, niobium oxide, tantalum oxide, titanium oxide and M oxide taken in step ①, and then add up to obtain The total amount of reducing carbon powder;

[0039] A in the reaction equation described in step 1. x o...

specific Embodiment approach 3

[0045] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the hafnium oxide described in step one ① is HfO 2 . Other steps are the same as in the second embodiment.

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Abstract

The invention discloses high-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder and a preparation method thereof, belongs to the technical field of super-hard ceramic materials, and particularly relates to the preparation method of the high-entropy ceramic powder. The invention aims to solve the problems of high oxygen content, high residual carbon content, low purity, large particle size and poor sphericity of a multi-component carbide high-entropy ceramic material prepared with the prior method. The chemical formula of the high-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder is (Hfx1Nbx3Tax4Tix2Mx5)C. The method comprises the following steps: 1, weighing materials; 2, mixing; and 3, calcining. The high-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder prepared in the invention has the advantages of small particle size, low oxygen content and low free carbon content. The high-purity ultrafine transition metal carbide single-phase high-entropy ceramic powder can be obtained in the invention.

Description

technical field [0001] The invention belongs to the technical field of superhard ceramic materials, and in particular relates to a method for preparing high-entropy ceramic powder. 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 form. In addition, c-BN and B 4 The toughness of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/56C04B35/626
CPCC04B35/5607C04B35/5611C04B35/5622C04B35/5626C04B35/62645C04B2235/3241C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/661
Inventor 陈磊苏文韬王玉金张文徐晨光周玉
Owner HARBIN INST OF TECH
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